BankUnited CFO has 8,937 RSUs vest, 3,517 withheld

Rhea-AI Filing Summary

BankUnited, Inc. (BKU) reported that Chief Financial Officer James G. Mackey had restricted share units vest and convert into common stock and related tax withholding transactions on August 20, 2026. 8,937 restricted share units converted into the same number of common shares, and 3,517 shares were withheld by the company at $46.83 per share to satisfy Mr. Mackey’s tax withholding obligation rather than being sold in the market. Following the vesting, Mr. Mackey held 26,731 restricted share units, with additional tranches of 8,936 units scheduled to vest on August 20, 2027 and 8,937 units on August 20, 2028 under the BankUnited, Inc. 2023 Omnibus Equity Incentive Plan. The transactions were not reported as being made pursuant to a Rule 10b5-1 trading plan.

Insider Trade Summary

Net Buyer: 5,420 shares

Net Buy 3 txns

Insider Mackey James G.

Role Chief Financial Officer

Type	Security	Shares	Price	Value
Exercise	Restricted Share Unit F2, F3	8,937	$0.00	$0.00
Exercise	Common Stock, par value $0.01	8,937	$0.00	$0.00
Tax Withholding	Common Stock, par value $0.01 F1	3,517	$46.83	$165K

Holdings After Transaction: Restricted Share Unit — 26,731 shares (Direct); Common Stock, par value $0.01 — 5,420 shares (Direct)

Footnotes (3)

1. F1. Shares of BankUnited, Inc. common stock withheld by the Issuer to satisfy the tax withholding obligation of the reporting person arising from the vesting of restricted shares on August 20, 2026. These shares were not sold by the reporting person but were instead withheld from the total number of vested shares received by the reporting person from the Issuer.
2. F2. Each restricted share unit represents the right to receive, at settlement, one share of common stock or cash in an amount equal to the fair market value of one share of common stock.
3. F3. Issued pursuant to the terms of the BankUnited, Inc. 2023 Omnibus Equity Incentive Plan. 8,937 units vested on August 20, 2026, 8,936 units will vest on August 20, 2027, and 8,937 will vest on August 20, 2028.

Key Figures

Restricted share units converted: 8,937 units Shares withheld for taxes: 3,517 shares Withholding share price: $46.83 per share +3 more

6 metrics

Restricted share units converted 8,937 units Units vested and converted into common stock on August 20, 2026

Shares withheld for taxes 3,517 shares Common shares withheld to satisfy tax withholding obligation on August 20, 2026

Withholding share price $46.83 per share Price used for tax-related share withholding

Restricted share units remaining 26,731 units Restricted share units reported as held after the vesting transaction

Future vesting 2027 8,936 units Restricted share units scheduled to vest on August 20, 2027

Future vesting 2028 8,937 units Restricted share units scheduled to vest on August 20, 2028

Key Terms

Restricted Share Unit, tax withholding obligation, 2023 Omnibus Equity Incentive Plan

3 terms

Restricted Share Unit financial

"security_title "Restricted Share Unit""

A restricted share unit (RSU) is a promise by a company to give an employee a set number of company shares at a future date, typically after meeting time or performance conditions. For investors, RSUs matter because when they convert into actual shares they increase the number of shares outstanding (like unlocking more tickets in a game), which can dilute existing holders, and they align employee incentives with company performance, influencing behavior and long-term value.

tax withholding obligation financial

"to satisfy the tax withholding obligation of the reporting person"

2023 Omnibus Equity Incentive Plan financial

"Issued pursuant to the terms of the BankUnited, Inc. 2023 Omnibus Equity Incentive Plan"

FAQ

What did BankUnited (BKU) disclose about CFO James G. Mackey’s Form 4 transactions?

CFO James G. Mackey had 8,937 restricted share units vest and convert into common stock on August 20, 2026, with 3,517 shares withheld by BankUnited to cover tax obligations related to the vesting.

How many BankUnited (BKU) shares were withheld for taxes in this Form 4?

BankUnited withheld 3,517 shares of common stock from CFO James G. Mackey at $46.83 per share to satisfy his tax withholding obligation arising from the August 20, 2026 vesting of restricted shares.

How many restricted share units of BKU vested and converted to common stock?

On August 20, 2026, 8,937 restricted share units of BankUnited vested for CFO James G. Mackey and converted into 8,937 shares of BankUnited common stock at a conversion price of $0.00 per share.

What restricted share unit balance does the BankUnited (BKU) CFO hold after these transactions?

After the August 20, 2026 vesting event, CFO James G. Mackey reported holding 26,731 restricted share units of BankUnited, Inc., as shown in the post-transaction derivative holdings line.

What future vesting schedule is disclosed for BankUnited (BKU) restricted share units?

Under the BankUnited, Inc. 2023 Omnibus Equity Incentive Plan, 8,936 units are scheduled to vest on August 20, 2027 and 8,937 units on August 20, 2028 for CFO James G. Mackey.

Were the BKU Form 4 transactions made under a Rule 10b5-1 trading plan?

No. The Rule 10b5-1 checkbox was not marked as applicable, so the reported transactions were not affirmed as being made pursuant to a Rule 10b5-1 trading plan.

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

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Available on EDGAR 08/21/2026 - 05:03 PM Accepted by SEC EDGAR 08/21/2026 - 05:03 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^*

Mackey James G.

(Last) (First) (Middle)

C/O BANKUNITED, INC.

14817 OAK LANE

(Street)

MIAMI LAKES FLORIDA 33016

(City) (State) (Zip)

UNITED STATES

(Country)

2. Issuer Name and Ticker or Trading Symbol
BankUnited, Inc. [ BKU ]

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

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

2a. Foreign Trading Symbol

3. Date of Earliest Transaction (Month/Day/Year)
08/20/2026

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
Common Stock, par value $0.01	08/20/2026		M		8,937	A	$0	8,937	D
Common Stock, par value $0.01	08/20/2026		F(1)		3,517	D	$46.83	5,420	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 Share Unit	(2)	08/20/2026		M			8,937	(3)	(3)	Common Stock, par value $0.01 per share	8,937	$0	26,731	D

Explanation of Responses:

1. Shares of BankUnited, Inc. common stock withheld by the Issuer to satisfy the tax withholding obligation of the reporting person arising from the vesting of restricted shares on August 20, 2026. These shares were not sold by the reporting person but were instead withheld from the total number of vested shares received by the reporting person from the Issuer.

2. Each restricted share unit represents the right to receive, at settlement, one share of common stock or cash in an amount equal to the fair market value of one share of common stock.

3. Issued pursuant to the terms of the BankUnited, Inc. 2023 Omnibus Equity Incentive Plan. 8,937 units vested on August 20, 2026, 8,936 units will vest on August 20, 2027, and 8,937 will vest on August 20, 2028.

	/s/ Jacqueline Bravo, as Attorney-in-Fact	08/21/2026
	** 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)