Security key
46333X108
IRONWOOD PHARMACEUTICALS INC - COMMON STOCK (IRWD)
CUSIP: 46333X108
Q1 2026 13F Holders as of 31 Mar 2026
- Security type / class
- Equity / COMMON STOCK
- Total 13F shares
- 161,500,139
- Total 13F value
- $566,792,745
- Share change
- +8,522,016
- Put/Call ratio
- 3.5%
- SEC-reported price per share
- $3.51
- Number of holders
- 226
- Value change
- +$30,731,831
- Number of buys
- 132
- Number of sells
- 81
- 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 2026
Institutions
226
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
VANGUARD GROUP INC
Disclosed value leader
ARMISTICE CAPITAL, LLC
Comparable rows
15/15
Latest evidence
10 Mar 2026
13F
13D/G
3/4/5
Lead comparable stake: 10%
13D/G row: VANGUARD GROUP INC
Showing 1-6 of 15 holder rows.
Quick read
VANGUARD GROUP INC leads the comparable SEC ownership view at 10%.
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 VANGUARD GROUP INC's linked filing trail.
Comparable ownership
Top 5
VANGUARD GROUP INC
10%
ARMISTICE CAPITAL, LLC
9.2%
BANK OF AMERICA CORP /DE/
6.1%
Sarissa Capital Management LP
5.8%
RENAISSANCE TECHNOLOGIES LLC
4.9%
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 |
|---|---|---|---|---|---|
| VANGUARD GROUP INC |
13F
13D/G
Company · The Vanguard Group
|
10%
from 13D/G
|
$53,779,120
15,958,196 shares
|
— | 31 Dec 2025 |
| ARMISTICE CAPITAL, LLC |
13F
13D/G
Company
|
9.2%
from 13D/G
|
$54,004,250
16,025,000 shares
|
— | 31 Dec 2025 |
| BANK OF AMERICA CORP /DE/ |
13F
13D/G
Company
|
6.1%
from 13D/G
|
$38,827,995
11,521,660 shares
|
— | 31 Dec 2025 |
| Sarissa Capital Management LP |
13F
13D/G
Company · Alexander J. Denner
|
5.8%
from 13D/G
|
$53,648,496
15,919,435 shares
|
— | 31 Dec 2025 |
| RENAISSANCE TECHNOLOGIES LLC |
13F
13D/G
Company
|
4.9%
from 13D/G
|
$27,650,759
8,204,973 shares
|
— | 31 Dec 2025 |
| BARCLAYS PLC |
13D/G
13F
Company
|
2%
|
$4,149,704
3,167,713 shares
|
-$10,435,649 | 30 Sep 2025 |
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 2026
Investor-level positions for this CUSIP, loaded as an interactive table.
Institutions
226
Shares
161,500,139
Rows available
226
| 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 2026 vs Q1 2026 Across Filers
Q1 2026 holders
226
Q1 2026 holders
226
Holder diff
0
| Investor | Q1 2026 Shares | Q1 2026 Shares | Share Diff | Share Chg % | Q1 2026 value | Q1 2026 value | Value change | Value Chg % |
|---|