Alkermes (ALKS) CLO David Gaffin sells 2,034 shares, retains 231,558

Rhea-AI Filing Summary

Alkermes plc executive David Joseph Gaffin, EVP and Chief Legal Officer of Alkermes, Inc., reported an open-market sale of 2,034 Ordinary Shares at $33.20 per share. The transaction was made under a pre-arranged Rule 10b5-1 trading plan adopted by the reporting person. Following this sale, he continues to hold 231,558 Ordinary Shares directly, indicating a substantially larger remaining equity position in the company.

Insider Trade Summary 10b5-1

Net Seller: 2,034 shares ($67,529)

Net Sell 1 txn

Insider Gaffin David Joseph

Role EVP, CLO, Alkermes, Inc.

Sold 2,034 shs ($68K)

Type	Security	Shares	Price	Value
Sale	Ordinary Shares	2,034	$33.20	$68K

Holdings After Transaction: Ordinary Shares — 231,558 shares (Direct, null)

Footnotes (1)

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Key Figures

Shares sold: 2,034 shares Sale price per share: $33.20 per share Shares held after transaction: 231,558 shares +1 more

4 metrics

Shares sold 2,034 shares Open-market sale of Ordinary Shares on 2026-05-04

Sale price per share $33.20 per share Price for 2,034 Ordinary Shares sold

Shares held after transaction 231,558 shares Direct Ordinary Share holdings following the sale

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

Key Terms

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

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.

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.

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 Insider Transactions: What Each Field Means →

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).

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)

	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)
05/04/2026

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)
			Code	V	Amount	(A) or (D)	Price
Ordinary Shares	05/04/2026		S(1)		2,034	D	$33.2	231,558	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)
				Code	V	(A)	(D)	Date Exercisable	Expiration Date	Title	Amount 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 Gaffin	05/04/2026
	** 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)

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 at $33.20 per share. This was disclosed in a Form 4 filing detailing his direct holdings after the sale.

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

After selling 2,034 Ordinary Shares, David Joseph Gaffin directly holds 231,558 Alkermes Ordinary Shares. This post-transaction figure in the Form 4 shows he retains a substantially larger position than the number of shares sold in the reported trade.

Was the Alkermes (ALKS) insider sale by David Joseph Gaffin part of a trading plan?

Yes. The Form 4 footnote states the 2,034-share 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 any single transaction’s timing.

At what price were the Alkermes (ALKS) shares sold in David Joseph Gaffin’s Form 4 filing?

The Form 4 shows David Joseph Gaffin’s 2,034 Ordinary Shares were sold at a price of $33.20 per share. This reflects an open-market sale and provides investors with a clear reference point for the transaction’s share-level pricing.

What does the Form 4 transaction code "S" mean for Alkermes (ALKS) insider David Joseph Gaffin?

In this Form 4, transaction code "S" indicates a sale in the open market or a private transaction. For David Joseph Gaffin, it corresponds to selling 2,034 Alkermes Ordinary Shares, as part of a pre-arranged Rule 10b5-1 trading plan.