ROCK CEO reports tax-withholding share disposition

Gibraltar Industries President and CEO William T. Bosway reported a tax-related share disposition tied to equity vesting.

Rhea-AI Filing Summary

Gibraltar Industries President and CEO William T. Bosway reported a tax-related share disposition tied to equity vesting. On March 4, 2026, 30,026 shares of common stock were withheld at $43.05 per share to cover tax obligations from the vesting of his performance stock units, leaving him with 223,585 common shares held directly. He also holds 2018 Management Stock Purchase Plan matching restricted stock units and deferral-based restricted stock units, with 43,981.51 and 69,271.42 units respectively, which are designed to be settled in cash after his service as an officer ends under the plan’s distribution rules.

Insider Trade Summary

Exercise Price or Tax Liability: 30,026 shares

Exercise Price or Tax Liability 3 txns

Insider Bosway William T

Role President and CEO

Type	Security	Shares	Price	Value
Exercise Price or Tax Liability	Common Stock	30,026	$43.05	$1.29M
holding	Restricted Stock Unit (2018 MSPP Match)	--	--	--
holding	Restricted Stock Unit (2018 MSPP)	--	--	--

Holdings After Transaction: Common Stock — 223,585 shares (Direct); Restricted Stock Unit (2018 MSPP Match) — 43,981.51 contracts (Direct); Restricted Stock Unit (2018 MSPP) — 69,271.42 contracts (Direct)

Footnotes (5)

1. F1. Represents shares withheld to cover the tax withholding obligation related to the vesting on March 1, 2026 of the Reporting Person's Performance Stock Units.
2. F2. Represents matching restricted stock units allocated to the Reporting Person with respect to the Reporting Person's deferral of a portion of their annual base salary and annual cash incentive compensation pursuant to the Company's 2018 Management Stock Purchase Plan.
3. F3. Restricted stock units are forfeited if Reporting Person's service as an officer of the Company is terminated prior to the fifth (5th) anniversary of the Reporting Person's vesting commencement date. If service as an officer continues beyond the fifth (5th) anniversary of the Reporting Person's vesting commencement date, restricted stock units are payable solely in cash in one lump sum payment or in five (5) or ten (10) consecutive, substantially equal annual installments, whichever distribution form is elected by the Reporting Person, beginning six (6) months following termination of service. Each restricted stock unit is converted to cash in an amount equal to the fair market value of one share of the Company's common stock, as defined in the Company's 2018 Management Stock Purchase Plan, on the date of termination of the Reporting Person's service as an officer of the Company.
4. F4. Represents restricted stock units allocated to the Reporting Person with respect to the Reporting Person's deferral of a portion of their annual base salary and annual cash incentive compensation pursuant to the Company's 2018 Management Stock Purchase Plan.
5. F5. Restricted stock units are payable solely in cash in one lump sum payment or in five (5) or ten (10) consecutive, substantially equal annual installments, whichever distribution form is elected by the Reporting Person, beginning six (6) months following termination of service. Each restricted stock unit is converted to cash in an amount equal to the fair market value of one share of the Company's common stock, as defined in the Company's 2018 Management Stock Purchase Plan, on the date of termination of the Reporting Person's service as an officer of the Company.

FAQ

AI-generated questions and answers. How Rhea-AI works. Not financial advice.

What insider transaction did ROCK CEO William Bosway report on March 4, 2026?

William T. Bosway reported a tax-withholding disposition on March 4, 2026. 30,026 common shares of Gibraltar Industries were withheld at $43.05 per share to satisfy tax obligations from vested performance stock units.

How many Gibraltar Industries (ROCK) shares does the CEO hold after this Form 4?

After the tax-withholding transaction, CEO William T. Bosway directly holds 223,585 shares of common stock. This figure reflects his position following the withholding of 30,026 shares to cover taxes on vested performance stock units.

Was the ROCK CEO’s March 2026 Form 4 an open-market stock sale?

No, the March 2026 Form 4 shows a tax-withholding disposition, not an open-market sale. 30,026 shares were withheld by the company at $43.05 per share to pay taxes on equity vesting.

What are the 2018 MSPP matching restricted stock units reported by ROCK’s CEO?

The 2018 MSPP matching restricted stock units represent units allocated when the CEO deferred portions of salary and cash incentives. He holds 43,981.51 units, which are ultimately payable in cash based on Gibraltar Industries’ common stock value after his officer service ends.

How are Gibraltar Industries (ROCK) restricted stock units under the 2018 plan settled?

Restricted stock units under the 2018 Management Stock Purchase Plan are payable solely in cash. After the CEO’s service ends, they convert to cash equal to the fair market value of one common share per unit, paid in a lump sum or installments.

What happens to ROCK restricted stock units if the CEO leaves before the five-year vesting period?

If the CEO’s officer service ends before the fifth anniversary of his vesting commencement date, certain restricted stock units are forfeited. Continued service beyond that point preserves the units for later cash settlement after termination.

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

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Accepted by SEC EDGAR 03/05/2026 - 01:35 PM Learn about SEC filing dates

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^*

Bosway William T

(Last) (First) (Middle)

3556 LAKE SHORE ROAD

P.O. BOX 2028

(Street)

BUFFALO NY 14219-0228

(City) (State) (Zip)

2. Issuer Name and Ticker or Trading Symbol
GIBRALTAR INDUSTRIES, INC. [ ROCK ]

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)
03/04/2026

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
Common Stock	03/04/2026		F		30,026(1)	D	$43.05	223,585	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
Restricted Stock Unit (2018 MSPP Match)(2)	(3)							(3)	(3)	Common Stock	43,981.51		43,981.51	D
Restricted Stock Unit (2018 MSPP)(4)	(5)							(5)	(5)	Common Stock	69,271.42		69,271.42	D

Explanation of Responses:

1. Represents shares withheld to cover the tax withholding obligation related to the vesting on March 1, 2026 of the Reporting Person's Performance Stock Units.

2. Represents matching restricted stock units allocated to the Reporting Person with respect to the Reporting Person's deferral of a portion of their annual base salary and annual cash incentive compensation pursuant to the Company's 2018 Management Stock Purchase Plan.

3. Restricted stock units are forfeited if Reporting Person's service as an officer of the Company is terminated prior to the fifth (5th) anniversary of the Reporting Person's vesting commencement date. If service as an officer continues beyond the fifth (5th) anniversary of the Reporting Person's vesting commencement date, restricted stock units are payable solely in cash in one lump sum payment or in five (5) or ten (10) consecutive, substantially equal annual installments, whichever distribution form is elected by the Reporting Person, beginning six (6) months following termination of service. Each restricted stock unit is converted to cash in an amount equal to the fair market value of one share of the Company's common stock, as defined in the Company's 2018 Management Stock Purchase Plan, on the date of termination of the Reporting Person's service as an officer of the Company.

4. Represents restricted stock units allocated to the Reporting Person with respect to the Reporting Person's deferral of a portion of their annual base salary and annual cash incentive compensation pursuant to the Company's 2018 Management Stock Purchase Plan.

5. Restricted stock units are payable solely in cash in one lump sum payment or in five (5) or ten (10) consecutive, substantially equal annual installments, whichever distribution form is elected by the Reporting Person, beginning six (6) months following termination of service. Each restricted stock unit is converted to cash in an amount equal to the fair market value of one share of the Company's common stock, as defined in the Company's 2018 Management Stock Purchase Plan, on the date of termination of the Reporting Person's service as an officer of the Company.

	/s/ Jeffrey J. Watorek, Attorney-in-Fact for William T. Bosway	03/05/2026
	** Signature of Reporting Person	Date
Reminder: Report on a separate line for each class of securities beneficially owned directly or indirectly.
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** Intentional misstatements or omissions of facts constitute Federal Criminal Violations See 18 U.S.C. 1001 and 15 U.S.C. 78ff(a).
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