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ICLR in the 13F filings

Icon Pub LTD Co · CUSIP G4705A100

Sector · Health care services and researchTheme · Healthcare: biopharma and medtech· L3VLUP-defined
Quarter
Q3 2026 · early filersQ2 2026Q1 2026Q4 2025Q3 2025Q2 2025Q1 2025Q4 2024Q3 2024Q2 2024Q1 2024Q4 2023
Quarter end
31 Mar 2026
the date the book describes
Filed
27 Oct 2026
latest of these filings; the earliest 12 May 2026
Managers listing it
30
at least, of 95 tracked, among listed positions
Comparable managers
91
filed both Q4 2025 and Q1 2026; 15 listed it in both
Shares listed
38,722,406
combined, among listed positions
Reported value
$4.4bn
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: 23 buyers (opened or added shares) and 13 sellers (trimmed or exited), at least, among listed positions. Their net change in shares was +9,281,815.

Managers listing ICLR in Q1 2026

Share of 13F value is the position’s reported value over everything the manager reported that quarter. The share change is against Q4 2025, and only where both filings list the position. A rise in value with no rise in shares is the price, not buying.

30 of 30 holders

ActionFiling
Artisan Partners LP8,278,945$916m1.47%Added+1,404,96813 May 2026 (the filing on sec.gov)
Wellington Management Group LLP5,913,037$654m0.12%Added+1,562,28715 May 2026 (the filing on sec.gov)
Harris Associates LP4,351,317$482m0.64%Added+1,841,15115 May 2026 (the filing on sec.gov)
Fidelity (FMR LLC)4,174,006$462munder 0.1%Added+1,076,11115 May 2026 (the filing on sec.gov)
Invesco Ltd3,878,869$429munder 0.1%Added+121,97312 May 2026 (the filing on sec.gov)
MFS Investment Management2,727,824$305m0.10%Added+370,79114 May 2026 (the filing on sec.gov)
AllianceBernstein LP1,344,595$245m0.08%Added+72,13315 May 2026 (the filing on sec.gov)
Sachem Head Capital Management LP2,105,000$233m5.61%Newnew15 May 2026 (the filing on sec.gov)
Ruane Cunniff & Goldfarb LP1,634,611$181m3.00%Trimmed-44,97915 May 2026 (the filing on sec.gov)
D. E. Shaw & Co.1,198,555$133m0.08%Added+545,23615 May 2026 (the filing on sec.gov)
Capital World Investors1,104,831$122munder 0.1%Trimmed-391,64813 May 2026 (the filing on sec.gov)
Holocene Advisors LP840,845$93m0.22%Added+678,86215 May 2026 (the filing on sec.gov)
Citadel Advisors LLC251,607$28munder 0.1%Added+209,64215 May 2026 (the filing on sec.gov)
Walleye Capital LLC196,571$22m0.09%Added+62,29013 May 2026 (the filing on sec.gov)
Moore Capital Management LP147,208$16m0.33%Added+90,01815 May 2026 (the filing on sec.gov)
Balyasny Asset Management LLC136,416$15munder 0.1%Added+60,88815 May 2026 (the filing on sec.gov)
Janus Henderson Group Ltd82,061$9.1munder 0.1%Trimmed-166,21818 May 2026 (the filing on sec.gov)
Tudor Investment Corp65,375$7.2munder 0.1%Newnew15 May 2026 (the filing on sec.gov)
Millennium Management LLC50,765$5.6munder 0.1%Newnew15 May 2026 (the filing on sec.gov)
Schonfeld Strategic Advisors LLC49,636$5.5munder 0.1%Newnew15 May 2026 (the filing on sec.gov)
Verition Fund Management LLC42,343$4.7munder 0.1%Added+30,34215 May 2026 (the filing on sec.gov)
Hudson Bay Capital Management LP36,000$4.0munder 0.1%Trimmed-78,00013 May 2026 (the filing on sec.gov)
Winton Group Ltd30,554$3.4m0.12%Newnew12 May 2026 (the filing on sec.gov)
Two Sigma Investments LP28,934$3.2munder 0.1%Added+3415 May 2026 (the filing on sec.gov)
Marshall Wace LLP14,367$1.6munder 0.1%Newnew15 May 2026 (the filing on sec.gov)
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Largest increases and reductions, by shares

Q4 2025 to Q1 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 (8)

Exited (6)

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.
20 in Q3 2024 to 15 in Q2 2026

Tracked managers listing it, at least.

01020302014201620182020202220242026
the quarter shown share split complete books; unmarked quarters rest on listed positionsClick a quarter to open it.
ICLR by quarter
QuarterHoldersReported valueBuyersSellers
Q2 20136$394mn.a.n.a.
Q3 20137$436mn.a.n.a.
Q4 201310$454mn.a.n.a.
Q1 201412$528mn.a.n.a.
Q2 20148$465mn.a.n.a.
Q3 201410$687mn.a.n.a.
Q4 20149$502mn.a.n.a.
Q1 20159$809mn.a.n.a.
Q2 20158$825mn.a.n.a.
Q3 201510$827mn.a.n.a.
Q4 20156$847mn.a.n.a.
Q1 20165$773mn.a.n.a.
Q2 20168$905mn.a.n.a.
Q3 20169$1.1bnn.a.n.a.
Q4 20167$885mn.a.n.a.
Q1 201711$1.1bnn.a.n.a.
Q2 201712$1.3bnn.a.n.a.
Q3 201712$1.5bnn.a.n.a.
Q4 201712$1.5bnn.a.n.a.
Q1 201811$1.6bnn.a.n.a.
Q2 201811$1.9bnn.a.n.a.
Q3 201811$2.2bnn.a.n.a.
Q4 201812$1.8bnn.a.n.a.
Q1 201916$2.1bnn.a.n.a.
Q2 201917$2.4bnn.a.n.a.
Q3 201912$2.2bnn.a.n.a.
Q4 201914$2.7bnn.a.n.a.
Q1 202013$2.0bnn.a.n.a.
Q2 202011$2.6bnn.a.n.a.
Q3 202012$3.0bnn.a.n.a.
Q4 202011$3.1bnn.a.n.a.
Q1 202114$3.0bnn.a.n.a.
Q2 202121$4.2bnn.a.n.a.
Q3 202118$6.7bnn.a.n.a.
Q4 202117$8.3bnn.a.n.a.
Q1 202217$5.6bnn.a.n.a.
Q2 202215$5.0bnn.a.n.a.
Q3 202212$4.3bnn.a.n.a.
Q4 202216$4.5bnn.a.n.a.
Q1 202316$5.3bnn.a.n.a.
Q2 202317$5.9bnn.a.n.a.
Q3 202316$6.0bnn.a.n.a.
Q4 202318$6.6bn911
Q1 202421$8.0bn1110
Q2 202424$7.7bn1312
Q3 202420$6.6bn1011
Q4 202422$4.4bn157
Q1 202519$4.3bn1210
Q2 202526$4.9bn168
Q3 202521$4.9bn817
Q4 202518$5.3bn1220
Q1 202616$3.8bn2313
Q2 202615$6.5bn1916

Compare with…

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

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

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 ICLR, latest filings →Back to the 13F Explorer →