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Stellar Bancorp (STEL) officer’s 65,535 shares canceled, converted in merger

Filing Impact
(Neutral)
Filing Sentiment
(Neutral)
Form Type
4

Rhea-AI Filing Summary

Stellar Bancorp, Inc. Chief Banking Officer Jason D. Sirkel reported a disposition to the issuer of 65,535 shares of common stock at a stated price of $0.00 per share, leaving him with no Stellar common shares after the transaction.

This disposition occurred at the closing of the merger with Prosperity Bancshares, Inc., when each Stellar share was cancelled and converted into the right to receive 0.3803 shares of Prosperity common stock plus $11.36 in cash per share. The total included 55,280 common shares, 7,927 restricted shares that vested at closing, and 2,328 performance unit awards that became payable in cash based on the merger consideration.

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Insider Sirkel Jason D.
Role Chief Banking Officer
Type Security Shares Price Value
Disposition Common Stock 65,535 $0.00 --
Holdings After Transaction: Common Stock — 0 shares (Direct, null)
Footnotes (1)
  1. Includes 55,280 shares of Company Common Stock (as defined below). On July 1, 2026 (the "Effective Time"), upon consummation of the transactions contemplated by the Agreement and Plan of Merger (the "Merger Agreement"), dated as of January 27, 2026, by and between Prosperity Bancshares, Inc., a Texas corporation ("Prosperity"), and Stellar Bancorp, Inc., a Texas corporation (the "Company"), and subject to the terms and conditions set forth in the Merger Agreement, each share of the Company's common stock, par value $0.01 per share ("Company Common Stock"), outstanding immediately prior to the Effective Time was cancelled and converted into the right to receive (i) 0.3803 shares of common stock (the "Exchange Ratio"), par value $1.00 per share, of Prosperity ("Prosperity Common Stock") and (ii) an amount in cash equal to $11.36 (the "Per Share Cash Merger Consideration") ((i) and (ii) together, the "Per Share Merger Consideration"). Includes 7,927 shares of restricted stock. At the Effective Time, each outstanding restricted stock award in respect of Company Common Stock subject solely to service-based vesting, repurchase or other lapse restriction vested and was converted into the right to receive (without interest) the Per Share Merger Consideration. Includes 2,328 performance unit awards granted (as defined below) in 2026. At the Effective Time, each outstanding restricted unit award in respect of Company Common Stock subject to performance-based vesting (each, a "performance unit award") fully vested and was converted into the right to receive (without interest) a cash payment equal to the product of (a) the Per Share Merger Consideration Value multiplied by (b) the number of shares of Company Common Stock subject to such performance unit award, with applicable performance-based vesting conditions deemed achieved at 100% of the target level.
Shares disposed 65,535 shares Disposition to issuer at merger effective time
Price per share $0.00 per share Reported disposition price
Post-transaction holdings 0 shares Common stock held after disposition
Exchange ratio 0.3803 shares Prosperity common stock per Stellar share
Cash merger consideration $11.36 per share Cash portion of Per Share Merger Consideration
Common shares included 55,280 shares Company common stock included in total
Restricted shares included 7,927 shares Restricted stock vesting at effective time
Performance unit awards 2,328 units Performance-based awards vesting and paid in cash
Per Share Merger Consideration financial
"((i) and (ii) together, the "Per Share Merger Consideration")."
Exchange Ratio financial
"to receive (i) 0.3803 shares of common stock (the "Exchange Ratio"),"
The exchange ratio is the number used to decide how many shares of one company you get for each share you own in another company during a merger or acquisition. It’s like a recipe that tells you how to swap shares fairly, ensuring both companies’ values are balanced. This ratio matters because it determines how ownership divides between the companies' shareholders.
restricted stock award financial
"each outstanding restricted stock award in respect of Company Common Stock"
A restricted stock award is company shares given to an employee or executive that cannot be sold or fully owned until certain conditions—like staying with the company for a set time or hitting performance targets—are met. Think of it as a gift that only becomes yours after you fulfill specific obligations; for investors, these awards matter because they can increase the total shares outstanding when they vest, reveal how management is being paid and motivated, and create potential selling pressure when restrictions lift.
performance unit award financial
"each, a "performance unit award") fully vested and was converted"
Per Share Cash Merger Consideration financial
"and (ii) an amount in cash equal to $11.36 (the "Per Share Cash Merger Consideration")"
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Learn about SEC filing dates
SEC Form 4
FORM 4UNITED 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
X
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*
Sirkel Jason D.

(Last)(First)(Middle)
9 GREENWAY PLAZA, SUITE 110

(Street)
HOUSTON TEXAS 77046

(City)(State)(Zip)

UNITED STATES

(Country)
2. Issuer Name and Ticker or Trading Symbol
Stellar Bancorp, Inc. [ STEL ]
5. Relationship of Reporting Person(s) to Issuer
(Check all applicable)
Director10% Owner
XOfficer (give title below)Other (specify below)
Chief Banking Officer
2a. Foreign Trading Symbol
3. Date of Earliest Transaction (Month/Day/Year)
07/01/2026
6. Individual or Joint/Group Filing (Check Applicable Line)
XForm 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)
CodeVAmount(A) or (D)Price
Common Stock07/01/2026D65,535D$0(1)(2)(3)$0D
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)
CodeV(A)(D)Date ExercisableExpiration DateTitleAmount or Number of Shares
Explanation of Responses:
1. Includes 55,280 shares of Company Common Stock (as defined below). On July 1, 2026 (the "Effective Time"), upon consummation of the transactions contemplated by the Agreement and Plan of Merger (the "Merger Agreement"), dated as of January 27, 2026, by and between Prosperity Bancshares, Inc., a Texas corporation ("Prosperity"), and Stellar Bancorp, Inc., a Texas corporation (the "Company"), and subject to the terms and conditions set forth in the Merger Agreement, each share of the Company's common stock, par value $0.01 per share ("Company Common Stock"), outstanding immediately prior to the Effective Time was cancelled and converted into the right to receive (i) 0.3803 shares of common stock (the "Exchange Ratio"), par value $1.00 per share, of Prosperity ("Prosperity Common Stock") and (ii) an amount in cash equal to $11.36 (the "Per Share Cash Merger Consideration") ((i) and (ii) together, the "Per Share Merger Consideration").
2. Includes 7,927 shares of restricted stock. At the Effective Time, each outstanding restricted stock award in respect of Company Common Stock subject solely to service-based vesting, repurchase or other lapse restriction vested and was converted into the right to receive (without interest) the Per Share Merger Consideration.
3. Includes 2,328 performance unit awards granted (as defined below) in 2026. At the Effective Time, each outstanding restricted unit award in respect of Company Common Stock subject to performance-based vesting (each, a "performance unit award") fully vested and was converted into the right to receive (without interest) a cash payment equal to the product of (a) the Per Share Merger Consideration Value multiplied by (b) the number of shares of Company Common Stock subject to such performance unit award, with applicable performance-based vesting conditions deemed achieved at 100% of the target level.
/s/ Justin M. Long, attorney-in-fact07/01/2026
** Signature of Reporting PersonDate
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)

FAQ

What insider transaction did Stellar Bancorp (STEL) report for Jason D. Sirkel?

Jason D. Sirkel reported a disposition to the issuer of 65,535 shares of Stellar Bancorp common stock at a stated price of $0.00 per share. After this merger-related cancellation, he held no remaining Stellar common shares.

How many Stellar Bancorp (STEL) shares did Jason D. Sirkel hold after the merger?

After the merger-related disposition, Jason D. Sirkel held 0 shares of Stellar Bancorp common stock. All 65,535 reported shares were cancelled and converted into merger consideration tied to Prosperity Bancshares stock and cash.

What merger consideration did Stellar Bancorp (STEL) shareholders receive per share?

Each share of Stellar Bancorp common stock was converted into 0.3803 shares of Prosperity common stock plus $11.36 in cash per share. This combined stock-and-cash package is referred to as the Per Share Merger Consideration in the transaction documents.

How were Jason D. Sirkel’s restricted Stellar Bancorp (STEL) shares treated in the merger?

Sirkel’s 7,927 restricted Stellar Bancorp shares vested at the merger’s effective time and were converted into the same Per Share Merger Consideration. These vested restricted shares were included within the 65,535 total shares reported as disposed to the issuer.

What happened to Jason D. Sirkel’s Stellar Bancorp (STEL) performance unit awards?

Sirkel held 2,328 performance unit awards that fully vested at the effective time. Each unit was converted into a cash payment equal to the Per Share Merger Consideration value multiplied by the underlying share count, with performance deemed achieved at 100% of target.