[Form 4] STERIS plc Insider Trading Activity

Rhea-AI Filing Summary

Director and CEO Daniel A. Carestio reported a small open-market sale of 159 ordinary shares on 10/06/2025 at a price of $241.82 per share, leaving beneficial ownership of 51,096 shares. The filing indicates 33,054 of those shares are restricted with scheduled lapses: 06/01/2026 (4,308), 06/02/2026 (2,369), 06/03/2026 (5,937), 06/04/2026 (4,283), 06/03/2027 (5,937), 06/04/2027 (4,283), and 06/05/2028 (5,937). The form is filed individually and indicates the transaction was reported under a Rule 10b5-1 plan.

Positive

• Transaction reported under a Rule 10b5-1 plan, indicating a pre-established trading arrangement
• Form filed promptly and includes a clear vesting schedule for restricted shares

Negative

• Insider sold 159 shares, reducing direct holdings (immaterial in size)
• 33,054 shares are restricted, which will vest in tranches through 06/05/2028, potentially increasing float over time

Insights

Corporate Governance Analyst

Small, routine sale by an insider under a 10b5-1 plan; majority of holdings remain restricted.

The reported sale of 159 shares at $241.82 is de minimis relative to total holdings of 51,096 shares, and the filing marks the transaction as pursuant to a Rule 10b5-1 plan, which provides a pre-established trading schedule.

The holding profile shows 33,054 restricted shares with specific vesting dates through 06/05/2028, indicating staged equity retention that ties a material portion of insider equity to future time-based milestones.

Insider Transactions Specialist

Transaction size is immaterial but disclosure and vesting schedule are investor-relevant.

The disposal code and reported price confirm an open-market sale on 10/06/2025; because only 159 shares were sold, there is no immediate material change to ownership percentage.

Investors monitoring insider alignment should note the detailed vesting timetable with multiple tranches maturing between 06/01/2026 and 06/05/2028, which could incrementally increase freely tradable shares over that horizon.

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^*

Carestio Daniel A

(Last) (First) (Middle)

70 SIR JOHN ROGERSON'S QUAY

(Street)

DUBLIN 2 L2 D02 R296

(City) (State) (Zip)

2. Issuer Name and Ticker or Trading Symbol
STERIS plc [ STE ]

5. Relationship of Reporting Person(s) to Issuer
(Check all applicable)

X	Director		10% Owner
X	Officer (give title below)		Other (specify below)
	President and CEO

3. Date of Earliest Transaction (Month/Day/Year)
10/06/2025

4. If Amendment, Date of Original Filed (Month/Day/Year)

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

X	Form filed by One Reporting Person
	Form filed by More than One Reporting Person

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	10/06/2025		S		159	D	$241.82	51,096(1)	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. As of October 6, 2025, 33,054 of these ordinary shares are restricted. The restrictions on these ordinary shares lapse as follows: 4,308 on June 1, 2026; 5,937 on June 3, 2026; 2,369 on June 2, 2026; 4,283 on June 4, 2026; 5,937 on June 3, 2027; 4,283 on June 4, 2027; and 5,937 on June 5, 2028.

Remarks:

	/s/ John P. Ubbing, Authorized Representative under Power of Attorney	10/08/2025
	** 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.

FAQ

What did the STERIS (STE) Form 4 filed by Daniel A. Carestio disclose?

It disclosed an open-market sale of 159 ordinary shares on 10/06/2025 at $241.82, leaving beneficial ownership of 51,096 shares.

Was the sale by the STE insider executed under a 10b5-1 plan?

Yes. The filing indicates the transaction was made pursuant to a Rule 10b5-1 written plan.

How many of Daniel Carestio's STERIS shares are restricted and when do they vest?

33,054 shares are restricted with vesting tranches on 06/01/2026, 06/02/2026, 06/03/2026, 06/04/2026, 06/03/2027, 06/04/2027, and 06/05/2028.

Does the Form 4 indicate a material change in ownership for STE?

No. The sale of 159 shares is minor relative to total beneficial ownership of 51,096 shares and does not indicate a material ownership change.

Who signed the Form 4 for the reporting person?

The form is signed by John P. Ubbing, as Authorized Representative under Power of Attorney, dated 10/08/2025.