Alkermes plc. (ALKS) Institutional Ownership

Institutions by Trading Activity

Ownership Statistics

168,570,149Shares Outstanding

3,626,188Shares held by institutions

$119,301,585Value of institutional holdings

100.34%Institutional ownership %

13.79%Shares Changed QoQ

340No. of institutional investors

Shares Owned by Institutions

Shares Purchased/Sold by Institutions

Ownership Summary

Recent 13F filings as of December 2025 show that 340 institutional investors hold a position in Alkermes plc. (NASDAQ:ALKS).

Institutional ownership in Alkermes edged down to 100.3% in December 2025, compared to 100.8% in September 2025.
On a quarter-over-quarter basis, institutional holdings shifted by 13.79%, with a year-over-year an increase of 1.19% in the count of filers.
A review of institutional activity for Alkermes shows 193 of 340 filers increasing their positions, while 110 reduced their stake, and 37 remained unchanged.
Collectively, institutional investors increased their stake in Alkermes to 169.14Mn shares as of December 2025, a change that is up by 20.50Mn shares quarter on quarter and up 2.01Mn shares year over year.
As of December 31, 2025, BlackRock, Inc. held Alkermes's largest shareholding position with over 28.27Mn shares, representing 16.77% of total outstanding shares.
Among the most significant buyers of Alkermes during December 2025 were WELLINGTON MANAGEMENT GROUP LLP (2.65Mn), Deep Track Capital, LP (2.00Mn), NORGES BANK (1.95Mn), BAKER BROS. ADVISORS LP (1.92Mn), UBS Group AG (1.79Mn).
Leading sellers of Alkermes stock in December 2025 included Avoro Capital Advisors LLC (840.00K), Artisan Partners Limited Partnership (760.65K), Man Group plc (584.76K), Sio Capital Management, LLC (579.49K), JANE STREET GROUP, LLC (448.51K).
The top 10 institutional holders of Alkermes for the quarter ending December 2025 included BlackRock, Inc. (28.27Mn), VANGUARD GROUP INC (18.01Mn), BAKER BROS. ADVISORS LP (10.01Mn), STATE STREET CORP (9.47Mn), RENAISSANCE TECHNOLOGIES LLC (6.67Mn), AMERICAN CENTURY COMPANIES INC (5.96Mn), JPMORGAN CHASE & CO (5.18Mn), DIMENSIONAL FUND ADVISORS LP (4.41Mn), GEODE CAPITAL MANAGEMENT, LLC (4.08Mn), Commodore Capital LP (3.55Mn).

340 Institutional Holders

3,626,188 Total Shares Held

Rows:

Download Data

Owner Name	Date	Shares Held	Change (QoQ)	Change (%)	Value (USD)
BlackRock, Inc.	31 Dec, 2025	28,272,412	300,334	1.07%	$791,062,090.00
VANGUARD GROUP INC	31 Dec, 2025	18,007,364	-172,147	-0.95%	$503,846,044.00
BAKER BROS. ADVISORS LP	31 Dec, 2025	10,012,267	1,920,916	23.74%	$280,143,231.00
STATE STREET CORP	31 Dec, 2025	9,472,858	932,507	10.92%	$265,050,567.00
RENAISSANCE TECHNOLOGIES LLC	31 Dec, 2025	6,668,028	375,500	5.97%	$186,571,423.00
AMERICAN CENTURY COMPANIES INC	31 Dec, 2025	5,956,824	1,559,353	35.46%	$166,671,997.00
JPMORGAN CHASE & CO	31 Dec, 2025	5,184,547	1,256,377	31.98%	$145,063,637.00
DIMENSIONAL FUND ADVISORS LP	31 Dec, 2025	4,412,783	714,787	19.33%	$123,466,744.00
GEODE CAPITAL MANAGEMENT, LLC	31 Dec, 2025	4,080,776	19,382	0.48%	$114,198,472.00
Commodore Capital LP	31 Dec, 2025	3,550,000	453,246	14.64%	$99,329,000.00
WELLINGTON MANAGEMENT GROUP LLP	31 Dec, 2025	3,020,442	2,645,252	705.04%	$84,511,968.00
PRIMECAP MANAGEMENT CO/CA/	31 Dec, 2025	2,564,300	-194,780	-7.06%	$71,749,112.00
UBS Group AG	31 Dec, 2025	2,544,895	1,790,729	237.44%	$71,206,162.00
Nuveen, LLC	31 Dec, 2025	2,427,028	253,552	11.67%	$67,908,244.00
GOLDMAN SACHS GROUP INC	31 Dec, 2025	2,267,588	272,643	13.67%	$63,447,113.00
CHARLES SCHWAB INVESTMENT MANAGEMENT INC	31 Dec, 2025	2,152,756	12,383	0.58%	$60,234,113.00
Deep Track Capital, LP	31 Dec, 2025	2,000,000	2,000,000	0.00%	$55,960,000.00
NORGES BANK	31 Dec, 2025	1,945,734	1,945,734	0.00%	$54,441,637.00
LOOMIS SAYLES & CO L P	31 Dec, 2025	1,902,522	-146,329	-7.14%	$53,232,566.00
MORGAN STANLEY	31 Dec, 2025	1,888,487	336,988	21.72%	$52,839,910.00

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