Security key
46333X108
IRONWOOD PHARMACEUTICALS INC - COMMON STOCK (IRWD)
CUSIP: 46333X108
Q1 2025 13F Holders as of 31 Mar 2025
- Security type / class
- Equity / COMMON STOCK
- Total 13F shares
- 155,587,802
- Total 13F value
- $228,692,691
- Share change
- -8,943,189
- Put/Call ratio
- 0.06%
- SEC-reported price per share
- $1.47
- Number of holders
- 200
- Value change
- -$26,001,186
- Number of buys
- 101
- Number of sells
- 114
- Shares outstanding
- 163,140,759
Holder snapshot
7 signals
Open additional details 1 more signal available
Security identity
Names, identifiers, and filing context for this profile.
1 source field
Report period
Q1 2025
Institutions
200
Top holders
10
IRWD full security history
Ownership snapshot
Full 13F holder table
IRONWOOD PHARMACEUTICALS INC SEC filings
IRONWOOD PHARMACEUTICALS INC company facts
Broader feeds
Ownership snapshot
Top reported holders of IRWD - IRONWOOD PHARMACEUTICALS INC - COMMON STOCK (13F + 13D/G + 3/4/5)
Grouped by holder across the latest SEC ownership disclosures. Start with comparable ownership when available, then verify the linked 13F, 13D/G, or 3/4/5 evidence.
Comparable stake leader
RENAISSANCE TECHNOLOGIES LLC
Disclosed value leader
Sarissa Capital Managemen...
Comparable rows
15/15
Latest evidence
31 Dec 2024
13F
13D/G
Lead comparable stake: 5.4%
13D/G row: RENAISSANCE TECHNOLOGIES LLC
Showing 1-6 of 15 holder rows.
Quick read
RENAISSANCE TECHNOLOGIES LLC leads the comparable SEC ownership view at 5.4%.
15 of 15 rows have a safely comparable ownership percentage. Use this as a filing-backed starting point, then open the detailed table for source links, reporting role, position value, share count, and filing date.
Open SEC evidence
Opens RENAISSANCE TECHNOLOGIES LLC's linked filing trail.
Comparable ownership
Top 5
RENAISSANCE TECHNOLOGIES LLC
5.4%
Pacer Advisors, Inc.
1.1%
Sarissa Capital Management LP
10%
ARMISTICE CAPITAL, LLC
5.8%
BRAIDWELL LP
3.3%
Ownership % is shown only when SEC disclosures are safely comparable across share classes.
Detailed SEC evidence table Showing 1-6 of 15 holder rows
| Holder | Evidence | Ownership % | Position | 12M Net Δ | As of |
|---|---|---|---|---|---|
| RENAISSANCE TECHNOLOGIES LLC |
13F
13D/G
Company
|
5.4%
from 13D/G
|
$40,163,448
9,066,241 shares
|
— | 31 Dec 2024 |
| Pacer Advisors, Inc. |
13F
13D/G
Company · Pacer US Small Cap Cash Cows ETF
|
1.1%
from 13D/G
|
$51,967,316
11,730,771 shares
|
— | 31 Dec 2024 |
| Sarissa Capital Management LP |
13F
Company
|
10%
|
$72,607,700
16,390,000 shares
|
— | 31 Dec 2024 |
| ARMISTICE CAPITAL, LLC |
13F
Company
|
5.8%
|
$41,943,240
9,468,000 shares
|
— | 31 Dec 2024 |
| BRAIDWELL LP |
13F
Company
|
3.3%
|
$24,100,427
5,440,277 shares
|
— | 31 Dec 2024 |
| Kynam Capital Management, LP |
13F
Company
|
2.9%
|
$20,757,044
4,685,563 shares
|
— | 31 Dec 2024 |
How to read this table
Rows are grouped by holder and ranked first by SEC-reported ownership % when it is safely comparable, then by disclosed holdings value. — indicates unavailable or non-comparable values; "mixed-class rows" means the latest filing spans non-comparable classes.
13F holder rows
Institutional holders as of Q1 2025
Investor-level positions for this CUSIP, loaded as an interactive table.
Institutions
200
Shares
155,587,802
Rows available
200
| Investor | Option | Weight % | Change % | SEC-reported value | * Price | Shares | Share Change | Activity | Report Period |
|---|
* SEC-reported price is the security price as of the portfolio date and can indicate the last known price at which the security was still held. The marker flags a reported price that did not pass the local price check.
Compare Q1 2025 vs Q1 2025 Across Filers
Q1 2025 holders
200
Q1 2025 holders
200
Holder diff
0
| Investor | Q1 2025 Shares | Q1 2025 Shares | Share Diff | Share Chg % | Q1 2025 value | Q1 2025 value | Value change | Value Chg % |
|---|