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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
30 Sep 2025
the date the book describes
Filed
27 Oct 2026
latest of these filings; the earliest 29 Oct 2025
Managers listing it
33
at least, of 95 tracked, among listed positions
Comparable managers
95
filed both Q2 2025 and Q3 2025; 17 listed it in both
Shares listed
58,415,962
combined, among listed positions
Reported value
$26.6bn
combined, at the quarter end

Among the 95 comparable managers: 25 buyers (opened or added shares) and 8 sellers (trimmed or exited), at least, among listed positions. Their net change in shares is not known from listed positions, because at least one of them lists it in only one of the two quarters.

Managers listing ALNY in Q3 2025

Share of 13F value is the position’s reported value over everything the manager reported that quarter. The share change is against Q2 2025, and only where both filings list the position. A rise in value with no rise in shares is the price, not buying.

33 of 33 holders

ActionFiling
Fidelity (FMR LLC)16,767,625$7.6bn0.40%Added+961,10413 Nov 2025 (the filing on sec.gov)
Capital World Investors16,434,253$7.5bn1.02%Trimmed-370,75413 Nov 2025 (the filing on sec.gov)
Capital Research Global Investors7,222,840$3.3bn0.62%Added+31,18413 Nov 2025 (the filing on sec.gov)
Baillie Gifford & Co2,789,356$1.3bn0.94%Trimmed-242,53531 Oct 2025 (the filing on sec.gov)
Dodge & Cox2,321,230$1.1bn0.57%Trimmed-875,86613 Nov 2025 (the filing on sec.gov)
Wellington Management Group LLP1,826,321$833m0.15%Trimmed-249,43114 Nov 2025 (the filing on sec.gov)
T. Rowe Price Associates Inc1,800,294$821m0.09%Trimmed-1,344,71214 Nov 2025 (the filing on sec.gov)
Invesco Ltd1,481,842$676m0.11%Added+140,14813 Nov 2025 (the filing on sec.gov)
Arrowstreet Capital LP1,355,609$618m0.39%Added+1,185,90913 Nov 2025 (the filing on sec.gov)
Jane Street Group LLC958,750$437m0.07%Addedn.a.14 Nov 2025 (the filing on sec.gov)
Two Sigma Advisers LP892,500$407m0.81%Added+626,40014 Nov 2025 (the filing on sec.gov)
AQR Capital Management LLC744,008$336m0.22%Added+555,75914 Nov 2025 (the filing on sec.gov)
Two Sigma Investments LP595,926$272m0.40%Added+252,62114 Nov 2025 (the filing on sec.gov)
Susquehanna International Group LLP577,632$263munder 0.1%Addedn.a.14 Nov 2025 (the filing on sec.gov)
Millennium Management LLC549,931$251m0.11%Addedn.a.14 Nov 2025 (the filing on sec.gov)
Marshall Wace LLP508,371$232m0.24%Added+269,79813 Nov 2025 (the filing on sec.gov)
Voloridge Investment Management LLC356,806$163m0.55%Addedn.a.14 Nov 2025 (the filing on sec.gov)
MFS Investment Management356,529$163m0.05%Newnew29 Oct 2025 (the filing on sec.gov)
D. E. Shaw & Co.199,417$91m0.05%Addedn.a.14 Nov 2025 (the filing on sec.gov)
Squarepoint Ops LLC145,565$66m0.07%Addedn.a.14 Nov 2025 (the filing on sec.gov)
Janus Henderson Group Ltd135,855$62munder 0.1%Trimmed-14,56614 Nov 2025 (the filing on sec.gov)
Neuberger Berman Group LLC130,544$60munder 0.1%Addedn.a.27 Oct 2026 (the filing on sec.gov)
Woodline Partners LP91,791$42m0.20%Trimmed-531,32414 Nov 2025 (the filing on sec.gov)
Man Group PLC71,673$33m0.06%Addedn.a.14 Nov 2025 (the filing on sec.gov)
Bridgewater Associates LP33,911$15m0.06%Newnew13 Nov 2025 (the filing on sec.gov)
Page 1 of 2

Largest increases and reductions, by shares

Q2 2025 to Q3 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 (8)

Exited (0)

No exit shown by a manager’s own filing.

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…

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

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

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 →