Ironwood Pharmaceuticals Inc
IRWD- Exchange
- Nasdaq
- Industry
- Pharmaceutical Preparations
- SEC CIK
- 0001446847
In the last 90 days, Ironwood Pharmaceuticals Inc insiders filed 0 open-market purchases and 1 sale; 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 |
|---|---|---|---|---|---|---|
| Vanguard Group Inc | 13G/A | 10.01%16.2M shares | +0.21 ppfrom 9.80% | Jan 31, 20253 filings | Jul 7, 2025 | SEC |
| Armistice Capital, LLC | 13G/A | 9.94%16.1M shares | +1.47 ppfrom 8.47% | Feb 14, 20253 filings | Aug 15, 2025 | SEC |
| Bank of America Corp | 13G | 7.40%12.0M shares | New | Nov 14, 20251 filing | Nov 14, 2025 | SEC |
| BlackRock, Inc. | 13G/A | 7.10%11.3M shares | – | Mar 7, 20251 filing | Mar 7, 2025 | SEC |
| Barclays PLC | 13G | 6.88%11.1M shares | New | Aug 12, 20251 filing | Aug 12, 2025 | SEC |
| Renaissance Technologies LLC | 13G | 5.37%8.60M shares | New | Nov 13, 20241 filing | Nov 13, 2024 | 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
14 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 14, 20251:54 PM ET | Bank of America Corp | 13G | 7.40%12.0M shares | New | Sep 30, 2025 | SEC |
| Aug 15, 202512:26 PM ET | Armistice Capital, LLCand 1 other | 13G/A | 9.94%16.1M shares | +1.47 ppfrom 8.47% | 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 | New | 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 13, 20242:41 PM ET | Renaissance Technologies LLCand 1 other | 13G | 5.37%8.60M shares | New | May 15, 2024 | SEC |
Form 144: proposed insider sales
Notices from officers, directors and other affiliates planning to sell Ironwood Pharmaceuticals Inc shares.
No Form 144 notices for Ironwood Pharmaceuticals Inc are on file.