Latest Period
Q2 2026
Security Snapshot
IRONWOOD PHARMACEUTICALS INC - Class A common stock, $0.001 par value (IRWD) Institutional Ownership
CUSIP: 46333X108
13F Institutional Holders and Ownership History from Q1 2014 to Q2 2026
Institutions Reporting
212
Shares (Excl. Options)
160,555,035
Price
$4.21
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- Security type / class
- Equity / Class A common stock, $0.001 par value
- Symbol
- IRWD on Nasdaq
- All holders as of 30 Jun 2026
- Q2 2026
- Total 13F shares
- 160,555,035
- Total 13F value
- $675,820,984
- Portfolio coverage rank
- 0%
- Share change
- -631,874
- Value change
- -$1,071,811
- Number of holders
- 212
- Shares outstanding
- 165,266,904
- SEC-reported price per share
- $3.87
- Insider filing price
- $3.87
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 common stock, $0.001 par value is tracked under CUSIP 46333X108.
- 212 institutions reported positions in Q2 2026.
- 9 significant owners is listed from Schedule 13D/13G reporting.
Change
- Holder count moved from 226 to 212 between Q1 2026 and Q2 2026.
- SEC-reported value moved from $566,792,745 to $675,820,984.
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 212 institutions filings for Q2 2026.
Security key
46333X108
Latest holder period
Q2 2026
13F holders
212
13D/G owners
9
CIK / CUSIP context first
Open Q2 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 | 8.4% | -14% | $58,653,720 | -$8,811,530 | 13,932,000 | -13% | Armistice Capital, LLC | 30 Jun 2026 |
| 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 | |||
| STATE STREET CORP | 5.4% | +160% | $37,088,420 | +$22,360,624 | 8,809,601 | +152% | STATE STREET CORPORATION | 30 Jun 2026 |
| RENAISSANCE TECHNOLOGIES LLC | 5.4% | $7,565,534 | 8,597,198 | Renaissance Technologies LLC | 15 May 2024 | |||
| 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 30 Jun 2026, 212 institutional investors reported holding 160,555,035 shares of IRONWOOD PHARMACEUTICALS INC - Class A common stock, $0.001 par value (IRWD). This represents 97% of the company’s total 165,266,904 outstanding shares.
13F concentration
Top 25 institutional shareholders
Largest 13F positions for this security by reported shares and value.
Top holder share
81%
| Institution | Ownership % | Shares Held | Share Change % | Portfolio % | Holdings Value |
|---|---|---|---|---|---|
| BlackRock, Inc. | 11% | 17,788,557 | +33% | 0% | $74,889,826 |
| ARMISTICE CAPITAL, LLC | 8.4% | 13,932,000 | -7.3% | 1.6% | $58,653,720 |
| Sarissa Capital Management LP | 5.6% | 9,188,635 | 0% | 22% | $38,684,153 |
| STATE STREET CORP | 5.3% | 8,809,601 | +18% | 0% | $37,088,420 |
| BANK OF AMERICA CORP /DE/ | 5.3% | 8,683,803 | +0.01% | 0% | $36,558,810 |
| RENAISSANCE TECHNOLOGIES LLC | 4.8% | 7,993,226 | -0.84% | 0.05% | $33,651,481 |
| VANGUARD CAPITAL MANAGEMENT LLC | 4% | 6,608,508 | +8.4% | 0% | $27,821,819 |
| AQR CAPITAL MANAGEMENT LLC | 3.9% | 6,465,921 | -14% | 0.01% | $27,221,528 |
| ACADIAN ASSET MANAGEMENT LLC | 3.5% | 5,853,331 | -11% | 0.03% | $24,623,000 |
| VANGUARD PORTFOLIO MANAGEMENT LLC | 3.3% | 5,513,355 | -17% | 0% | $23,211,225 |
| GEODE CAPITAL MANAGEMENT, LLC | 2.9% | 4,831,657 | +6.3% | 0% | $20,345,036 |
| TWO SIGMA INVESTMENTS, LP | 2.8% | 4,556,089 | -22% | 0.01% | $19,181,135 |
| MARSHALL WACE, LLP | 2.6% | 4,290,093 | -5.2% | 0.02% | $18,061,293 |
| JACOBS LEVY EQUITY MANAGEMENT, INC | 2.5% | 4,065,964 | +12% | 0.06% | $17,117,708 |
| GOLDMAN SACHS GROUP INC | 2% | 3,313,808 | +23% | 0% | $13,951,132 |
| CHARLES SCHWAB INVESTMENT MANAGEMENT INC | 2% | 3,302,242 | -30% | 0% | $13,902,439 |
| FEDERATED HERMES, INC. | 2% | 3,231,238 | -3.5% | 0.02% | $13,603,512 |
| ARROWSTREET CAPITAL, LIMITED PARTNERSHIP | 1.8% | 3,017,089 | -11% | 0.01% | $12,701,945 |
| DIMENSIONAL FUND ADVISORS LP | 1.5% | 2,522,891 | +21% | 0% | $10,622,431 |
| MACKENZIE FINANCIAL CORP | 1.4% | 2,367,493 | +323% | 0.01% | $9,967,146 |
| MORGAN STANLEY | 1.1% | 1,859,914 | +125% | 0% | $7,830,240 |
| Connor, Clark & Lunn Investment Management Ltd. | 1.1% | 1,811,714 | -1.3% | 0.01% | $7,627,316 |
| NORTHERN TRUST CORP | 0.83% | 1,373,974 | +8.5% | 0% | $5,784,430 |
| Hillsdale Investment Management Inc. | 0.76% | 1,250,428 | +1.1% | 0.12% | $5,264,302 |
| WELLS FARGO & COMPANY/MN | 0.73% | 1,206,198 | +1950% | 0% | $5,078,094 |
Quarter history
Institutional holders across reporting periods
Holder count, reported shares/value, and median price by quarter.
Periods
50
Latest
Q2 2026
Rows shown
1-25 of 50
| Period | 13F Shares, Excl. Options | Value, Excl. Options | Value Change | Price (Median) | Investors |
|---|---|---|---|---|---|
| 2026 Q2 | 160,555,035 | $675,820,984 | -$1,071,811 | $4.21 | 212 |
| 2026 Q1 | 161,500,139 | $566,792,745 | +$30,731,831 | $3.51 | 226 |
| 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 |