Southside Bancshares (SBSI) director Gibson gets PSU stock award with tax withholding

Rhea-AI Filing Summary

Southside Bancshares director Lee R. Gibson received a stock award and related tax withholding in company shares. On March 17, 2026, he acquired 4,082 shares of Common Stock as a grant or award, reflecting settlement of performance-based restricted stock units earned under ROATCE goals and continued employment conditions. To cover tax obligations, 993 shares were withheld at $29.94 per share, leaving him with 57,473 directly held shares afterward. He also holds 8,665 shares indirectly through a 401k SSB Trust and 31,904 shares indirectly through an ESOP, showing a substantial ongoing equity position tied to the company’s performance.

Insights

Equity compensation analyst

Routine performance-based stock award with tax withholding; no open-market trading.

Lee R. Gibson, a director of Southside Bancshares, received 4,082 shares of Common Stock as a performance-based stock award tied to ROATCE and ongoing employment. This represents compensation, not an open-market purchase.

To satisfy tax obligations, 993 shares were withheld at $29.94 per share, a standard mechanism that does not signal discretionary selling. After these entries, Gibson directly holds 57,473 shares, plus additional indirect holdings via a 401k SSB Trust and an ESOP.

The transactions indicate continued alignment of Gibson’s compensation with shareholder outcomes through performance-based equity. They do not change cash position or involve open-market buys or sells, so their informational value for short-term stock expectations is limited.

Insider Trade Summary

4 transactions reported

Mixed 4 txns

Insider GIBSON LEE R

Role Director

Type	Security	Shares	Price	Value
Grant/Award	Common Stock	4,082	$0.00	--
Tax Withholding	Common Stock	993	$29.94	$30K
holding	Common Stock	--	--	--
holding	Common Stock	--	--	--

Holdings After Transaction: Common Stock — 58,466 shares (Direct); Common Stock — 31,904 shares (Indirect, by ESOP)

Footnotes (1)

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Form 4 Insider Transactions: What Each Field Means →

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^*

GIBSON LEE R

(Last) (First) (Middle)

1201 S BECKHAM AVE

(Street)

TYLER TEXAS 75701

(City) (State) (Zip)

UNITED STATES

(Country)

2. Issuer Name and Ticker or Trading Symbol
SOUTHSIDE BANCSHARES INC [ SBSI ]

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)
03/17/2026

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	03/17/2026		A		4,082(1)	A	$0	58,466	D
Common Stock	03/17/2026		F		993	D	$29.94	57,473	D
Common Stock								31,904	I	by ESOP
Common Stock								8,665	I	401k SSB Trust

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

Explanation of Responses:

1. Reflects the settlement of performance-based restricted stock units ("PSUs") granted to the reporting person on February 2, 2023, such PSUs were earned based on achievement of goals related to ROATCE and the reporting person's continued employment with the Company.

Remarks:

	Lindsey Bibby Bailes, attorney in fact	03/18/2026
	** 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)

FAQ

What did Southside Bancshares (SBSI) director Lee R. Gibson report in this Form 4?

He reported a performance-based stock award of 4,082 Common Stock shares and related tax withholding of 993 shares. These transactions reflect equity compensation and tax settlement, not open-market trading, and leave him with a sizeable continuing ownership stake in Southside Bancshares.

How many Southside Bancshares (SBSI) shares did Lee R. Gibson acquire in this filing?

He acquired 4,082 shares of Common Stock as a grant or award with a per-share transaction price of $0.00. The award reflects settlement of previously granted PSUs earned based on ROATCE performance goals and his continued employment with the company over the vesting period.

Why were 993 Southside Bancshares (SBSI) shares withheld from Lee R. Gibson?

993 shares were disposed of through tax withholding at $29.94 per share to cover exercise price or tax liability. This is a non-market, administrative transaction and does not represent an open-market sale decision by Gibson or a change in his investment outlook.

What are Lee R. Gibson’s Southside Bancshares (SBSI) holdings after these transactions?

Following the reported entries, he directly holds 57,473 Common Stock shares. He also has 8,665 shares held indirectly through a 401k SSB Trust and 31,904 shares held indirectly through an ESOP, indicating meaningful exposure to Southside Bancshares’ long-term performance.

What do the performance-based RSUs in the Southside Bancshares (SBSI) Form 4 represent?

The award reflects settlement of performance-based restricted stock units granted on February 2, 2023. These PSUs were earned based on achievement of return on average tangible common equity (ROATCE) goals and Gibson’s continued employment, aligning his compensation with the bank’s profitability and shareholder returns.

Does this Southside Bancshares (SBSI) Form 4 show any open-market stock sales or purchases?

No, it shows a grant of 4,082 shares as equity compensation and 993 shares withheld for tax obligations. There are no open-market purchase or sale transactions, so the filing mainly documents compensation-related adjustments to Gibson’s equity position rather than discretionary trading activity.