Alkermes plc.

ALKSNASDAQ

$41.75+1.21 (+2.98%)as of Oct 2, 2026

Legend

Insider buy

Insider sell

Congress buy

Congress sell

Hedge Funds
bought vs soldGreener markers show more buyers; redder markers show more sellers.

Company share activityNet buybacksNo changeNet dilution

Marker size reflects transaction size.

Insider buy
Insider sell
Congress buy
Congress sell
Hedge Funds bought vs sold

Share activityNet buybacksNo changeNet dilution

Marker size reflects transaction size. Greener fund markers mean more buyers.

Insider Buy
Insider Sell
Congress Buy
Congress Sell
Hedge funds bought vs sold
BuybackNo changeNet dilution

Alkermes plc. price and activity chart data

Showing the 1Y range: Oct 2, 2025 to Oct 2, 2026. Price (+33.6%). 0 insider or congressional trades plotted in this window as 0 markers; nearby trades of the same kind are grouped.

Transactions plotted on the price chart
Date	Category	Person	Role	Action	Amount	Change in holding

Largest institutional holders

13F · Q2 2026

Fund	% of company held	Value	% of portfolio	Quarterly activity
BlackRock, Inc.	17.45%	$1.53B	0.02%	Not reported
Baker Bros. Advisors LP	5.98%	$525M	2.63%	Not reported
Vanguard Portfolio Management LLC	5.66%	$497M	0.02%	Not reported
State Street Corp	5.47%	$480M	0.01%	Not reported
Vanguard Capital Management LLC	4.49%	$394M	0.01%	Not reported
Renaissance Technologies LLC	3.86%	$339M	0.47%	Not reported
Geode Capital Management, LLC	2.67%	$235M	0.01%	Not reported
Dimensional Fund Advisors LP	2.50%	$220M	0.04%	Not reported
Deep Track Capital, LP	2.39%	$210M	3.05%	Add 11.41%
American Century Companies Inc	2.36%	$207M	0.09%	Not reported
Holocene Advisors, LP	2.15%	$189M	0.43%	Add 55.41%
Commodore Capital LP	1.79%	$157M	9.36%	Reduce 28.57%
Wellington Management Group LLP	1.68%	$147M	0.03%	Reduce 5.23%
Primecap Management Co	1.51%	$132M	0.08%	Reduce 0.45%
First Trust Advisors LP	1.45%	$127M	0.07%	Reduce 18.45%
Charles Schwab Investment Management Inc	1.39%	$122M	0.02%	Not reported
Nuveen, LLC	1.39%	$122M	0.03%	Not reported
Norges Bank	1.29%	$113M	0.01%	Not reported
BVF Inc	1.29%	$113M	2.89%	Add 7.74%
Goldman Sachs Group Inc	1.21%	$106M	0.01%	Not reported
Bain Capital Life Sciences Investors, LLC	1.16%	$102M	6.04%	Add 217.69%
Northern Trust Corp	1.09%	$96M	0.01%	Not reported
Morgan Stanley	1.05%	$91.8M	0.00%	Not reported
RTW Investments, LP	1.00%	$87.6M	0.75%	Not reported
Citadel Advisors LLC	0.98%	$86.2M	0.01%	Not reported
Loomis Sayles & Co L P	0.95%	$83.1M	0.10%	Reduce 11.15%
Adage Capital Partners GP, L.L.C.	0.82%	$71.7M	0.10%	New Not reported
D. E. Shaw & Co., Inc.	0.78%	$68.7M	0.03%	Not reported
Driehaus Capital Management LLC	0.74%	$64.9M	0.38%	Add 56.42%
Vanguard Fiduciary Trust Co	0.70%	$61.7M	0.01%	Not reported
BNP PARIBAS ASSET MANAGEMENT Holding S.A.	0.69%	$60.7M	0.06%	Add 383.67%
FMR LLC	0.68%	$59.4M	0.00%	Not reported
Affinity Asset Advisors, LLC	0.67%	$58.9M	2.66%	Reduce 16.67%
Bank of New York Mellon Corp	0.65%	$57.5M	0.01%	Not reported
T. Rowe Price Investment Management, Inc.	0.65%	$57.2M	0.04%	Add 21.99%
Two Sigma Investments, LP	0.62%	$54.4M	0.04%	Not reported
Soleus Capital Management, L.P.	0.61%	$53.9M	1.86%	Not reported
Principal Financial Group Inc	0.59%	$51.5M	0.03%	Not reported
Marshall Wace, LLP	0.58%	$50.8M	0.04%	Not reported
Summit Partners Public Asset Management, LLC	0.57%	$49.8M	0.88%	New Not reported
Bank of America Corp	0.55%	$48.1M	0.00%	Not reported
Victory Capital Management Inc	0.55%	$48M	0.03%	Not reported
Pictet Asset Management Holding SA	0.50%	$44M	0.04%	Reduce 11.05%
Artisan Partners Limited Partnership	0.50%	$43.5M	0.07%	Reduce 25.25%
Panagora Asset Management Inc	0.46%	$40.1M	0.12%	Not reported
Frazier Life Sciences Management, L.P.	0.42%	$36.7M	0.80%	Not reported
Public Sector Pension Investment Board	0.40%	$35.5M	0.09%	Not reported
Frontier Capital Management Co LLC	0.39%	$34.6M	0.32%	New Not reported
BNP Paribas Financial Markets	0.39%	$34.3M	0.01%	Not reported
Ameriprise Financial Inc	0.38%	$33M	0.01%	Not reported

50 of 394 holders

Activity score

Premium

100

WEAK

STRONG

Unlock

AI Activity Analysis

Premium

Coming soonAI reads of insider, institutional and company activity will appear here for Premium accounts.

Historical Activity Patterns

Premium

Historical Activity PatternsHistorical periods where multiple activity categories converged, with subsequent market performance shown for context.Unlock