$ALNY

$227.66 +$3.63 (1.62%) Close

$ALNY Overview Financial Statements SEC Filings Executives News Red Flags Capital Raising Ownership Insider Transactions Congressional Trades

Ownership

13F as of Q2 2026 · 133.8M shares outstanding

Who owns ALNY?

By type of holder

Institutions 99.5% Insiders 0.5% Everyone else 0.0%

Concentration Top 10 holders own 56.1%

FMR LLC 11.2% · Capital World Investors 8.3%

Institutional ownership

99.5%

+1.3 pts vs last qtr

Institutional holders

787

-3 vs last qtr

Net shares bought

+1.7M

by institutions in Q2 2026

New / sold out

87 / 90

positions opened vs closed

How is ownership changing?

Institutions, last 8 quarters

Biggest buyers in Q2 2026

Norges Bank NEW +2.3M
Deep Track Capital, LP NEW +825.0K

Biggest sellers in Q2 2026

Jpmorgan Chase & Co −3.6M
Marshall Wace, LLP −839.5K

Who is planning to sell?

Notices of proposed sale, last 12 months

$24.5M

12 notices from 6 people

Shares covered

61.1K

0.05% of the company

Arranged in advance

98%

of the value is under a 10b5-1 plan

Under a 10b5-1 plan No plan

Largest proposed sellers

Greenstreet Yvonne Officer 10b5-1 $11.6M
Fitzgerald Kevin Joseph Officer 10b5-1 $7.71M

Every notice on Red Flags →

A Form 144 is notice of a planned sale, not the sale itself. What insiders actually sold is on Insider Transactions.

Is your stake being diluted?

Diluted share count, FY2019–FY2025

+23.3%

+3.55% a year

Each share's claim on the business

−18.9%

shrank without buying or selling a share

Spent on buybacks vs paid in stock

— vs $1.55B

over 7 fiscal years

Diluted shares, split-adjusted

Buybacks Stock-based comp

How patient are the owners?

Institutional shares by how long they've been held

5+ years71% 3–5 years14% 1–3 years9% Under 1 year6%

Quarterly turnover

8.0%

of institutional shares changed hands

Top 10 managers, median time held

5 years

Super Investors

Investment managers reporting ALNY on Form 13F

Holder	Shares	% of company	Change vs last qtr	Held since	% of their book
F FMR LLC	15.0M	11.23%	+444.8K (+3.1%)	≤2021	0.2%
Shares held by quarter Peak holding16.8M (Q3'25) Change over 8 quarters+351.7K Share of the company11.230% FMR LLC's full portfolio →
CW Capital World Investors	11.1M	8.33%	+342.5K (+3.2%)	≤2021	0.4%
Shares held by quarter Peak holding16.8M (Q2'25) Change over 8 quarters−5.4M Share of the company8.330% Capital World Investors's full portfolio →

FMR LLC

15.0M

% of company

11.23%

Change vs last qtr

+444.8K (+3.1%)

Held since

≤2021

Capital World Investors

11.1M

% of company

8.33%

Change vs last qtr

+342.5K (+3.2%)

Held since

≤2021

28 more super investors behind a free account

See every manager holding Alnylam Pharmaceuticals, Inc., how their position has changed, and how long they've held it.

Institutional Funds

Mutual funds and ETFs reporting ALNY on Form N-PORT; together they hold 54.7% of the company

Fund	Position value	Shares	% of company	% of the fund	As of
GF Growth Fund of America Growth Fund of America	$2.32B	7.7M	5.73%	0.64%	May 31, 2026
VT Vanguard Total Stock Market Index Fund Vanguard Index Funds	$1.28B	4.2M	3.17%	0.06%	June 30, 2026

Growth Fund of America

Position value

$2.32B

% of company

5.73%

% of the fund

0.64%

As of

May 31, 2026

Vanguard Total Stock Market Index Fund

Vanguard Index Funds

Position value

$1.28B

% of company

3.17%

% of the fund

0.06%

As of

June 30, 2026

23 more funds behind a free account

See every fund holding Alnylam Pharmaceuticals, Inc. and how much of the fund the position is.

Insiders and 5%+ holders

From Forms 3/4/5 and Schedules 13D/G

Holder	Shares	% of company	Change vs last qtr	8 quarters	Held since	% of their book
SP Sharp Philip A Insider	372.3K	0.28%	—	—	—	—
Insider holdings come from Form 3/4/5 filings, which are not quarterly. Share of the company0.280% Sharp Philip A's insider activity →
GY Greenstreet Yvonne Insider	96.2K	0.07%	—	—	—	—
Insider holdings come from Form 3/4/5 filings, which are not quarterly. Share of the company0.070% Greenstreet Yvonne's insider activity →

Sharp Philip A

Insider

372.3K

% of company

0.28%

Change vs last qtr

—

Held since

—

Greenstreet Yvonne

Insider

96.2K

% of company

0.07%

Change vs last qtr

—

Held since

—

18 more holders behind a free account

See every insider and 5%+ holder of Alnylam Pharmaceuticals, Inc..

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