Alkermes Ownership | Who Owns Alkermes?

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Alkermes Ownership Summary

Alkermes is owned by 17.00% institutional investors, 1.57% insiders, and 81.43% retail investors. Blackrock is the largest institutional shareholder, holding 17.33% of ALKS shares. iShares Core S&P Small-Cap ETF is the top mutual fund, with 6.00% of its assets in Alkermes shares.

ALKS Ownership Benchmark

Type	Name	% Inst	% Insiders	% Retail
Stock	Alkermes	17.00%	1.57%	81.43%
Sector	Healthcare Stocks	231.98%	10.74%	-142.72%
Industry	Biotech Stocks	381.47%	10.55%	-292.02%

Institutional Shareholders

Top Institutional Shareholders by Total Shares

Holder	Shares	% Holding	Value
Blackrock	29.11M	17.33%	$701.49M
Blackrock funding, inc. /de	28.27M	17.13%	$791.06M
Vanguard group	18.01M	10.91%	$503.85M
Price t rowe associates inc /md/	10.24M	6.21%	$307.15M
State street	8.54M	5.18%	$256.21M
Baker bros. advisors lp	8.09M	4.91%	$242.74M
Renaissance	6.67M	4.04%	$186.57M
Jpmorgan chase	5.18M	3.14%	$145.06M
Dimensional fund advisors lp	4.41M	2.67%	$123.47M
American century companies	4.40M	2.67%	$131.92M

Top Institutional Shareholders by % of Total Assets

Holder	Shares	% Assets	Value
Sio capital management	674.84K	5.12%	$20.25M
Commodore capital lp	3.10M	4.54%	$92.90M
Affinity asset advisors	1.25M	3.27%	$37.50M
Bioimpact capital	549.26K	2.70%	$16.48M
Krensavage asset management	207.82K	2.66%	$6.24M
Healthinvest partners ab	242.47K	2.16%	$6.78M
Opaleye management	450.00K	1.91%	$13.50M
Baker bros. advisors lp	8.09M	1.75%	$242.74M
Paradigm biocapital advisors lp	1.72M	1.47%	$51.58M
Stempoint capital lp	241.64K	1.45%	$7.25M

Top Buyers

Holder	Shares	% Assets	Change
Norges bank	1.95M	0.01%	1.95M
Ubs group	2.54M	0.01%	1.79M
Baker bros. advisors lp	8.09M	1.75%	1.68M
Soleus capital management	1.32M	1.36%	1.32M
Jpmorgan chase	5.18M	0.01%	1.26M

Top Sellers

Holder	Shares	% Assets	Change
Deep track capital, lp	-	-	-3.50M
Rtw investments, lp	1.67M	0.62%	-3.01M
Hardman johnston global advisors	-	-	-2.67M
Camber capital management lp	-	-	-1.50M
Armistice capital	-	-	-1.45M

New Positions

Holder	Shares	% Assets	Change	Value
Norges bank	1.95M	0.01%	1.95M	$54.44M
Soleus capital management	1.32M	1.36%	1.32M	$37.00M
Sio capital management	674.84K	5.12%	674.84K	$20.25M
Opaleye management	450.00K	1.91%	450.00K	$13.50M
Mesirow institutional investment management	376.87K	0.83%	376.87K	$10.84M

Sold Out

Holder	Change
Harbor investment advisory	-1.00
Activest wealth management	-1.00
Financial gravity asset management	-1.00
Mather group, llc.	-2.00
Transamerica financial advisors	-8.00

Institutional Ownership Trends

Date	Holdings	Change %	Shares	Change %	Ownership	Change %	Increased Position	Change %	Decreased Position	Change %
Dec 31, 2025	109	-70.05%	28,066,494	-83.45%	17	0.16%	61	-68.88%	32	-75.94%
Sep 30, 2025	135	-62.60%	35,434,318	-79.06%	21	0.20%	61	-69.19%	61	-48.74%
Jun 30, 2025	355	-6.58%	168,942,978	-0.75%	102	0.94%	194	3.19%	118	-10.61%
Mar 31, 2025	377	7.41%	169,214,033	1.17%	103	0.99%	185	6.94%	132	7.32%
Dec 31, 2024	341	-	166,201,187	-5.94%	101	0.87%	167	-3.47%	121	2.54%

Top Mutual Funds Shareholders

Holder	Shares	% Holding	Change
iShares Core S&P Small-Cap ETF	9.99M	6.00%	-1.17M
Vanguard US Total Market Shares ETF	5.16M	3.17%	-174.71K
Vanguard Total Stock Mkt Idx Inv	5.24M	3.15%	13.20K
Avantis US Small Cap Value ETF	4.50M	2.70%	22.74K
iShares Russell 2000 ETF	3.91M	2.35%	399.24K
Vanguard Small Cap Index	3.74M	2.24%	-579.00
T. Rowe Price US Mid-Cap Value Equity	3.74M	2.24%	-382.31K
T. Rowe Price Mid-Cap Value	3.74M	2.24%	-
State Street® SPDR® S&P® Biotech ETF	3.50M	2.10%	-18.76K
Pacer US Small Cap Cash Cows 100 ETF	2.98M	1.84%	-21.71K

Recent Insider Transactions

Date	Name	Role	Activity	Value
Mar 02, 2026	Parisi Samuel Joseph	VP, Finance (Interim PAO)	Sell	$201.81K
Mar 02, 2026	Nichols Christian Todd	SVP, Chief Commercial Officer	Sell	$180.00K
Mar 02, 2026	Hopkinson Craig C.	EVP R&D, Chief Medical Officer	Sell	$267.49K
Mar 02, 2026	Gaffin David Joseph	EVP, CLO, Alkermes, Inc.	Sell	$59.58K
Mar 03, 2026	Gaffin David Joseph	EVP, CLO, Alkermes, Inc.	Sell	$60.53K

Insider Transactions Trends

Date	Buy	Sell
2026 Q1	-	11
2025 Q4	-	4
2025 Q3	-	-
2025 Q2	-	2
2025 Q1	-	8

ALKS Ownership FAQ

Who Owns Alkermes?

Alkermes shareholders are primarily institutional investors at 17.00%, followed by 1.57% insiders and 81.43% retail investors. The average institutional ownership in Alkermes's industry, Biotech Stocks , is 381.47%, which Alkermes falls below.

Who owns the most shares of Alkermes?

Alkermes’s largest shareholders are Blackrock (29.11M shares, 17.33%), Blackrock funding, inc. /de (28.27M shares, 17.13%), and Vanguard group (18.01M shares, 10.91%). Together, they hold 45.36% of Alkermes’s total shares outstanding.

Does Blackrock own Alkermes?

Yes, BlackRock owns 17.33% of Alkermes, totaling 29.11M shares as of Jun 2024. This represents 0.02% of BlackRock's total assets, with a market value of 701.49M$. In the last quarter, BlackRock decreased its holdings by -60.933K shares, a -0.21% change.

Who is Alkermes’s biggest shareholder by percentage of total assets invested?

Sio capital management is Alkermes’s biggest shareholder by percentage of total assets invested, with 5.12% of its assets in 674.84K Alkermes shares, valued at 20.25M$.

Who is the top mutual fund holder of Alkermes shares?

iShares Core S&P Small-Cap ETF is the top mutual fund holder of Alkermes shares, with 6.00% of its total shares outstanding invested in 9.99M Alkermes shares.

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