Security key
46333X108
IRONWOOD PHARMACEUTICALS INC - Class A Common Stock (IRWD)
CUSIP: 46333X108
Q4 2025 13F Holders as of 31 Dec 2025
- Security type / class
- Equity / Class A Common Stock
- Total 13F shares
- 153,978,212
- Total 13F value
- $519,062,006
- Share change
- +6,460,869
- Put/Call ratio
- 0.24%
- SEC-reported price per share
- $3.37
- Number of holders
- 196
- Value change
- +$36,443,345
- Number of buys
- 115
- Number of sells
- 63
- Shares outstanding
- 163,103,594
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
Q4 2025
Institutions
196
Top holders
10
IRWD full security history
Ownership snapshot
Full 13F holder table
Newer quarter: Q3 2026
IRONWOOD PHARMACEUTICALS INC SEC filings
IRONWOOD PHARMACEUTICALS INC company facts
Broader feeds
Reporting periods
Holder history for CUSIP 46333X108
Recent filing periods:
Ownership snapshot
Top reported holders of IRWD - IRONWOOD PHARMACEUTICALS INC - Class A 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
4/15
Latest evidence
30 Sep 2025
13F
13D/G
3/4/5
Lead comparable stake: 10%
11 rows are not safely comparable across share classes.
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%.
4 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 4
VANGUARD GROUP INC
10%
RENAISSANCE TECHNOLOGIES LLC
5.4%
BARCLAYS PLC
2%
Pacer Advisors, Inc.
1.1%
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%
Reported 13D/G
· 30 Jun 2025
|
$21,054,327
16,072,006 shares
|
— | 30 Sep 2025 |
| RENAISSANCE TECHNOLOGIES LLC |
13F
13D/G
Company
|
5.4%
Reported 13D/G
· 15 May 2024
|
$10,941,347
8,352,173 shares
|
— | 30 Sep 2025 |
| BARCLAYS PLC |
13D/G
13F
Company
|
2%
Reported 13D/G
· 30 Sep 2025
|
$4,149,704
3,167,713 shares
|
-$10,435,649 | 30 Sep 2025 |
| Pacer Advisors, Inc. |
13D/G
Pacer US Small Cap Cash Cows ETF
|
1.1%
Reported 13D/G
· 31 Mar 2025
|
$1,574,406
1,789,098 shares
|
-$8,748,672 | 31 Mar 2025 |
| ARMISTICE CAPITAL, LLC |
13F
Company
|
—
denominator unverified
|
$21,156,500
16,150,000 shares
|
— | 30 Sep 2025 |
| Sarissa Capital Management LP |
13F
Company
|
—
denominator unverified
|
$20,854,460
15,919,435 shares
|
— | 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 Q4 2025
Investor-level positions for this CUSIP, loaded as an interactive table.
Institutions
196
Shares
153,978,212
Rows available
196
| 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 Q4 2025 vs Q3 2025 Across Filers
Q3 2025 holders
160
Q4 2025 holders
196
Holder diff
36
| Investor | Q3 2025 Shares | Q4 2025 Shares | Share Diff | Share Chg % | Q3 2025 value | Q4 2025 value | Value change | Value Chg % |
|---|
Trend: ostatnie 8 kwartałów (+ wybrane okresy porównania).
Quarterly Holders Trend
Quarterly Value Trend
Quarterly Shares Trend