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IRWD · Ironwood Pharmaceuticals Inc · Shareholders & Ownership

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$3.63 +0.07 (+1.97%)
Market Cap
$588.25M
Shares
165.24M
Volume · Oct 20 1.64M Avg daily vol (3M) 1.99M

Every disclosed holder of IRWD in one list: 13F institutions, Schedule 13D and 13G filers, insiders (Forms 3, 4 and 5) and registered funds, each from its own latest filing. Holders nest by CIK and SEC reporting links, never by name, and each is summed once.

Who Owns IRWD

13F quarter Sep 30, 2026, combined view: filers that have not filed yet carry their Jun 30, 2026 positions

No chart: the summed disclosures exceed shares outstanding, so they are not parts of one whole.

Holder group Shares % Out
Institutional (13F) 160,847,164 97.34%
Insiders (Forms 3, 4, 5) 7,133,065 4.32%
13D/G-only blocks 0 0.00%
Remaining 2,740,282 -1.66%
Registered funds (N-PORT, not summed) 51,144,843 30.95%

Shares outstanding: 165,239,947, the issuer's latest cover-page count restated onto today's split basis.

Remaining is negative: the summed disclosures exceed shares outstanding, as when filings are dated at different times or holders that do not disclose their links count the same shares. It is flagged, not clipped.

13D/G-only counts each filer's latest 13D or 13G that no 13F report of the listing contains, that names no 13F filer and that no counted insider files. Funds are never summed: their shares sit inside their advisers' 13F reports.

Holders of IRWD

# Holder Shares
1
BlackRock, Inc.
13F CIK 2012383 · Holding company · Jun 30, 2026
carried, not yet filed for the newest quarter
17,788,557
1.1
BlackRock, Inc.
13G CIK 2012383 · Holding company · Jun 30, 2026
Rule 13d-1(b), qualified institution, not summed
13,373,568
1.2
iShares Russell 2000 ETF
Fund S000004344 · Registered fund · Jun 30, 2026
iShares Trust, not summed
4,262,458
1.3
iShares Russell 2000 Growth ETF
Fund S000004343 · Registered fund · Jun 30, 2026
iShares Trust, not summed
1,413,903
1.4
iShares Biotechnology ETF
Fund S000004350 · Registered fund · Jun 30, 2026
iShares Trust, not summed
1,116,521
1.5
BlackRock Advantage Small Cap Core Fund
Fund S000039982 · Registered fund · May 29, 2026
BlackRock Funds, not summed
833,504
2
ARMISTICE CAPITAL, LLC
13F CIK 1601086 · Registered investment adviser · Jun 30, 2026
carried, not yet filed for the newest quarter
13,932,000
2.1
ARMISTICE CAPITAL, LLC
13G CIK 1601086 · Registered investment adviser · Jun 30, 2026
Rule 13d-1(b), qualified institution, not summed
13,932,000
3
Sarissa Capital Management LP
13F CIK 1577524 · Investment adviser · Jun 30, 2026
carried, not yet filed for the newest quarter
9,188,635
4
STATE STREET CORP
13F CIK 93751 · Bank · Jun 30, 2026
carried, not yet filed for the newest quarter
8,809,601
4.1
STATE STREET CORP
13G CIK 93751 · Bank · Jun 30, 2026
Rule 13d-1(b), qualified institution, not summed
8,809,601
4.2
State Street(R) SPDR(R) S&P(R) Biotech ETF
Fund S000010018 · Registered fund · Jun 30, 2026
SPDR SERIES TRUST, not summed
5,499,839
4.3
STATE STREET SMALL/MID CAP EQUITY INDEX PORTFOLIO
Fund S000050332 · Registered fund · Jun 30, 2026
STATE STREET INSTITUTIONAL INVESTMENT TRUST, not summed
60,678
4.4
State Street Total Return V.I.S. Fund
Fund S000001637 · Registered fund · Jun 30, 2026
STATE STREET VARIABLE INSURANCE SERIES FUNDS INC, not summed
4,327
4.5
State Street Balanced Index Fund
Fund S000082802 · Registered fund · Jun 30, 2026
STATE STREET INSTITUTIONAL INVESTMENT TRUST, not summed
922
5
BANK OF AMERICA CORP /DE/
13F CIK 70858 · Bank · Jun 30, 2026
carried, not yet filed for the newest quarter
8,683,803
6
RENAISSANCE TECHNOLOGIES LLC
13F CIK 1037389 · Registered investment adviser · Jun 30, 2026
carried, not yet filed for the newest quarter
7,993,226
7
VANGUARD CAPITAL MANAGEMENT LLC
13F CIK 2100119 · Registered investment adviser · Jun 30, 2026
carried, not yet filed for the newest quarter
6,608,508
8
AQR CAPITAL MANAGEMENT LLC
13F CIK 1167557 · Registered investment adviser · Jun 30, 2026
carried, not yet filed for the newest quarter
6,465,921
8.1
AQR Small Cap Multi-Style Fund
Fund S000040064 · Registered fund · Jun 30, 2026
AQR Funds, not summed
254,364
8.2
AQR Small Cap Momentum Style Fund
Fund S000025644 · Registered fund · Mar 31, 2026
AQR Funds, not summed
14,156
9
ACADIAN ASSET MANAGEMENT LLC
13F CIK 916542 · Unknown · Jun 30, 2026
carried, not yet filed for the newest quarter
5,853,331
10
VANGUARD PORTFOLIO MANAGEMENT LLC
13F CIK 2100121 · Registered investment adviser · Jun 30, 2026
carried, not yet filed for the newest quarter
5,513,355
11
GEODE CAPITAL MANAGEMENT, LLC
13F CIK 1214717 · Registered investment adviser · Jun 30, 2026
carried, not yet filed for the newest quarter
4,831,657
12
VANGUARD TOTAL STOCK MARKET INDEX FUND
Fund S000002848 · Registered fund · Jun 30, 2026
VANGUARD INDEX FUNDS, not summed
4,781,484
13
TWO SIGMA INVESTMENTS, LP
13F CIK 1179392 · Registered investment adviser · Jun 30, 2026
carried, not yet filed for the newest quarter
4,556,089
14
MARSHALL WACE, LLP
13F CIK 1318757 · Exempt reporting adviser · Jun 30, 2026
carried, not yet filed for the newest quarter
4,290,093
15
JACOBS LEVY EQUITY MANAGEMENT, INC
13F CIK 884414 · Registered investment adviser · Jun 30, 2026
carried, not yet filed for the newest quarter
4,065,964
16
GOLDMAN SACHS GROUP INC
13F CIK 886982 · Holding company · Jun 30, 2026
carried, not yet filed for the newest quarter
3,313,808
16.1
Goldman Sachs Small Cap Growth Insights Fund
Fund S000014930 · Registered fund · Jul 31, 2026
Goldman Sachs Trust, not summed
87,852
16.2
Goldman Sachs ActiveBeta(R) U.S. Small Cap Equity ETF
Fund S000048296 · Registered fund · May 31, 2026
Goldman Sachs ETF Trust, not summed
73,969
16.3
Goldman Sachs Small Cap Equity Insights Fund
Fund S000009329 · Registered fund · Jul 31, 2026
Goldman Sachs Trust, not summed
69,155
16.4
Goldman Sachs Absolute Return Tracker Fund
Fund S000020314 · Registered fund · Jun 30, 2026
GOLDMAN SACHS TRUST, not summed
27,789
16.5
Goldman Sachs Variable Insurance Trust Small Cap Equity Insights Fund
Fund S000009355 · Registered fund · Jun 30, 2026
Goldman Sachs Variable Insurance Trust, not summed
16,973
17
CHARLES SCHWAB INVESTMENT MANAGEMENT INC
13F CIK 884546 · Registered investment adviser · Jun 30, 2026
carried, not yet filed for the newest quarter
3,302,242
17.1
Schwab Fundamental U.S. Small Company ETF
Fund S000040878 · Registered fund · May 31, 2026
SCHWAB STRATEGIC TRUST, not summed
2,465,723
17.2
Schwab U.S. Small-Cap ETF
Fund S000026636 · Registered fund · May 31, 2026
SCHWAB STRATEGIC TRUST, not summed
689,826
17.3
Schwab Fundamental U.S. Small Company Index Fund
Fund S000016767 · Registered fund · Jul 31, 2026
SCHWAB CAPITAL TRUST, not summed
420,307
17.4
Schwab Small-Cap Index Fund
Fund S000005912 · Registered fund · Jul 31, 2026
SCHWAB CAPITAL TRUST, not summed
398,128
17.5
Schwab Total Stock Market Index Fund
Fund S000005913 · Registered fund · Jul 31, 2026
SCHWAB CAPITAL TRUST, not summed
95,218
18
FEDERATED HERMES, INC.
13F CIK 1056288 · Investment adviser · Jun 30, 2026
carried, not yet filed for the newest quarter
3,231,238
19
ARROWSTREET CAPITAL, LIMITED PARTNERSHIP
13F CIK 1164508 · Registered investment adviser · Jun 30, 2026
carried, not yet filed for the newest quarter
3,017,089
20
DIMENSIONAL FUND ADVISORS LP
13F CIK 354204 · Registered investment adviser · Jun 30, 2026
carried, not yet filed for the newest quarter
2,522,891
20.1
U.S. SMALL CAP PORTFOLIO
Fund S000000971 · Registered fund · Jul 31, 2026
DFA INVESTMENT DIMENSIONS GROUP INC, not summed
634,531
20.2
U.S. MICRO CAP PORTFOLIO
Fund S000000948 · Registered fund · Jul 31, 2026
DFA INVESTMENT DIMENSIONS GROUP INC, not summed
538,751
20.3
Dimensional U.S. Small Cap ETF
Fund S000070906 · Registered fund · Jul 31, 2026
Dimensional ETF Trust, not summed
534,999
20.4
Dimensional U.S. Core Equity 2 ETF
Fund S000070903 · Registered fund · Jul 31, 2026
Dimensional ETF Trust, not summed
272,518
20.5
U.S. CORE EQUITY 2 PORTFOLIO
Fund S000000980 · Registered fund · Jul 31, 2026
DFA INVESTMENT DIMENSIONS GROUP INC, not summed
88,288
21
MACKENZIE FINANCIAL CORP
13F CIK 919859 · Registered investment adviser · Jun 30, 2026
carried, not yet filed for the newest quarter
2,367,493
22
MCCOURT Thomas A
Insider CIK 1478448 · Mar 10, 2026
Director, issuer-wide
1,898,838
23
MORGAN STANLEY
13F CIK 895421 · Holding company · Jun 30, 2026
carried, not yet filed for the newest quarter
1,859,914
24
VANGUARD STRATEGIC EQUITY FUND
Fund S000002593 · Registered fund · Jun 30, 2026
VANGUARD HORIZON FUNDS, not summed
1,833,231
25
Connor, Clark & Lunn Investment Management Ltd.
13F CIK 1596800 · Registered investment adviser · Jun 30, 2026
carried, not yet filed for the newest quarter
1,811,714
26
VANGUARD EXTENDED MARKET INDEX FUND
Fund S000002841 · Registered fund · Jun 30, 2026
VANGUARD INDEX FUNDS, not summed
1,677,797
27
VANGUARD EXPLORER FUND
Fund S000002578 · Registered fund · Jul 31, 2026
VANGUARD EXPLORER FUND, not summed
1,403,741
28
NORTHERN TRUST CORP
13F CIK 73124 · Bank · Jun 30, 2026
carried, not yet filed for the newest quarter
1,373,974
28.1
Small Cap Index Fund
Fund S000001245 · Registered fund · Jun 30, 2026
Northern Funds, not summed
84,236
28.2
Small Cap Core Fund
Fund S000001244 · Registered fund · Jun 30, 2026
Northern Funds, not summed
27,227
29
Federated Hermes MDT Small Cap Core Fund
Fund S000012972 · Registered fund · Jul 31, 2026
Federated Hermes MDT Series, not summed
1,286,341
30
Hillsdale Investment Management Inc.
13F CIK 1368465 · Registered investment adviser · Jun 30, 2026
carried, not yet filed for the newest quarter
1,250,428
31
WELLS FARGO & COMPANY/MN
13F CIK 72971 · Bank · Jun 30, 2026
carried, not yet filed for the newest quarter
1,206,198
32
DEUTSCHE BANK AG\
13F CIK 948046 · Non-US institution · Jun 30, 2026
carried, not yet filed for the newest quarter
1,158,138
32.1
DWS Small Cap Index VIP
Fund S000006223 · Registered fund · Jun 30, 2026
DEUTSCHE DWS INVESTMENTS VIT FUNDS, not summed
25,705
33
Pacer Advisors, Inc.
13F CIK 1616667 · Unknown · Jun 30, 2026
carried, not yet filed for the newest quarter
1,095,513
34
Pacer US Small Cap Cash Cows 100 ETF
Fund S000055468 · Registered fund · Jul 31, 2026
Pacer Funds Trust, not summed
1,079,411
35
VANGUARD FIDUCIARY TRUST CO
13F CIK 933478 · Unknown · Jun 30, 2026
carried, not yet filed for the newest quarter
1,040,335
36
FRANKLIN RESOURCES INC
13F CIK 38777 · Investment adviser · Jun 30, 2026
carried, not yet filed for the newest quarter
1,006,979
36.1
Franklin Small Cap Enhanced ETF
Fund S000097279 · Registered fund · Jun 30, 2026
Franklin Templeton ETF Trust, not summed
161,157
36.2
Putnam Dynamic Asset Allocation Growth Fund
Fund S000000780 · Registered fund · Jun 30, 2026
Putnam Asset Allocation Funds, not summed
104,715
36.3
Putnam Dynamic Asset Allocation Balanced Fund
Fund S000000778 · Registered fund · Jun 30, 2026
Putnam Asset Allocation Funds, not summed
72,370
36.4
Putnam Dynamic Asset Allocation Conservative Fund
Fund S000000779 · Registered fund · Jun 30, 2026
Putnam Asset Allocation Funds, not summed
11,279
36.5
Franklin U.S. Small Cap Multifactor Index ETF
Fund S000057202 · Registered fund · Jun 30, 2026
Franklin Templeton ETF Trust, not summed
8,589
37
FMR LLC
13F CIK 315066 · Holding company · Jun 30, 2026
carried, not yet filed for the newest quarter
909,488
37.1
Fidelity Small Cap Index Fund
Fund S000033638 · Registered fund · Jul 31, 2026
Fidelity Salem Street Trust, not summed
1,790,034
37.2
Fidelity Extended Market Index Fund
Fund S000006021 · Registered fund · May 31, 2026
Fidelity Concord Street Trust, not summed
740,842
37.3
Fidelity Enhanced Small Cap Core ETF
Fund S000081807 · Registered fund · Jun 30, 2026
Fidelity Covington Trust, not summed
740,102
37.4
Fidelity Small-Mid Multifactor ETF
Fund S000064786 · Registered fund · Jul 31, 2026
Fidelity Covington Trust, not summed
466,785
37.5
Fidelity Total Market Index Fund
Fund S000006026 · Registered fund · May 31, 2026
Fidelity Concord Street Trust, not summed
269,516
38
Bridge Builder Small/Mid Cap Growth Fund
Fund S000048336 · Registered fund · Jun 30, 2026
Bridge Builder Trust, not summed
904,987
39
VANGUARD RUSSELL 2000 INDEX FUND
Fund S000030003 · Registered fund · May 31, 2026
VANGUARD SCOTTSDALE FUNDS, not summed
823,033
40
STATE OF WISCONSIN INVESTMENT BOARD
13F CIK 854157 · Pension or benefit plan · Jun 30, 2026
carried, not yet filed for the newest quarter
778,515
41
Federated Hermes MDT Small Cap Growth Fund
Fund S000012973 · Registered fund · Jul 31, 2026
Federated Hermes MDT Series, not summed
732,361
42
RAYMOND JAMES FINANCIAL INC
13F CIK 720005 · Unknown · Jun 30, 2026
carried, not yet filed for the newest quarter
725,085
43
Currie Mark G
Insider CIK 1478244 · Jun 16, 2026
President and CSO, issuer-wide
676,900
44
VICTORY CAPITAL MANAGEMENT INC
13F CIK 1040188 · Registered investment adviser · Jun 30, 2026
carried, not yet filed for the newest quarter
658,457
44.1
VictoryShares Small Cap Free Cash Flow ETF
Fund S000080690 · Registered fund · Jun 30, 2026
Victory Portfolios II, not summed
487,698
44.2
Victory Small Cap Stock Fund
Fund S000012914 · Registered fund · Jul 31, 2026
Victory Portfolios III, not summed
146,579
44.3
Victory Extended Market Index Fund
Fund S000012941 · Registered fund · Jul 31, 2026
Victory Portfolios III, not summed
18,297
44.4
Victory Cornerstone Aggressive Fund
Fund S000037226 · Registered fund · May 31, 2026
Victory Portfolios III, not summed
6,158
45
Shetzline Michael
Insider CIK 1808509 · Mar 10, 2026
SVP, CMO, Head-Res&Drug, issuer-wide
658,037
46
Inspire Investing, LLC
13F CIK 1670139 · Registered investment adviser · Jun 30, 2026
carried, not yet filed for the newest quarter
630,072
46.1
Inspire Fidelis Multi Factor ETF
Fund S000076870 · Registered fund · May 31, 2026
Northern Lights Fund Trust IV, not summed
566,621
47
HRT FINANCIAL LP
13F CIK 1475597 · Unknown · Jun 30, 2026
carried, not yet filed for the newest quarter
577,337
48
IEQ CAPITAL, LLC
13F CIK 1779789 · Registered investment adviser · Jun 30, 2026
carried, not yet filed for the newest quarter
561,588
49
Vanguard Global Advisers, LLC
13F CIK 1811242 · Registered investment adviser · Jun 30, 2026
carried, not yet filed for the newest quarter
561,038
50
PRUDENTIAL FINANCIAL INC
13F CIK 1137774 · Insurance company · Jun 30, 2026
carried, not yet filed for the newest quarter
537,199

37 more nested rows are not shown here; Every filing lists them all.

Shares are restated onto today's split basis. Change compares each row with the same holder's previous filing in the same source; a dash means there is none to compare. Nested 13D/G, insider and fund rows are not summed, since a 13F report already holds them.

Showing 1–50 of 327 holders

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Key facts CIK 1446847 CUSIP 46333X108 13F (30d) 18 filings 18 filers Visit website Investor relations