Gibraltar VP withholds 2,601 shares for taxes

Gibraltar Industries general counsel Katherine Bolanowski reported a tax-related share disposition.

Rhea-AI Filing Summary

Gibraltar Industries general counsel Katherine Bolanowski reported a tax-related share disposition. On March 4, 2026, 2,601 shares of common stock were withheld at $43.05 per share to cover tax obligations from vesting performance stock units, leaving 15,989 shares of common stock directly owned. She also holds 6,343.09 matching restricted stock units under the 2018 Management Stock Purchase Plan, which may be forfeited if her officer service ends before the fifth anniversary of her vesting start date and are ultimately settled in cash after service ends.

Insider Trade Summary

Exercise Price or Tax Liability: 2,601 shares

Exercise Price or Tax Liability 2 txns

Insider Bolanowski Katherine

Role General Counsel, VP, Secretary

Type	Security	Shares	Price	Value
Exercise Price or Tax Liability	Common Stock	2,601	$43.05	$112K
holding	Restricted Stock Unit (2018 MSPP Match)	--	--	--

Holdings After Transaction: Common Stock — 15,989 shares (Direct); Restricted Stock Unit (2018 MSPP Match) — 6,343.09 contracts (Direct)

Footnotes (3)

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.

FAQ

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

What insider transaction did ROCK executive Katherine Bolanowski report?

Katherine Bolanowski reported shares withheld for taxes, not an open-market sale. On March 4, 2026, 2,601 Gibraltar Industries common shares were used to satisfy tax obligations from vesting performance stock units, a routine administrative transaction rather than a discretionary trade.

How many Gibraltar Industries shares does Katherine Bolanowski hold after this Form 4?

After the tax-withholding transaction, Katherine Bolanowski directly holds 15,989 Gibraltar Industries common shares. This figure reflects her position following the 2,601 shares withheld to satisfy tax obligations tied to her vesting performance stock units on March 4, 2026.

What price was used for the ROCK shares withheld for taxes?

The shares withheld for taxes were valued at $43.05 per share. This price applied to the 2,601 Gibraltar Industries common shares used to cover Katherine Bolanowski’s tax withholding obligation related to the vesting of her performance stock units on March 1, 2026.

Are the reported ROCK share dispositions an open-market sale?

No, the disposition reflects tax withholding, not an open-market sale. Shares were withheld by Gibraltar Industries to cover Katherine Bolanowski’s tax obligation from vesting performance stock units, consistent with the Form 4 code F description for payment of tax liability using securities.

What restricted stock units does Katherine Bolanowski hold under ROCK’s 2018 plan?

She holds 6,343.09 matching restricted stock units under the 2018 Management Stock Purchase Plan. These units relate to deferrals of salary and cash incentives and are forfeited if her officer service ends before the fifth anniversary of her vesting commencement date.

How are ROCK restricted stock units under the 2018 plan ultimately paid?

The restricted stock units are ultimately payable solely in cash, not shares. After Katherine Bolanowski’s officer service ends beyond the five-year vesting mark, they are converted to a cash amount equal to the fair market value of one common share per unit on the termination date.

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

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Accepted by SEC EDGAR 03/05/2026 - 01:42 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^*

Bolanowski Katherine

(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)

	Director		10% Owner
X	Officer (give title below)		Other (specify below)
	General Counsel, VP, Secretary

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		2,601(1)	D	$43.05	15,989	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	6,343.09		6,343.09	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.

	/s/ Jeffrey J. Watorek, Attorney-in-Fact for Katherine E. Bolanowski	03/05/2026
	** 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.