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ALNY in the 13F filings

Alnylam Pharmaceuticals Inc · CUSIP 02043Q107

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 Mar 2026
the date the book describes
Filed
27 Oct 2026
latest of these filings; the earliest 8 May 2026
Managers listing it
32
at least, of 95 tracked, among listed positions
Comparable managers
91
filed both Q4 2025 and Q1 2026; 22 listed it in both
Shares listed
54,535,745
combined, among listed positions
Reported value
$18.0bn
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: 16 buyers (opened or added shares) and 18 sellers (trimmed or exited), at least, among listed positions. Their net change in shares was -3,457,050.

Managers listing ALNY 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.

32 of 32 holders

ActionFiling
Fidelity (FMR LLC)14,579,166$4.8bn0.25%Trimmed-1,322,98315 May 2026 (the filing on sec.gov)
Capital World Investors10,802,348$3.6bn0.49%Trimmed-5,499,42413 May 2026 (the filing on sec.gov)
Capital Research Global Investors9,471,181$3.1bn0.49%Added+2,691,47313 May 2026 (the filing on sec.gov)
Invesco Ltd4,075,120$1.3bn0.13%Trimmed-1,058,86312 May 2026 (the filing on sec.gov)
Baillie Gifford & Co2,493,866$825m0.84%Trimmed-107,1138 May 2026 (the filing on sec.gov)
Two Sigma Investments LP1,992,577$659m0.53%Added+1,376,45715 May 2026 (the filing on sec.gov)
Wellington Management Group LLP1,935,925$641m0.12%Added+306,99415 May 2026 (the filing on sec.gov)
Dodge & Cox1,929,253$638m0.35%Trimmed-35,16214 May 2026 (the filing on sec.gov)
T. Rowe Price Associates Inc1,432,748$474m0.05%Trimmed-270,08315 May 2026 (the filing on sec.gov)
Marshall Wace LLP1,099,318$364m0.36%Added+549,39615 May 2026 (the filing on sec.gov)
D. E. Shaw & Co.1,059,062$350m0.21%Added+614,56915 May 2026 (the filing on sec.gov)
AQR Capital Management LLC913,104$298m0.14%Trimmed-6,85515 May 2026 (the filing on sec.gov)
MFS Investment Management496,004$164m0.06%Added+69714 May 2026 (the filing on sec.gov)
Millennium Management LLC447,887$148m0.06%Added+372,45715 May 2026 (the filing on sec.gov)
Squarepoint Ops LLC426,723$141m0.17%Added+75,75415 May 2026 (the filing on sec.gov)
Woodline Partners LP243,883$81m0.31%Added+242,12415 May 2026 (the filing on sec.gov)
Man Group PLC232,369$77m0.14%Added+88,15915 May 2026 (the filing on sec.gov)
Voloridge Investment Management LLC189,217$63m0.25%Added+28,64015 May 2026 (the filing on sec.gov)
Susquehanna International Group LLP174,268$58munder 0.1%Trimmed-17,55215 May 2026 (the filing on sec.gov)
Janus Henderson Group Ltd147,089$49munder 0.1%Added+10,66418 May 2026 (the filing on sec.gov)
Bridgewater Associates LP106,592$35m0.16%Added+20,97515 May 2026 (the filing on sec.gov)
Neuberger Berman Group LLC93,496$31munder 0.1%Trimmed-21,70727 Oct 2026 (the filing on sec.gov)
Schonfeld Strategic Advisors LLC71,767$24m0.17%Added+26,87315 May 2026 (the filing on sec.gov)
AllianceBernstein LP44,641$18munder 0.1%Added+32215 May 2026 (the filing on sec.gov)
Hudson Bay Capital Management LP40,000$13munder 0.1%Trimmed-45,00013 May 2026 (the filing on sec.gov)
Page 1 of 2

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 (0)

No new position among listed positions.

Exited (2)

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.
18 in Q3 2024 to 21 in Q2 2026

Tracked managers listing it, at least.

0102030402014201620182020202220242026
the quarter shown share split complete books; unmarked quarters rest on listed positionsClick a quarter to open it.
ALNY by quarter
QuarterHoldersReported valueBuyersSellers
Q2 20134$407mn.a.n.a.
Q3 20136$1.2bnn.a.n.a.
Q4 20137$1.5bnn.a.n.a.
Q1 20148$1.6bnn.a.n.a.
Q2 20146$1.7bnn.a.n.a.
Q3 20147$2.1bnn.a.n.a.
Q4 20146$2.2bnn.a.n.a.
Q1 20158$2.9bnn.a.n.a.
Q2 20156$3.3bnn.a.n.a.
Q3 20155$2.1bnn.a.n.a.
Q4 20156$2.7bnn.a.n.a.
Q1 20168$2.0bnn.a.n.a.
Q2 20167$2.0bnn.a.n.a.
Q3 20168$2.6bnn.a.n.a.
Q4 20168$1.6bnn.a.n.a.
Q1 20179$2.2bnn.a.n.a.
Q2 201714$3.8bnn.a.n.a.
Q3 201715$5.7bnn.a.n.a.
Q4 201714$6.3bnn.a.n.a.
Q1 201815$5.7bnn.a.n.a.
Q2 201815$4.4bnn.a.n.a.
Q3 201814$3.9bnn.a.n.a.
Q4 201810$3.3bnn.a.n.a.
Q1 201911$4.6bnn.a.n.a.
Q2 201916$3.8bnn.a.n.a.
Q3 201911$4.4bnn.a.n.a.
Q4 201913$6.2bnn.a.n.a.
Q1 202012$5.7bnn.a.n.a.
Q2 202015$7.7bnn.a.n.a.
Q3 202013$7.6bnn.a.n.a.
Q4 202013$6.5bnn.a.n.a.
Q1 202114$7.2bnn.a.n.a.
Q2 202113$8.8bnn.a.n.a.
Q3 202114$9.7bnn.a.n.a.
Q4 202112$8.8bnn.a.n.a.
Q1 202212$8.9bnn.a.n.a.
Q2 202213$8.1bnn.a.n.a.
Q3 202217$10.8bnn.a.n.a.
Q4 202216$13.7bnn.a.n.a.
Q1 202319$11.5bnn.a.n.a.
Q2 202316$10.6bnn.a.n.a.
Q3 202317$9.7bnn.a.n.a.
Q4 202315$10.0bn59
Q1 202415$7.3bn106
Q2 202419$12.5bn128
Q3 202418$15.1bn711
Q4 202415$12.8bn87
Q1 202518$14.9bn117
Q2 202522$18.3bn1310
Q3 202533$26.6bn258
Q4 202524$23.4bn1528
Q1 202622$17.9bn1618
Q2 202621$15.9bn1718

Compare with…

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