PartnerFacts
Data last updated: Oct 23, 2026, 5:45 PM ETLatest filing: Oct 22, 2026Now: Oct 24, 2026, 10:31 AM ET

Sponsor Check › Person

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

Daniel Leff

Named as an officer, director or promoter on SEC Form D filings · MA · Dec 28, 2018 → Jan 10, 2025

4deals (issuers)
$209.2Mreported sold
46investors
6Form D filings
2018–2025years on file
Follow this personLook further ↓PDF

Data last updated Oct 23, 2026, 5:45 PM ET · Courts (RECAP) last checked: Oct 24, 2026, 2:42 AM ET · SEC enforcement last checked: covered by the index scan as of Oct 24, 2026, 2:50 AM ET

The short version

Daniel Leff is listed as an executive officer and director on 6 SEC Form D filings by 4 issuers between Dec 2018 and Jan 2025: Ambri Inc. (Marlborough, MA — other energy — 2018–2021; $143.8M reported sold to 14 investors), Mantel Capture, Inc. (Cambridge, MA — industry reported as "Other" — 2024; $29.4M reported sold to 13 investors), VEIR, Inc. (Woburn, MA — industry reported as "Other" — 2023; $24.9M reported sold to 11 investors) and Ambri, Inc. (Marlborough, MA — other energy — 2024–2025; $11.1M reported sold to 8 investors).

What this means A repeat sponsor — 4 separate companies raised money with this person listed as executive officer and director, over about 7 years. Across those companies the filings report $209.2M sold in total.

Listed alongside David Bradwell (4 shared filings), Adam Briggs (3 shared filings), Donald Sadoway (2 shared filings), Duncan Bourgoin (2 shared filings), Lewis Von Thaer (2 shared filings) and 16 others.

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

2 of the issuers belong to the sponsor group Ambri (2 issuers, $154.9M reported sold, 2012–2025).

What this means A sponsor group is one team that sets up a new company for each deal. Ambri has 2 companies on file and $154.9M 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 (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) — 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 6 public filings for Daniel Leff and found 10 differences, 1 worth asking the sponsor about: Form D filed 77 days after the first sale; 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 Daniel Leff has not run yet — it is joining a line of 55,687 names; searches run around the clock at the hosts' allowed rate. Searched so far: 641 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

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, 2:42 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: 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 Daniel Leff..

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, 2:42 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

10 differences found between the filings for Daniel Leff — 1 worth asking about (compared 6 filings on Oct 24, 2026)

Worth asking · Jun 20, 2024 – Sep 5, 2024

Form D filed 77 days after the first sale — Mantel Capture, Inc.

The filing says the first sale was Jun 20, 2024. The Form D was filed Sep 5, 2024 — 77 days later. The rule: a Form D is generally due within 15 days after the first sale, so this one is 62 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 · Sep 5, 2024 ↗Mantel Capture, Inc. — PartnerFacts page ↗
Sources
Note · Aug 1, 2024 – Jan 10, 2025

No amendment in the last 12 months on an offering that may still be open — Ambri, Inc. (latest filing Jan 10, 2025)

The latest filing for this offering is dated Jan 10, 2025 (first sale Aug 1, 2024). It reports $11,140,631 sold of $15,357,067 offered. No later amendment is in our index as of Oct 24, 2026.

What this means SEC rules expect a yearly amendment while an offering is still going. The raise may simply have ended — a Form D does not say when it closed. Ask the sponsor whether the offering closed, when, and at what amount.

Form D/A · Jan 10, 2025 ↗Ambri, Inc. — PartnerFacts page ↗
Sources
Note · Jun 20, 2024 – Sep 5, 2024

No amendment in the last 12 months on an offering that may still be open — Mantel Capture, Inc. (latest filing Sep 5, 2024)

The latest filing for this offering is dated Sep 5, 2024 (first sale Jun 20, 2024). It reports $29,424,989 sold of $30,000,000 offered. No later amendment is in our index as of Oct 24, 2026.

What this means SEC rules expect a yearly amendment while an offering is still going. The raise may simply have ended — a Form D does not say when it closed. Ask the sponsor whether the offering closed, when, and at what amount.

Form D · Sep 5, 2024 ↗Mantel Capture, Inc. — PartnerFacts page ↗
Sources
Note · Aug 9, 2021 – Aug 24, 2021

No amendment in the last 12 months on an offering that may still be open — Ambri Inc. (latest filing Aug 24, 2021)

The latest filing for this offering is dated Aug 24, 2021 (first sale Aug 9, 2021). It reports $143,761,093 sold of $149,411,093 offered. No later amendment is in our index as of Oct 24, 2026.

What this means SEC rules expect a yearly amendment while an offering is still going. The raise may simply have ended — a Form D does not say when it closed. Ask the sponsor whether the offering closed, when, and at what amount.

Form D · Aug 24, 2021 ↗Ambri Inc. — PartnerFacts page ↗
Sources
Note · Aug 15, 2024 – Jan 10, 2025

Offering amount changed between filings — Ambri, Inc.

The Aug 15, 2024 filing says $7,357,067 offered; the Jan 10, 2025 Form D/A says $15,357,067.

What this means The target raise changed. Raising the cap is common when a deal grows; ask whether the extra money has the same terms and use.

Form D (earlier) · Aug 15, 2024 ↗Form D/A (later) · Jan 10, 2025 ↗Ambri, Inc. — PartnerFacts page ↗
Sources
Note · Mar 18, 2026 – Oct 9, 2026

Same name, different state: "Daniel P. Leff" (FL) is a separate record

This page covers filings where the address state is MA. A separate record, "Daniel P. Leff" with address state FL, is listed on 2 filings — most recently by M2X Energy Inc. (Oct 9, 2026). The two records do not overlap in time: this page runs Dec 28, 2018 to Jan 10, 2025; the other runs Mar 18, 2026 to Oct 9, 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.

Daniel P. Leff (FL) — PartnerFacts page ↗Form D · Oct 9, 2026 ↗M2X Energy Inc. — PartnerFacts page ↗Daniel Leff (MA) — this page ↗
Sources
Note · Apr 11, 2019 – Aug 27, 2025

Same name, different state: "Daniel Leff" (DC) is a separate record

This page covers filings where the address state is MA. A separate record, "Daniel Leff" with address state DC, is listed on 7 filings — most recently by Spark Community Investment Co (Aug 27, 2025). Both records have filings in the same period (Apr 11, 2019 to Jan 10, 2025).

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.

Daniel Leff (DC) — PartnerFacts page ↗Form D · Aug 27, 2025 ↗Spark Community Investment Co — PartnerFacts page ↗Daniel Leff (MA) — this page ↗
Sources
Note · Aug 12, 2011 – Apr 5, 2024

Same name, different state: "Daniel Leff" (CO or CA) is a separate record

This page covers filings where the address state is MA. A separate record, "Daniel Leff" with address state CO or CA, is listed on 20 filings — most recently by Waverley Capital II, L.P. (Apr 5, 2024). Both records have filings in the same period (Dec 28, 2018 to Apr 5, 2024).

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.

Daniel Leff (CO,CA) — PartnerFacts page ↗Form D/A · Apr 5, 2024 ↗Waverley Capital II, L.P. — PartnerFacts page ↗Daniel Leff (MA) — this page ↗
Sources
Note · May 18, 2018

Same name, different state: "Daniel Leff" (WA) is a separate record

This page covers filings where the address state is MA. A separate record, "Daniel Leff" with address state WA, is listed on 1 filing — most recently by Novel Effect, Inc. (May 18, 2018). The two records do not overlap in time: this page runs Dec 28, 2018 to Jan 10, 2025; the other has one filing dated May 18, 2018.

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.

Daniel Leff (WA) — PartnerFacts page ↗Form D · May 18, 2018 ↗Novel Effect, Inc. — PartnerFacts page ↗Daniel Leff (MA) — this page ↗
Sources
Note · Aug 20, 2015 – Mar 21, 2016

Same name, different state: "Daniel Leff" (NY) is a separate record

This page covers filings where the address state is MA. A separate record, "Daniel Leff" with address state NY, is listed on 2 filings — most recently by fuboTV Inc. (Mar 21, 2016). The two records do not overlap in time: this page runs Dec 28, 2018 to Jan 10, 2025; the other runs Aug 20, 2015 to Mar 21, 2016.

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.

Daniel Leff (NY) — PartnerFacts page ↗Form D · Mar 21, 2016 ↗fuboTV Inc. — PartnerFacts page ↗Daniel Leff (MA) — this 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

None reported on 5 offerings — no sales commissions, finder's fees or proceeds to insiders

Per-offering detail
Offering (latest filing)Sales commissionsFinder's feesTo insidersPaid to sell itSource
Jan 10, 2025 D/A
Ambri, Inc.
File 021-521664
$0$0$0None listed on this filingEDGAR ↗
Sep 5, 2024 D
Mantel Capture, Inc.
File 021-523331
$0$0$0None listed on this filingEDGAR ↗
May 25, 2023 D
VEIR, Inc.
File 021-482607
$0$0$0None listed on this filingEDGAR ↗
Aug 24, 2021 D
Ambri Inc.
File 021-410999
$0$0$0None listed on this filingEDGAR ↗
Dec 28, 2018 D
Ambri Inc.
File 021-329189
$0$0$0None listed on this filingEDGAR ↗

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 4

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

A
Other Energy · group: Ambri

Ambri, Inc.

Marlborough, MA · Aug 15, 2024 → Jan 10, 2025 · 2 filings
  • Jan 10, 2025 · D/A · $11,140,631 sold of $15,357,067 · 8 investors · min. No minimum reported · role: Director EDGAR ↗
  • Aug 15, 2024 · D · $7,357,067 sold of $7,357,067 · 8 investors · min. No minimum reported · role: Director EDGAR ↗

Raised $11.1M from 8 investors (73% of the $15.4M target) as of the latest filing. Daniel 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 Energy / 506(b) (1,000 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.

MC
Other

Mantel Capture, Inc.

Cambridge, MA · Sep 5, 2024
  • Sep 5, 2024 · D · $29,424,989 sold of $30,000,000 · 13 investors · min. No minimum reported · role: Director EDGAR ↗

Raised $29.4M from 13 investors (98% of the $30M target) as of the latest filing. Daniel 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 / 506(b) (18,678 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

VEIR, Inc.

Woburn, MA · May 25, 2023
  • May 25, 2023 · D · $24,902,885 sold of $24,902,885 · 11 investors · min. No minimum reported · role: Director EDGAR ↗

Raised $24.9M from 11 investors (100% of the $24.9M target) as of the latest filing. Daniel 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 / 506(b) (18,678 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.

A
Other Energy · group: Ambri

Ambri Inc.

Marlborough, MA · Dec 28, 2018 → Aug 24, 2021 · 2 filings
  • Aug 24, 2021 · D · $143,761,093 sold of $149,411,093 · 14 investors · min. No minimum reported · role: Executive Officer, Director EDGAR ↗
  • Dec 28, 2018 · D · $17,290,642 sold of $17,290,642 · 5 investors · min. No minimum reported · role: Executive Officer, Director EDGAR ↗

Raised $143.8M from 14 investors (96% of the $149.4M target) as of the latest filing. Daniel is listed as executive officer, 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 Energy / 506(b) (1,000 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 (6)

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

  • Daniel Leff — CO, CA, 9 issuers, Aug 12, 2011 → Apr 5, 2024 · no shared issuer
  • Daniel Leff — DC, 2 issuers, Apr 11, 2019 → Aug 27, 2025 · no shared issuer
  • Daniel Leff — NY, 1 issuer, Aug 20, 2015 → Mar 21, 2016 · no shared issuer
  • Daniel Leff — WA, 1 issuer, May 18, 2018 → May 18, 2018 · no shared issuer
  • Daniel P. Leff — FL, 1 issuer, Mar 18, 2026 → Oct 9, 2026 · no shared issuer
  • Daniel Leff — TX, 1 issuer, Aug 12, 2026 → Aug 12, 2026 · no shared issuer

People around Daniel 21

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

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

David Bradwell

Executive Officer, Director · 4 shared filings (2 issuers)

Listed on the same filings as Daniel Leff. Their page shows their other deals.

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

Adam Briggs

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

Listed on the same filings as Daniel Leff. Their page shows their other deals.

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

Michael Kearney

Director · 2 shared filings (2 issuers) · also on 4 other issuers

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

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

Donald Sadoway

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

Listed on the same filings as Daniel Leff. Their page shows their other deals.

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

Marcelo Kim

Director · 2 shared filings (1 issuer)

Listed on the same filings as Daniel Leff. Their page shows their other deals.

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

Lewis Von Thaer

Director · 2 shared filings (1 issuer)

Listed on the same filings as Daniel Leff. Their page shows their other deals.

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

Duncan Bourgoin

Director · 2 shared filings (1 issuer)

Listed on the same filings as Daniel Leff. Their page shows their other deals.

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

Stephen Keches

Executive Officer · 2 shared filings (1 issuer)

Listed on the same filings as Daniel Leff. Their page shows their other deals.

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

Philip Giudice

Director · 1 shared filing (1 issuer)

Listed on the same filings as Daniel Leff. Their page shows their other deals.

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

Christopher Poirier

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

Listed on the same filings as Daniel Leff. Their page shows their other deals.

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

Patrick Song

Executive Officer · 1 shared filing (1 issuer)

Listed on the same filings as Daniel Leff. Their page shows their other deals.

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

Joshua Posamentier

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

Listed on the same filings as Daniel Leff. Their page shows their other deals.

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

Tim Heidel

Executive Officer, Director · 1 shared filing (1 issuer)

Listed on the same filings as Daniel Leff. Their page shows their other deals.

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

Lou Von Thaer

Director · 1 shared filing (1 issuer)

Listed on the same filings as Daniel Leff. Their page shows their other deals.

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

Navin Wadhwani

Director · 1 shared filing (1 issuer)

Listed on the same filings as Daniel Leff. Their page shows their other deals.

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

Christopher Papagianis

Director · 1 shared filing (1 issuer)

Listed on the same filings as Daniel Leff. Their page shows their other deals.

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

Cameron Halliday

Executive Officer, Director · 1 shared filing (1 issuer)

Listed on the same filings as Daniel Leff. Their page shows their other deals.

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

Krzysztof Zadlo

Director · 1 shared filing (1 issuer)

Listed on the same filings as Daniel Leff. Their page shows their other deals.

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

Hooisweng Ow

Director · 1 shared filing (1 issuer)

Listed on the same filings as Daniel Leff. Their page shows their other deals.

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

Hector MacQuarrie

Director · 1 shared filing (1 issuer)

Listed on the same filings as Daniel Leff. Their page shows their other deals.

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

Danielle Rapson

Executive Officer, Director · 1 shared filing (1 issuer)

Listed on the same filings as Daniel Leff. Their page shows their other deals.

The team behind the deals

A
Sponsor group

Ambri

2 issuers · 6 filings · $154.9M reported sold · 2012–2025
  • A Ambri, Inc. Other Energy · $11.1M sold · 2024 · listed
  • A Ambri Inc. Other Energy · $143.8M sold · 2012 · listed

One team, 2 deal companies. Daniel Leff is listed on 2 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 Daniel Leff.

Same business address

25 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 4 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 Daniel Leff 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 4 issuers this person is listed on — nothing matched.

Public profiles and social

Websites and social links of the issuers Daniel Leff is listed on: none on file. No website or social profile named in Mantel Capture, Inc.'s SEC filings (Form C, Reg A, Form ADV; checked Oct 24, 2026). Web search for this name: #11,672 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 ↗

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 ↗OpenCorporates ↗

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