Ironwood Pharmaceuticals Inc
IRWD- Exchange
- Nasdaq
- Industry
- Pharmaceutical Preparations
- SEC CIK
- 0001446847
No open-market purchases or sales by Ironwood Pharmaceuticals Inc insiders were filed in the last 90 days; 212 institutions reported holding it in 13F filings for Q2 2026, worth $675.8M in total; no superinvestor holds it.
Holders of 5% or more of IRWD
Holders whose latest Schedule 13D or 13G filing reports 5% or more of Ironwood Pharmaceuticals Inc, largest stake first. The change is against the holder's previous filing.
| Holder | Latest form | Stake | Change | First filed | Latest filing | Filing |
|---|---|---|---|---|---|---|
| Armistice Capital, LLC | 13G/A | 9.94%16.1M shares | – | Aug 15, 20251 filing | Aug 15, 2025 | SEC |
| Armistice Capital, LLC | 13G/A | 8.43%13.9M shares | −0.79 ppfrom 9.22% | Nov 14, 20246 filings | Aug 14, 2026 | SEC |
| BlackRock, Inc. | 13G/A | 8.10%13.4M shares | +1.00 ppfrom 7.10% | Oct 23, 20244 filings | Jul 28, 2026 | SEC |
| Sarissa Capital Management LP | 13D/A | 5.80%9.44M shares | – | Mar 1, 20212 filings | Mar 19, 2026 | SEC |
Stakes are as of each holder's latest filing. Holders whose last filing was in the old format (before December 18, 2024) have no stake on record and are not listed, and after an acquisition or delisting holders usually stop filing.
13D and 13G filings
59 Schedule 13D and 13G filings on Ironwood Pharmaceuticals Inc, newest first, including old-format filings without a stake.
| Filed (ET) | Filer | Form | Stake | Change | Event date | Filing |
|---|---|---|---|---|---|---|
| Nov 10, 20268:25 AM ET | State Street Corp | 13G | 4.10%6.72M shares | −1.30 ppfrom 5.40%Below 5% | Sep 30, 2026 | SEC |
| Oct 28, 20261:38 PM ET | Bank of America Corp | 13G/A | 3.20%5.22M shares | −2.90 ppfrom 6.10%Below 5% | Sep 30, 2026 | SEC |
| Aug 14, 202610:19 AM ET | Armistice Capital, LLCand 1 other | 13G/A | 8.43%13.9M shares | −0.79 ppfrom 9.22% | Jun 30, 2026 | SEC |
| Aug 7, 20269:58 AM ET | State Street Corp | 13G | 5.40%8.81M shares | +3.20 ppfrom 2.20% | Jun 30, 2026 | SEC |
| Jul 28, 20264:44 PM ET | BlackRock, Inc. | 13G/A | 8.10%13.4M shares | +1.00 ppfrom 7.10% | Jun 30, 2026 | SEC |
| May 15, 202611:24 AM ET | Armistice Capital, LLCand 1 other | 13G/A | 9.22%15.0M shares | −0.63 ppfrom 9.85% | Mar 31, 2026 | SEC |
| May 14, 20264:45 PM ET | Renaissance Technologies LLCand 1 other | 13G/A | 4.90%8.06M shares | −0.47 ppfrom 5.37%Below 5% | Mar 31, 2026 | SEC |
| Apr 27, 202612:59 PM ET | Bank of America Corp | 13G/A | 6.10%9.96M shares | −1.30 ppfrom 7.40% | Mar 31, 2026 | SEC |
| Mar 27, 20269:51 AM ET | Vanguard Group Inc | 13G/A | 0.00%0 shares | −10.01 ppfrom 10.01%Below 5% | Mar 13, 2026 | SEC |
| Mar 19, 20266:35 PM ET | Sarissa Capital Management LPand 1 other | 13D/A | 5.80%9.44M shares | – | Mar 17, 2026 | SEC |
| Feb 17, 20269:45 PM ET | Armistice Capital, LLCand 1 other | 13G/A | 9.85%16.0M shares | +1.38 ppfrom 8.47% | Dec 31, 2025 | SEC |
| Nov 14, 20251:54 PM ET | Bank of America Corp | 13G | 7.40%12.0M shares | New | Sep 30, 2025 | SEC |
| Nov 12, 20253:34 PM ET | Barclays PLC | 13G/A | 1.95%3.17M shares | −4.93 ppfrom 6.88%Below 5% | Sep 30, 2025 | SEC |
| Aug 15, 202512:26 PM ET | Armistice Capital, LLCand 1 other | 13G/A | 9.94%16.1M shares | – | Jun 30, 2025 | SEC |
| Aug 12, 20255:58 PM ET | Barclays PLC | 13G | 6.88%11.1M shares | New | Jun 30, 2025 | SEC |
| Jul 7, 20251:19 PM ET | Vanguard Group Inc | 13G/A | 10.01%16.2M shares | +0.21 ppfrom 9.80% | Jun 30, 2025 | SEC |
| May 15, 20253:29 PM ET | Armistice Capital, LLCand 1 other | 13G/A | 8.47%13.7M shares | +2.55 ppfrom 5.92% | Mar 31, 2025 | SEC |
| May 13, 202511:32 AM ET | State Street Corp | 13G | 2.20%3.50M shares | −3.00 ppfrom 5.20%Below 5% | Mar 31, 2025 | SEC |
| May 2, 202511:13 AM ET | Pacer Advisors, Inc.and 3 others | 13G/A | 1.12%1.79M shares | −6.20 ppfrom 7.32%Below 5% | Mar 31, 2025 | SEC |
| May 2, 202510:42 AM ET | Pacer Advisors, Inc.and 3 others | 13G | 7.32%11.7M shares | New | Dec 31, 2024 | SEC |
| Apr 30, 202511:22 AM ET | Vanguard Group Inc | 13G/A | 9.80%15.7M shares | −2.40 ppfrom 12.20% | Mar 31, 2025 | SEC |
| Mar 7, 202512:19 PM ET | BlackRock, Inc. | 13G/A | 7.10%11.3M shares | – | Feb 28, 2025 | SEC |
| Feb 14, 20255:49 PM ET | Armistice Capital, LLCand 1 other | 13G/A | 5.92%9.47M shares | – | Dec 31, 2024 | SEC |
| Feb 5, 20257:27 AM ET | State Street Corp | 13G | 5.20%8.33M shares | – | Dec 31, 2024 | SEC |
| Jan 31, 202511:44 AM ET | Vanguard Group Inc | 13G/A | 12.20%19.5M shares | – | Dec 31, 2024 | SEC |
| Nov 14, 2024 | Armistice Capital, LLC | 13GOld format | – | New | – | SEC |
| Nov 13, 20242:41 PM ET | Renaissance Technologies LLCand 1 other | 13G | 5.37%8.60M shares | New | May 15, 2024 | SEC |
| Nov 12, 2024 | Vanguard Group Inc | 13G/AOld format | – | – | – | SEC |
| Nov 8, 2024 | BlackRock, Inc. | 13G/AOld format | – | – | – | SEC |
| Nov 4, 2024 | Vanguard Group Inc | 13G/AOld format | – | – | – | SEC |
| Oct 23, 2024 | BlackRock, Inc. | 13G/AOld format | – | – | – | SEC |
| Oct 16, 2024 | State Street Corp | 13G/AOld format | – | – | – | SEC |
| Feb 9, 2024 | LSV Asset Management | 13G/AOld format | – | – | – | SEC |
| Jan 25, 2024 | State Street Corp | 13G/AOld format | – | – | – | SEC |
| Jan 22, 20242:03 PM ET | BlackRock Inc. | 13G/AOld format | – | – | – | SEC |
| Jan 10, 2024 | Vanguard Group Inc | 13G/AOld format | – | – | – | SEC |
| Jul 5, 2023 | Westfield Capital Management Co LP | 13G/AOld format | – | – | – | SEC |
| May 10, 2023 | Wellington Management Group LLP | 13G/AOld format | – | – | – | SEC |
| Feb 14, 2023 | Brown Capital Management LLC | 13G/AOld format | – | – | – | SEC |
| Feb 10, 2023 | LSV Asset Management | 13GOld format | – | New | – | SEC |
| Feb 9, 2023 | Vanguard Group Inc | 13G/AOld format | – | – | – | SEC |
| Feb 6, 2023 | Wellington Management Group LLP | 13G/AOld format | – | – | – | SEC |
| Feb 2, 2023 | State Street Corp | 13GOld format | – | New | – | SEC |
| Jan 26, 20238:52 AM ET | BlackRock Inc. | 13G/AOld format | – | – | – | SEC |
| Jan 20, 20235:17 PM ET | BlackRock Inc. | 13G/AOld format | – | – | – | SEC |
| Jul 8, 20224:57 PM ET | BlackRock Inc. | 13GOld format | – | – | – | SEC |
| Feb 14, 2022 | Brown Capital Management LLC | 13G/AOld format | – | – | – | SEC |
| Feb 10, 2022 | Vanguard Group Inc | 13G/AOld format | – | – | – | SEC |
| Feb 4, 2022 | Wellington Management Group LLP | 13G/AOld format | – | – | – | SEC |
| Feb 2, 20227:11 PM ET | BlackRock Inc. | 13G/AOld format | – | – | – | SEC |
Form 144: proposed insider sales
44 notices from officers, directors and other affiliates planning to sell Ironwood Pharmaceuticals Inc shares, newest first.
| Filed (ET) | Seller | Shares to sell | Market value | Planned sale | Broker | Filing |
|---|---|---|---|---|---|---|
| Sep 23, 20264:08 PM ET | Shetzline MichaelFormer officer | 83.3K | $377.4K | Sep 24, 2026 | E Trade Securities LLC | SEC |
| Jul 7, 20264:43 PM ET | Ronald SilverOfficer | 127.9K | $560.2K | Jul 7, 202610b5-1 | Morgan Stanley Smith Barney LLC Executive Financial Services | SEC |
| Jun 16, 20264:37 PM ET | Julie McHughDirector | 21.6K | $79.6K | Jun 16, 202610b5-1 | Morgan Stanley Smith Barney LLC Executive Financial Services | SEC |
| Feb 20, 20264:46 PM ET | Gaskins Tammi LOfficer | 19.8K | $91.2K | Feb 23, 2026 | E Trade Securities LLC | SEC |
| Feb 20, 20264:45 PM ET | Martini Gregory S.Officer | 20.2K | $93.0K | Feb 23, 2026 | E Trade Securities LLC | SEC |
| Feb 20, 20264:44 PM ET | Shetzline MichaelOfficer | 29.9K | $138.0K | Feb 23, 2026 | E Trade Securities LLC | SEC |
| Feb 20, 20264:42 PM ET | John MinardoOfficer | 33.5K | $154.6K | Feb 23, 2026 | E Trade Securities LLC | SEC |
| Feb 20, 20264:41 PM ET | MCCOURT Thomas AOfficer · Director | 182.2K | $839.9K | Feb 23, 2026 | E Trade Securities LLC | SEC |
| Jan 5, 20264:41 PM ET | Ronald SilverOfficer | 35.4K | $151.2K | Jan 5, 202610b5-1 | Morgan Stanley Smith Barney LLC Executive Financial Services | SEC |
| Nov 14, 20254:05 PM ET | Gaskins Tammi LOfficer | 6.32K | $21.3K | Nov 17, 2025 | E Trade Securities LLC | SEC |
| Aug 8, 20254:10 PM ET | John MinardoOfficer | 8.28K | $7.29K | Aug 11, 2025 | E Trade Securities LLC | SEC |
| Aug 8, 20254:09 PM ET | Martini Gregory S.Officer | 1.35K | $1.19K | Aug 11, 2025 | E Trade Securities LLC | SEC |
| Aug 8, 20254:08 PM ET | Gaskins Tammi LOfficer | 1.41K | $1.24K | Aug 11, 2025 | E Trade Securities LLC | SEC |
| May 16, 20254:07 PM ET | MCCOURT Thomas AOfficer · Director | 14.7K | $8.65K | May 19, 2025 | ETrade Securities LLC | SEC |
| May 16, 20254:05 PM ET | Gaskins Tammi LOfficer | 2.81K | $1.66K | May 19, 2025 | ETrade Securities LLC | SEC |
| Feb 7, 20254:21 PM ET | MCCOURT Thomas AOfficer · Director | 142.5K | $276.4K | Feb 10, 2025 | E Trade Securities LLC | SEC |
| Feb 7, 20254:20 PM ET | Shetzline MichaelOfficer | 42.3K | $82.0K | Feb 10, 2025 | E Trade Securities LLC | SEC |
| Feb 7, 20254:18 PM ET | John MinardoOfficer | 39.9K | $77.4K | Feb 10, 2025 | E Trade Securities LLC | SEC |
| Feb 7, 20254:17 PM ET | Martini Gregory S.Officer | 12.3K | $24.0K | Feb 10, 2025 | E Trade Securities LLC | SEC |
| Dec 27, 20244:43 PM ET | Davis AndrewOfficer | 60.4K | $241.7K | Dec 27, 2024 | MORGAN STANLEY SMITH BARNEY LLC EXECUTIVE SERVICES | SEC |
| Nov 15, 20244:10 PM ET | Davis AndrewOfficer | 6.09K | $25.0K | Nov 18, 2024 | E Trade Securities LLC | SEC |
| Nov 15, 20244:07 PM ET | Emany Sravan KumarOfficer | 12.5K | $51.4K | Nov 18, 2024 | E Trade Securities LLC | SEC |
| Aug 9, 20244:05 PM ET | John MinardoOfficer | 11.7K | $47.5K | Aug 12, 2024 | E Trade Securities LLC | SEC |
| Jun 10, 20244:57 PM ET | Julie McHughDirector | 22.8K | $144.6K | Jun 10, 202410b5-1 | Morgan Stanley Smith Barney LLC Executive Financial Services | SEC |
| Jun 7, 20241:35 PM ET | Moukheibir CatherineDirector | 35.6K | $234.8K | Jun 7, 2024 | Merrill Lynch | SEC |
Showing the latest 25. See the IRWD notices from the last 12 months