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

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 on July 6, 2026 at $54.03 per share. The transaction was executed under a pre-arranged Rule 10b5-1 trading plan adopted on November 19, 2025. Following this sale, he directly holds 227,490 Ordinary Shares, so the transaction represents only a small fraction of his overall position.

Insider Trade Summary 10b5-1

Net Seller: 2,034 shares ($109,897)

Net Sell 1 txn

Insider Gaffin David Joseph

Role EVP, CLO, Alkermes, Inc.

Sold 2,034 shs ($110K)

Type	Security	Shares	Price	Value
Sale	Ordinary Shares	2,034	$54.03	$110K

Holdings After Transaction: Ordinary Shares — 227,490 shares (Direct, null)

Footnotes (1)

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Key Figures

Shares sold: 2,034 shares Sale price per share: $54.03 per share Shares held after transaction: 227,490 shares +3 more

6 metrics

Shares sold 2,034 shares Open-market sale on July 6, 2026

Sale price per share $54.03 per share Ordinary Shares transaction

Shares held after transaction 227,490 shares Direct ownership following sale

Transaction code S Open-market or private sale of non-derivative securities

Net share direction -2,034 shares Net-sell across reported transactions

Trading plan adoption date November 19, 2025 Rule 10b5-1 plan used for this sale

Key Terms

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

5 terms

Ordinary Shares financial

"reported an open-market sale of 2,034 Ordinary Shares on July 6, 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.

open-market sale financial

"reported an open-market sale of 2,034 Ordinary Shares"

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.

Rule 10b5-1 trading plan regulatory

"executed under a pre-arranged 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.

Form 4 regulatory

"routine insider sale disclosed in a Form 4 filing with updated"

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.

beneficial ownership financial

"updated post-transaction holdings reflect his beneficial ownership stake"

Beneficial ownership means the person or entity that actually enjoys the benefits of owning shares or other assets — such as receiving dividends, voting rights, or price gains — even if the legal title is held in another name. For investors it matters because knowing who truly controls and profits from a company reveals who can influence decisions, exposes potential conflicts of interest or hidden concentration of power, and affects transparency and risk in the stock.

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Form 4 Insider Transactions: What Each Field Means →

Available on EDGAR 07/06/2026 - 04:48 PM Accepted by SEC EDGAR 07/06/2026 - 04:48 PM Learn about SEC filing dates

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 $54.03 per share. This was a routine insider sale disclosed in a Form 4 filing with updated post-transaction holdings.

At what price did Alkermes (ALKS) executive David Gaffin sell shares?

David Gaffin sold Alkermes Ordinary Shares at a price of $54.03 per share. The transaction involved 2,034 shares in an open-market sale and was reported in a Form 4 insider trading disclosure filed with the SEC.

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

After selling 2,034 Ordinary Shares, David Gaffin directly holds 227,490 Alkermes shares. This updated ownership level reflects his remaining stake following the July 6, 2026 open-market transaction disclosed in the Form 4 filing.

Was David Gaffin’s Alkermes (ALKS) share sale under a Rule 10b5-1 plan?

Yes. The filing states that David Gaffin’s sale of 2,034 Alkermes Ordinary Shares was effected under a Rule 10b5-1 trading plan adopted on November 19, 2025. Such plans pre-schedule trades to help separate them from day-to-day market timing decisions.

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. His position makes his equity transactions subject to SEC reporting, which is why his sale of Ordinary Shares appears in this Form 4 filing.

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)
07/06/2026

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	07/06/2026		S(1)		2,034	D	$54.03	227,490	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	07/06/2026
	** 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)