Luxfer director trims stake after RSU vesting

Luxfer Holdings plc director Lisa G. Trimberger reported several equity transactions involving trust-held shares.

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Rhea-AI Filing Summary

Luxfer Holdings plc director Lisa G. Trimberger reported several equity transactions involving trust-held shares. On June 11, 2026, the Lisa G. Trimberger Trust sold 4,010 Ordinary Shares in an open-market transaction at $15.05 per share, leaving 20,801 Ordinary Shares held indirectly.

On the same date, Restricted Stock Units fully vested and were exercised into 8,953 Ordinary Shares on a one-for-one basis, and 6,681 new Restricted Stock Units were granted as the annual non-discretionary award for Non-Executive Directors. These new Restricted Stock Units are scheduled to vest immediately before Luxfer’s 2027 Annual General Meeting of Shareholders.

Insider Trade Summary

Exercise and sale activity reported; no spread calculated

Exercise and Sale 4 txns

Insider Trimberger Lisa G

Role Director

Sold 4,010 shs ($60K)

Approx. gross sale proceeds $60K

Approx. exercise cost $0.00

Type	Security	Shares	Price	Value
Exercise	Restricted Stock Units	8,953	$0.00	$0.00
Grant/Award	Restricted Stock Units	6,681	$0.00	$0.00
Exercise	Ordinary Shares	8,953	$0.00	$0.00
Sale	Ordinary Shares	4,010	$15.05	$60K

Holdings After Transaction: Restricted Stock Units — 6,681 contracts (Indirect, See Footnote); Ordinary Shares — 20,801 shares (Indirect, By Lisa G. Trimberger Trust)

Footnotes (4)

F1. Restricted Stock Units convert to Ordinary Shares on a 1 for 1 basis.
F2. Owned by Lisa G. Trimberger Trust, of which the Reporting Person is the trustee and the Reporting Person's spouse is the sole beneficiary.
F3. The Restricted Stock Units fully vested on June 11, 2026. The above figure includes 331 additional Restricted Stock Units acquired from dividend equivalents. Restricted Stock Units accrue dividend equivalents, which are subject to the same terms and conditions as the underlying award and vest therewith.
F4. Represents the annual non-discretionary grant of awards to the Issuer's Non-Executive Directors in accordance with the terms of the Luxfer Holdings PLC Non-Executive Directors Equity Incentive Plan. The Restricted Stock Units vest on the day immediately preceding the Issuer's 2027 Annual General Meeting of Shareholders.

Key Figures

Shares sold: 4,010 Ordinary Shares Sale price: $15.05 per share Shares after sale: 20,801 Ordinary Shares +4 more

7 metrics

Shares sold 4,010 Ordinary Shares Open-market sale on June 11, 2026

Sale price $15.05 per share Open-market transaction for Ordinary Shares

Shares after sale 20,801 Ordinary Shares Indirectly held by Lisa G. Trimberger Trust after transactions

RSUs converted 8,953 Restricted Stock Units Converted 1-for-1 into Ordinary Shares on June 11, 2026

New RSU grant 6,681 Restricted Stock Units Annual non-discretionary grant to Non-Executive Director

Dividend equivalent RSUs 331 Restricted Stock Units Additional RSUs from dividend equivalents included in vested amount

Vesting date Day before 2027 AGM Vesting schedule for new Restricted Stock Units grant

Key Terms

Restricted Stock Units, dividend equivalents, Non-Executive Directors Equity Incentive Plan, Annual General Meeting of Shareholders, +1 more

5 terms

Restricted Stock Units financial

"The Restricted Stock Units fully vested on June 11, 2026."

Restricted stock units are a type of company reward where employees are promised shares of stock, but they only fully own these shares after meeting certain conditions, like staying with the company for a set time. They matter because they can become valuable assets and are often used to motivate employees to help the company succeed.

dividend equivalents financial

"The above figure includes 331 additional Restricted Stock Units acquired from dividend equivalents."

Payments tied to employee or contractor equity awards that mirror the cash dividends paid on the company’s stock; they give the holder the same economic benefit as owning the shares without transferring actual shares—often paid in cash or additional award units when the award becomes payable. Investors care because these payments affect a company’s compensation costs, cash flow and potential share dilution, and they signal how management is being rewarded and aligned with shareholders.

Non-Executive Directors Equity Incentive Plan financial

"grant of awards to the Issuer's Non-Executive Directors in accordance with the terms of the Luxfer Holdings PLC Non-Executive Directors Equity Incentive Plan."

Annual General Meeting of Shareholders financial

"vest on the day immediately preceding the Issuer's 2027 Annual General Meeting of Shareholders."

open-market sale financial

"Sale in open market or private transaction"

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.

FAQ

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What insider transactions did Luxfer (LXFR) director Lisa G. Trimberger report?

She reported an open-market sale of 4,010 Luxfer Ordinary Shares and multiple equity award events, including the vesting and exercise of Restricted Stock Units and a new grant of 6,681 Restricted Stock Units as a Non-Executive Director award.

How many Luxfer (LXFR) shares did the Trimberger trust sell and at what price?

The Lisa G. Trimberger Trust sold 4,010 Luxfer Ordinary Shares at $15.05 per share. This was an open-market sale, and after the transaction the trust continued to hold 20,801 Ordinary Shares indirectly for the reporting person’s benefit.

How many Luxfer (LXFR) shares did the RSUs convert into for Lisa G. Trimberger?

Restricted Stock Units converted into 8,953 Luxfer Ordinary Shares on a one-for-one basis. These RSUs fully vested on June 11, 2026, and the figure includes 331 additional units that accrued as dividend equivalents under the award’s terms.

What new Restricted Stock Units did Lisa G. Trimberger receive from Luxfer (LXFR)?

She received 6,681 new Restricted Stock Units as Luxfer’s annual non-discretionary grant for Non-Executive Directors. These units are scheduled to vest on the day immediately preceding Luxfer’s 2027 Annual General Meeting of Shareholders, subject to the plan’s standard conditions.

How many Luxfer (LXFR) Ordinary Shares does the Trimberger trust hold after these transactions?

Following the reported transactions, the Lisa G. Trimberger Trust holds 20,801 Luxfer Ordinary Shares indirectly. The reporting person is trustee of the trust, and the reporting person’s spouse is identified as the sole beneficiary of the trust in the disclosure.

How do dividend equivalents affect Lisa G. Trimberger’s Luxfer (LXFR) RSUs?

Dividend equivalents increased the vested Restricted Stock Units by 331 units. These equivalents accrue on the RSUs, are subject to the same terms and conditions as the underlying award, and vest at the same time as the corresponding Restricted Stock Units for the reporting person.

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Form 4 Insider Transactions: What Each Field Means →

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Accepted by SEC EDGAR 06/15/2026 - 07:26 AM EDT

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^*

Trimberger Lisa G

(Last)

(First)

(Middle)

LUMNS LANE

(Street)

MANCHESTER

M27 8LN

(City)

(State)

(Zip)

UNITED KINGDOM

(Country)

2. Issuer Name and Ticker or Trading Symbol
LUXFER HOLDINGS PLC [ LXFR ]

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

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

2a. Foreign Trading Symbol

3. Date of Earliest Transaction (Month/Day/Year)
06/11/2026

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	06/11/2026		M		8,953	A	⁽¹⁾	24,811	I	By Lisa G. Trimberger Trust⁽²⁾
Ordinary Shares	06/11/2026		S		4,010	D	$15.05	20,801	I	By Lisa G. Trimberger Trust⁽²⁾

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)
Restricted Stock Units	⁽¹⁾	06/11/2026		M			8,953	⁽³⁾	⁽³⁾	Ordinary Shares	8,953	⁽¹⁾	0	I	See Footnote⁽²⁾
Restricted Stock Units	⁽¹⁾	06/11/2026		A		6,681		⁽⁴⁾	⁽⁴⁾	Ordinary Shares	6,681	⁽¹⁾	6,681	I	See Footnote⁽²⁾

Explanation of Responses:

1. Restricted Stock Units convert to Ordinary Shares on a 1 for 1 basis.

2. Owned by Lisa G. Trimberger Trust, of which the Reporting Person is the trustee and the Reporting Person's spouse is the sole beneficiary.

3. The Restricted Stock Units fully vested on June 11, 2026. The above figure includes 331 additional Restricted Stock Units acquired from dividend equivalents. Restricted Stock Units accrue dividend equivalents, which are subject to the same terms and conditions as the underlying award and vest therewith.

4. Represents the annual non-discretionary grant of awards to the Issuer's Non-Executive Directors in accordance with the terms of the Luxfer Holdings PLC Non-Executive Directors Equity Incentive Plan. The Restricted Stock Units vest on the day immediately preceding the Issuer's 2027 Annual General Meeting of Shareholders.

	/s/ Benjamin M. Coulson under Power of Attorney for Lisa G Trimberger	06/15/2026
	** 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