PartnerFacts
Data last updated: Oct 23, 2026, 5:45 PM ETLatest filing: Oct 22, 2026Now: Oct 24, 2026, 10:43 AM ET

Sponsor Check › Person

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

George Siber

Named as an officer, director or promoter on SEC Form D filings · MA · Apr 6, 2010 → Jan 13, 2021

3deals (issuers)
$431.5Mreported sold
74investors
16Form D filings
2010–2021years on file
Follow this personLook further ↓PDF

Data last updated Oct 23, 2026, 5:45 PM ET · Courts (RECAP) last checked: Oct 24, 2026, 2:22 AM ET · SEC enforcement last checked: covered by the index scan as of Oct 24, 2026, 2:50 AM ET

The short version

George Siber is listed as a director on 16 SEC Form D filings by 3 issuers between Apr 2010 and Jan 2021: Affinivax, Inc. (Cambridge, MA — biotechnology — 2018–2021; $226M reported sold to 27 investors), Cartesian Therapeutics, Inc. (Gaithersburg, MD — biotechnology — 2010–2015; $130M reported sold to 26 investors) and GENOCEA BIOSCIENCES, INC. (Cambridge, MA — biotechnology — 2011–2020; $75.5M reported sold to 21 investors).

What this means A repeat sponsor — 3 separate companies raised money with this person listed as director, over about 11 years. Across those companies the filings report $431.5M sold in total.

Listed alongside Amir Nashat (8 shared filings), Aymeric Sallin (8 shared filings), Carl L. Gordon (8 shared filings), Omid Farokhzad (8 shared filings), Peter Barton Hutt (8 shared filings) and 49 others.

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

Public records searched: federal courts (CourtListener / RECAP), SEC enforcement releases, state securities regulators (AK, AL, AR, AZ, CA, CO, CT, DC, DE, FINRA, FL, GA, HI, ID, IL, KS, KY, LA, MA, MD, ME, MI, MO, MS, MT, NASAA, NC, ND, NH, NM, NV, NY, OH, OK, OR, PA, RI, SC, SD, TN, TX, UT, VT, WA, WI, WV, WY) — 5 court cases matching the name listed in Key records below.

What this means 5 records came back, including 1 court case still open — open cases can take years and cost money. Each one is listed below with a link to the original document and a line saying why it matched. A name match is not proof it is the same person or company — read the why line and the document. Being sued or named in a release is an accusation, not a finding.

We compared 16 public filings for George Siber and found 9 differences, 1 worth asking the sponsor about: 5 court cases name George Siber; 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 George Siber has not run yet — it is joining a line of 59,635 names; searches run around the clock at the hosts' allowed rate. Searched so far: 678 names.

Community comments are quoted as written by their authors. Sources searched: Bing (site:reddit.com / site:biggerpockets.com) and Reddit's own search, plus DuckDuckGo/Brave/BiggerPockets search when they are answering.

Key records

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

1. Lawsuits

5 cases: 1 open, 2 closed (disposition not in docket feed), 2 dismissed

Geneva Gonzales v. Siber Systems Inc open
District Court, C.D. California · No. 2:26-cv-04391 · Filed Apr 24, 2026
Role of Siber Systems Inc: Defendant · Outcome: Open — no termination date on the docket (bulk snapshot 2026-09-30) Docket on CourtListener ↗
same rare surname (3 people in Form D filings, 6 federal dockets); surname only in the caption; court in CA (not a filing state)
TG--2006 Holdings, LLC v. Siber Systems Inc. closed
District Court, E.D. Virginia · No. 1:24-cv-00174 · Filed Feb 2, 2024 · Closed Mar 15, 2024
Role of Siber Systems Inc.: Defendant · Outcome: Terminated 2024-03-15 (disposition not included in the bulk docket feed — see docket) Docket on CourtListener ↗
same rare surname (3 people in Form D filings, 6 federal dockets); surname only in the caption; court in VA (not a filing state)
SIBER TELECOM INC v. ARIANA TELECOMMUNICA, ET AL closed
District Court, D. Maine · No. · Filed Aug 28, 2001 · Closed Mar 4, 2002 · Nature of suit: 190 Other contract actions
Role of SIBER TELECOM INC: Plaintiff · Outcome: Terminated 2002-03-04 (disposition not included in the bulk docket feed — see docket) Docket on CourtListener ↗
same rare surname (3 people in Form D filings, 6 federal dockets); surname only in the caption; court in ME (not a filing state)
SIBER TELECOM INC v. ARIANA TELECOMMUNICA dismissed
District Court, D. Maine · No. 1:01-cv-00176 · Filed Aug 28, 2001 · Closed May 1, 2002 · Nature of suit: 190 Other contract actions
Role of SIBER TELECOM INC: Plaintiff · Outcome: Terminated 2002-05-01 — FJC Integrated Database disposition: Voluntarily dismissed Docket on CourtListener ↗
same rare surname (3 people in Form D filings, 6 federal dockets); surname only in the caption; court in ME (not a filing state)
SIBER TELECOM INC v. ARIANA TELECOMMUNICA dismissed
District Court, D. Maine · No. 1:01-cv-00175 · Filed Aug 28, 2001 · Closed Mar 4, 2002 · Nature of suit: 890 Other statutory actions
Role of SIBER TELECOM INC: Plaintiff · Outcome: Terminated 2002-03-04 — FJC Integrated Database disposition: Voluntarily dismissed Docket on CourtListener ↗
same rare surname (3 people in Form D filings, 6 federal dockets); surname only in the caption; court in ME (not a filing state)
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, 2:22 AM ET.

Court records show docket facts only; we never restate allegations as facts. Outcome wording comes from the docket feed; where it does not state a disposition we say so.

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: 48 regulators (FINRA, NASAA, 37 states) — crawled Oct 24, 2026, 8:48 AM ET

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 George Siber..

State securities regulators: Securities regulators searched (64,910 actions): FINRA (38,350 actions, 1995–2026), NASAA (31 actions, 2000–2026; listing starts 1997), AK Division of Banking and Securities (273 actions, 1971–2025), AL Securities Commission (880 actions, 2001–2026), AR Securities Department (1,305 actions, 1998–2026), AZ Corporation Commission Securities Division (411 actions, 2017–2026), CA DFPI (25 actions, 2007–2024; listing starts 2002 — 16 of 12,159 DFPI respondent pages read so far; sponsor-name matches are read first), CO Division of Securities (731 actions, 2001–2026; older years from the Internet Archive (snapshot of 2026-05-02)), CT Department of Banking Securities Division (940 actions, 2006–2026; older years from the Internet Archive (snapshot of 2026-04-22)), DC DISB Securities Bureau (25 actions, 2012–2026), DE DOJ Investor Protection Unit (257 actions, 1987–2026), FL Office of Financial Regulation (49 actions, 2018–2026), GA Secretary of State Securities Division (65 actions, 2015–2026; listing starts 2012), HI DCCA Securities Enforcement Branch (26 actions, 2012–2026), ID Department of Finance Securities Bureau (663 actions, 1994–2026), IL Secretary of State Securities Department (4,122 actions, 2003–2023), KS Insurance Department Securities Division (58 actions), KY Department of Financial Institutions (342 actions, 2005–2026), LA Office of Financial Institutions Securities Division (13 actions, 2010–2025; listing starts 2008), MA Secretary of the Commonwealth Securities Division (125 actions, 2012–2025; live site blocks automated access — loaded from the Internet Archive snapshot of 2026-02-04), MD Attorney General Securities Division (1,054 actions, 2004–2026), ME Office of Securities (539 actions, 2000–2026), MI LARA Corporations, Securities & Commercial Licensing Bureau (201 actions), MO Secretary of State Securities Division (919 actions, 1998–2026), MS Secretary of State Securities Division (209 actions, 1995–2026), MT Commissioner of Securities and Insurance (597 actions, 2000–2026), NC Secretary of State Securities Division (265 actions, 2004–2024), ND Securities Department (711 actions, 1990–2026; the regulator no longer publishes this list live — loaded from the Internet Archive snapshot of 2026-01-06), NH Bureau of Securities Regulation (402 actions, 2002–2026), NM Regulation and Licensing Department Securities Division (90 actions, 2010–2025), NV Secretary of State Securities Division (118 actions, 2018–2026), NY Attorney General Investor Protection Bureau (44 actions, 2012–2026), OH Division of Securities (327 actions, 1993–2006), OK Department of Securities (2,531 actions, 1998–2026), OR Division of Financial Regulation (589 actions, 1988–2026), PA Department of Banking and Securities (1,448 actions, 2008–2024; the regulator no longer publishes this list live — loaded from the Internet Archive snapshot of 2024-08-09), RI DBR Securities Division (98 actions, 2005–2025), SC Attorney General Securities Division (540 actions, 2006–2026), SD Division of Insurance – Securities Regulation (106 actions, 2017–2026), TN Department of Commerce and Insurance Securities Division (405 actions, 1992–2026), TX State Securities Board (936 actions, 1999–2026), UT Division of Securities (772 actions, 2000–2026; older years from the Internet Archive (snapshot of 2010-05-27)), VT DFR Securities Division (137 actions, 2010–2026), WA DFI (2,039 actions, 2001–2026), WI DFI Division of Securities (1,072 actions, 1998–2026), WV Securities Commission (State Auditor) (64 actions), WY Secretary of State Compliance Division (6 actions, 2016–2024) — last crawled Oct 24, 2026, 8:48 AM ET. No machine-readable public listing today for IA, IN, MN, NE, NJ, VA (see docs/state-regulators.md).

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, 2:22 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

9 differences found between the filings for George Siber — 1 worth asking about (compared 16 filings on Oct 24, 2026)

Note · Jul 5, 2022 – Nov 25, 2024

Bankruptcy case: Genocea Biosciences, Inc. — filed Jul 5, 2022

United States Bankruptcy Court, D. Massachusetts docket "Genocea Biosciences, Inc." filed Jul 5, 2022, closed Nov 25, 2024. GENOCEA BIOSCIENCES, INC. (related issuer) is listed as Debtor ("Genocea Biosciences, Inc."). Our match estimate: 80%.

What this means A bankruptcy filing was found. Many are old or personal and have nothing to do with the deal — but ask what it was and when it closed.

Docket · United States Bankruptcy Court, D. Massachusetts ↗GENOCEA BIOSCIENCES, INC. — PartnerFacts page ↗
Sources
Note · Jan 26, 2023 – Jan 3, 2024

Bankruptcy case: Genocea Biosciences, Inc. v. 100 Discovery Park DE, LLC — filed Jan 26, 2023

United States Bankruptcy Court, D. Massachusetts docket "Genocea Biosciences, Inc. v. 100 Discovery Park DE, LLC" filed Jan 26, 2023, closed Jan 3, 2024. GENOCEA BIOSCIENCES, INC. (related issuer) is listed as Plaintiff ("Genocea Biosciences, Inc."). Our match estimate: 80%.

What this means A bankruptcy filing was found. Many are old or personal and have nothing to do with the deal — but ask what it was and when it closed.

Docket · United States Bankruptcy Court, D. Massachusetts ↗GENOCEA BIOSCIENCES, INC. — PartnerFacts page ↗
Sources
Note · Jan 26, 1990 – Aug 18, 1992

Bankruptcy case: David Siewers — filed Jan 26, 1990

United States Bankruptcy Court, D. Massachusetts docket "David Siewers" filed Jan 26, 1990, closed Aug 18, 1992. David Siewers (listed on the same filings) is listed as Debtor ("David Siewers"). Our match estimate: 65%.

What this means A bankruptcy filing was found. Many are old or personal and have nothing to do with the deal — but ask what it was and when it closed.

Docket · United States Bankruptcy Court, D. Massachusetts ↗David Siewers — PartnerFacts page ↗
Sources
Worth asking · Aug 28, 2001 – Apr 24, 2026

5 court cases name George Siber — 2 as defendant

By role: defendant in 2, plaintiff in 3. Newest: "Geneva Gonzales v. Siber Systems Inc" (District Court, C.D. California, Apr 24, 2026); "TG--2006 Holdings, LLC v. Siber Systems Inc." (District Court, E.D. Virginia, Feb 2, 2024); "SIBER TELECOM INC v. ARIANA TELECOMMUNICA, ET AL" (District Court, D. Maine, Aug 28, 2001). Some of these are name matches with a match estimate below 95% — check each docket.

What this means Several court cases name this subject. Some are routine business suits. Ask what each was about and how it ended.

Docket · Geneva Gonzales v. Siber Systems Inc ↗Docket · TG--2006 Holdings, LLC v. Siber Systems Inc. ↗Docket · SIBER TELECOM INC v. ARIANA TELECOMMUNICA, ET AL ↗Docket · SIBER TELECOM INC v. ARIANA TELECOMMUNICA ↗
Sources
Note · Dec 17, 2010 – Jan 3, 2011

Form D filed 17 days after the first sale — GENOCEA BIOSCIENCES, INC.

The filing says the first sale was Dec 17, 2010. The Form D was filed Jan 3, 2011 — 17 days later. The rule: a Form D is generally due within 15 days after the first sale, so this one is 2 days past that.

What this means A late notice is common and carries no penalty by itself. It is worth asking the sponsor why the paperwork lagged.

Form D · Jan 3, 2011 ↗GENOCEA BIOSCIENCES, INC. — PartnerFacts page ↗
Sources
Note · Nov 7, 2011 – Aug 3, 2020

6 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 — GENOCEA BIOSCIENCES, INC. (latest filing Aug 3, 2020) · No amendment in the last 12 months on an offering that may still be open — GENOCEA BIOSCIENCES, INC. (latest filing Feb 27, 2019) · No amendment in the last 12 months on an offering that may still be open — Cartesian Therapeutics, Inc. (latest filing Sep 10, 2015) · No amendment in the last 12 months on an offering that may still be open — Cartesian Therapeutics, Inc. (latest filing Apr 23, 2015) · No amendment in the last 12 months on an offering that may still be open — Cartesian Therapeutics, Inc. (latest filing Apr 9, 2014) · and 1 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 · Aug 3, 2020 ↗GENOCEA BIOSCIENCES, INC. — PartnerFacts page ↗Form D · Feb 27, 2019 ↗Form D · Sep 10, 2015 ↗
Sources
Note · Jan 3, 2011 – Oct 11, 2012

Industry group changed between filings — GENOCEA BIOSCIENCES, INC.

"Pharmaceuticals" (Jan 3, 2011); then "Biotechnology" (Oct 11, 2012 to Aug 3, 2020).

What this means The issuer described its business differently on different forms. Often it is just a different box ticked; sometimes the deal itself changed. Ask which business your money is in.

Form D · Jan 3, 2011 ↗Form D · Oct 11, 2012 ↗GENOCEA BIOSCIENCES, INC. — PartnerFacts page ↗
Sources
Note · Jan 23, 2025 – Jul 6, 2026

Same name, different state: "George Siber" (CA) is a separate record

This page covers filings where the address state is MA. A separate record, "George Siber" with address state CA, is listed on 10 filings — most recently by CELESTIAL THERAPEUTICS INC. (Jul 6, 2026). The two records do not overlap in time: this page runs Apr 6, 2010 to Jan 13, 2021; the other runs Jan 23, 2025 to Jul 6, 2026.

What this means Could be the same person who moved, or two people with the same name. We keep them apart until a filing ties them together. Check both pages before you decide.

George Siber (CA) — PartnerFacts page ↗Form D/A · Jul 6, 2026 ↗CELESTIAL THERAPEUTICS INC. — PartnerFacts page ↗George Siber (MA) — this page ↗
Sources
Note · Jan 5, 2018 – Jan 13, 2021

Address moved from North Cambridge, MA to Cambridge, MA — Affinivax, Inc.

The people listed on the Jan 5, 2018 filing give North Cambridge, MA; on the Jan 13, 2021 filing they give Cambridge, MA.

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 · Jan 5, 2018 ↗Form D · Jan 13, 2021 ↗Affinivax, Inc. — PartnerFacts page ↗
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. As of Oct 24, 2026.

5. Money to insiders

2 of 15 offerings report sales commissions totalling $5,540,000; 0 report finder's fees; 0 report proceeds to related persons. (includes amounts the issuer reported as estimates)

Offering (latest filing)Sales commissionsFinder's feesTo insidersPaid to sell itSource
Jan 13, 2021 D
Affinivax, Inc.
File 021-386253
$0$0$0None listed on this filingEDGAR ↗
Aug 3, 2020 D
GENOCEA BIOSCIENCES, INC.
File 021-372378
$4,790,000 (est.)$0$0STIFEL, NICOLAUS & COMPANY, INCORPORATED BrokerCheck CRD 793 ↗EDGAR ↗
Feb 27, 2019 D
GENOCEA BIOSCIENCES, INC.
File 021-333740
$750,000 (est.)$0$0None listed on this filingEDGAR ↗
Jan 5, 2018 D
Affinivax, Inc.
File 021-302491
$0$0$0None listed on this filingEDGAR ↗
Sep 10, 2015 D
Cartesian Therapeutics, Inc.
File 021-247362
$0$0$0None listed on this filingEDGAR ↗
Apr 23, 2015 D
Cartesian Therapeutics, Inc.
File 021-238498
$0$0$0None listed on this filingEDGAR ↗
Aug 28, 2014 D
Cartesian Therapeutics, Inc.
File 021-223752
$0$0$0None listed on this filingEDGAR ↗
Jul 15, 2014 D
Cartesian Therapeutics, Inc.
File 021-221143
$0$0$0None listed on this filingEDGAR ↗
Apr 9, 2014 D
Cartesian Therapeutics, Inc.
File 021-215195
$0$0$0None listed on this filingEDGAR ↗
Oct 10, 2013 D
GENOCEA BIOSCIENCES, INC.
File 021-204325
$0$0$0None listed on this filingEDGAR ↗
Jul 2, 2013 D/A
GENOCEA BIOSCIENCES, INC.
File 021-185355
$0$0$0None listed on this filingEDGAR ↗
Nov 17, 2011 D
Cartesian Therapeutics, Inc.
File 021-168905
$0$0$0
None other than salaries and bonuses in the ordinary course of business.
None listed on this filingEDGAR ↗
Nov 17, 2011 D
Cartesian Therapeutics, Inc.
File 021-168906
$0$0$0
None other than salaries and bonuses in the ordinary course of business.
None listed on this filingEDGAR ↗
Jan 3, 2011 D
GENOCEA BIOSCIENCES, INC.
File 021-152851
$0$0$0None listed on this filingEDGAR ↗
Apr 6, 2010 D
Cartesian Therapeutics, Inc.
File 021-125893
$0$0$0
None other than salaries and bonuses in the ordinary course of business.
None 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 3

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

A
Biotechnology

Affinivax, Inc.

Cambridge, MA · Jan 5, 2018 → Jan 13, 2021 · 2 filings
  • Jan 13, 2021 · D · $225,999,698 sold of $225,999,698 · 27 investors · min. No minimum reported · role: Director EDGAR ↗
  • Jan 5, 2018 · D · $6,987,455 sold of $6,987,455 · 5 investors · min. No minimum reported · role: Director EDGAR ↗

Raised $226M from 27 investors (100% of the $226M target) as of the latest filing. George 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.

GB
Biotechnology

GENOCEA BIOSCIENCES, INC.

Cambridge, MA · Jan 3, 2011 → Aug 3, 2020 · 6 filings
  • Aug 3, 2020 · D · $75,508,015 sold of $79,877,762 · 18 investors · min. No minimum reported · role: Director EDGAR ↗
  • Feb 27, 2019 · D · $12,066,763 sold of $15,002,599 · 9 investors · min. No minimum reported · role: Director EDGAR ↗
  • Oct 10, 2013 · D · $400,000 sold of $400,000 · 1 investors · min. No minimum reported · role: Director EDGAR ↗
  • Jul 2, 2013 · D/A · $30,500,000 sold of $30,500,000 · 21 investors · min. No minimum reported · role: Director EDGAR ↗
  • Oct 11, 2012 · D · $15,250,000 sold of $30,500,000 · 21 investors · min. No minimum reported · role: Director EDGAR ↗
  • Jan 3, 2011 · D · $35,099,999 sold of $35,099,999 · 16 investors · min. No minimum reported · role: Director EDGAR ↗

Raised $75.5M from 21 investors (95% of the $79.9M target) as of the latest filing. George 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. "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.

CT
Biotechnology

Cartesian Therapeutics, Inc.

Gaithersburg, MD · Apr 6, 2010 → Sep 10, 2015 · 8 filings
  • Sep 10, 2015 · D · $37,400,000 sold of $40,637,943 · 19 investors · min. No minimum reported · role: Director EDGAR ↗
  • Apr 23, 2015 · D · $5,942,306 sold of $7,500,000 · 12 investors · min. No minimum reported · role: Director EDGAR ↗
  • Aug 28, 2014 · D · $4,450,000 sold of $4,450,000 · 11 investors · min. $100,000 · role: Director EDGAR ↗
  • Jul 15, 2014 · D · $6,000,000 sold of $6,000,000 · 2 investors · min. $3,000,000 · role: Director EDGAR ↗
  • Apr 9, 2014 · D · $5,292,702 sold of $9,999,994 · 11 investors · min. No minimum reported · role: Director EDGAR ↗
  • Nov 17, 2011 · D · $3,500,000 sold of $26,000,000 · 1 investors · min. No minimum reported · role: Director EDGAR ↗
  • Nov 17, 2011 · D · $22,000,000 sold of $22,000,000 · 16 investors · min. No minimum reported · role: Director EDGAR ↗
  • Apr 6, 2010 · D · $15,000,006 sold of $15,000,006 · 14 investors · min. No minimum reported · role: Director EDGAR ↗

Raised $130M from 26 investors (100% of the $40.6M target) as of the latest filing. George is listed as director on 8 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.

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.

  • George Siber — CA, 1 issuer, Jan 23, 2025 → Jul 6, 2026 · no shared issuer

People around George 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.

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

Carl L. Gordon

Director · 8 shared filings (1 issuer) · also on 61 other issuers

Carl L. Gordon is on 62 issuers in total — a repeat sponsor. Their page lists every one.

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

Robert Langer

Director · 8 shared filings (1 issuer) · also on 47 other issuers

Robert Langer is on 48 issuers in total — a repeat sponsor. Their page lists every one.

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

Amir Nashat

Director · 8 shared filings (1 issuer) · also on 28 other issuers

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

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

Peter Barton Hutt

Director · 8 shared filings (1 issuer) · also on 14 other issuers

Peter Barton Hutt is on 15 issuers in total — a repeat sponsor. Their page lists every one.

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

Omid Farokhzad

Director · 8 shared filings (1 issuer) · also on 3 other issuers

Listed on the same filings as George Siber. Their page shows their other deals.

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

Aymeric Sallin

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

Listed on the same filings as George Siber. Their page shows their other deals.

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

Werner Cautreels

Executive Officer, Director · 7 shared filings (1 issuer) · also on 2 other issuers

Listed on the same filings as George Siber. Their page shows their other deals.

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

David Siewers

Executive Officer · 7 shared filings (1 issuer)

Listed on the same filings as George Siber. Their page shows their other deals.

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

JESSICA BAKER FLECHTNER

Executive Officer · 6 shared filings (1 issuer)

Listed on the same filings as George Siber. Their page shows their other deals.

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

WILLIAM CLARK

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

Listed on the same filings as George Siber. Their page shows their other deals.

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

Yuriy Udaltsov

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

Listed on the same filings as George Siber. Their page shows their other deals.

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

Edwin M. Kania, Jr.

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

Edwin M. Kania, Jr. is on 6 issuers in total — a repeat sponsor. Their page lists every one.

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

David Abraham

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

Listed on the same filings as George Siber. Their page shows their other deals.

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

Kevin Bitterman

Director · 4 shared filings (1 issuer) · also on 23 other issuers

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

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

SIMEON GEORGE

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

Listed on the same filings as George Siber. Their page shows their other deals.

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

Robert Paull

Director · 4 shared filings (1 issuer) · also on 6 other issuers

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

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

PAUL GIANNASCA

Executive Officer · 4 shared filings (1 issuer)

Listed on the same filings as George Siber. Their page shows their other deals.

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

ROBERT E. FARRELL JR.

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

Listed on the same filings as George Siber. Their page shows their other deals.

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

Katrine Bosley

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

Listed on the same filings as George Siber. Their page shows their other deals.

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

SETH HETHERINGTON

Executive Officer · 3 shared filings (1 issuer)

Listed on the same filings as George Siber. Their page shows their other deals.

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

RAVI VENKATARAMANI

Executive Officer · 3 shared filings (1 issuer)

Listed on the same filings as George Siber. Their page shows their other deals.

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

Richard Malley

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

Listed on the same filings as George Siber. Their page shows their other deals.

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

Asish Xavier

Director · 2 shared filings (1 issuer) · also on 21 other issuers

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

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

Michael Higgins

Director · 2 shared filings (1 issuer) · also on 7 other issuers

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

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

Robert More

Director · 2 shared filings (1 issuer) · also on 14 other issuers

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

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

Stephen Hoffman

Director · 2 shared filings (1 issuer) · also on 5 other issuers

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

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

Kenneth Bate

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

Listed on the same filings as George Siber. Their page shows their other deals.

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

Cole Douglas

Director · 2 shared filings (1 issuer)

Listed on the same filings as George Siber. Their page shows their other deals.

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

Steven Brugger

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

Listed on the same filings as George Siber. Their page shows their other deals.

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

Frances Heller

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

Listed on the same filings as George Siber. Their page shows their other deals.

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

Lloyd Johnston

Executive Officer · 2 shared filings (1 issuer)

Listed on the same filings as George Siber. Their page shows their other deals.

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

Peter Keller

Executive Officer · 2 shared filings (1 issuer)

Listed on the same filings as George Siber. Their page shows their other deals.

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

Takashi Kei Kishimoto

Executive Officer · 2 shared filings (1 issuer)

Listed on the same filings as George Siber. Their page shows their other deals.

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

Ali Behbahani

Director · 2 shared filings (1 issuer) · also on 5 other issuers

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

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

Girish Aakalu

Executive Officer · 2 shared filings (1 issuer)

Listed on the same filings as George Siber. Their page shows their other deals.

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

Ronald Cooper

Director · 2 shared filings (1 issuer)

Listed on the same filings as George Siber. Their page shows their other deals.

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

Thomas Davis

Executive Officer · 2 shared filings (1 issuer)

Listed on the same filings as George Siber. Their page shows their other deals.

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

Howard Mayer

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

Listed on the same filings as George Siber. Their page shows their other deals.

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

Steven Altschuler

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

Listed on the same filings as George Siber. Their page shows their other deals.

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

Douglas Cole

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

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

The team behind the deals

Same business address

12 other issuers file from the same address

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

Business registration (state registry / Secretary of State)

Individuals are not matched to business registrations — registries list companies, and a name alone is not enough to tie a person to one. Officers and managers appear by name inside each matched company's record on the issuer pages. Registries searched: AL (Alabama Secretary of State — Business Entity Records (arc-sos.state.al.us), searched by issuer name, data as of Oct 24, 2026); CO (Colorado Secretary of State — Business Entities in Colorado (data.colorado.gov), data as of Oct 23, 2026); CT (Connecticut Secretary of the State — Business Registry (data.ct.gov), data as of Oct 24, 2026); FL (Florida Department of State, Division of Corporations — quarterly corporate data file (Sunbiz), data as of Oct 7, 2026); KY (Kentucky Secretary of State — Business Entity Search (sosbes.sos.ky.gov), searched by issuer name, data as of Oct 24, 2026); NY (New York Department of State — Corporations and Other Entities (data.ny.gov: All Filings + Active Corporations), data as of Oct 20, 2026); OR (Oregon Secretary of State — Active Businesses, All (data.oregon.gov), data as of Oct 20, 2026); PA (Pennsylvania Department of State — Registered Businesses, Current (data.pa.gov), data as of Oct 6, 2026); TX (Texas Comptroller — Active Franchise Taxpayers incl. Secretary of State file data (data.texas.gov), data as of Oct 24, 2026). Registries of other states have not been searched: many publish no bulk file and require a CAPTCHA or bot challenge on their search page, which we do not bypass (Delaware, for example, offers no public bulk file).

Adviser registration (Form ADV)

None of the 3 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 George Siber 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 3 issuers this person is listed on — nothing matched.

Public profiles and social

Websites and social links of the issuers George Siber is listed on: none on file. No website or social profile named in GENOCEA BIOSCIENCES, INC.'s SEC filings (Form C, Reg A, Form ADV; checked Oct 24, 2026). Web search for this name: #211,573 of 374,652 in line (1,386 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 (Cambridge, MA). 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) ↗Massachusetts MassCourts ↗Maryland Judiciary case search ↗

Securities regulators

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

Business registries

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

Change history

No corrections have been requested for this page.

Every fact links to its public-record source. Plain-English notes next to a fact are our reading of that fact, not a rating. Request a correction · Facts policy

Request a correction

Free. Logged with status: received → under review → fixed / confirmed with source.

Add a response

If this is you or your firm, add a sourced explanation next to any fact. Reviewed before publishing.

Monitor this person

Members get an email when George Siber appears on a new Form D, or when a court case or SEC action is matched to them. See plans →