Alkermes insider plans stock sales via Merrill Lynch

Alkermes plc insider David Gaffin plans potential sales of Alkermes common stock through Merrill Lynch, with an aggregate market value of $98,811.72 and reference to 167,763,272 shares outstanding as of 08/03/2026.

Rhea-AI Filing Summary

Alkermes plc insider David Gaffin plans potential sales of Alkermes common stock through Merrill Lynch, with an aggregate market value of $98,811.72 and reference to 167,763,272 shares outstanding as of 08/03/2026. The shares relate to prior restricted stock unit and performance share unit awards granted under the issuer’s equity compensation plan that vested between 2014 and 2016. Gaffin has also reported multiple open-market sales of 2,034 shares each month from April through July 2026, with gross proceeds ranging from $70,315.38 to $109,897.02.

Key Figures

Aggregate market value of planned sales: $98,811.72 Shares outstanding: 167,763,272 shares Prior RSU vesting 1: 221 shares +5 more

8 metrics

Aggregate market value of planned sales $98,811.72 Value referenced for Alkermes common stock as of 08/03/2026

Shares outstanding 167,763,272 shares Alkermes common stock outstanding as of 08/03/2026

Prior RSU vesting 1 221 shares Vesting of restricted stock unit award on 05/21/2014

Prior RSU vesting 2 843 shares Vesting of restricted stock unit award on 05/28/2014

Prior RSU vesting 3 844 shares Vesting of restricted stock unit award on 05/28/2016

PSU vesting 126 shares Vesting of performance share unit awards on 10/05/2016

Sale proceeds 04/06/2026 $70,315.38 Gross proceeds from April 6, 2026 common stock sale

Sale proceeds 07/06/2026 $109,897.02 Gross proceeds from July 6, 2026 common stock sale

Key Terms

restricted stock unit, performance share unit awards, equity compensation plan, aggregate market value

4 terms

restricted stock unit financial

"Vesting of restricted stock unit award"

A restricted stock unit is a promise from a company to give an employee shares of stock after certain conditions are met, like staying with the company for a set amount of time. It’s like earning a bonus that turns into company stock once you’ve proven your commitment, making it a way to motivate and reward employees.

performance share unit awards financial

"Vesting of performance share unit awards"

equity compensation plan financial

"Granted as part of issuer equity compensation plan"

A plan by which a company gives employees, directors or contractors ownership or the right to buy ownership in the company through stock, options or similar awards — think of promising slices of the company pie as part of someone's pay. It matters to investors because these awards can change the number of shares outstanding, affect reported profits and influence management’s decisions; large or generous plans can dilute existing holders and alter incentives over time.

aggregate market value financial

"2034 | 98811.72 | 167763272 | 08/03/2026"

Aggregate market value is the combined price you would pay to buy all outstanding shares of a company or all companies in a group at current market prices — essentially the sum of each stock’s market capitalization. It matters to investors because it shows the overall size and weight of an investment or sector (like the total cost to buy every piece of a puzzle), helps compare scale across companies or markets, and influences index composition and risk exposure.

FAQ

AI-generated questions and answers. How Rhea-AI works. Not financial advice.

What does Alkermes (ALKS) insider David Gaffin disclose in this Form 144?

David Gaffin discloses planned potential sales of Alkermes common stock through Merrill Lynch, tied to equity awards that vested between 2014 and 2016, with an indicated aggregate market value of $98,811.72 as of 08/03/2026.

How many Alkermes (ALKS) shares are referenced as outstanding?

The disclosure references 167,763,272 shares of Alkermes common stock outstanding as of 08/03/2026; this figure serves as a context baseline and is not the amount being sold or registered in this notice.

What prior equity awards underlie David Gaffin’s proposed Alkermes (ALKS) stock sales?

The proposed sales relate to restricted stock unit and performance share unit awards from Alkermes that vested on 05/21/2014, 05/28/2014, 05/28/2016, and 10/05/2016, all granted as part of the issuer’s equity compensation plan.

What Alkermes (ALKS) stock sales has David Gaffin reported in the past three months?

Gaffin reports selling 2,034 shares of Alkermes common stock on each of 04/06/2026, 05/04/2026, 06/04/2026, and 07/06/2026, generating gross proceeds between $70,315.38 and $109,897.02 per transaction.

Through which broker are the planned Alkermes (ALKS) stock sales arranged?

The planned sales of Alkermes common stock are arranged through Merrill Lynch, located at 225 Liberty Street, Floor 37, New York, NY 10281, with the shares listed on NASDAQ.

Are David Gaffin’s Alkermes (ALKS) shares from an equity compensation plan?

Yes. The underlying common shares come from restricted stock unit and performance share unit awards that were explicitly noted as granted as part of the issuer equity compensation plan at Alkermes.

AI-generated analysis. How Rhea-AI works. Not financial advice.

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Available on EDGAR 08/03/2026 - 04:33 PM Accepted by SEC EDGAR 08/03/2026 - 04:32 PM Learn about SEC filing dates

Form 144 Filer Information	UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Form 144 NOTICE OF PROPOSED SALE OF SECURITIES PURSUANT TO RULE 144 UNDER THE SECURITIES ACT OF 1933
FORM 144

144: Filer Information

Filer CIK	0001675905
Filer CCC	XXXXXXXX
Is this a LIVE or TEST Filing?	LIVE TEST
Submission Contact Information
Name
Phone
E-Mail Address

144: Issuer Information

Name of Issuer	Alkermes plc.
SEC File Number	001-35299
Address of Issuer	CONNAUGHT HOUSE 1 BURLINGTON ROAD DUBLIN 4 IRELAND 00000
Phone	00-353-1-772-8000
Name of Person for Whose Account the Securities are To Be Sold	Gaffin David Joseph
See the definition of "person" in paragraph (a) of Rule 144. Information is to be given not only as to the person for whose account the securities are to be sold but also as to all other persons included in that definition. In addition, information shall be given as to sales by all persons whose sales are required by paragraph (e) of Rule 144 to be aggregated with sales for the account of the person filing this notice.
Relationship to Issuer	Officer

144: Securities Information

Title of the Class of Securities To Be Sold	Name and Address of the Broker	Number of Shares or Other Units To Be Sold	Aggregate Market Value	Number of Shares or Other Units Outstanding	Approximate Date of Sale	Name the Securities Exchange
Common Stock	Merrill Lynch 225 Liberty Street Floor 37 New York NY 10281	2034	98811.72	167763272	08/03/2026	NASDAQ

Furnish the following information with respect to the acquisition of the securities to be sold and with respect to the payment of all or any part of the purchase price or other consideration therefor:

144: Securities To Be Sold

Title of the Class	Date you Acquired	Nature of Acquisition Transaction	Name of Person from Whom Acquired	Is this a Gift?	Date Donor Acquired	Amount of Securities Acquired	Date of Payment	Nature of Payment *
Common Stock	05/21/2014	Vesting of restricted stock unit award	Alkermes plc.			221	05/21/2014	Granted as part of issuer equity compensation plan
Common Stock	05/28/2014	Vesting of restricted stock unit award	Alkermes plc.			843	05/28/2014	Granted as part of issuer equity compensation plan
Common Stock	05/28/2016	Vesting of restricted stock unit award	Alkermes plc.			844	05/28/2016	Granted as part of issuer equity compensation plan
Common Stock	10/05/2016	Vesting of performance share unit awards	Alkermes plc.			126	10/05/2016	Granted as part of issuer equity compensation plan

* If the securities were purchased and full payment therefor was not made in cash at the time of purchase, explain in the table or in a note thereto the nature of the consideration given. If the consideration consisted of any note or other obligation, or if payment was made in installments describe the arrangement and state when the note or other obligation was discharged in full or the last installment paid.

Furnish the following information as to all securities of the issuer sold during the past 3 months by the person for whose account the securities are to be sold.

144: Securities Sold During The Past 3 Months

Name and Address of Seller	Title of Securities Sold	Date of Sale	Amount of Securities Sold	Gross Proceeds
David Gaffin CONNAUGHT HOUSE 1 BURLINGTON ROAD DUBLIN 4 L2 00000	Common Stock	04/06/2026	2034	70315.38
David Gaffin CONNAUGHT HOUSE 1 BURLINGTON ROAD DUBLIN L2 00000	Common Stock	05/04/2026	2034	67528.80
David Gaffin CONNAUGHT HOUSE 1 BURLINGTON ROAD DUBLIN L2 00000	Common Stock	06/04/2026	2034	87563.70
David Gaffin CONNAUGHT HOUSE 1 BURLINGTON ROAD DUBLIN L2 00000	Common Stock	07/06/2026	2034	109897.02

144: Remarks and Signature

Remarks
Date of Notice	08/03/2026
Date of Plan Adoption or Giving of Instruction, If Relying on Rule 10b5-1	11/19/2025
ATTENTION:
The person for whose account the securities to which this notice relates are to be sold hereby represents by signing this notice that he does not know any material adverse information in regard to the current and prospective operations of the Issuer of the securities to be sold which has not been publicly disclosed. If such person has adopted a written trading plan or given trading instructions to satisfy Rule 10b5-1 under the Exchange Act, by signing the form and indicating the date that the plan was adopted or the instruction given, that person makes such representation as of the plan adoption or instruction date.
Signature	David Gaffin
ATTENTION: Intentional misstatements or omission of facts constitute Federal Criminal Violations (See 18 U.S.C. 1001)