PartnerFacts
Data last updated: Oct 23, 2026, 5:45 PM ETLatest filing: Oct 22, 2026Now: Oct 24, 2026, 9:19 AM ET

Sponsor Check › Person

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

Jonathan Violin

Named as an officer, director or promoter on SEC Form D filings · PA, MA, CO · Aug 1, 2019 → Apr 21, 2022

6deals (issuers)
$407Mreported sold
80investors
13Form D filings
2019–2022years on file
Follow this personLook further ↓PDF

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

The short version

Jonathan Violin is listed as an executive officer and director on 13 SEC Form D filings by 6 issuers between Dec 2018 and Apr 2022. Largest by amount reported sold: CATABASIS PHARMACEUTICALS INC (Boston, MA — pharmaceuticals — 2021; $175.7M reported sold to 23 investors), Dianthus Therapeutics, Inc. (Waltham, MA — biotechnology — 2019–2022; $100M reported sold to 22 investors), MIRAGEN THERAPEUTICS, INC. (Boulder, CO — biotechnology — 2020; $91M reported sold to 22 investors), Viridian Therapeutics, Inc. (Waltham, MA — biotechnology — 2020; $27M reported sold to 9 investors), Quellis Biosciences, Inc. (Waltham, MA — biotechnology — 2020; $12.1M reported sold to 3 investors) and 1 more (all listed below).

What this means A repeat sponsor — 6 separate companies raised money with this person listed as executive officer and director, over about 4 years. Across those companies the filings report $407M sold in total.

Listed alongside Tomas Kiselak (6 shared filings), Leon O. Moulder, Jr. (5 shared filings), Peter Harwin (4 shared filings), Kenneth Evan Thompson (3 shared filings), Andrew Komjathy (2 shared filings) and 22 others.

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

The issuers belong to 2 sponsor groups: Fairmount Healthcare (15 issuers, $1.85B reported sold, 2016–2026) and Miragen Therapeutics (2 issuers, $131.7M reported sold, 2009–2020).

What this means This person is listed across more than one sponsor team; each group page shows that team's full track record.

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, 3 bankruptcy cases matching the name listed in Key records below.

What this means 8 records came back. 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 13 public filings for Jonathan Violin and found 10 differences, 2 worth asking the sponsor about: Bankruptcy case: Violin Memory, Inc; 5 court cases name Jonathan Violin; 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 Jonathan Violin has not run yet — it is joining a line of 30,655 names; searches run around the clock at the hosts' allowed rate. Searched so far: 638 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: 2 closed (disposition not in docket feed), 2 dismissed, 1 judgment

Richards v. Violin Memory, Inc. closed
District Court, N.D. California · No. 4:13-cv-05834 · Filed Dec 17, 2013 · Closed Feb 13, 2014 · Nature of suit: 850 Securities/Commodities · Cause: 15:77 Securities Fraud
Role of Violin Memory, Inc.: Defendant · Outcome: Terminated 2014-02-13 — FJC Integrated Database disposition: Statistical closing Docket on CourtListener ↗
same rare surname (2 people in Form D filings, 12 federal dockets); surname only in the caption; court in CA (not a filing state)
McBrian v. Violin Memory, Inc. closed
District Court, N.D. California · No. 4:13-cv-05610 · Filed Dec 4, 2013 · Closed Feb 13, 2014 · Nature of suit: 850 Securities/Commodities · Cause: 15:77 Securities Fraud
Role of Violin Memory, Inc.: Defendant · Outcome: Terminated 2014-02-13 — FJC Integrated Database disposition: Statistical closing Docket on CourtListener ↗
same rare surname (2 people in Form D filings, 12 federal dockets); surname only in the caption; court in CA (not a filing state)
Schneider v. Violin Memory, Inc. dismissed
District Court, N.D. California · No. 4:13-cv-05515 · Filed Nov 27, 2013 · Closed Feb 13, 2014 · Nature of suit: 850 Securities/Commodities · Cause: 15:78m(a) Securities Exchange Act
Role of Violin Memory, Inc.: Defendant · Outcome: Terminated 2014-02-13 — FJC Integrated Database disposition: Dismissed: other Docket on CourtListener ↗
same rare surname (2 people in Form D filings, 12 federal dockets); surname only in the caption; court in CA (not a filing state)
In re Violin Memory Inc. Securities Litigation judgment
District Court, N.D. California · No. 4:13-cv-05486 · Filed Nov 26, 2013 · Closed Jul 28, 2016 · Nature of suit: 850 Securities/Commodities · Cause: 15:77 Securities Fraud
Role of Violin Memory Inc. Securities Litigation: Party · Outcome: Terminated 2016-07-28 — FJC Integrated Database disposition: Judgment on motion before trial; judgment for plaintiff Docket on CourtListener ↗
same rare surname (2 people in Form D filings, 12 federal dockets); surname only in the caption; court in CA (not a filing state)
Narada Systems, LLC v. Violin Memory, Inc. dismissed
District Court, E.D. Texas · No. 6:12-cv-00005 · Filed Jan 5, 2012 · Closed Oct 12, 2012 · Nature of suit: 480 Consumer credit
Role of Violin Memory, Inc.: Defendant · Outcome: Terminated 2012-10-12 — FJC Integrated Database disposition: Dismissed: other Docket on CourtListener ↗
same rare surname (2 people in Form D filings, 12 federal dockets); surname only in the caption; court in TX (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, 2:45 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 Jonathan Violin..

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

3 cases: 3 closed (disposition not in docket feed)

Gold Violin LLC closed
United States Bankruptcy Court, D. Delaware · No. 20-10571 · Filed Mar 9, 2020 · Closed Aug 31, 2020
Role of Gold Violin LLC: Debtor · Outcome: Case closed 2020-08-31 (disposition not included in the bulk docket feed — see docket) Docket on CourtListener ↗
same rare surname (2 people in Form D filings, 12 federal dockets); different first name (gold); court in DE (not a filing state)
Violin Memory, Inc. closed
United States Bankruptcy Court, D. Delaware · No. 16-12782 · Filed Dec 14, 2016 · Closed Feb 16, 2018
Role of Violin Memory, Inc.: Debtor · Outcome: Case closed 2018-02-16 (disposition not included in the bulk docket feed — see docket) Docket on CourtListener ↗
same rare surname (2 people in Form D filings, 12 federal dockets); surname only in the caption; court in DE (not a filing state)
Gold Violin LLC closed
United States Bankruptcy Court, D. Delaware · No. 11-10174 · Filed Jan 19, 2011 · Closed Mar 29, 2012
Role of Gold Violin LLC: Debtor · Outcome: Case closed 2012-03-29 (disposition not included in the bulk docket feed — see docket) Docket on CourtListener ↗
same rare surname (2 people in Form D filings, 12 federal dockets); different first name (gold); court in DE (not a filing state)
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, 2:45 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.

4. Differences between public sources

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

10 differences found between the filings for Jonathan Violin — 2 worth asking about (compared 13 filings on Oct 24, 2026)

Worth asking · Dec 14, 2016 – Feb 16, 2018

Bankruptcy case: Violin Memory, Inc. — filed Dec 14, 2016

United States Bankruptcy Court, D. Delaware docket "Violin Memory, Inc." filed Dec 14, 2016, closed Feb 16, 2018. Jonathan Violin is listed as Debtor ("Violin Memory, Inc."). Our match estimate: 40%.

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. Delaware ↗
Sources
Worth asking · Jan 5, 2012 – Dec 17, 2013

5 court cases name Jonathan Violin — 4 as defendant

By role: defendant in 4, party in 1. Newest: "Richards v. Violin Memory, Inc." (District Court, N.D. California, Dec 17, 2013); "McBrian v. Violin Memory, Inc." (District Court, N.D. California, Dec 4, 2013); "Schneider v. Violin Memory, Inc." (District Court, N.D. California, Nov 27, 2013). 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 · Richards v. Violin Memory, Inc. ↗Docket · McBrian v. Violin Memory, Inc. ↗Docket · Schneider v. Violin Memory, Inc. ↗Docket · In re Violin Memory Inc. Securities Litigation ↗
Sources
Note · Dec 13, 2018

Jonathan Violin appears on 1 deal that stopped filing before reaching its target

Viridian, LLC (last filing Dec 13, 2018; $1,150,000 sold of $3,000,000). Each has no filing in more than two years and reported under half its target sold.

What this means An issuer whose last filing is more than two years old and reported under half its target sold. The raise may have closed early or quietly stopped. Ask what happened to each.

Viridian, LLC — PartnerFacts page ↗
Sources
Note · Nov 27, 2018 – Jun 7, 2021

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 — Dianthus Therapeutics, Inc. (latest filing Jun 7, 2021) · No amendment in the last 12 months on an offering that may still be open — Quellis Biosciences, Inc. (latest filing Dec 28, 2020) · No amendment in the last 12 months on an offering that may still be open — Dianthus Therapeutics, Inc. (latest filing Dec 16, 2020) · No amendment in the last 12 months on an offering that may still be open — Quellis Biosciences, Inc. (latest filing Aug 18, 2020) · No amendment in the last 12 months on an offering that may still be open — Viridian Therapeutics, Inc. (latest filing May 8, 2020) · 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 · Jun 7, 2021 ↗Dianthus Therapeutics, Inc. — PartnerFacts page ↗Form D · Dec 28, 2020 ↗Quellis Biosciences, Inc. — PartnerFacts page ↗
Sources
Note · Jun 7, 2021 – Apr 21, 2022

Jonathan Violin's role changed at Dianthus Therapeutics, Inc.: executive officer, director → director

The Jun 7, 2021 filing lists Jonathan Violin as executive officer, director; the Apr 21, 2022 Form D 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 · Jun 7, 2021 ↗Form D · Apr 21, 2022 ↗Jonathan Violin — PartnerFacts page ↗Dianthus Therapeutics, Inc. — PartnerFacts page ↗
Sources
Note · Aug 1, 2019 – Dec 16, 2020

Offering amount changed between filings — Dianthus Therapeutics, Inc.

The Aug 1, 2019 filing says $3,500,000 offered; the Dec 16, 2020 Form D/A says $7,000,000.

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 1, 2019 ↗Form D/A (later) · Dec 16, 2020 ↗Dianthus Therapeutics, Inc. — PartnerFacts page ↗
Sources
Note · Dec 11, 2018 – Aug 18, 2020

Offering amount changed between filings — Quellis Biosciences, Inc.

The Dec 11, 2018 filing says $18,518,047 offered; the Aug 18, 2020 Form D/A says $18,519,814.

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) · Dec 11, 2018 ↗Form D/A (later) · Aug 18, 2020 ↗Quellis Biosciences, Inc. — PartnerFacts page ↗
Sources
Note · Aug 1, 2019 – Dec 16, 2020

Address moved from Miromar Lakes, FL to Waltham, MA — Dianthus Therapeutics, Inc.

The people listed on the Aug 1, 2019 filing give Miromar Lakes, FL; on the Dec 16, 2020 filing they give Waltham, 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 · Aug 1, 2019 ↗Form D/A · Dec 16, 2020 ↗Dianthus Therapeutics, Inc. — PartnerFacts page ↗
Sources
Note · Dec 11, 2018 – Aug 18, 2020

Address moved from Philadelphia, PA to Waltham, MA — Quellis Biosciences, Inc.

The people listed on the Dec 11, 2018 filing give Philadelphia, PA; on the Aug 18, 2020 filing they give Waltham, 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 · Dec 11, 2018 ↗Form D/A · Aug 18, 2020 ↗Quellis Biosciences, Inc. — PartnerFacts page ↗
Sources
Note · Dec 13, 2018 – Apr 21, 2022

Jonathan Violin is listed with 3 different address states: PA, MA, CO

PA on 1 filing (Dec 13, 2018); MA on 11 filings (Aug 1, 2019 to Apr 21, 2022); CO on 1 filing (Nov 6, 2020).

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 · Dec 13, 2018 ↗Form D · Aug 1, 2019 ↗Form D · Nov 6, 2020 ↗
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 12 offerings report sales commissions totalling $8,500,528; 1 reports finder's fees totalling $4,549,866; 0 report proceeds to related persons.

Offering (latest filing)Sales commissionsFinder's feesTo insidersPaid to sell itSource
Apr 21, 2022 D
Dianthus Therapeutics, Inc.
File 021-442826
$3,000,000$0$0Jefferies LLC BrokerCheck CRD 2347 ↗
via Jefferies LLC (CRD 2347 ↗)
EDGAR ↗
Jun 7, 2021 D
Dianthus Therapeutics, Inc.
File 021-401968
$0$0$0None listed on this filingEDGAR ↗
Apr 29, 2021 D
Dianthus Therapeutics, Inc.
File 021-397658
$0$0$0None listed on this filingEDGAR ↗
Feb 8, 2021 D
CATABASIS PHARMACEUTICALS INC
File 021-388812
$0$0$0None listed on this filingEDGAR ↗
Feb 8, 2021 D
CATABASIS PHARMACEUTICALS INC
File 021-388817
$5,500,528$0$0Jefferies LLC BrokerCheck CRD 2347 ↗EDGAR ↗
Dec 28, 2020 D
Quellis Biosciences, Inc.
File 021-384402
$0$0$0None listed on this filingEDGAR ↗
Dec 16, 2020 D/A
Dianthus Therapeutics, Inc.
File 021-345590
$0$0$0None listed on this filingEDGAR ↗
Nov 6, 2020 D
MIRAGEN THERAPEUTICS, INC.
File 021-379997
$0$4,549,866$0Jefferies LLC BrokerCheck CRD 2347 ↗
JMP Securities LLC BrokerCheck CRD 22208 ↗		EDGAR ↗
Sep 29, 2020 D
Viridian Therapeutics, Inc.
File 021-376545
$0$0$0None listed on this filingEDGAR ↗
Aug 18, 2020 D/A
Quellis Biosciences, Inc.
File 021-327586
$0$0$0None listed on this filingEDGAR ↗
May 8, 2020 D
Viridian Therapeutics, Inc.
File 021-366547
$0$0$0None listed on this filingEDGAR ↗
Dec 13, 2018 D
Viridian, LLC
File 021-327913
$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 6

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

DT
Biotechnology

Dianthus Therapeutics, Inc.

Waltham, MA · Aug 1, 2019 → Apr 21, 2022 · 5 filings
  • Apr 21, 2022 · D · $100,000,000 sold of $100,000,000 · 22 investors · min. No minimum reported · role: Director EDGAR ↗
  • Jun 7, 2021 · D · $14,999,996 sold of $15,000,000 · 6 investors · min. No minimum reported · role: Executive Officer, Director EDGAR ↗
  • Apr 29, 2021 · D · $7,722 sold of $7,722 · 1 investors · min. No minimum reported · role: Executive Officer, Director EDGAR ↗
  • Dec 16, 2020 · D/A · $6,500,000 sold of $7,000,000 · 6 investors · min. No minimum reported · role: Executive Officer, Director (Jonathan Violin fills the role of executive officer by serving as President of the Company.) EDGAR ↗
  • Aug 1, 2019 · D · $1,642,500 sold of $3,500,000 · 2 investors · min. No minimum reported · role: Executive Officer, Director EDGAR ↗

Raised $100M from 22 investors (100% of the $100M target) as of the latest filing. Jonathan is listed as director, executive officer 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: 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.

CP
Pharmaceuticals

CATABASIS PHARMACEUTICALS INC

Boston, MA · Feb 8, 2021 → Feb 8, 2021 · 2 filings
  • Feb 8, 2021 · D · $110,010,570 sold of $110,010,570 · 23 investors · min. No minimum reported · role: Director EDGAR ↗
  • Feb 8, 2021 · D · $175,738,599 sold of $175,738,599 · 6 investors · min. No minimum reported · role: Director EDGAR ↗

Raised $175.7M from 23 investors (100% of the $110M target) as of the latest filing. Jonathan 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: Pharmaceuticals / 506(b) (800 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.

QB
Biotechnology

Quellis Biosciences, Inc.

Waltham, MA · Aug 18, 2020 → Dec 28, 2020 · 2 filings
  • Dec 28, 2020 · D · $0 sold of $1,021,981 · 1 investors · min. No minimum reported · role: Executive Officer, Director (Jonathan Violin fills the role of executive officer by serving as President of the Company.) EDGAR ↗
  • Aug 18, 2020 · D/A · $12,068,212 sold of $18,519,814 · 3 investors · min. No minimum reported · role: Executive Officer, Director EDGAR ↗

Raised $12.1M from 3 investors (100% of the $1.02M target) as of the latest filing. Jonathan 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: 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.

MT
Biotechnology · group: Miragen Therapeutics

MIRAGEN THERAPEUTICS, INC.

Boulder, CO · Nov 6, 2020
  • Nov 6, 2020 · D · $90,997,328 sold of $90,997,328 · 22 investors · min. No minimum reported · role: Executive Officer EDGAR ↗

Raised $91M from 22 investors (100% of the $91M target) as of the latest filing. Jonathan 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. "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.

VT
Biotechnology · group: Fairmount Healthcare

Viridian Therapeutics, Inc.

Waltham, MA · May 8, 2020 → Sep 29, 2020 · 2 filings
  • Sep 29, 2020 · D · $27,000,000 sold of $27,000,000 · 9 investors · min. No minimum reported · role: Executive Officer, Director EDGAR ↗
  • May 8, 2020 · D · $2,000,000 sold of $5,000,000 · 2 investors · min. No minimum reported · role: Executive Officer, Director EDGAR ↗

Raised $27M from 9 investors (100% of the $27M target) as of the latest filing. Jonathan 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: 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
Biotechnology · group: Fairmount Healthcare

Viridian, LLC

Philadelphia, PA · Dec 13, 2018
  • Dec 13, 2018 · D · $1,150,000 sold of $3,000,000 · 1 investors · min. No minimum reported · role: Executive Officer (Manager and Chief Executive Officer) EDGAR ↗

Raised $1.15M from 1 investor (38% of the $3M target) as of the latest filing. Jonathan 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. "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.

People around Jonathan 27

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

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

Tomas Kiselak

Executive Officer, Director · 6 shared filings (4 issuers) · also on 16 other issuers

Tomas Kiselak is on 20 issuers in total — a repeat sponsor. Their page lists every one.

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

Leon O. Moulder, Jr.

Director · 5 shared filings (1 issuer) · also on 6 other issuers

Leon O. Moulder, Jr. is on 7 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 Harwin

Executive Officer, Director · 4 shared filings (3 issuers) · also on 17 other issuers

Peter Harwin is on 20 issuers in total — a repeat sponsor. Their page lists every one.

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

Kenneth Evan Thompson

Executive Officer · 3 shared filings (1 issuer)

Listed on the same filings as Jonathan Violin. Their page shows their other deals.

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

Jill Milne

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

Listed on the same filings as Jonathan Violin. Their page shows their other deals.

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 Jonathan Violin. Their page shows their other deals.

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

Christopher Garabedian

Director · 2 shared filings (1 issuer)

Listed on the same filings as Jonathan Violin. Their page shows their other deals.

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

Frederick Callori

Director · 2 shared filings (1 issuer) · also on 4 other issuers

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

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

Hugh Cole

Director · 2 shared filings (1 issuer)

Listed on the same filings as Jonathan Violin. Their page shows their other deals.

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

Joanne Donovan

Executive Officer · 2 shared filings (1 issuer)

Listed on the same filings as Jonathan Violin. Their page shows their other deals.

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

Andrew Nichols

Executive Officer · 2 shared filings (1 issuer)

Listed on the same filings as Jonathan Violin. Their page shows their other deals.

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

Andrew Komjathy

Executive Officer · 2 shared filings (1 issuer)

Listed on the same filings as Jonathan Violin. Their page shows their other deals.

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

Michael D. Kishbauch

Director · 2 shared filings (1 issuer)

Listed on the same filings as Jonathan Violin. Their page shows their other deals.

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

Joanne T. Beck

Director · 2 shared filings (1 issuer)

Listed on the same filings as Jonathan Violin. Their page shows their other deals.

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

Gregg Lapointe

Director · 2 shared filings (1 issuer)

Listed on the same filings as Jonathan Violin. Their page shows their other deals.

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

Fred Callori

Director · 2 shared filings (1 issuer)

Listed on the same filings as Jonathan Violin. Their page shows their other deals.

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

Noah Clauser

Executive Officer · 2 shared filings (1 issuer)

Listed on the same filings as Jonathan Violin. Their page shows their other deals.

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

Ben Harshbarger

Executive Officer · 2 shared filings (1 issuer)

Listed on the same filings as Jonathan Violin. Their page shows their other deals.

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

Lee Rauch

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

Listed on the same filings as Jonathan Violin. Their page shows their other deals.

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

Arlene Morris

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

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

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

Paula Soteropoulos

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

Listed on the same filings as Jonathan Violin. Their page shows their other deals.

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

Jeffrey S. Hatfield

Director · 1 shared filing (1 issuer)

Listed on the same filings as Jonathan Violin. Their page shows their other deals.

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

Joesph L. Turner

Director · 1 shared filing (1 issuer)

Listed on the same filings as Jonathan Violin. Their page shows their other deals.

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

Diana Escolar

Executive Officer · 1 shared filing (1 issuer)

Listed on the same filings as Jonathan Violin. Their page shows their other deals.

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

Lei Meng

Director · 1 shared filing (1 issuer)

Listed on the same filings as Jonathan Violin. Their page shows their other deals.

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

Marino Garcia

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

Listed on the same filings as Jonathan Violin. Their page shows their other deals.

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

Jason Leverone

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

Listed on the same filings as Jonathan Violin. Their page shows their other deals.

The team behind the deals

FH
Sponsor group

Fairmount Healthcare

15 issuers · 39 filings · $1.85B reported sold · 2016–2026

One team, 15 deal companies. Jonathan Violin 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 Jonathan Violin.

MT
Sponsor group

Miragen Therapeutics

2 issuers · 13 filings · $131.7M reported sold · 2009–2020

One team, 2 deal companies. Jonathan Violin is listed on 1 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 Jonathan Violin.

Same business address

10 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); 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 6 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 Jonathan Violin 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 6 issuers this person is listed on — nothing matched.

Public profiles and social

Websites and social links of the issuers Jonathan Violin is listed on: none on file. No website or social profile named in CATABASIS PHARMACEUTICALS INC's SEC filings (Form C, Reg A, Form ADV; checked Oct 24, 2026). Web search for this name: #199,115 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 (Boston, 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) ↗Pennsylvania UJS portal case search ↗Massachusetts MassCourts ↗Colorado state courts — find the court ↗

Securities regulators

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

Business registries

Pennsylvania Secretary of State business search ↗Massachusetts Secretary of State business search ↗Colorado 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 Jonathan Violin appears on a new Form D, or when a court case or SEC action is matched to them. See plans →