Ironwood Pharmaceuticals Inc: which funds bought and sold

Institutions that bought and sold Ironwood Pharmaceuticals shares in Q2 2026, from the holdings they reported to the SEC on Form 13F for March 31, 2026 and June 30, 2026.

Between March 31, 2026 and June 30, 2026, 96 institutions that filed 13F reports for both quarters added to or opened positions in Ironwood Pharmaceuticals, and 119 cut or closed them. Together they sold a net 504K shares, −0.3% on what they held at the start of the quarter. Active managers and hedge funds on our list were net sellers of 6.2M shares (−9.2%); index fund managers were net buyers of 4.1M shares (+8.9%). 24 opened a new position and 35 sold out entirely.

Bought, Q2 2026 96 institutions, 24 of them new holders Sold, Q2 2026 119 institutions, 35 of them sold out

Net change, all compared −504K shares (−0.3%)

Net change, active managers −6.2M shares (−9.2%), 13 bought, 25 sold

Buyers versus sellers

institutions compared, 246

96 bought 31 119 sold

Active managers and hedge funds 13 bought · 25 sold · −6.2M

Index fund managers 7 bought · 5 sold · +4.1M

Other institutions 76 bought · 89 sold · +1.6M

Biggest buyers

by change in shares held

Biggest buyers
Institution	Change in shares	Shares June 30, 2026	Value
Blackrock, Inc. Index funds	+4.4M +33.1%	17.8M	$74.9M
Mackenzie Financial Corp	+1.8M +322.7%	2.4M	$10M
State Street Corp Index funds	+1.4M +18.1%	8.8M	$37.1M
Wells Fargo & Company	+1.1M +1949.6%	1.2M	$5.1M
Morgan Stanley	+1.0M +125.5%	1.9M	$7.8M
Goldman Sachs Group Inc	+623K +23.2%	3.3M	$14M
HRT Financial LP	+577K New position	577K	$2.4M
Vanguard Capital Management LLC Index funds	+511K +8.4%	6.6M	$27.8M
Dimensional Fund Advisors LP	+441K +21.2%	2.5M	$10.6M
Jacobs Levy Equity Management, Inc Active manager	+433K +11.9%	4.1M	$17.1M
Citadel Advisors LLC Hedge fund	+384K +324.8%	502K	$2.1M
Voya Investment Management LLC	+339K +232.2%	484K	$2M
O'Shaughnessy Asset Management, LLC Active manager	+311K +242.2%	439K	$1.8M
Cwa Asset Management Group, LLC	+290K New position	290K	$1.2M
Geode Capital Management, LLC Index funds	+288K +6.3%	4.8M	$20.3M
Ritholtz Wealth Management	+273K +311.4%	360K	$1.5M
Franklin Resources Inc Active manager	+262K +35.2%	1.0M	$4.2M
Virtus Investment Advisers, LLC	+242K +318.3%	319K	$1.3M
Citigroup Inc	+187K +475.6%	227K	$954,929
State Of Wisconsin Investment Board	+180K +30.2%	779K	$3.3M

Biggest buyers, active managers and hedge funds
Institution	Change in shares	Shares June 30, 2026	Value
Jacobs Levy Equity Management, Inc Active manager	+433K +11.9%	4.1M	$17.1M
Citadel Advisors LLC Hedge fund	+384K +324.8%	502K	$2.1M
O'Shaughnessy Asset Management, LLC Active manager	+311K +242.2%	439K	$1.8M
Franklin Resources Inc Active manager	+262K +35.2%	1.0M	$4.2M
Segall Bryant & Hamill, LLC Active manager	+130K +46.7%	408K	$1.7M
FMR LLC Active manager	+119K +15.1%	909K	$3.8M
D. E. Shaw & Co., Inc. Hedge fund	+75K +156.4%	123K	$517,438
Squarepoint Ops LLC Hedge fund	+34K +104.3%	67K	$281,645
Royce & Associates LP Active manager	+19K New position	19K	$78,108
Engineers Gate Manager LP Hedge fund	+18K +22.8%	98K	$412,799

Biggest sellers

by change in shares held

Biggest sellers
Institution	Change in shares	Shares June 30, 2026	Value
Charles Schwab Investment Management Inc Index funds	−1.4M −30.3%	3.3M	$13.9M
Susquehanna International Group, LLP	−1.3M −91.2%	129K	$544,088
Two Sigma Investments, LP Hedge fund	−1.3M −22.1%	4.6M	$19.2M
Qube Research & Technologies Ltd Hedge fund	−1.2M −78.1%	348K	$1.5M
Vanguard Portfolio Management LLC Index funds	−1.2M −17.5%	5.5M	$23.2M
Armistice Capital, LLC Hedge fund	−1.1M −7.3%	13.9M	$58.7M
AQR Capital Management LLC Hedge fund	−1.1M −14.2%	6.5M	$27.2M
Acadian Asset Management LLC Active manager	−724K −11.0%	5.9M	$24.6M
UBS Group AG	−544K −58.3%	390K	$1.6M
Jane Street Group, LLC	−493K −79.2%	130K	$546,038
Integrated Quantitative Investments LLC	−458K −83.0%	94K	$394,431
Millennium Management LLC Hedge fund	−457K Sold out	0	—
Range Financial Group LLC	−420K −97.0%	13K	$54,174
Gsa Capital Partners LLP	−395K −60.3%	260K	$1.1M
Arrowstreet Capital, Limited Partnership Hedge fund	−380K −11.2%	3.0M	$12.7M
Amundi	−371K −91.8%	33K	$138,892
Tidal Investments LLC	−304K Sold out	0	—
Sei Investments Co	−283K −38.1%	459K	$1.9M
Lazard Asset Management LLC Active manager	−263K −90.5%	28K	$116,381
Harvest Investment Services, LLC	−242K Sold out	0	—

Biggest sellers, active managers and hedge funds
Institution	Change in shares	Shares June 30, 2026	Value
Two Sigma Investments, LP Hedge fund	−1.3M −22.1%	4.6M	$19.2M
Qube Research & Technologies Ltd Hedge fund	−1.2M −78.1%	348K	$1.5M
Armistice Capital, LLC Hedge fund	−1.1M −7.3%	13.9M	$58.7M
AQR Capital Management LLC Hedge fund	−1.1M −14.2%	6.5M	$27.2M
Acadian Asset Management LLC Active manager	−724K −11.0%	5.9M	$24.6M
Millennium Management LLC Hedge fund	−457K Sold out	0	—
Arrowstreet Capital, Limited Partnership Hedge fund	−380K −11.2%	3.0M	$12.7M
Lazard Asset Management LLC Active manager	−263K −90.5%	28K	$116,381
Marshall Wace, LLP Hedge fund	−235K −5.2%	4.3M	$18.1M
Walleye Capital LLC Hedge fund	−225K −100.0%	1	$4

New positions

largest by value

Institution	Shares	Value June 30, 2026
HRT Financial LP	577K	$2.4M
Cwa Asset Management Group, LLC	290K	$1.2M
Jump Financial, LLC	40K	$168,248
Envestnet Asset Management Inc	36K	$149,586
Truist Financial Corp	36K	$149,577
Xtx Topco Ltd	28K	$116,390
LPL Financial LLC	26K	$108,727
Royce & Associates LPActive manager	19K	$78,108
Prelude Capital Management, LLC	18K	$77,464
Magnus Financial Group LLC	18K	$75,801

Sold out

largest by value

Institution	Shares	Value March 31, 2026
Millennium Management LLCHedge fund	457K	$1.6M
Tidal Investments LLC	304K	$1.1M
Harvest Investment Services, LLC	242K	$849,002
Hennion & Walsh Asset Management, Inc.	184K	$647,542
Strs Ohio	97K	$341,874
Entrypoint Capital, LLC	87K	$304,928
CIBC World Market Inc.	71K	$250,368
Bank Of Montreal	63K	$220,253
Wedbush Securities Inc	61K	$213,000
Virtus Advisers, LLC	58K	$203,580

Who holds the shares

13F holdings at June 30, 2026

Institutions reporting: 212
Ten largest holders: 56.6%
Index fund managers: 31.0%
Active managers and hedge funds: 38.0%

Buying and selling by type of institution, March 31, 2026 to June 30, 2026
Type	Bought	Sold	New	Sold out	Net change in shares	Net %
Active managers and hedge funds	13	25	1	5	−6.2M	−9.2%
Index fund managers	7	5	0	0	+4.1M	+8.9%
Other institutions	76	89	23	30	+1.6M	+3.3%

Active managers and hedge funds: a list we maintain of about 400 well-known stock-picking firms and hedge funds, matched by SEC registration number (CIK) and checked against the filer names each quarter. Index fund managers: the large index houses, such as BlackRock, Vanguard, State Street, Geode and Northern Trust. Every other filer (banks, brokers, wealth managers, pension funds, insurers and firms not on the list) counts as another institution. A firm that files under several SEC registrations appears once for each.

What these filings can and cannot tell you

Form 13F lists the long positions in US-listed shares held by investment managers with more than $100 million in such holdings. Managers file it up to 45 days after each quarter ends, so this page shows what funds held at the end of each quarter, not what they are doing now: a position may have changed since. Short positions, most derivatives and smaller managers are not included, and a cut can mean a fund lost clients or rebalanced rather than a view on Ironwood Pharmaceuticals.

Only managers that filed a holdings report for both quarters are compared (246 here). 4 other holders are left out: first-time or late filers, firms that changed their SEC registration, and filings that withheld positions under confidential treatment, any of which would otherwise look like a new position or a sale. Figures are as reported by each manager in the SEC's quarterly 13F data sets; option positions are excluded.

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