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IRWD in the 13F filings

Ironwood Pharmaceuticals Inc · CUSIP 46333X108

Sector · Pharmaceuticals and biotechnologyTheme · Healthcare: biopharma and medtech· L3VLUP-definedTheme · Pharmaceutical preparations
Quarter
Q3 2026 · early filersQ2 2026Q1 2026Q4 2025Q3 2025Q2 2025Q1 2025Q4 2024Q3 2024Q2 2024Q1 2024Q4 2023
Quarter end
31 Dec 2025
the date the book describes
Filed
27 Oct 2026
latest of these filings; the earliest 10 Feb 2026
Managers listing it
24
at least, of 95 tracked, among listed positions
Comparable managers
92
filed both Q3 2025 and Q4 2025; 1 listed it in both
Shares listed
37,246,777
combined, among listed positions
Reported value
$126m
combined, at the quarter end

Among the 92 comparable managers: 16 buyers (opened or added shares) and 7 sellers (trimmed or exited), at least, among listed positions. Their net change in shares was +3,004,890.

Managers listing IRWD in Q4 2025

Share of 13F value is the position’s reported value over everything the manager reported that quarter. The share change is against Q3 2025, and only where both filings list the position. A rise in value with no rise in shares is the price, not buying.

24 of 24 holders

ActionFiling
Renaissance Technologies LLC8,204,973$28munder 0.1%Trimmed-147,20012 Feb 2026 (the filing on sec.gov)
Acadian Asset Management LLC6,457,817$22munder 0.1%Trimmed-44,67610 Feb 2026 (the filing on sec.gov)
AQR Capital Management LLC4,723,531$16munder 0.1%Trimmed-655,00417 Feb 2026 (the filing on sec.gov)
Marshall Wace LLP4,424,002$15munder 0.1%Added+1,279,86313 Feb 2026 (the filing on sec.gov)
Two Sigma Advisers LP3,140,100$11munder 0.1%Trimmed-176,40017 Feb 2026 (the filing on sec.gov)
Two Sigma Investments LP2,853,205$9.6munder 0.1%Added+318,69417 Feb 2026 (the filing on sec.gov)
Jane Street Group LLC2,819,562$9.5munder 0.1%Added+498,46712 Feb 2026 (the filing on sec.gov)
Fidelity (FMR LLC)686,737$2.3munder 0.1%Added+126,79117 Feb 2026 (the filing on sec.gov)
Millennium Management LLC560,713$1.9munder 0.1%Added+310,59417 Feb 2026 (the filing on sec.gov)
Walleye Capital LLC527,936$1.8munder 0.1%Newnew13 Feb 2026 (the filing on sec.gov)
Wellington Management Group LLP503,942$1.7munder 0.1%Newnew17 Feb 2026 (the filing on sec.gov)
Invesco Ltd449,219$1.5munder 0.1%Added+82,68719 Feb 2026 (the filing on sec.gov)
Susquehanna International Group LLP448,799$1.5munder 0.1%Added+351,93317 Feb 2026 (the filing on sec.gov)
Arrowstreet Capital LP412,061$1.4munder 0.1%Newnew13 Feb 2026 (the filing on sec.gov)
Citadel Advisors LLC223,969$755kunder 0.1%Trimmed-420,07717 Feb 2026 (the filing on sec.gov)
AllianceBernstein LP199,520$672kunder 0.1%Held017 Feb 2026 (the filing on sec.gov)
Winton Group Ltd164,335$554kunder 0.1%Newnew11 Feb 2026 (the filing on sec.gov)
D. E. Shaw & Co.117,446$396kunder 0.1%Trimmed-254,82417 Feb 2026 (the filing on sec.gov)
T. Rowe Price Associates Inc99,363$335kunder 0.1%Added+19,18517 Feb 2026 (the filing on sec.gov)
Squarepoint Ops LLC88,880$300kunder 0.1%Added+68,61313 Feb 2026 (the filing on sec.gov)
Balyasny Asset Management LLC65,156$220kunder 0.1%Newnew17 Feb 2026 (the filing on sec.gov)
Man Group PLC47,659$161kunder 0.1%Newnew17 Feb 2026 (the filing on sec.gov)
Neuberger Berman Group LLC14,852$50kunder 0.1%Added+4,61027 Oct 2026 (the filing on sec.gov)
Farallon Capital Management LLC13,000$44kunder 0.1%Held017 Feb 2026 (the filing on sec.gov)

Largest increases and reductions, by shares

Q3 2025 to Q4 2025, among managers that listed it in both quarters or opened it.

Increases

Reductions

New positions and exits

At least these many: a manager is shown exiting only where its own filing shows the position gone.

New (6)

Exited (1)

Ownership over time

Every quarter on file. A quarter-end value moves with the price as well as with the shares held; buyers and sellers count comparable managers, by shares.
2 in Q3 2024 to 2 in Q2 2026

Tracked managers listing it, at least.

024682014201620182020202220242026
the quarter shown share split complete books; unmarked quarters rest on listed positionsClick a quarter to open it.
IRWD by quarter
QuarterHoldersReported valueBuyersSellers
Q2 20132$160mn.a.n.a.
Q3 20133$201mn.a.n.a.
Q4 20132$181mn.a.n.a.
Q1 20143$291mn.a.n.a.
Q2 20145$636mn.a.n.a.
Q3 20143$257mn.a.n.a.
Q4 20146$657mn.a.n.a.
Q1 20155$670mn.a.n.a.
Q2 20154$252mn.a.n.a.
Q3 20153$217mn.a.n.a.
Q4 20153$224mn.a.n.a.
Q1 20162$208mn.a.n.a.
Q2 20162$250mn.a.n.a.
Q3 20163$613mn.a.n.a.
Q4 20167$816mn.a.n.a.
Q1 20176$981mn.a.n.a.
Q2 20177$1.2bnn.a.n.a.
Q3 20174$711mn.a.n.a.
Q4 20175$696mn.a.n.a.
Q1 20186$642mn.a.n.a.
Q2 20186$1.1bnn.a.n.a.
Q3 20185$857mn.a.n.a.
Q4 20183$293mn.a.n.a.
Q1 20194$412mn.a.n.a.
Q2 20194$344mn.a.n.a.
Q3 20194$216mn.a.n.a.
Q4 20198$483mn.a.n.a.
Q1 20208$341mn.a.n.a.
Q2 20208$287mn.a.n.a.
Q3 20207$251mn.a.n.a.
Q4 20207$302mn.a.n.a.
Q1 20213$272mn.a.n.a.
Q2 20216$331mn.a.n.a.
Q3 20213$236mn.a.n.a.
Q4 20214$251mn.a.n.a.
Q1 20223$240mn.a.n.a.
Q2 20223$236mn.a.n.a.
Q3 20224$204mn.a.n.a.
Q4 20228$287mn.a.n.a.
Q1 20236$108mn.a.n.a.
Q2 20238$161mn.a.n.a.
Q3 20235$108mn.a.n.a.
Q4 20237$147m52
Q1 20245$108m50
Q2 20244$83m21
Q3 20242$35m11
Q4 20243$41m20
Q1 20251$19k00
Q2 20251$9k00
Q3 20251$17k00
Q4 20253$49m167
Q1 20262$23m1411
Q2 20262$58m717

Compare with…

Holders over time, buyers and sellers, and the managers holding both, side by side for up to four stocks.

IRWD and LLY →IRWD and JNJ →IRWD and VRTX →Choose a stock to compare with IRWD →

How much of the picture this is

A 13F is a manager’s long US-listed equity book at a quarter end, filed up to 45 days later. It shows no shorts, cash, bonds or performance, and it is never today’s portfolio. Large books are listed to their largest positions, so a manager missing from this table may still hold a small position below that line. These are 95 tracked managers, not the institutional market.

Which funds own IRWD, latest filings →Back to the 13F Explorer →