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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

Q3 2026: 5 of 95 managers have filed so far; the filing deadline is 16 November 2026. Its figures cover those filers only, so it is not yet a picture of the tracked managers.

Quarter end
30 Sep 2026
the date the book describes
Filed
9 Nov 2026
latest of these filings; the earliest 9 Nov 2026
Managers listing it
2
at least, of 95 tracked, among listed positions
Comparable managers
5
filed both Q2 2026 and Q3 2026; 1 listed it in both
Shares listed
5,497,227
combined, among listed positions
Reported value
$1.4bn
combined, at the quarter end

Among the 5 comparable managers: 2 buyers (opened or added shares) and 1 seller (trimmed or exited), at least, among listed positions. Their net change in shares was +2,822,718.

Managers listing ALNY in Q3 2026

Share of 13F value is the position’s reported value over everything the manager reported that quarter. The share change is against Q2 2026, and only where both filings list the position. A rise in value with no rise in shares is the price, not buying.

2 of 2 holders

ActionFiling
Baillie Gifford & Co5,492,469$1.4bn1.28%Added+3,052,5809 Nov 2026 (the filing on sec.gov)
Acadian Asset Management LLC4,758$1.2munder 0.1%Added+4,1379 Nov 2026 (the filing on sec.gov)

Largest increases and reductions, by shares

Q2 2026 to Q3 2026, among managers that listed it in both quarters or opened it.

Increases

Reductions

No reduction among listed positions.

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 (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.
15 in Q4 2024 to 1 in Q3 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
Q3 20261$1.4bn21

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 →