Ticker · CUSIP 02043Q107

ALNY

ALNYLAM PHARMACEUTICALS INC

Healthcare·Biotechnology

···Share

Holders (tracked)

Combined shares

12,905,109

Combined value

$5.13B

Last close

$309.66

Quarter

2025Q4

Price is -22.1% vs the avg quarter-end implied price across tracked holders.

Price · 1Y$309.66+75.10 (+32.02%)H $491.22 · L $232.75 · Avg Vol 1.2M

Tracked holders · last 8 quarters

+1 vs previous quarter over the last 8.

SEC event timeline

28 events

T. Rowe Price trimmed2026-02-17
−97,463 shares · 2025Q4
Position
Paul Tudor Jones (Tudor Investment) opened position2026-02-17
+2,700 shares · 2025Q4
Position
Ken Griffin (Citadel Advisors) trimmed2026-02-17
−183,384 shares · 2025Q4
Position
D.E. Shaw & Co. added2026-02-17
+245,076 shares · 2025Q4
Position
AQR Capital Management added2026-02-17
+175,951 shares · 2025Q4
Position
Wellington Management trimmed2026-02-17
−197,390 shares · 2025Q4
Position
Two Sigma Investments added2026-02-17
+20,194 shares · 2025Q4
Position
Izzy Englander (Millennium Mgmt) trimmed2026-02-17
−474,501 shares · 2025Q4
Position
Steve Cohen (Point72) exited2026-02-17
−6,197 shares · 2025Q4
Position
Ray Dalio (Bridgewater Associates) added2026-02-13
+51,706 shares · 2025Q4
Position
Dodge & Cox trimmed2026-02-13
−356,815 shares · 2025Q4
Position
George Soros (Soros Fund Mgmt) exited2026-02-13
−4,295 shares · 2025Q4
Position
Norges Bank (Norway SWF) opened position2026-02-10
+2,252,775 shares · 2025Q4
Position
Baillie Gifford & Co trimmed2026-01-23
−188,377 shares · 2025Q4
Position
Steve Cohen (Point72) trimmed2025-11-14
−195,199 shares · 2025Q3
Position
Two Sigma Investments added2025-11-14
+252,621 shares · 2025Q3
Position
D.E. Shaw & Co. added2025-11-14
+91,141 shares · 2025Q3
Position
AQR Capital Management added2025-11-14
+555,759 shares · 2025Q3
Position
Izzy Englander (Millennium Mgmt) added2025-11-14
+459,486 shares · 2025Q3
Position
T. Rowe Price trimmed2025-11-14
−1,344,712 shares · 2025Q3
Position
Wellington Management trimmed2025-11-14
−249,431 shares · 2025Q3
Position
George Soros (Soros Fund Mgmt) opened position2025-11-14
+4,295 shares · 2025Q3
Position
Ron Baron (Baron Capital / BAMCO) opened position2025-11-14
+3,500 shares · 2025Q3
Position
Norges Bank (Norway SWF) exited2025-11-13
−2,032,680 shares · 2025Q3
Position
Dodge & Cox trimmed2025-11-13
−875,866 shares · 2025Q3
Position
Ray Dalio (Bridgewater Associates) opened position2025-11-13
+33,911 shares · 2025Q3
Position
Norges Bank (Norway SWF) added2025-11-12
+78,754 shares · 2024Q3
Position
Baillie Gifford & Co trimmed2025-10-31
−242,535 shares · 2025Q3
Position

Insider activity

No insider transactions in the last 30 days.

View full insider history for ALNY →

Follow-the-investor returns

If you'd copied each holder of ALNY…

Cost basis inferred from each manager's quarter-over-quarter position changes. Sorted by % return on the position they're still holding.

Investor	First in	Cost basis	Return	Position value today
Dodge & Cox	2016Q2	$82.59	+274.9%	$608.3M
Baillie Gifford & Co	2016Q1	$93.03	+232.9%	$805.4M
Wellington Management	2016Q1	$96.64	+220.4%	$504.4M
T. Rowe Price	2016Q1	$130.95	+136.5%	$527.3M
Ron Baron (Baron Capital / BAMCO)	2022Q1	$171.28	+80.8%	$1.1M
Steve Cohen (Point72)	2017Q2	$250.04	+23.8%	$2.0M
Steve Cohen (Point72)	2017Q2	$250.04	+23.8%	$2.0M
Paul Tudor Jones (Tudor Investment)	2019Q2	$339.20	-8.7%	$836K
Two Sigma Investments	2016Q1	$355.08	-12.8%	$190.8M
AQR Capital Management	2016Q1	$396.77	-22.0%	$284.9M
D.E. Shaw & Co.	2016Q1	$397.77	-22.2%	$123.0M
D.E. Shaw & Co.	2016Q1	$397.77	-22.2%	$123.0M
D.E. Shaw & Co.	2016Q1	$397.77	-22.2%	$123.0M
Izzy Englander (Millennium Mgmt)	2016Q1	$398.88	-22.4%	$23.4M
Izzy Englander (Millennium Mgmt)	2016Q1	$398.88	-22.4%	$23.4M
Izzy Englander (Millennium Mgmt)	2016Q1	$398.88	-22.4%	$23.4M
Ray Dalio (Bridgewater Associates)	2021Q2	$402.81	-23.1%	$26.5M
Ken Griffin (Citadel Advisors)	2016Q1	$403.28	-23.2%	$17.9M
Ken Griffin (Citadel Advisors)	2016Q1	$403.28	-23.2%	$17.9M
Ken Griffin (Citadel Advisors)	2016Q1	$403.28	-23.2%	$17.9M
Norges Bank (Norway SWF)	2016Q1	$757.79	-59.1%	$697.6M

Who moved on this name in 2025Q4

Position changes reported for the latest quarter, grouped by direction.

New positions2

Norges Bank (Norway SWF)
+2,252,775
$895.8M
Paul Tudor Jones (Tudor Investment)
+2,700
$1.1M

Added to4

D.E. Shaw & Co.
+245,076
$97.5M
AQR Capital Management
+175,951
$70.0M
Ray Dalio (Bridgewater Associates)
+51,706
$20.6M
Two Sigma Investments
+20,194
$8.0M

Trimmed6

Izzy Englander (Millennium Mgmt)
−474,501
$188.7M
Dodge & Cox
−356,815
$141.9M
Wellington Management
−197,390
$78.5M
Baillie Gifford & Co
−188,377
$74.9M
Ken Griffin (Citadel Advisors)
−183,384
$72.9M
T. Rowe Price
−97,463
$39K

Exited2

Steve Cohen (Point72)
−6,197
$2.8M
George Soros (Soros Fund Mgmt)
−4,295
$2.0M

Institutional ownership over time

Distinct super-investors holding this ticker · combined dollar value, by quarter.

Quarter	Holders	Shares	Combined value	Δ holders
2022Q1	17	38,827,180	$217.60B	—
2022Q2	18	38,132,234	$192.76B	+1
2022Q3	20	34,113,104	$6.83B	+2
2022Q4	16	34,651,532	$8.23B	-4
2023Q1	15	33,568,766	$6.72B	-1
2023Q2	18	32,172,127	$6.11B	+3
2023Q3	16	26,010,517	$4.61B	-2
2023Q4	14	25,219,331	$4.83B	-2
2024Q1	15	33,741,342	$5.04B	+1
2024Q2	16	33,001,688	$8.02B	+1
2024Q3	20	20,788,540	$5.72B	+4
2024Q4	18	15,268,233	$3.59B	-2
2025Q1	18	15,301,252	$4.13B	—
2025Q2	17	15,164,095	$4.94B	-1
2025Q3	20	11,308,129	$5.15B	+3
2025Q4	21	12,905,109	$5.13B	+1

Who owns ALNY

21 super-investors · 2025Q4

Tracked stake

12.91M

Combined value

$5.13B

% of shares outstanding

—

shares-out unknown

Quarter action mix

New2Added6Trim10Sold2Held1

#	Manager	Shares	Value	% of book	Last action
1	Baillie Gifford & Co	2.60M	$1.03B	0.9%	Trim−188.4K
2	Norges Bank Norway SWF	2.25M	$896M	0.1%	New+2.25M
3	Dodge & Cox	1.96M	$781M	0.4%	Trim−356.8K
4	T. Rowe Price	1.70M	$677M	0.1%	Trim−97.5K
5	Wellington Management	1.63M	$648M	0.1%	Trim−197.4K
6	AQR Capital Management	920.0K	$366M	0.2%	Added+176.0K
7	Two Sigma Investments	616.1K	$245M	0.3%	Added+20.2K
8	D.E. Shaw & Co.	444.5K	$177M	0.1%	Added+245.1K
9	D.E. Shaw & Co.	397.2K	$158M	0.1%	Added+245.1K
10	Ken Griffin Citadel Advisors	90.1K	$36M	0.0%	Trim−183.4K
11	Ray Dalio Bridgewater Associates	85.6K	$34M	0.1%	Added+51.7K
12	Izzy Englander Millennium Mgmt	75.4K	$30M	0.0%	Trim−474.5K
13	Ken Griffin Citadel Advisors	57.7K	$23M	0.0%	Trim−183.4K
14	Ken Griffin Citadel Advisors	38.5K	$15M	0.0%	Trim−183.4K
15	Izzy Englander Millennium Mgmt	9.4K	$4M	0.0%	Trim−474.5K
16	Steve Cohen Point72	6.4K	$3M	0.0%	Sold−6.2K
17	Steve Cohen Point72	4.7K	$2M	0.0%	Sold−6.2K
18	Ron Baron Baron Capital / BAMCO	3.5K	$1M	0.0%	Held
19	Paul Tudor Jones Tudor Investment	2.7K	$1M	0.0%	New+2.7K
20	D.E. Shaw & Co.	1.8K	$716K	0.0%	Added+245.1K
21	Izzy Englander Millennium Mgmt	1.6K	$636K	0.0%	Trim−474.5K

Recent moves

20 transactions

NEWPaul Tudor Jones (Tudor Investment)
+2,700 · 2025Q4
TRIMT. Rowe Price
−97,463 · 2025Q4
SOLDSteve Cohen (Point72)
−6,197 · 2025Q4
ADDAQR Capital Management
+175,951 · 2025Q4
ADDTwo Sigma Investments
+20,194 · 2025Q4
TRIMWellington Management
−197,390 · 2025Q4
ADDD.E. Shaw & Co.
+245,076 · 2025Q4
TRIMKen Griffin (Citadel Advisors)
−183,384 · 2025Q4
TRIMIzzy Englander (Millennium Mgmt)
−474,501 · 2025Q4
SOLDGeorge Soros (Soros Fund Mgmt)
−4,295 · 2025Q4
TRIMDodge & Cox
−356,815 · 2025Q4
ADDRay Dalio (Bridgewater Associates)
+51,706 · 2025Q4
NEWNorges Bank (Norway SWF)
+2,252,775 · 2025Q4
TRIMBaillie Gifford & Co
−188,377 · 2025Q4
ADDD.E. Shaw & Co.
+91,141 · 2025Q3
ADDIzzy Englander (Millennium Mgmt)
+459,486 · 2025Q3
TRIMSteve Cohen (Point72)
−195,199 · 2025Q3
ADDTwo Sigma Investments
+252,621 · 2025Q3
TRIMT. Rowe Price
−1,344,712 · 2025Q3
TRIMWellington Management
−249,431 · 2025Q3

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