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Alkermes (ALKS) EVP Gaffin sells 2,034 shares under 10b5-1 plan

Filing Impact
(Neutral)
Filing Sentiment
(Negative)
Form Type
4

Rhea-AI Filing Summary

On 2026-08-03, Alkermes plc executive David Joseph Gaffin, EVP and CLO, sold 2,034 Ordinary Shares of Alkermes at an average price of $48.58 per share. The sale, reported as a sale in the open market or a private transaction, was executed under a Rule 10b5-1 trading plan adopted on 11/19/2025, and he now directly holds 225,456 Ordinary Shares.

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Insider Gaffin David Joseph
Role EVP, CLO, Alkermes, Inc.
Sold 2,034 shs ($99K)
Type Security Shares Price Value
Sale Ordinary Shares F1 2,034 $48.58 $99K
Holdings After Transaction: Ordinary Shares — 225,456 shares (Direct)
Footnotes (1)
  1. F1. This sale was effected pursuant to a Rule 10b5-1 trading plan adopted by the reporting person on 11/19/2025.
Shares sold 2,034 shares Ordinary Shares sold on 2026-08-03
Sale price $48.58 per share Average price for Ordinary Shares sold
Shares owned after sale 225,456 shares Direct ownership immediately following the transaction
Transaction date 2026-08-03 Date of reported sale by David Joseph Gaffin
10b5-1 plan adoption date 11/19/2025 Date the Rule 10b5-1 trading plan was adopted
Rule 10b5-1 trading plan financial
"This sale was effected pursuant to a Rule 10b5-1 trading plan adopted..."
A Rule 10b5-1 trading plan is a pre-arranged schedule that allows company insiders to buy or sell stock at specific times, even if they have inside information. It helps prevent accusations of unfair trading by making these transactions look planned and transparent, rather than sneaky or illegal.
Ordinary Shares financial
"security_title: Ordinary Shares for the reported transaction"
Ordinary shares are a type of ownership stake in a company, giving shareholders a right to participate in the company’s profits and decision-making through voting. They are similar to owning a piece of a business, and their value can rise or fall based on the company's performance. Investors buy ordinary shares to potentially earn dividends and benefit from the company's growth over time.
open market or private transaction financial
"Transaction described as a sale in open market or private transaction"

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

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FAQ

What insider transaction did Alkermes (ALKS) EVP David Joseph Gaffin report?
David Joseph Gaffin reported selling 2,034 Ordinary Shares of Alkermes on 2026-08-03. The shares were sold at an average price of $48.58 each in a transaction reported as occurring in the open market or a private transaction by the executive.

At what price did Alkermes (ALKS) shares sell in this insider trade?
The reported sale was executed at an average price of $48.58 per share. This price applies to the 2,034 Ordinary Shares sold by executive David Joseph Gaffin in the transaction dated 2026-08-03, as disclosed in the Form 4 filing with the SEC.

How many Alkermes (ALKS) shares does David Joseph Gaffin hold after the sale?
Following the reported transaction, David Joseph Gaffin directly holds 225,456 Ordinary Shares of Alkermes. This figure represents his direct ownership position immediately after selling 2,034 shares in the Rule 10b5-1 plan trade on 2026-08-03, as reported to regulators in the insider ownership table.

Was the Alkermes (ALKS) insider sale made under a Rule 10b5-1 plan?
Yes. The sale was effected pursuant to a Rule 10b5-1 trading plan adopted by David Joseph Gaffin on 11/19/2025. Such plans pre-arrange trades and can reduce the informational value of transaction timing for investors, according to the disclosure filed with regulators.

What role does David Joseph Gaffin hold at Alkermes (ALKS)?
David Joseph Gaffin serves as Executive Vice President and Chief Legal Officer of Alkermes, Inc. In this capacity, he is an officer of the company and his Ordinary Share transactions are reportable as insider trades under securities regulations to the SEC.
SEC Form 4
FORM 4UNITED STATES SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

STATEMENT OF CHANGES IN BENEFICIAL OWNERSHIP

Filed pursuant to Section 16(a) of the Securities Exchange Act of 1934
or Section 30(h) of the Investment Company Act of 1940
OMB APPROVAL
OMB Number:3235-0287
Estimated average burden
hours per response:0.5
Check this box if no longer subject to Section 16. Form 4 or Form 5 obligations may continue. See Instruction 1(b).
X
Check this box to indicate that a transaction was made pursuant to a contract, instruction or written plan for the purchase or sale of equity securities of the issuer that is intended to satisfy the affirmative defense conditions of Rule 10b5-1(c). See Instruction 10.
1. Name and Address of Reporting Person*
Gaffin David Joseph
(Last)(First)(Middle)
900 WINTER STREET
(Street)
WALTHAM MASSACHUSETTS 02451
(City)(State)(Zip)
UNITED STATES
(Country)		2. Issuer Name and Ticker or Trading Symbol
Alkermes plc. [ ALKS ] 		5. Relationship of Reporting Person(s) to Issuer
(Check all applicable)
Director10% Owner
XOfficer (give title below)Other (specify below)
EVP, CLO, Alkermes, Inc.
2a. Foreign Trading Symbol
3. Date of Earliest Transaction (Month/Day/Year)
08/03/2026		6. Individual or Joint/Group Filing (Check Applicable Line)
XForm filed by One Reporting Person
Form filed by More than One Reporting Person
4. If Amendment, Date of Original Filed (Month/Day/Year)

Table I - Non-Derivative Securities Acquired, Disposed of, or Beneficially Owned
1. Title of Security (Instr. 3) 2. Transaction Date (Month/Day/Year)2A. Deemed Execution Date, if any (Month/Day/Year)3. Transaction Code (Instr. 8) 4. Securities Acquired (A) or Disposed Of (D) (Instr. 3, 4 and 5) 5. Amount of Securities Beneficially Owned Following Reported Transaction(s) (Instr. 3 and 4) 6. Ownership Form: Direct (D) or Indirect (I) (Instr. 4) 7. Nature of Indirect Beneficial Ownership (Instr. 4)
CodeVAmount(A) or (D)Price
Ordinary Shares08/03/2026S(1)2,034D$48.58225,456D
Table II - Derivative Securities Acquired, Disposed of, or Beneficially Owned
(e.g., puts, calls, warrants, options, convertible securities)
1. Title of Derivative Security (Instr. 3) 2. Conversion or Exercise Price of Derivative Security 3. Transaction Date (Month/Day/Year)3A. Deemed Execution Date, if any (Month/Day/Year)4. Transaction Code (Instr. 8) 5. Number of Derivative Securities Acquired (A) or Disposed of (D) (Instr. 3, 4 and 5) 6. Date Exercisable and Expiration Date (Month/Day/Year)7. Title and Amount of Securities Underlying Derivative Security (Instr. 3 and 4) 8. Price of Derivative Security (Instr. 5) 9. Number of derivative Securities Beneficially Owned Following Reported Transaction(s) (Instr. 4) 10. Ownership Form: Direct (D) or Indirect (I) (Instr. 4) 11. Nature of Indirect Beneficial Ownership (Instr. 4)
CodeV(A)(D)Date ExercisableExpiration DateTitleAmount or Number of Shares
Explanation of Responses:
1. This sale was effected pursuant to a Rule 10b5-1 trading plan adopted by the reporting person on 11/19/2025.
/s/ Shantale Greenson, attorney-in-fact for David Joseph Gaffin08/03/2026
** Signature of Reporting PersonDate
Reminder: Report on a separate line for each class of securities beneficially owned directly or indirectly.
* If the form is filed by more than one reporting person, see Instruction 4 (b)(v).
** Intentional misstatements or omissions of facts constitute Federal Criminal Violations See 18 U.S.C. 1001 and 15 U.S.C. 78ff(a).
Note: File three copies of this Form, one of which must be manually signed. If space is insufficient, see Instruction 6 for procedure.
Persons who respond to the collection of information contained in this form are not required to respond unless the form displays a currently valid OMB Number.
* Form 4: SEC 1474 (03-26)

Source: View Original Filing on SEC EDGAR