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

Filing Impact

(Neutral)

Filing Sentiment

(Negative)

Form Type

Rhea-AI Filing Summary

Alkermes plc EVP and Chief Legal Officer David Joseph Gaffin reported an open-market sale of 2,034 Ordinary Shares of Alkermes on June 4, 2026 at an average price of $43.05 per share. After this transaction, he directly holds 229,524 Ordinary Shares. The sale was carried out under a pre-arranged Rule 10b5-1 trading plan that he adopted on November 19, 2025, indicating it was scheduled in advance rather than timed opportunistically.

Insider Trade Summary 10b5-1

Net Seller: 2,034 shares ($87,564)

Net Sell 1 txn

Insider Gaffin David Joseph

Role EVP, CLO, Alkermes, Inc.

Sold 2,034 shs ($88K)

Type	Security	Shares	Price	Value
Sale	Ordinary Shares	2,034	$43.05	$88K

Holdings After Transaction: Ordinary Shares — 229,524 shares (Direct, null)

Footnotes (1)

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Key Figures

Shares sold: 2,034 shares Sale price: $43.05 per share Shares held after transaction: 229,524 shares +2 more

5 metrics

Shares sold 2,034 shares Open-market sale on June 4, 2026

Sale price $43.05 per share Average price for Ordinary Shares sold

Shares held after transaction 229,524 shares Direct ownership after reported sale

Net shares sold 2,034 shares Net-sell direction in transaction summary

10b5-1 plan adoption date November 19, 2025 Rule 10b5-1 trading plan adoption

Key Terms

Rule 10b5-1 trading plan, open-market sale, Ordinary Shares, Form 4

4 terms

Rule 10b5-1 trading plan regulatory

"This sale was effected pursuant to a Rule 10b5-1 trading plan adopted by the reporting person"

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.

open-market sale financial

"transaction_action: "open-market sale""

An open-market sale is when a shareholder sells existing shares directly on a public exchange to any willing buyer, rather than through a private deal. Think of it like putting goods on a busy market stall where price is set by supply and demand; for investors it matters because such sales increase available supply, can put short-term downward pressure on the stock price, and signal changes in liquidity or investor confidence.

Ordinary Shares financial

"security_title: "Ordinary Shares""

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.

Form 4 regulatory

"INSIDER FILING DATA (Form 4):"

Form 4 is a official document that company insiders, such as executives or major shareholders, file with regulators whenever they buy or sell company shares. It provides transparency about how those with inside knowledge are trading, helping investors see if insiders are confident in the company's prospects or may be selling for personal reasons. This information can influence investor decisions by revealing insiders' perspectives on the company's value.

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Form 4 Insider Transactions: What Each Field Means →

06/04/2026 - 05:00 PM

SEC Form 4

FORM 4

UNITED 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).

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)

	Director	10% Owner
X	Officer (give title below)	Other (specify below)
	EVP, CLO, Alkermes, Inc.

2a. Foreign Trading Symbol

3. Date of Earliest Transaction (Month/Day/Year)
06/04/2026

6. Individual or Joint/Group Filing (Check Applicable Line)

X	Form 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)
1. Title of Security (Instr. 3)	2. Transaction Date (Month/Day/Year)	2A. Deemed Execution Date, if any (Month/Day/Year)	Code	V	Amount	(A) or (D)	Price		6. Ownership Form: Direct (D) or Indirect (I) (Instr. 4)	7. Nature of Indirect Beneficial Ownership (Instr. 4)
Ordinary Shares	06/04/2026		S⁽¹⁾		2,034	D	$43.05	229,524	D

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)
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)	Code	V	(A)	(D)	Date Exercisable	Expiration Date	Title	Amount or Number of Shares	8. Price of Derivative Security (Instr. 5)		10. Ownership Form: Direct (D) or Indirect (I) (Instr. 4)	11. Nature of Indirect Beneficial Ownership (Instr. 4)

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 Gaffin	06/04/2026
	** Signature of Reporting Person	Date
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

FAQ

What insider transaction did Alkermes (ALKS) report for David Joseph Gaffin?

Alkermes reported that EVP and Chief Legal Officer David Joseph Gaffin sold 2,034 Ordinary Shares in an open-market transaction. The sale occurred at an average price of $43.05 per share as disclosed in the Form 4 filing.

At what price did the Alkermes (ALKS) insider shares sell in this Form 4?

The reported Alkermes insider sale was executed at an average price of $43.05 per Ordinary Share. This price reflects the consideration received per share in the open-market transaction disclosed for David Joseph Gaffin.

How many Alkermes (ALKS) shares does David Joseph Gaffin hold after the sale?

Following the reported transaction, David Joseph Gaffin directly holds 229,524 Ordinary Shares of Alkermes. This post-transaction balance shows that the 2,034 shares sold represent a small portion of his total reported holdings.

Was the Alkermes (ALKS) insider sale made under a Rule 10b5-1 plan?

Yes. The Form 4 notes the sale was effected under a Rule 10b5-1 trading plan adopted by David Joseph Gaffin on November 19, 2025. Such plans pre-schedule trades, reducing the significance of transaction timing.

What role does the insider in this Alkermes (ALKS) Form 4 hold?

The reporting person, David Joseph Gaffin, serves as Executive Vice President and Chief Legal Officer of Alkermes, Inc. His officer status is disclosed in the filing, indicating a senior leadership role within the company.