What is David Joseph Gaffin’s role at Alkermes related to this ALKS Form 4?

The reporting person, David Joseph Gaffin, serves as executive vice president and chief legal officer of Alkermes, Inc., an officer role associated with Alkermes plc. in the Form 4.

Alkermes legal chief sells 2,034 shares at $48.01

Q: What insider transaction did ALKS report for David Joseph Gaffin on September 3, 2026?

Alkermes reported that David Joseph Gaffin sold 2,034 Ordinary Shares on September 3, 2026 in a market transaction at $48.01 per share, made under a Rule 10b5-1 trading plan.

Filing Impact

(Neutral)

Filing Sentiment

(Negative)

Form Type

Rhea-AI Filing Summary

Alkermes plc. (ALKS) reported that executive vice president and chief legal officer David Joseph Gaffin sold 2,034 Ordinary Shares on September 3, 2026 at $48.01 per share in a market transaction. After this sale, he holds 223,422 Ordinary Shares directly, and the transaction was made under a Rule 10b5-1 trading plan adopted on November 19, 2025.

Insider Trade Summary 10b5-1

Net Seller: 2,034 shares

Net Sell 1 txn

Insider Gaffin David Joseph

Role EVP, CLO, Alkermes, Inc.

Sold 2,034 shs ($98K)

Type	Security	Shares	Price	Value
Sale	Ordinary Shares ^F1	2,034	$48.01	$98K

Holdings After Transaction: Ordinary Shares — 223,422 shares (Direct)

Footnotes (1)

F1. This sale was effected pursuant to a Rule 10b5-1 trading plan adopted by the reporting person on 11/19/2025.

Key Figures

Shares sold: 2,034 shares Sale price per share: $48.01 per share Shares held after transaction: 223,422 shares +1 more

4 metrics

Shares sold 2,034 shares Ordinary Shares sold on September 3, 2026 by David Joseph Gaffin

Sale price per share $48.01 per share Price for the September 3, 2026 sale of 2,034 Ordinary Shares

Shares held after transaction 223,422 shares Direct holdings of David Joseph Gaffin after the reported sale

Rule 10b5-1 plan adoption date November 19, 2025 Adoption date of the trading plan under which the sale was effected

Key Terms

Rule 10b5-1 trading plan, Ordinary Shares, executive vice president, chief legal officer

4 terms

Rule 10b5-1 trading plan regulatory

"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

"The reporting person sold 2,034 Ordinary Shares on September 3, 2026"

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.

executive vice president other

"The reporting person serves as executive vice president and chief legal officer"

An executive vice president is a high-ranking leader within a company who oversees major parts of its operations or strategies. Think of them as senior managers responsible for important areas, similar to a vice principal in a school hierarchy. Their role matters to investors because they help guide the company's success and decision-making at the top level.

chief legal officer regulatory

"The reporting person serves as executive vice president and chief legal officer"

A chief legal officer is a senior executive responsible for overseeing a company's legal matters, ensuring that its activities comply with laws and regulations. They act like a company's legal guide, helping to prevent legal problems and manage risks. For investors, understanding this role is important because it reflects how well a company manages legal risks that could impact its stability and reputation.

FAQ

What insider transaction did ALKS report for David Joseph Gaffin on September 3, 2026?

Alkermes reported that David Joseph Gaffin sold 2,034 Ordinary Shares on September 3, 2026 in a market transaction at $48.01 per share, made under a Rule 10b5-1 trading plan.

How many Alkermes (ALKS) shares does David Joseph Gaffin hold after this transaction?

After the September 3, 2026 sale, David Joseph Gaffin directly holds 223,422 Ordinary Shares of Alkermes. This figure reflects his position immediately following the reported transaction.

At what price were the ALKS shares sold in David Joseph Gaffin’s September 3, 2026 trade?

The reported sale by David Joseph Gaffin on September 3, 2026 was executed at a price of $48.01 per share for 2,034 Ordinary Shares.

Was the September 3, 2026 ALKS insider sale made under a Rule 10b5-1 trading plan?

Yes. The filing states that the September 3, 2026 sale was effected pursuant to a Rule 10b5-1 trading plan adopted by David Joseph Gaffin on November 19, 2025.

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

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Available on EDGAR 09/03/2026 - 06:40 PM Accepted by SEC EDGAR 09/03/2026 - 06:32 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)
09/03/2026

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	09/03/2026		S⁽¹⁾		2,034	D	$48.01	223,422	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	09/03/2026
	** 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