Latest Period
Q1 2026
Security Snapshot
IRONWOOD PHARMACEUTICALS INC - Class A Stock (IRWD) Institutional Ownership
CUSIP: 46333X108
13F Institutional Holders and Ownership History from Q1 2014 to Q2 2026
Institutions Reporting
225
Shares (Excl. Options)
161,460,100
Price
$3.51
Save this security page for your next review
Keep this CUSIP in your watchlists so you can revisit quarter changes from one place. If you create an account from here, we will bring you back after verification.
- Security type / class
- Equity / Class A Stock
- Symbol
- IRWD on Nasdaq
- All holders as of 31 Mar 2026
- Q1 2026
- Total 13F shares
- 161,460,100
- Total 13F value
- $566,652,208
- Portfolio coverage rank
- 0%
- Share change
- +8,481,977
- Value change
- +$30,591,294
- Number of holders
- 225
- Shares outstanding
- 165,105,778
- SEC-reported price per share
- $4.21
- Insider filing price
- $4.21
Latest holder snapshot
5 signals
Issuer context
Names, identifiers, and filing context for this profile.
3 identity fields
13F Shares, Excluding Options vs Price
13F Value, Excluding Options
Total Investors
Key facts
- IRWD - IRONWOOD PHARMACEUTICALS INC - Class A Stock is tracked under CUSIP 46333X108.
- 225 institutions reported positions in Q1 2026.
- 9 significant owners is listed from Schedule 13D/13G reporting.
Change
- Holder count moved from 225 to 43 between Q1 2026 and Q2 2026.
- SEC-reported value moved from $566,652,208 to $8,428,935.
Research use
- You can quickly see who holds this security, then open quarter and manager detail pages for full evidence.
- 13F and Schedule 13D/13G sections are kept together so you can cross-check institutional and beneficial ownership context.
Evidence
Source: SEC Form 13F
Open SEC evidence
Latest holder context comes from 225 institutions filings for Q1 2026.
Security key
46333X108
Latest holder period
Q1 2026
13F holders
225
13D/G owners
9
CIK / CUSIP context first
Open Q1 2026 holders
IRWD full holder history
IRONWOOD PHARMACEUTICALS INC SEC filings
IRONWOOD PHARMACEUTICALS INC company facts
IRONWOOD PHARMACEUTICALS INC insider transactions
Broader feeds
Recent Quarterly Holder Reports
Open recent reporting periods for CUSIP 46333X108:
13D/G owners
Significant owners
Large-stake holder rows connected to Schedule 13D/G evidence.
Rows
9
Security
IRWD
| Filer | Ownership | Change % | Holdings Value | Net Change | Nb Shares | Change % | Reporting Name | Report Period |
|---|---|---|---|---|---|---|---|---|
| VANGUARD GROUP INC | 10% | +2.1% | $10,855,426 | +$338,999 | 16,202,129 | +3.2% | The Vanguard Group | 30 Jun 2025 |
| ARMISTICE CAPITAL, LLC | 9.8% | +17% | $82,368,500 | +$11,950,500 | 16,025,000 | +17% | Armistice Capital, LLC | 31 Dec 2025 |
| BlackRock, Inc. | 8.1% | +14% | $56,302,721 | +$8,795,401 | 13,373,568 | +19% | BlackRock, Inc. | 30 Jun 2026 |
| BANK OF AMERICA CORP /DE/ | 6.1% | -19% | $34,967,866 | -$7,103,931 | 9,962,355 | -17% | BANK OF AMERICA CORP /DE/ | 31 Mar 2026 |
| Sarissa Capital Management LP | 5.8% | $31,735,012 | 9,444,944 | Alexander J. Denner | 17 Mar 2026 | |||
| RENAISSANCE TECHNOLOGIES LLC | 5.4% | $7,565,534 | 8,597,198 | Renaissance Technologies LLC | 15 May 2024 | |||
| STATE STREET CORP | 2.2% | -60% | $3,078,494 | -$4,250,865 | 3,498,289 | -58% | STATE STREET CORPORATION | 31 Mar 2025 |
| BARCLAYS PLC | 2% | -70% | $4,149,704 | -$10,435,649 | 3,167,713 | -72% | Barclays PLC | 30 Sep 2025 |
| Pacer Advisors, Inc. | 1.1% | -89% | $1,574,406 | -$8,748,672 | 1,789,098 | -85% | Pacer US Small Cap Cash Cows ETF | 31 Mar 2025 |
As of 31 Mar 2026, 225 institutional investors reported holding 161,460,100 shares of IRONWOOD PHARMACEUTICALS INC - Class A Stock (IRWD). This represents 98% of the company’s total 165,105,778 outstanding shares.
13F concentration
Top 25 institutional shareholders
Largest 13F positions for this security by reported shares and value.
Top holder share
80%
| Institution | Ownership % | Shares Held | Share Change % | Portfolio % | Holdings Value |
|---|---|---|---|---|---|
| ARMISTICE CAPITAL, LLC | 9.1% | 15,028,000 | -6.2% | 1.7% | $52,748,280 |
| BlackRock, Inc. | 8.1% | 13,362,930 | +4.5% | 0% | $46,903,884 |
| Sarissa Capital Management LP | 5.6% | 9,188,635 | -42% | 20% | $32,252,109 |
| BANK OF AMERICA CORP /DE/ | 5.3% | 8,682,907 | -25% | 0% | $30,477,004 |
| RENAISSANCE TECHNOLOGIES LLC | 4.9% | 8,061,073 | -1.8% | 0.04% | $28,294,366 |
| AQR CAPITAL MANAGEMENT LLC | 4.6% | 7,535,080 | +60% | 0.01% | $26,448,131 |
| STATE STREET CORP | 4.5% | 7,456,944 | +69% | 0% | $26,173,873 |
| VANGUARD PORTFOLIO MANAGEMENT LLC | 4% | 6,682,037 | 0% | 0% | $23,453,950 |
| ACADIAN ASSET MANAGEMENT LLC | 4% | 6,577,272 | +1.8% | 0.03% | $23,065,000 |
| VANGUARD CAPITAL MANAGEMENT LLC | 3.7% | 6,097,454 | 0% | 0% | $21,402,064 |
| TWO SIGMA INVESTMENTS, LP | 3.5% | 5,848,276 | +105% | 0.02% | $20,527,449 |
| CHARLES SCHWAB INVESTMENT MANAGEMENT INC | 2.9% | 4,737,857 | -4.8% | 0% | $16,629,878 |
| GEODE CAPITAL MANAGEMENT, LLC | 2.8% | 4,543,522 | +25% | 0% | $15,950,694 |
| MARSHALL WACE, LLP | 2.7% | 4,525,064 | +2.3% | 0.02% | $15,882,975 |
| JACOBS LEVY EQUITY MANAGEMENT, INC | 2.2% | 3,632,477 | +32% | 0.05% | $12,749,994 |
| ARROWSTREET CAPITAL, LIMITED PARTNERSHIP | 2.1% | 3,397,242 | +724% | 0.01% | $11,924,319 |
| FEDERATED HERMES, INC. | 2% | 3,348,806 | +0.92% | 0.02% | $11,754,309 |
| GOLDMAN SACHS GROUP INC | 1.6% | 2,690,634 | +111% | 0% | $9,444,125 |
| DIMENSIONAL FUND ADVISORS LP | 1.3% | 2,082,055 | +529% | 0% | $7,306,566 |
| Connor, Clark & Lunn Investment Management Ltd. | 1.1% | 1,835,424 | -7.8% | 0.01% | $6,442,338 |
| Qube Research & Technologies Ltd | 0.96% | 1,590,081 | -5.4% | 0.01% | $5,581,184 |
| SUSQUEHANNA INTERNATIONAL GROUP, LLP | 0.89% | 1,472,157 | +228% | 0.01% | $5,167,271 |
| NORTHERN TRUST CORP | 0.77% | 1,265,842 | +2.6% | 0% | $4,443,105 |
| Hillsdale Investment Management Inc. | 0.75% | 1,236,628 | +6.9% | 0.12% | $4,340,565 |
| Pacer Advisors, Inc. | 0.69% | 1,134,512 | 0.01% | $3,982,000 |
Quarter history
Institutional holders across reporting periods
Holder count, reported shares/value, and median price by quarter.
Periods
50
Latest
Q1 2026
Rows shown
1-25 of 50
| Period | 13F Shares, Excl. Options | Value, Excl. Options | Value Change | Price (Median) | Investors |
|---|---|---|---|---|---|
| 2026 Q2 | 2,004,281 | $8,428,935 | -$2,295,807 | $4.21 | 43 |
| 2026 Q1 | 161,460,100 | $566,652,208 | +$30,591,294 | $3.51 | 225 |
| 2025 Q4 | 153,978,212 | $519,062,006 | +$36,443,345 | $3.37 | 196 |
| 2025 Q3 | 148,541,007 | $194,617,095 | +$6,212,194 | $1.31 | 160 |
| 2025 Q2 | 146,448,573 | $105,056,220 | -$19,990,203 | $0.72 | 151 |
| 2025 Q1 | 155,587,802 | $228,692,691 | -$26,001,186 | $1.47 | 200 |
| 2024 Q4 | 164,213,918 | $727,463,387 | +$1,737,232 | $4.43 | 222 |
| 2024 Q3 | 163,472,233 | $673,496,034 | -$53,233,700 | $4.12 | 218 |
| 2024 Q2 | 171,468,668 | $1,117,746,593 | -$10,390,681 | $6.52 | 226 |
| 2024 Q1 | 172,118,333 | $1,499,071,284 | +$34,523,403 | $8.71 | 259 |
| 2023 Q4 | 164,989,974 | $1,887,503,875 | +$27,460,717 | $11.44 | 248 |
| 2023 Q3 | 162,344,641 | $1,563,374,016 | -$47,770,085 | $9.63 | 248 |
| 2023 Q2 | 166,095,520 | $1,767,006,761 | +$4,551,974 | $10.64 | 249 |
| 2023 Q1 | 165,499,147 | $1,741,215,310 | -$25,432,141 | $10.52 | 253 |
| 2022 Q4 | 167,942,496 | $2,080,711,382 | -$11,969,237 | $12.39 | 248 |
| 2022 Q3 | 169,832,029 | $1,759,668,119 | -$66,873,989 | $10.36 | 234 |
| 2022 Q2 | 175,222,861 | $2,020,512,624 | +$105,001,683 | $11.53 | 229 |
| 2022 Q1 | 166,602,554 | $2,094,673,928 | -$62,666,606 | $12.58 | 205 |
| 2021 Q4 | 171,908,670 | $2,002,842,425 | -$78,175,850 | $11.66 | 206 |
| 2021 Q3 | 177,433,352 | $2,315,405,743 | +$38,243,173 | $13.06 | 216 |
| 2021 Q2 | 174,523,300 | $2,245,931,885 | +$54,432,994 | $12.87 | 200 |
| 2021 Q1 | 171,145,457 | $1,913,286,723 | -$10,293,889 | $11.18 | 202 |
| 2020 Q4 | 171,628,514 | $1,954,636,964 | -$289,602 | $11.39 | 191 |
| 2020 Q3 | 179,160,124 | $1,611,634,384 | -$60,043,147 | $9.00 | 183 |
| 2020 Q2 | 178,119,023 | $1,838,125,889 | +$1,165,854 | $10.32 | 196 |