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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
30 Jun 2026
the date the book describes
Filed
27 Oct 2026
latest of these filings; the earliest 3 Aug 2026
Managers listing it
22
at least, of 95 tracked, among listed positions
Comparable managers
91
filed both Q1 2026 and Q2 2026; 1 listed it in both
Shares listed
35,724,312
combined, among listed positions
Reported value
$150m
combined, at the quarter end

AllianceBernstein LP. Values in this filing are at the previous quarter end's prices; its share count is the quarter end's.

Among the 91 comparable managers: 7 buyers (opened or added shares) and 17 sellers (trimmed or exited), at least, among listed positions. Their net change in shares was -6,158,145.

Managers listing IRWD in Q2 2026

Share of 13F value is the position’s reported value over everything the manager reported that quarter. The share change is against Q1 2026, and only where both filings list the position. A rise in value with no rise in shares is the price, not buying.

22 of 22 holders

ActionFiling
Renaissance Technologies LLC7,993,226$34munder 0.1%Trimmed-67,84713 Aug 2026 (the filing on sec.gov)
AQR Capital Management LLC6,465,921$27munder 0.1%Trimmed-1,069,15914 Aug 2026 (the filing on sec.gov)
Acadian Asset Management LLC5,853,331$25munder 0.1%Trimmed-723,94113 Aug 2026 (the filing on sec.gov)
Two Sigma Investments LP4,556,089$19munder 0.1%Trimmed-1,292,18714 Aug 2026 (the filing on sec.gov)
Marshall Wace LLP4,290,093$18munder 0.1%Trimmed-234,97113 Aug 2026 (the filing on sec.gov)
Arrowstreet Capital LP3,017,089$13munder 0.1%Trimmed-380,15313 Aug 2026 (the filing on sec.gov)
Fidelity (FMR LLC)909,488$3.8munder 0.1%Added+119,10213 Aug 2026 (the filing on sec.gov)
Citadel Advisors LLC502,403$2.1munder 0.1%Added+384,1272 Sep 2026 (the filing on sec.gov)
Wellington Management Group LLP468,821$2.0munder 0.1%Added+15,30614 Aug 2026 (the filing on sec.gov)
Invesco Ltd403,209$1.7munder 0.1%Trimmed-144,15114 Aug 2026 (the filing on sec.gov)
Man Group PLC392,117$1.7munder 0.1%Trimmed-148,74714 Aug 2026 (the filing on sec.gov)
AllianceBernstein LP165,790$582kunder 0.1%Held014 Aug 2026 (the filing on sec.gov)
Jane Street Group LLC129,700$546kunder 0.1%Trimmed-492,54714 Aug 2026 (the filing on sec.gov)
Susquehanna International Group LLP129,237$544kunder 0.1%Trimmed-1,342,92014 Aug 2026 (the filing on sec.gov)
T. Rowe Price Associates Inc128,772$543kunder 0.1%Added+4,45814 Aug 2026 (the filing on sec.gov)
D. E. Shaw & Co.122,907$517kunder 0.1%Added+74,96914 Aug 2026 (the filing on sec.gov)
Winton Group Ltd84,156$354kunder 0.1%Trimmed-157,5907 Aug 2026 (the filing on sec.gov)
Squarepoint Ops LLC66,899$282kunder 0.1%Added+34,15314 Aug 2026 (the filing on sec.gov)
Schonfeld Strategic Advisors LLC28,428$120kunder 0.1%Trimmed-29,94914 Aug 2026 (the filing on sec.gov)
Neuberger Berman Group LLC12,448$52kunder 0.1%Trimmed-6227 Oct 2026 (the filing on sec.gov)
Quantbot Technologies LP4,187$18kunder 0.1%Added+3,43112 Aug 2026 (the filing on sec.gov)
Walleye Capital LLC1$00.00%Trimmed-225,1353 Aug 2026 (the filing on sec.gov)

Largest increases and reductions, by shares

Q1 2026 to Q2 2026, 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 (0)

No new position among listed positions.

Exited (3)

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 →