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Data last updated: Oct 23, 2026, 5:45 PM ETLatest filing: Oct 22, 2026Now: Oct 24, 2026, 5:02 AM ET

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Brook Byers

Named as an officer, director or promoter on SEC Form D filings · CA, MA · Aug 18, 2009 → Mar 24, 2025

22deals (issuers)
$3Breported sold
644investors
58Form D filings
2009–2025years on file
Follow this personLook further ↓PDF

Data last updated Oct 23, 2026, 5:45 PM ET · Courts (RECAP) last checked: Oct 24, 2026, 2:19 AM ET · SEC enforcement last checked: covered by the index scan as of Oct 24, 2026, 2:50 AM ET

The short version

Brook Byers is listed as an executive officer and director on 58 SEC Form D filings by 22 issuers between Aug 2009 and Mar 2025. Largest by amount reported sold: GRAIL, Inc. (Menlo Park, CA — biotechnology — 2017–2018; $1.21B reported sold to 59 investors), KPCB Digital Growth Fund, LLC (Menlo Park, CA — pooled investment fund — 2010–2011; $932.3M reported sold to 158 investors), Arsenal Biosciences, Inc. (South San Francisco, CA — biotechnology — 2022–2024; $325.4M reported sold to 26 investors), PACIFIC BIOSCIENCES OF CALIFORNIA, INC. (Menlo Park, CA — other technology — 2013; $85M reported sold to 165 investors), Enjoy Technology, Inc. (Menlo Park, CA — other technology — 2014–2019; $75M reported sold to 12 investors) and 17 more (all listed below).

What this means That is a lot of deals — 22 separate companies raised money with this person listed as executive officer and director, over about 16 years. Across those companies the filings report $3B sold in total.

Listed alongside Fred Cohen (12 shared filings), William Hagstrom (12 shared filings), Alain D. Baron (6 shared filings), Beth Seidenberg (6 shared filings), Brian Atwood (6 shared filings) and 160 others.

What this means These are the other officers, directors or promoters the companies named on the same forms — the team around Brook. Each name links to their own page.

4 of the issuers belong to the sponsor group Kleiner Perkins Caufield (10 issuers, $932.3M reported sold, 2010–2019).

What this means A sponsor group is one team that sets up a new company for each deal. Kleiner Perkins Caufield has 10 companies on file and $932.3M reported sold in total — the group page shows the whole track record in one place.

Public records searched: federal courts (CourtListener / RECAP), SEC enforcement releases, state securities regulators (AZ, CA, DE, TX, WA) — none found.

What this means Nothing turned up where we looked (3 sources). That does not prove there is nothing — it means none was found in those sources on that date.

We compared the newest 50 of 58 public filings for Brook Byers and found 12 differences, 2 worth asking the sponsor about: 12 Form Ds were filed more than 15 days after the first sale; Brook Byers is no longer listed on the Jun 17, 2016 amendment; and more below.

What this means These are differences between the sponsor's own SEC filings — both values, dates and sources are listed in Key records, section 4. Most have ordinary explanations; ask the sponsor.

What the community is saying

Community search for Brook Byers has not run yet — it is joining a line of 4,931 names; searches run around the clock at the hosts' allowed rate. Searched so far: 27 names.

Community comments are quoted as written by their authors. Sources searched: BiggerPockets forums (via DuckDuckGo, Brave, Bing and BiggerPockets search) and Reddit (search feed + public archive).

Key records

Five things investors ask first. Items still in human review are counted, not shown.

1. Lawsuits

None found in sources searched — federal courts (CourtListener / RECAP), checked Oct 24, 2026

What was searched

Sources searched: CourtListener bulk data (RECAP dockets as of 2026-09-30; recall-first rule 10-24) — federal district + bankruptcy courts State courts: not covered (one-tap state court links under Look further). PACER: not searched. · Last checked Oct 24, 2026, 2:19 AM ET.

State courts: not covered (one-tap state court links under Look further). No state offers a lawful automated statewide source PartnerFacts can use today. Texas (re:SearchTX) terms prohibit storing results in a database open to third parties; New York (WebCivil) and Massachusetts (MassCourts) require a browser check that blocks scripted queries; California has no statewide index (58 county portals; Rule of Court 2.503 grants name-based access case by case); Florida, Utah and Illinois offer paid or partial access whose terms for automated use are unverified. Washington (dw.courts.wa.gov; bulk index reports under a JISC data-dissemination agreement), Delaware (CourtConnect; Court of Chancery not included) and Arizona (apps.azcourts.gov/publicaccess, which has an official channel to request high-volume access) are the candidates; PartnerFacts will request written permission before any automated search. Federal courts are searched through CourtListener / RECAP.

2. Regulatory actions

None found in sources searched — SEC enforcement releases (index scan as of Oct 24, 2026, 2:50 AM ET) · state securities regulators: AZ, CA, DE, TX, WA (crawled Oct 23, 2026)

What was searched

SEC enforcement searched: SEC litigation releases and administrative proceedings — respondent names in the sec.gov index titles (30,205 releases, 1995-09-19 to 2026-10-23); release text is read only to confirm a candidate. Names that appear only in the body of a release are not found. — Searched SEC litigation releases and administrative proceedings (1995→ / 2007→) (30,205 records as of Oct 24, 2026, 2:50 AM ET) — nothing matched Brook Byers..

State securities regulators searched: AZ (Corporation Commission Securities Division), CA (DFPI — 16 of 12,159 DFPI respondent pages read so far; sponsor-name matches are read first), DE (DOJ Investor Protection Unit), TX (State Securities Board), WA (DFI) — last crawled Oct 23, 2026, 9:57 PM ET. Other states are not covered.

3. Bankruptcies

None found in sources searched — federal bankruptcy courts (CourtListener / RECAP), checked Oct 24, 2026

What was searched

Sources searched: Federal bankruptcy courts via CourtListener / RECAP archive (federal district courts, federal bankruptcy courts). State courts: not covered (one-tap state court links under Look further). PACER: not searched (RECAP only). · Last checked Oct 24, 2026, 2:19 AM ET.

State courts: not covered (one-tap state court links under Look further). No state offers a lawful automated statewide source PartnerFacts can use today. Texas (re:SearchTX) terms prohibit storing results in a database open to third parties; New York (WebCivil) and Massachusetts (MassCourts) require a browser check that blocks scripted queries; California has no statewide index (58 county portals; Rule of Court 2.503 grants name-based access case by case); Florida, Utah and Illinois offer paid or partial access whose terms for automated use are unverified. Washington (dw.courts.wa.gov; bulk index reports under a JISC data-dissemination agreement), Delaware (CourtConnect; Court of Chancery not included) and Arizona (apps.azcourts.gov/publicaccess, which has an official channel to request high-volume access) are the candidates; PartnerFacts will request written permission before any automated search. Federal courts are searched through CourtListener / RECAP.

4. Differences between public sources

Comparisons cover issuers and sponsor groups — see the issuer pages under Deals

12 differences found between the filings for Brook Byers — 2 worth asking about (compared the newest 50 of 58 filings on Oct 24, 2026; older filings not covered)

Worth asking · Aug 3, 2010 – Mar 24, 2025

12 Form Ds were filed more than 15 days after the first sale

Form D filed 324 days after the first sale — Octave Bioscience Inc · Form D filed 211 days after the first sale — Arsenal Biosciences, Inc. · Form D filed 634 days after the first sale — Arsenal Biosciences, Inc. · Form D filed 70 days after the first sale — Octave Bioscience Inc · Form D filed 288 days after the first sale — Epiodyne, Inc. · and 7 more

What this means Late notices are common and carry no penalty by themselves. A pattern of late paperwork is worth asking the sponsor about.

Form D · Nov 24, 2023 ↗Octave Bioscience Inc — PartnerFacts page ↗Form D · Sep 9, 2022 ↗Arsenal Biosciences, Inc. — PartnerFacts page ↗
Sources
Worth asking · Apr 28, 2016 – Jun 17, 2016

Brook Byers is no longer listed on the Jun 17, 2016 amendment — CareDx, Inc.

Brook Byers appears on the Apr 28, 2016 Form D (director) but not on the Jun 17, 2016 Form D/A for the same offering.

What this means People leave, and the issuer must list only current officers, directors and promoters. It is still worth asking why this person left and who replaced them.

Form D · Apr 28, 2016 ↗Form D/A · Jun 17, 2016 ↗Brook Byers — PartnerFacts page ↗CareDx, Inc. — PartnerFacts page ↗
Sources
Note · Feb 26, 2013 – Feb 21, 2014

Brook Byers's role changed at Elcelyx Therapeutics, Inc.: executive officer, director → director

The Feb 26, 2013 filing lists Brook Byers as executive officer, director; the Feb 21, 2014 Form D/A lists director.

What this means Roles on Form D are self-reported by the issuer. A change can mean a real change in who runs the company, or just a different box ticked. Ask who makes decisions today.

Form D · Feb 26, 2013 ↗Form D/A · Feb 21, 2014 ↗Brook Byers — PartnerFacts page ↗Elcelyx Therapeutics, Inc. — PartnerFacts page ↗
Sources
Note · May 10, 2011 – Aug 13, 2012

Brook Byers's role changed at Elcelyx Therapeutics, Inc.: director → executive officer, director

The May 10, 2011 filing lists Brook Byers as director; the Aug 13, 2012 Form D/A lists executive officer, director.

What this means Roles on Form D are self-reported by the issuer. A change can mean a real change in who runs the company, or just a different box ticked. Ask who makes decisions today.

Form D/A · May 10, 2011 ↗Form D/A · Aug 13, 2012 ↗Brook Byers — PartnerFacts page ↗Elcelyx Therapeutics, Inc. — PartnerFacts page ↗
Sources
Note · Nov 16, 2010 – Feb 21, 2014

7 offerings changed their target amount between filings

Offering amount changed between filings — Elcelyx Therapeutics, Inc. · Offering amount changed between filings — Oculeve, Inc. · Offering amount changed between filings — Foundation Medicine, Inc. · Offering amount changed between filings — Elcelyx Therapeutics, Inc. · Offering amount changed between filings — Elcelyx Therapeutics, Inc. · and 2 more

What this means Targets change as deals grow or shrink. Ask whether later money has the same terms.

Form D (earlier) · Feb 26, 2013 ↗Form D/A (later) · Feb 21, 2014 ↗Elcelyx Therapeutics, Inc. — PartnerFacts page ↗Form D (earlier) · Oct 30, 2012 ↗
Sources
Note · Jun 29, 2010 – Mar 24, 2025

17 offerings have no amendment in the last 12 months and may still be open

No amendment in the last 12 months on an offering that may still be open — Octave Bioscience Inc (latest filing Mar 24, 2025) · No amendment in the last 12 months on an offering that may still be open — Octave Bioscience Inc (latest filing Nov 24, 2023) · No amendment in the last 12 months on an offering that may still be open — Arsenal Biosciences, Inc. (latest filing Sep 9, 2022) · No amendment in the last 12 months on an offering that may still be open — Enjoy Technology, Inc. (latest filing May 15, 2019) · No amendment in the last 12 months on an offering that may still be open — GRAIL, Inc. (latest filing May 25, 2018) · and 12 more

What this means SEC rules expect a yearly amendment while an offering is still going. Ask the sponsor which of these raises have closed.

Form D · Mar 24, 2025 ↗Octave Bioscience Inc — PartnerFacts page ↗Form D · Nov 24, 2023 ↗Form D · Sep 9, 2022 ↗
Sources
Note · Jul 12, 2010 – Oct 21, 2010

Brook Byers is written 2 different ways on the filings

listed as "Brook Byers" on 42 filings (from Jul 12, 2010), and "Brook H. Byers" on 8 filings (from Oct 21, 2010).

What this means Same person, written differently — a middle name or suffix left off, or spelled another way. It is normal, but check that the full legal name matches your subscription documents.

Form D · Jul 12, 2010 ↗Form D · Oct 21, 2010 ↗Brook Byers — PartnerFacts page ↗
Sources
Note · Oct 7, 2015

Same name, different state: "Brook Byers" (NY) is a separate record

This page covers filings where the address state is CA or MA. A separate record, "Brook Byers" with address state NY, is listed on 1 filing — most recently by Newsela, Inc. (Oct 7, 2015). Both records have filings in the same period (Oct 7, 2015).

What this means Two records with one name were active at the same time. That can be one person listing different company addresses, or two different people. We keep them apart until a filing ties them together. Check both pages before you decide.

Brook Byers (NY) — PartnerFacts page ↗Form D · Oct 7, 2015 ↗Newsela, Inc. — PartnerFacts page ↗Brook Byers (CA,MA) — this page ↗
Sources
Note · Aug 31, 2012 – Jul 24, 2014

Address moved from Palo Alto, CA to Redwood City, CA — CARDIODX INC

The people listed on the Aug 31, 2012 filing give Palo Alto, CA; on the Jul 24, 2014 filing they give Redwood City, CA.

What this means Businesses move; this just shows the two places and dates. If you were told one city and the forms say another, ask which is current.

Form D · Aug 31, 2012 ↗Form D · Jul 24, 2014 ↗CARDIODX INC — PartnerFacts page ↗
Sources
Note · Oct 30, 2012 – Mar 20, 2013

Address moved from San Francisco, CA to South San Francisco, CA — Oculeve, Inc.

The people listed on the Oct 30, 2012 filing give San Francisco, CA; on the Mar 20, 2013 filing they give South San Francisco, CA.

What this means Businesses move; this just shows the two places and dates. If you were told one city and the forms say another, ask which is current.

Form D · Oct 30, 2012 ↗Form D/A · Mar 20, 2013 ↗Oculeve, Inc. — PartnerFacts page ↗
Sources
Note · Sep 16, 2010 – Apr 20, 2012

Address moved from San Francisco, CA to South San Francisco, CA — FIVE PRIME THERAPEUTICS INC

The people listed on the Sep 16, 2010 filing give San Francisco, CA; on the Apr 20, 2012 filing they give South San Francisco, CA.

What this means Businesses move; this just shows the two places and dates. If you were told one city and the forms say another, ask which is current.

Form D · Sep 16, 2010 ↗Form D · Apr 20, 2012 ↗FIVE PRIME THERAPEUTICS INC — PartnerFacts page ↗
Sources
Note · Jul 12, 2010 – Mar 24, 2025

Brook Byers is listed with 2 different address states: CA, MA

CA on 48 filings (Jul 12, 2010 to Mar 24, 2025); MA on 2 filings (Sep 21, 2012 to Jan 10, 2013).

What this means The address on a Form D is usually the company's, not the person's home, so this often just reflects different companies. It can also mean a move. Nothing wrong by itself.

Form D · Jul 12, 2010 ↗Form D · Sep 21, 2012 ↗
Sources
What is compared

What is compared: every Form D and D/A we hold for this subject, side by side — filing dates vs. first-sale dates (the 15-day rule), amendment timing on open offerings (the yearly-amendment expectation), amounts sold, investor counts, offering amounts and minimums across amendments, industry and size bands, addresses, how each person's name and role is written, paid sellers' CRD numbers, and (for groups) where the member companies were formed and sit. Everything is as filed by the issuer; the SEC does not check it. Differences are common and usually have ordinary explanations — we show both values, the dates, and the source so you can ask. We compared the newest 50 of 58 filings (work cap); older filings are not covered here. As of Oct 24, 2026.

5. Money to insiders

3 of 47 offerings report sales commissions totalling $7,073,558; 2 report finder's fees totalling $1,191,137; 4 report proceeds to related persons totalling $5,462,507. (includes amounts the issuer reported as estimates)

Offering (latest filing)Sales commissionsFinder's feesTo insidersPaid to sell itSource
Mar 24, 2025 D
Octave Bioscience Inc
File 021-541925
$0$0$0None listed on this filingEDGAR ↗
Sep 4, 2024 D
Arsenal Biosciences, Inc.
File 021-523129
$0$0$0None listed on this filingEDGAR ↗
Nov 24, 2023 D
Octave Bioscience Inc
File 021-498049
$0$0$0None listed on this filingEDGAR ↗
Nov 24, 2023 D
Octave Bioscience Inc
File 021-498050
$0$0$0None listed on this filingEDGAR ↗
Sep 9, 2022 D
Arsenal Biosciences, Inc.
File 021-458444
$0$0$0None listed on this filingEDGAR ↗
Sep 9, 2022 D
Arsenal Biosciences, Inc.
File 021-458499
$0$0$0None listed on this filingEDGAR ↗
Jan 7, 2021 D
Octave Bioscience Inc
File 021-385495
$0$0$0None listed on this filingEDGAR ↗
May 15, 2019 D
Enjoy Technology, Inc.
File 021-339616
$3,750,000 (est.)$0$0Goldman Sachs & Co. LLC BrokerCheck CRD 361 ↗EDGAR ↗
Apr 24, 2019 D
Epiodyne, Inc.
File 021-337965
$0$0$0None listed on this filingEDGAR ↗
May 25, 2018 D
GRAIL, Inc.
File 021-313322
$0$0$0None listed on this filingEDGAR ↗
Jan 11, 2018 D/A
GRAIL, Inc.
File 021-282443
$2,241,721 (est.)$0$0Goldman, Sachs & Co. BrokerCheck CRD 361 ↗
ABG, LLC BrokerCheck CRD 167190 ↗		EDGAR ↗
Nov 15, 2017 D
Epiodyne, Inc.
File 021-298744
$0$0$0None listed on this filingEDGAR ↗
Sep 13, 2017 D
Octave Bioscience Inc
File 021-294605
$0$0$0None listed on this filingEDGAR ↗
Jun 17, 2016 D
Cell Design Labs, Inc.
File 021-265295
$0$0$0 (est.)None listed on this filingEDGAR ↗
Jun 17, 2016 D
Cell Design Labs, Inc.
File 021-265322
$0$0$0 (est.)None listed on this filingEDGAR ↗
Apr 28, 2016 D
CareDx, Inc.
File 021-262245
$1,081,837$11,737$0Leerink Partners LLC BrokerCheck CRD 39011 ↗
Brookline Capital Markets BrokerCheck CRD 153587 ↗
M.M. Dillon & Co. Group BrokerCheck CRD 19878 ↗		EDGAR ↗
Aug 10, 2015 D
Zephyr Health, Inc.
File 021-245356
$0$0$0None listed on this filingEDGAR ↗
Aug 4, 2015 D
Enjoy Technology, Inc.
File 021-245081
$0$0$0None listed on this filingEDGAR ↗
Feb 19, 2015 D
Elcelyx Therapeutics, Inc.
File 021-234296
$0$0$1,260,000 (est.)
Estimated salary to named executive officers for calendar year 2015.
None listed on this filingEDGAR ↗
Oct 29, 2014 D
Enjoy Technology, Inc.
File 021-227268
$0$0$0None listed on this filingEDGAR ↗
Sep 30, 2014 D
VERACYTE, INC.
File 021-225555
$0$0$0None listed on this filingEDGAR ↗
Jul 24, 2014 D
CARDIODX INC
File 021-221679
$0$0$0 (est.)
Proceeds will be used for general corporate purposes.
None listed on this filingEDGAR ↗
Mar 18, 2014 D
Oculeve, Inc.
File 021-213802
$0$0$0None listed on this filingEDGAR ↗
Feb 21, 2014 D/A
Elcelyx Therapeutics, Inc.
File 021-192402
$0$0$0None listed on this filingEDGAR ↗
Mar 20, 2013 D/A
Oculeve, Inc.
File 021-186287
$0$0$0None listed on this filingEDGAR ↗
Feb 11, 2013 D
PACIFIC BIOSCIENCES OF CALIFORNIA, INC.
File 021-191627
$0$0$0None listed on this filingEDGAR ↗
Jan 10, 2013 D/A
Foundation Medicine, Inc.
File 021-184482
$0 (est.)$0 (est.)$0 (est.)None listed on this filingEDGAR ↗
Jan 2, 2013 D
Crescendo Bioscience, Inc.
File 021-189231
$0$1,179,400$0 (est.)William J. Kridel BrokerCheck CRD 704171 ↗
via FERGHANA SECURITIES, INC. (CRD 43430 ↗)

E. Hunterson Herie BrokerCheck CRD 2431896 ↗
via FERGHANA SECURITIES, INC. (CRD 43430 ↗)

A. Rawle Michelson BrokerCheck CRD 1507251 ↗
via FERGHANA SECURITIES, INC. (CRD 43430 ↗)
EDGAR ↗
Dec 20, 2012 D/A
Elcelyx Therapeutics, Inc.
File 021-154368
$0$0$0None listed on this filingEDGAR ↗
Nov 27, 2012 D
OptiMedica Corp
File 021-187468
$0$0$0None listed on this filingEDGAR ↗
Aug 31, 2012 D
CARDIODX INC
File 021-183494
$0$0$0 (est.)
Proceeds will be used for general corporate purposes including, but not limited to, executive salaries.
None listed on this filingEDGAR ↗
Apr 20, 2012 D
FIVE PRIME THERAPEUTICS INC
File 021-177000
$0$0$0None listed on this filingEDGAR ↗
Nov 15, 2011 D
CareDx, Inc.
File 021-168716
$0$0$0None listed on this filingEDGAR ↗
Nov 3, 2011 D
KPCB China Fund II, L.P.
File 021-168180
$0$0$0None listed on this filingEDGAR ↗
Sep 20, 2011 D
Crescendo Bioscience, Inc.
File 021-166104
$0$0$0 (est.)None listed on this filingEDGAR ↗
Jun 20, 2011 D
Crescendo Bioscience, Inc.
File 021-161480
$0$0$0 (est.)None listed on this filingEDGAR ↗
Mar 11, 2011 D/A
KPCB Digital Growth Fund, LLC
File 021-150610
$0$0$0None listed on this filingEDGAR ↗
Mar 2, 2011 D
CARDIODX INC
File 021-156088
$0$0$2,279,507 (est.)
This estimate excludes amounts paid and that may be paid to the law firm which two executive officers were/are affiliated.
None listed on this filingEDGAR ↗
Nov 16, 2010 D
Kleiner Perkins Caufield & Byers XIV, LLC
File 021-150608
$0$0$0None listed on this filingEDGAR ↗
Oct 21, 2010 D
KPCB sFund, LLC
File 021-149416
$0$0$0None listed on this filingEDGAR ↗
Sep 16, 2010 D
FIVE PRIME THERAPEUTICS INC
File 021-147844
$0$0$0None listed on this filingEDGAR ↗
Jul 12, 2010 D
CareDx, Inc.
File 021-144770
$0$0$0None listed on this filingEDGAR ↗
Jul 7, 2010 D/A
Crescendo Bioscience, Inc.
File 021-77621
$0$0$1,200,000 (est.)
This estimate excludes amounts paid and that may be paid to the law firms with which one of the executive officers was or is affiliated.
None listed on this filingEDGAR ↗
Jun 18, 2010 D
VERACYTE, INC.
File 021-143695
$0$0$0None listed on this filingEDGAR ↗
May 14, 2010 D
CARDIODX INC
File 021-142039
$0$0$723,000 (est.)
This estimate excludes amounts paid and that may be paid to the law firm which two executive officers were/are affiliated and also excludes amounts previously received from the issuance of convertible promissory notes that were converted in the financing.
None listed on this filingEDGAR ↗
Oct 13, 2009 D/A
OptiMedica Corp
File 021-77391
$0$0$0 (est.)
Customary working capital purposes
None listed on this filingEDGAR ↗
Sep 25, 2009 D
HX DIAGNOSTICS INC
File 021-126495
$0$0$0None listed on this filingEDGAR ↗
How this is counted

Counts come from Form D Items 12–15 on the filings in our index (latest filing per offering; one offering = one SEC file number; an amendment updates its offering rather than adding one). "To insiders" = gross proceeds used for payments to executive officers, directors or promoters. "—" = not reported on that filing. Amounts marked (est.) were reported as estimates. "Paid to sell it" = sales compensation recipients named on that filing (Item 12), each linked to FINRA BrokerCheck when a CRD number is reported.

Counted across every filing this person is listed on (latest filing per offering, per issuer).

Deals 22

Every issuer that named Brook Byers on a Form D, newest first. A Form D is the notice a company files after it starts selling a private investment.

OB
Other Health Care

Octave Bioscience Inc

Menlo Park, CA · Sep 13, 2017 → Mar 24, 2025 · 5 filings
  • Mar 24, 2025 · D · $31,840,355 sold of $53,674,121 · 20 investors · min. No minimum reported · role: Director EDGAR ↗
  • Nov 24, 2023 · D · $6,999,999 sold of $6,999,999 · 2 investors · min. No minimum reported · role: Director EDGAR ↗
  • Nov 24, 2023 · D · $32,500,070 sold of $37,505,524 · 20 investors · min. No minimum reported · role: Director EDGAR ↗
  • Jan 7, 2021 · D · $32,000,000 sold of $32,000,000 · 14 investors · min. No minimum reported · role: Director EDGAR ↗
  • Sep 13, 2017 · D · $2,500,000 sold of $2,500,000 · 7 investors · min. No minimum reported · role: Director EDGAR ↗

Raised $32.5M from 20 investors (61% of the $53.7M target) as of the latest filing. Brook is listed as director on 5 filings for this deal.

Latest filing on EDGAR ↗
Sources

Every row is a Form D or D/A on which the issuer listed this name as a related person. Amount sold and investors are the maximum reported on any filing for this issuer. "Similar" = offerings in the same industry claiming the same exemption, filed in the last 5 years: Other Health Care / 506(b) (4,189 filings); ranges are the middle half (25th–75th percentile). Computed by PartnerFacts from SEC EDGAR Form D data as of Oct 23, 2026, 5:45 PM ET. Rows without a range: fewer than 30 comparable filings, or not a Rule 506 offering. No ranking or score.

AB
Biotechnology

Arsenal Biosciences, Inc.

South San Francisco, CA · Sep 9, 2022 → Sep 4, 2024 · 3 filings
  • Sep 4, 2024 · D · $325,352,578 sold of $325,352,578 · 26 investors · min. No minimum reported · role: Director EDGAR ↗
  • Sep 9, 2022 · D · $220,806,682 sold of $230,806,614 · 17 investors · min. No minimum reported · role: Director EDGAR ↗
  • Sep 9, 2022 · D · $32,999,954 sold of $32,999,954 · 9 investors · min. No minimum reported · role: Director EDGAR ↗

Raised $325.4M from 26 investors (100% of the $325.4M target) as of the latest filing. Brook is listed as director on 3 filings for this deal.

Latest filing on EDGAR ↗
Sources

Every row is a Form D or D/A on which the issuer listed this name as a related person. Amount sold and investors are the maximum reported on any filing for this issuer. "Similar" = offerings in the same industry claiming the same exemption, filed in the last 5 years: Biotechnology / 506(b) (3,253 filings); ranges are the middle half (25th–75th percentile). Computed by PartnerFacts from SEC EDGAR Form D data as of Oct 23, 2026, 5:45 PM ET. Rows without a range: fewer than 30 comparable filings, or not a Rule 506 offering. No ranking or score.

ET
Other Technology

Enjoy Technology, Inc.

Menlo Park, CA · Oct 29, 2014 → May 15, 2019 · 3 filings
  • May 15, 2019 · D · $74,999,996 sold of $149,999,996 · 1 investors · min. No minimum reported · role: Director EDGAR ↗
  • Aug 4, 2015 · D · $49,999,999 sold of $49,999,999 · 12 investors · min. No minimum reported · role: Director EDGAR ↗
  • Oct 29, 2014 · D · $26,499,996 sold of $26,499,996 · 8 investors · min. No minimum reported · role: Director EDGAR ↗

Raised $75M from 12 investors (50% of the $150M target) as of the latest filing. Brook is listed as director on 3 filings for this deal.

Latest filing on EDGAR ↗
Sources

Every row is a Form D or D/A on which the issuer listed this name as a related person. Amount sold and investors are the maximum reported on any filing for this issuer. "Similar" = offerings in the same industry claiming the same exemption, filed in the last 5 years: Other Technology / 506(b) (17,390 filings); ranges are the middle half (25th–75th percentile). Computed by PartnerFacts from SEC EDGAR Form D data as of Oct 23, 2026, 5:45 PM ET. Rows without a range: fewer than 30 comparable filings, or not a Rule 506 offering. No ranking or score.

E
Biotechnology

Epiodyne, Inc.

San Francisco, CA · Nov 15, 2017 → Apr 24, 2019 · 2 filings
  • Apr 24, 2019 · D · $7,999,997 sold of $7,999,997 · 13 investors · min. No minimum reported · role: Director EDGAR ↗
  • Nov 15, 2017 · D · $5,780,340 sold of $10,090,340 · 3 investors · min. No minimum reported · role: Director EDGAR ↗

Raised $8M from 13 investors (100% of the $8M target) as of the latest filing. Brook is listed as director on 2 filings for this deal.

Latest filing on EDGAR ↗
Sources

Every row is a Form D or D/A on which the issuer listed this name as a related person. Amount sold and investors are the maximum reported on any filing for this issuer. "Similar" = offerings in the same industry claiming the same exemption, filed in the last 5 years: Biotechnology / 506(b) (3,253 filings); ranges are the middle half (25th–75th percentile). Computed by PartnerFacts from SEC EDGAR Form D data as of Oct 23, 2026, 5:45 PM ET. Rows without a range: fewer than 30 comparable filings, or not a Rule 506 offering. No ranking or score.

G
Biotechnology

GRAIL, Inc.

Menlo Park, CA · Apr 26, 2017 → May 25, 2018 · 4 filings
  • May 25, 2018 · D · $300,000,000 sold of Indefinite · 14 investors · min. No minimum reported · role: Director EDGAR ↗
  • Jan 11, 2018 · D/A · $1,214,655,040 sold of Indefinite · 59 investors · min. No minimum reported · role: Director EDGAR ↗
  • Nov 22, 2017 · D/A · $1,211,655,039 sold of Indefinite · 58 investors · min. No minimum reported · role: Director EDGAR ↗
  • Apr 26, 2017 · D/A · $973,248,965 sold of Indefinite · 47 investors · min. No minimum reported · role: Director EDGAR ↗

Raised $1.21B from 59 investors as of the latest filing. Brook is listed as director on 4 filings for this deal.

Latest filing on EDGAR ↗
Sources

Every row is a Form D or D/A on which the issuer listed this name as a related person. Amount sold and investors are the maximum reported on any filing for this issuer. "Similar" = offerings in the same industry claiming the same exemption, filed in the last 5 years: Biotechnology / 506(b) (3,253 filings); ranges are the middle half (25th–75th percentile). Computed by PartnerFacts from SEC EDGAR Form D data as of Oct 23, 2026, 5:45 PM ET. Rows without a range: fewer than 30 comparable filings, or not a Rule 506 offering. No ranking or score.

CD
Biotechnology

Cell Design Labs, Inc.

Lafayette, CA · Jun 17, 2016 → Jun 17, 2016 · 2 filings
  • Jun 17, 2016 · D · $4,000,000 sold of $4,000,000 · 1 investors · min. No minimum reported · role: Director EDGAR ↗
  • Jun 17, 2016 · D · $22,890,007 sold of $22,890,007 · 15 investors · min. No minimum reported · role: Director EDGAR ↗

Raised $22.9M from 15 investors (100% of the $4M target) as of the latest filing. Brook is listed as director on 2 filings for this deal.

Latest filing on EDGAR ↗
Sources

Every row is a Form D or D/A on which the issuer listed this name as a related person. Amount sold and investors are the maximum reported on any filing for this issuer. "Similar" = offerings in the same industry claiming the same exemption, filed in the last 5 years: Biotechnology / 506(b) (3,253 filings); ranges are the middle half (25th–75th percentile). Computed by PartnerFacts from SEC EDGAR Form D data as of Oct 23, 2026, 5:45 PM ET. Rows without a range: fewer than 30 comparable filings, or not a Rule 506 offering. No ranking or score.

C
Biotechnology

CareDx, Inc.

Brisbane, CA · Jul 12, 2010 → Apr 28, 2016 · 3 filings
  • Apr 28, 2016 · D · $14,169,129 sold of $36,802,008 · 39 investors · min. No minimum reported · role: Director EDGAR ↗
  • Nov 15, 2011 · D · $2,155,781 sold of $2,928,943 · 31 investors · min. $1 · role: Director EDGAR ↗
  • Jul 12, 2010 · D · $6,041,511 sold of $10,000,000 · 48 investors · min. $1 · role: Director EDGAR ↗

Raised $22.2M from 48 investors (60% of the $36.8M target) as of the latest filing. Brook is listed as director on 3 filings for this deal.

Latest filing on EDGAR ↗
Sources

Every row is a Form D or D/A on which the issuer listed this name as a related person. Amount sold and investors are the maximum reported on any filing for this issuer. "Similar" = offerings in the same industry claiming the same exemption, filed in the last 5 years: Biotechnology / 506(b) (3,253 filings); ranges are the middle half (25th–75th percentile). Computed by PartnerFacts from SEC EDGAR Form D data as of Oct 23, 2026, 5:45 PM ET. Rows without a range: fewer than 30 comparable filings, or not a Rule 506 offering. No ranking or score.

ZH
Other Health Care

Zephyr Health, Inc.

San Francisco, CA · Aug 10, 2015
  • Aug 10, 2015 · D · $17,477,051 sold of $19,999,995 · 12 investors · min. No minimum reported · role: Director EDGAR ↗

Raised $17.5M from 12 investors (87% of the $20M target) as of the latest filing. Brook is listed as director.

Latest filing on EDGAR ↗
Sources

Every row is a Form D or D/A on which the issuer listed this name as a related person. Amount sold and investors are the maximum reported on any filing for this issuer. "Similar" = offerings in the same industry claiming the same exemption, filed in the last 5 years: Other Health Care / 506(b) (4,189 filings); ranges are the middle half (25th–75th percentile). Computed by PartnerFacts from SEC EDGAR Form D data as of Oct 23, 2026, 5:45 PM ET. Rows without a range: fewer than 30 comparable filings, or not a Rule 506 offering. No ranking or score.

ET
Biotechnology

Elcelyx Therapeutics, Inc.

San Diego, CA · May 10, 2011 → Feb 19, 2015 · 6 filings
  • Feb 19, 2015 · D · $5,823,326 sold of $9,000,000 · 8 investors · min. No minimum reported · role: Director EDGAR ↗
  • Feb 21, 2014 · D/A · $24,720,101 sold of $24,720,101 · 7 investors · min. No minimum reported · role: Director EDGAR ↗
  • Feb 26, 2013 · D · $12,000,002 sold of $20,000,006 · 7 investors · min. No minimum reported · role: Executive Officer, Director EDGAR ↗
  • Dec 20, 2012 · D/A · $21,125,008 sold of $21,125,008 · 7 investors · min. No minimum reported · role: Executive Officer, Director EDGAR ↗
  • Aug 13, 2012 · D/A · $18,125,014 sold of $18,125,014 · 7 investors · min. No minimum reported · role: Executive Officer, Director EDGAR ↗
  • May 10, 2011 · D/A · $14,125,007 sold of $14,125,007 · 7 investors · min. No minimum reported · role: Director EDGAR ↗

Raised $24.7M from 13 investors (100% of the $9M target) as of the latest filing. Brook is listed as director, executive officer on 6 filings for this deal.

Latest filing on EDGAR ↗
Sources

Every row is a Form D or D/A on which the issuer listed this name as a related person. Amount sold and investors are the maximum reported on any filing for this issuer. "Similar" = offerings in the same industry claiming the same exemption, filed in the last 5 years: Biotechnology / 506(b) (3,253 filings); ranges are the middle half (25th–75th percentile). Computed by PartnerFacts from SEC EDGAR Form D data as of Oct 23, 2026, 5:45 PM ET. Rows without a range: fewer than 30 comparable filings, or not a Rule 506 offering. No ranking or score.

V
Other Health Care

VERACYTE, INC.

South San Francisco, CA · Jun 18, 2010 → Sep 30, 2014 · 2 filings
  • Sep 30, 2014 · D · $12,797,283 sold of $12,797,283 · 6 investors · min. No minimum reported · role: Director EDGAR ↗
  • Jun 18, 2010 · D · $9,311,668 sold of $28,435,000 · 9 investors · min. No minimum reported · role: Director EDGAR ↗

Raised $12.8M from 9 investors (100% of the $12.8M target) as of the latest filing. Brook is listed as director on 2 filings for this deal.

Latest filing on EDGAR ↗
Sources

Every row is a Form D or D/A on which the issuer listed this name as a related person. Amount sold and investors are the maximum reported on any filing for this issuer. "Similar" = offerings in the same industry claiming the same exemption, filed in the last 5 years: Other Health Care / 506(b) (4,189 filings); ranges are the middle half (25th–75th percentile). Computed by PartnerFacts from SEC EDGAR Form D data as of Oct 23, 2026, 5:45 PM ET. Rows without a range: fewer than 30 comparable filings, or not a Rule 506 offering. No ranking or score.

C
Biotechnology

CARDIODX INC

Redwood City, CA · May 14, 2010 → Jul 24, 2014 · 4 filings
  • Jul 24, 2014 · D · $20,983,348 sold of $24,999,996 · 14 investors · min. No minimum reported · role: Director EDGAR ↗
  • Aug 31, 2012 · D · $30,509,397 sold of $58,018,795 · 28 investors · min. No minimum reported · role: Director EDGAR ↗
  • Mar 2, 2011 · D · $57,491,448 sold of $78,325,737 · 17 investors · min. No minimum reported · role: Director EDGAR ↗
  • May 14, 2010 · D · $34,564,513 sold of $44,536,736 · 16 investors · min. No minimum reported · role: Director EDGAR ↗

Raised $57.5M from 28 investors (100% of the $25M target) as of the latest filing. Brook is listed as director on 4 filings for this deal.

Latest filing on EDGAR ↗
Sources

Every row is a Form D or D/A on which the issuer listed this name as a related person. Amount sold and investors are the maximum reported on any filing for this issuer. "Similar" = offerings in the same industry claiming the same exemption, filed in the last 5 years: Biotechnology / 506(c) (163 filings); ranges are the middle half (25th–75th percentile). Computed by PartnerFacts from SEC EDGAR Form D data as of Oct 23, 2026, 5:45 PM ET. Rows without a range: fewer than 30 comparable filings, or not a Rule 506 offering. No ranking or score.

O
Other Health Care

Oculeve, Inc.

South San Francisco, CA · Oct 30, 2012 → Mar 18, 2014 · 3 filings
  • Mar 18, 2014 · D · $16,649,997 sold of $16,649,997 · 8 investors · min. $1 · role: Director EDGAR ↗
  • Mar 20, 2013 · D/A · $7,590,476 sold of $7,592,976 · 9 investors · min. No minimum reported · role: Director EDGAR ↗
  • Oct 30, 2012 · D · $7,565,476 sold of $7,565,476 · 8 investors · min. No minimum reported · role: Director EDGAR ↗

Raised $16.6M from 9 investors (100% of the $16.6M target) as of the latest filing. Brook is listed as director on 3 filings for this deal.

Latest filing on EDGAR ↗
Sources

Every row is a Form D or D/A on which the issuer listed this name as a related person. Amount sold and investors are the maximum reported on any filing for this issuer. "Similar" = offerings in the same industry claiming the same exemption, filed in the last 5 years: Other Health Care / 506(b) (4,189 filings); ranges are the middle half (25th–75th percentile). Computed by PartnerFacts from SEC EDGAR Form D data as of Oct 23, 2026, 5:45 PM ET. Rows without a range: fewer than 30 comparable filings, or not a Rule 506 offering. No ranking or score.

PB
Other Technology

PACIFIC BIOSCIENCES OF CALIFORNIA, INC.

Menlo Park, CA · Feb 11, 2013
  • Feb 11, 2013 · D · $20,500,000 sold of $20,500,000 · 4 investors · min. No minimum reported · role: Director EDGAR ↗

Raised $85M from 165 investors (100% of the $20.5M target) as of the latest filing. Brook is listed as director.

Latest filing on EDGAR ↗
Sources

Every row is a Form D or D/A on which the issuer listed this name as a related person. Amount sold and investors are the maximum reported on any filing for this issuer.

FM
Biotechnology

Foundation Medicine, Inc.

Cambridge, MA · Sep 21, 2012 → Jan 10, 2013 · 2 filings
  • Jan 10, 2013 · D/A · $55,962,423 sold of $55,962,423 · 22 investors · min. No minimum reported · role: Director EDGAR ↗
  • Sep 21, 2012 · D · $42,499,987 sold of $42,499,987 · 19 investors · min. No minimum reported · role: Director EDGAR ↗

Raised $56M from 22 investors (100% of the $56M target) as of the latest filing. Brook is listed as director on 2 filings for this deal.

Latest filing on EDGAR ↗
Sources

Every row is a Form D or D/A on which the issuer listed this name as a related person. Amount sold and investors are the maximum reported on any filing for this issuer.

CB
Biotechnology

Crescendo Bioscience, Inc.

South San Francisco, CA · Nov 20, 2009 → Jan 2, 2013 · 6 filings
  • Jan 2, 2013 · D · $28,454,396 sold of $28,454,396 · 9 investors · min. No minimum reported · role: Director EDGAR ↗
  • Sep 20, 2011 · D · $25,000,000 sold of $25,000,000 · 1 investors · min. No minimum reported · role: Director EDGAR ↗
  • Jun 20, 2011 · D · $31,019,775 sold of $40,000,000 · 10 investors · min. No minimum reported · role: Director EDGAR ↗
  • Jul 7, 2010 · D/A · $37,600,003 sold of $42,600,004 · 4 investors · min. No minimum reported · role: Director EDGAR ↗
  • Dec 23, 2009 · D/A · $27,600,001 sold of $27,600,001 · 4 investors · min. No minimum reported · role: Director EDGAR ↗
  • Nov 20, 2009 · D/A · $20,099,999 sold of $20,099,999 · 4 investors · min. No minimum reported · role: Director EDGAR ↗

Raised $37.6M from 10 investors (100% of the $28.5M target) as of the latest filing. Brook is listed as director on 6 filings for this deal.

Latest filing on EDGAR ↗
Sources

Every row is a Form D or D/A on which the issuer listed this name as a related person. Amount sold and investors are the maximum reported on any filing for this issuer.

OC
Other Health Care

OptiMedica Corp

Sunnyvale, CA · Aug 18, 2009 → Nov 27, 2012 · 3 filings
  • Nov 27, 2012 · D · $35,000,001 sold of $35,000,001 · 14 investors · min. No minimum reported · role: Director EDGAR ↗
  • Oct 13, 2009 · D/A · $30,235,886 sold of $35,035,000 · 22 investors · min. No minimum reported · role: Director EDGAR ↗
  • Aug 18, 2009 · D · $25,035,000 sold of $35,035,000 · 17 investors · min. No minimum reported · role: Director EDGAR ↗

Raised $35M from 22 investors (100% of the $35M target) as of the latest filing. Brook is listed as director on 3 filings for this deal.

Latest filing on EDGAR ↗
Sources

Every row is a Form D or D/A on which the issuer listed this name as a related person. Amount sold and investors are the maximum reported on any filing for this issuer.

FP
Biotechnology

FIVE PRIME THERAPEUTICS INC

South San Francisco, CA · Sep 16, 2010 → Apr 20, 2012 · 2 filings
  • Apr 20, 2012 · D · $10,000,000 sold of $10,000,000 · 1 investors · min. No minimum reported · role: Director EDGAR ↗
  • Sep 16, 2010 · D · $7,499,999 sold of $7,499,999 · 1 investors · min. No minimum reported · role: Director EDGAR ↗

Raised $21M from 1 investor (100% of the $10M target) as of the latest filing. Brook is listed as director on 2 filings for this deal.

Latest filing on EDGAR ↗
Sources

Every row is a Form D or D/A on which the issuer listed this name as a related person. Amount sold and investors are the maximum reported on any filing for this issuer.

KC
Pooled Investment Fund · group: Kleiner Perkins Caufield

KPCB China Fund II, L.P.

Pudong, Shanghai, China (as filed: F4) · Nov 3, 2011
  • Nov 3, 2011 · D · $0 sold of $250,000,000 · 0 investors · min. No minimum reported · role: Director EDGAR ↗

No sales reported yet as of the latest filing. Brook is listed as director.

Latest filing on EDGAR ↗
Sources

Every row is a Form D or D/A on which the issuer listed this name as a related person. Amount sold and investors are the maximum reported on any filing for this issuer.

KD
Pooled Investment Fund · group: Kleiner Perkins Caufield

KPCB Digital Growth Fund, LLC

Menlo Park, CA · Nov 16, 2010 → Mar 11, 2011 · 2 filings
  • Mar 11, 2011 · D/A · $932,326,251 sold of $1,000,000,000 · 158 investors · min. No minimum reported · role: Executive Officer (Managing Member) EDGAR ↗
  • Nov 16, 2010 · D · $0 sold of $750,000,000 · 0 investors · min. No minimum reported · role: Executive Officer (Managing Member) EDGAR ↗

Raised $932.3M from 158 investors (93% of the $1B target) as of the latest filing. Brook is listed as executive officer on 2 filings for this deal.

Latest filing on EDGAR ↗
Sources

Every row is a Form D or D/A on which the issuer listed this name as a related person. Amount sold and investors are the maximum reported on any filing for this issuer.

KP
Pooled Investment Fund · group: Kleiner Perkins Caufield

Kleiner Perkins Caufield & Byers XIV, LLC

Menlo Park, CA · Nov 16, 2010
  • Nov 16, 2010 · D · $0 sold of $650,000,000 · 0 investors · min. No minimum reported · role: Executive Officer (Managing Member) EDGAR ↗

No sales reported yet as of the latest filing. Brook is listed as executive officer.

Latest filing on EDGAR ↗
Sources

Every row is a Form D or D/A on which the issuer listed this name as a related person. Amount sold and investors are the maximum reported on any filing for this issuer.

KS
Pooled Investment Fund · group: Kleiner Perkins Caufield

KPCB sFund, LLC

Menlo Park, CA · Oct 21, 2010
  • Oct 21, 2010 · D · $0 sold of $50,000,000 · 0 investors · min. No minimum reported · role: Executive Officer (Managing Member) EDGAR ↗

No sales reported yet as of the latest filing. Brook is listed as executive officer.

Latest filing on EDGAR ↗
Sources

Every row is a Form D or D/A on which the issuer listed this name as a related person. Amount sold and investors are the maximum reported on any filing for this issuer.

HD
Other Health Care

HX DIAGNOSTICS INC

Danville, CA · Sep 25, 2009
  • Sep 25, 2009 · D · $4,650,674 sold of $4,650,674 · 2 investors · min. No minimum reported · role: Director EDGAR ↗

Raised $4.65M from 2 investors (100% of the $4.65M target) as of the latest filing. Brook is listed as director.

Latest filing on EDGAR ↗
Sources

Every row is a Form D or D/A on which the issuer listed this name as a related person. Amount sold and investors are the maximum reported on any filing for this issuer.

Other pages with the same name (1)

Separate person records under the same name, not combined with this page. Each line says whether it shares an issuer with this record.

  • Brook Byers — NY, 1 issuer, Oct 7, 2015 → Oct 7, 2015 · no shared issuer

People around Brook 40

Officers, directors, promoters and management entities named on the same filings, as of Oct 23, 2026, 5:45 PM ET. Showing the 40 with the most shared filings.

FC
No photo found yet (own website and image search run after this page is viewed)
Person

Fred Cohen

Director, Executive Officer, Promoter · 12 shared filings (5 issuers) · also on 19 other issuers

Fred Cohen is on 24 issuers in total — a repeat sponsor. Their page lists every one.

WH
No photo found yet (own website and image search run after this page is viewed)
Person

William Hagstrom

Executive Officer, Director · 12 shared filings (3 issuers) · also on 1 other issuer

Listed on the same filings as Brook Byers. Their page shows their other deals.

BS
No photo found yet (own website and image search run after this page is viewed)
Person

Beth Seidenberg

Director · 6 shared filings (3 issuers) · also on 26 other issuers

Beth Seidenberg is on 29 issuers in total — a repeat sponsor. Their page lists every one.

JG
No photo found yet (own website and image search run after this page is viewed)
Person

Jim Glasheen

Director · 6 shared filings (1 issuer) · also on 3 other issuers

Listed on the same filings as Brook Byers. Their page shows their other deals.

MP
No photo found yet (own website and image search run after this page is viewed)
Person

Michael Pellini

Executive Officer, Director · 6 shared filings (2 issuers) · also on 4 other issuers

Michael Pellini is on 6 issuers in total — a repeat sponsor. Their page lists every one.

BA
No photo found yet (own website and image search run after this page is viewed)
Person

Brian Atwood

Director, Executive Officer, Promoter · 6 shared filings (3 issuers) · also on 12 other issuers

Brian Atwood is on 15 issuers in total — a repeat sponsor. Their page lists every one.

MB
No photo found yet (own website and image search run after this page is viewed)
Person

Mark Blumenkranz

Director · 6 shared filings (2 issuers) · also on 1 other issuer

Listed on the same filings as Brook Byers. Their page shows their other deals.

DL
No photo found yet (own website and image search run after this page is viewed)
Person

David Levison

Executive Officer, Director · 6 shared filings (2 issuers) · also on 1 other issuer

Listed on the same filings as Brook Byers. Their page shows their other deals.

JO
No photo found yet (own website and image search run after this page is viewed)
Person

Jack Oliver

Director · 6 shared filings (1 issuer) · also on 1 other issuer

Listed on the same filings as Brook Byers. Their page shows their other deals.

LL
No photo found yet (own website and image search run after this page is viewed)
Person

Larry Leisure

Director · 6 shared filings (1 issuer) · also on 6 other issuers

Larry Leisure is on 7 issuers in total — a repeat sponsor. Their page lists every one.

MB
No photo found yet (own website and image search run after this page is viewed)
Person

Martin R. Brown

Executive Officer · 6 shared filings (1 issuer)

Listed on the same filings as Brook Byers. Their page shows their other deals.

AB
No photo found yet (own website and image search run after this page is viewed)
Person

Alain D. Baron

Executive Officer, Director · 6 shared filings (1 issuer) · also on 1 other issuer

Listed on the same filings as Brook Byers. Their page shows their other deals.

RS
No photo found yet (own website and image search run after this page is viewed)
Person

Ralph Snyderman

Director · 6 shared filings (2 issuers) · also on 1 other issuer

Listed on the same filings as Brook Byers. Their page shows their other deals.

WS
No photo found yet (own website and image search run after this page is viewed)
Person

William R. Salisbury

Executive Officer · 5 shared filings (1 issuer)

Listed on the same filings as Brook Byers. Their page shows their other deals.

AP
No photo found yet (own website and image search run after this page is viewed)
Person

Amy Paye

Executive Officer · 5 shared filings (2 issuers)

Listed on the same filings as Brook Byers. Their page shows their other deals.

TS
No photo found yet (own website and image search run after this page is viewed)
Person

Theodore Schlein

Executive Officer, Director · 5 shared filings (4 issuers) · also on 12 other issuers

Theodore Schlein is on 16 issuers in total — a repeat sponsor. Their page lists every one.

GG
No photo found yet (own website and image search run after this page is viewed)
Person

Ginger Graham

Director · 5 shared filings (1 issuer)

Listed on the same filings as Brook Byers. Their page shows their other deals.

MF
No photo found yet (own website and image search run after this page is viewed)
Person

Mark Fineman

Executive Officer · 5 shared filings (1 issuer)

Listed on the same filings as Brook Byers. Their page shows their other deals.

MW
No photo found yet (own website and image search run after this page is viewed)
Person

Mark Wiggins

Executive Officer · 5 shared filings (1 issuer) · also on 1 other issuer

Listed on the same filings as Brook Byers. Their page shows their other deals.

AH
No photo found yet (own website and image search run after this page is viewed)
Person

A. Grant Heidrich III

Director · 5 shared filings (1 issuer)

Listed on the same filings as Brook Byers. Their page shows their other deals.

WR
No photo found yet (own website and image search run after this page is viewed)
Person

William Rastetter

Director, Executive Officer · 4 shared filings (1 issuer) · also on 3 other issuers

Listed on the same filings as Brook Byers. Their page shows their other deals.

RL
No photo found yet (own website and image search run after this page is viewed)
Person

Raymond Lane

Executive Officer · 4 shared filings (3 issuers) · also on 19 other issuers

Raymond Lane is on 22 issuers in total — a repeat sponsor. Their page lists every one.

MG
No photo found yet (own website and image search run after this page is viewed)
Person

Michael Goldberg

Director · 4 shared filings (3 issuers) · also on 8 other issuers

Michael Goldberg is on 11 issuers in total — a repeat sponsor. Their page lists every one.

RK
No photo found yet (own website and image search run after this page is viewed)
Person

Richard Klausner

Director · 4 shared filings (1 issuer) · also on 7 other issuers

Richard Klausner is on 8 issuers in total — a repeat sponsor. Their page lists every one.

LL
No photo found yet (own website and image search run after this page is viewed)
Person

Louis Lange

Director · 4 shared filings (1 issuer) · also on 8 other issuers

Louis Lange is on 9 issuers in total — a repeat sponsor. Their page lists every one.

GS
No photo found yet (own website and image search run after this page is viewed)
Person

George Scangos

Director · 4 shared filings (1 issuer) · also on 3 other issuers

Listed on the same filings as Brook Byers. Their page shows their other deals.

MW
No photo found yet (own website and image search run after this page is viewed)
Person

Mark Weeks

Executive Officer · 4 shared filings (2 issuers) · also on 4 other issuers

Mark Weeks is on 6 issuers in total — a repeat sponsor. Their page lists every one.

LD
No photo found yet (own website and image search run after this page is viewed)
Person

L JOHN DOERR

Executive Officer · 4 shared filings (3 issuers) · also on 6 other issuers

L JOHN DOERR is on 9 issuers in total — a repeat sponsor. Their page lists every one.

JH
No photo found yet (own website and image search run after this page is viewed)
Person

Jeffrey T. Huber

Executive Officer, Director · 4 shared filings (1 issuer) · also on 1 other issuer

Listed on the same filings as Brook Byers. Their page shows their other deals.

TH
No photo found yet (own website and image search run after this page is viewed)
Person

Thomas Hawes

Director · 4 shared filings (1 issuer)

Listed on the same filings as Brook Byers. Their page shows their other deals.

MT
No photo found yet (own website and image search run after this page is viewed)
Person

Melinda Thomas

Executive Officer · 4 shared filings (1 issuer)

Listed on the same filings as Brook Byers. Their page shows their other deals.

RN
No photo found yet (own website and image search run after this page is viewed)
Person

Robert Nelsen

Director · 4 shared filings (1 issuer) · also on 38 other issuers

Robert Nelsen is on 39 issuers in total — a repeat sponsor. Their page lists every one.

MF
No photo found yet (own website and image search run after this page is viewed)
Person

Matthew Fust

Director · 3 shared filings (1 issuer) · also on 5 other issuers

Matthew Fust is on 6 issuers in total — a repeat sponsor. Their page lists every one.

AJ
No photo found yet (own website and image search run after this page is viewed)
Person

Andrea Jackson

Director · 3 shared filings (1 issuer) · also on 7 other issuers

Andrea Jackson is on 8 issuers in total — a repeat sponsor. Their page lists every one.

WL
No photo found yet (own website and image search run after this page is viewed)
Person

William Link

Director · 3 shared filings (1 issuer) · also on 28 other issuers

William Link is on 29 issuers in total — a repeat sponsor. Their page lists every one.

RB
No photo found yet (own website and image search run after this page is viewed)
Person

Richard J. Barry

Director · 3 shared filings (1 issuer) · also on 2 other issuers

Listed on the same filings as Brook Byers. Their page shows their other deals.

SS
No photo found yet (own website and image search run after this page is viewed)
Person

Sue Siegel

Director · 3 shared filings (1 issuer) · also on 2 other issuers

Listed on the same filings as Brook Byers. Their page shows their other deals.

CT
No photo found yet (own website and image search run after this page is viewed)
Person

Craig Taylor

Director · 3 shared filings (1 issuer) · also on 4 other issuers

Craig Taylor is on 5 issuers in total — a repeat sponsor. Their page lists every one.

SP
No photo found yet (own website and image search run after this page is viewed)
Person

Sean Parker

Director · 3 shared filings (1 issuer) · also on 13 other issuers

Sean Parker is on 14 issuers in total — a repeat sponsor. Their page lists every one.

TB
No photo found yet (own website and image search run after this page is viewed)
Person

Thomas Brunner

Director · 3 shared filings (1 issuer)

Listed on the same filings as Brook Byers. Their page shows their other deals.

The team behind the deals

KP
Sponsor group

Kleiner Perkins Caufield

10 issuers · 11 filings · $932.3M reported sold · 2010–2019

One team, 10 deal companies. Brook Byers is listed on 4 of them.

Sources

Issuers are grouped when their Form D filings share related persons, a management entity or a business address (automatic match from the filings). "Listed" marks the issuers that name Brook Byers.

Same business address

51 other issuers file from the same address (first 50 shown)

A shared address can mean the same team, a shared office building or a registered agent. It is a lead, not a conclusion.

Registrations and other filings

Adviser registration (Form ADV)

None of the 22 issuers this person is listed on appears in Form ADV (searched 24,962 advisers as of Oct 2, 2026). A person is never an adviser firm; Form ADV is checked for the issuers and the management companies they are listed with.

Other offering types (Regulation A and Regulation Crowdfunding)

Searched SEC Regulation A Data Sets (Forms 1-A, 1-K, 1-Z; 2015 Q2 → 2026 Q3); SEC Crowdfunding Offerings Data Sets (Form C family; 2016 Q2 → 2026 Q3); EDGAR form index for 2026 Q3 → 2026 Q4 (51,358 records as of Oct 23, 2026, 8:41 PM ET) — nothing matched this name.

Property records none — individuals are not matched

Property records are matched to companies only, never to individuals, so none are matched to Brook Byers by design. Searched property records in Hillsborough County FL (Clerk recorded-document index Oct 14, 2026 to Oct 15, 2026 + FL DOR 2026 ownership roll), Miami-Dade County FL (FL DOR 2026 ownership roll), Harris County TX (HCAD 2026 ownership roll), Dallas County TX (DCAD 2026 ownership roll), New York City ACRIS documents and PLUTO ownership rows already retrieved for other issuers, Cook County IL sale and ownership rows already retrieved for other issuers (814,874 records as of Oct 23, 2026, 8:59 PM ET) for the 22 issuers this person is listed on — nothing matched.

Public profiles and social

Websites and social links of the issuers Brook Byers is listed on: none on file. No website or social profile named in GRAIL, Inc.'s SEC filings (Form C, Reg A, Form ADV; checked Oct 24, 2026). Web search for this name: #55,265 of 374,652 in line (14 issuers searched so far). One-tap searches: Look further ↓

Look further

One-tap searches on sites we do not index ourselves, with the name pre-filled (Menlo Park, CA). Each opens in a new tab; what you find there is not verified by PartnerFacts.

Social and web

LinkedIn people search ↗Instagram ↗X (Twitter) ↗Facebook ↗YouTube ↗Google ↗Google Images ↗Google News ↗Meta Ad Library ↗

Courts

CourtListener / RECAP (federal) ↗PACER case locator (federal, login) ↗California — find the county court ↗Los Angeles Superior Court case search ↗Massachusetts MassCourts ↗

Securities regulators

SEC EDGAR full-text search ↗SEC action look-up ↗FINRA BrokerCheck ↗SEC IAPD adviser search ↗

Business registries

California Secretary of State business search ↗Massachusetts Secretary of State business search ↗OpenCorporates ↗

Change history

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