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Catalyst Bancorp director exercises 17,457 options

A Catalyst Bancorp director exercised 17,457 stock options into common shares and still holds additional options and indirect IRA and spousal share positions.

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Form Type
4

Rhea-AI Filing Summary

Catalyst Bancorp, Inc. (CLST) director Kleiser Kirk E. exercised stock options on September 16, 2026 to acquire 16,928 shares of common stock at an exercise price of $13.30 per share and 529 shares at $12.08 per share. After these exercises, he continues to hold stock options covering 2,645 underlying shares at an exercise price of $15.96 per share expiring June 10, 2036, as well as indirect holdings of 20,099, 4,100, and 900 common shares through his IRA and his spouse’s accounts. No Rule 10b5-1 trading plan is reported for these transactions.

Insider Kleiser Kirk E.
Role Director
Type Security Shares Price Value
Exercise Stock Option (Right to Buy) F5 16,928 $0.00 $0.00
Exercise Stock Option (Right to Buy) F1 529 $0.00 $0.00
Exercise Common Stock F1, F2, F3, F4 529 $12.08 $6K
Exercise Common Stock F5 16,928 $13.30 $225K
holding Stock Option (Right to Buy) F6 -- -- --
holding Common Stock -- -- --
holding Common Stock -- -- --
holding Common Stock -- -- --
Holdings After Transaction: Stock Option (Right to Buy) — 8,993 contracts for 2,645 underlying shares (Direct); Common Stock — 45,358 shares (Direct); Common Stock — 20,099 shares (Indirect, By IRA); Common Stock — 4,100 shares (Indirect, By Spouse in IRA); Common Stock — 900 shares (Indirect, By Spouse)
Footnotes (6)
  1. F1. The options are vesting at a rate of 20% per year commenced on June 10, 2026. As of the date of this filing 529 options were exercised.
  2. F2. Includes 1,058 shares granted pursuant to the Issuer's 2022 Recognition and Retention Plan and Trust Agreement that vest at 20% per year commencing on June 10, 2027.
  3. F3. Includes 847 shares granted pursuant to the Issuer's 2022 Recognition and Retention Plan and Trust Agreement that reflect the unvested portion of a grant amount originally covering 1,058 shares that commenced vesting 20% per year on June 10, 2026.
  4. F4. Includes 1,696 shares granted pursuant to the Issuer's 2022 Recognition and Retention Plan and Trust Agreement that reflect the unvested portion of a grant amount originally covering 8,464 shares that commenced vesting 20% per year on September 1, 2023.
  5. F5. The options are vesting at a rate of 20% per year commenced on September 1, 2023. As of the date of this filing 16,928 options were exercised.
  6. F6. The options vest at a rate of 20% per year commencing on June 10, 2027.
Options exercised at $13.30 16,928 shares Stock options exercised into common stock on September 16, 2026 at $13.30 per share
Options exercised at $12.08 529 shares Stock options exercised into common stock on September 16, 2026 at $12.08 per share
Total options exercised 17,457 options Total derivative securities converted to common stock on September 16, 2026
Remaining options exercise price $15.96 per share Exercise price of remaining stock options expiring June 10, 2036
Remaining options underlying shares 2,645 shares Underlying common shares for unexercised stock options held directly
Indirect IRA holdings 20,099 shares Common stock held indirectly by the director through an IRA after the transactions
Spouse IRA holdings 4,100 shares Common stock held indirectly through spouse’s IRA after the transactions
Spouse holdings (non-IRA) 900 shares Common stock held indirectly by the director through spouse after the transactions
Stock Option (Right to Buy) financial
"Stock Option (Right to Buy) with underlying Common Stock and stated exercise price"
Recognition and Retention Plan and Trust Agreement financial
"Includes 1,058 shares granted pursuant to the Issuer's 2022 Recognition and Retention Plan and Trust Agreement"
vesting at a rate of 20% per year financial
"The options are vesting at a rate of 20% per year commenced on June 10, 2026"
IRA financial
"Common Stock held indirectly by IRA and by Spouse in IRA"
An individual retirement account (IRA) is a savings account designed to help people put aside money for their retirement, often with tax advantages that encourage long-term savings. It matters to investors because it can grow over time, providing financial security later in life, and offers benefits that can reduce current taxes or allow investments to compound more effectively.

FAQ

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What did the Catalyst Bancorp (CLST) director report in this Form 4?

The director reported exercising stock options on September 16, 2026 to acquire 16,928 shares of common stock at $13.30 per share and 529 shares at $12.08 per share, converting a total of 17,457 options into common shares.

At what prices were the Catalyst Bancorp (CLST) options exercised?

On September 16, 2026 the director exercised options for 16,928 shares of Catalyst Bancorp common stock at an exercise price of $13.30 per share and options for 529 shares at an exercise price of $12.08 per share.

How many Catalyst Bancorp (CLST) options does the director still hold after these exercises?

After the reported exercises, the director continues to hold stock options covering 2,645 underlying shares of Catalyst Bancorp common stock with an exercise price of $15.96 per share, vesting 20% per year and expiring on June 10, 2036.

What indirect Catalyst Bancorp (CLST) share holdings does the director report?

The director reports indirect ownership of Catalyst Bancorp common stock consisting of 20,099 shares held by an IRA, 4,100 shares held by a spouse in an IRA, and 900 shares held by a spouse outside an IRA.

Were the Catalyst Bancorp (CLST) option exercises made under a Rule 10b5-1 plan?

No. The filing indicates that these option exercises were not made pursuant to a Rule 10b5-1 trading plan; the document-level checkbox affirming a Rule 10b5-1 arrangement is not marked.

How many total Catalyst Bancorp (CLST) options were exercised in this Form 4?

The director exercised a total of 17,457 stock options for Catalyst Bancorp common stock on September 16, 2026, consisting of 16,928 options at a $13.30 exercise price and 529 options at a $12.08 exercise price.

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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
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*
Kleiser Kirk E.

(Last)(First)(Middle)
C/O CATALYST BANCORP INC
235 N COURT ST

(Street)
OPELOUSAS LOUISIANA 70570

(City)(State)(Zip)

UNITED STATES

(Country)
2. Issuer Name and Ticker or Trading Symbol
Catalyst Bancorp, Inc. [ CLST ]
5. Relationship of Reporting Person(s) to Issuer
(Check all applicable)
XDirector10% Owner
Officer (give title below)Other (specify below)
2a. Foreign Trading Symbol
3. Date of Earliest Transaction (Month/Day/Year)
09/16/2026
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 Stock09/16/2026M(1)529A$12.0845,887(2)(3)(4)D
Common Stock09/16/2026M(5)16,928A$13.345,358D
Common Stock20,099IBy IRA
Common Stock4,100IBy Spouse in IRA
Common Stock900IBy Spouse
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
Stock Option (Right to Buy)$13.309/16/2026M16,928 (5)09/01/2032Common Stock16,928$04,232D
Stock Option (Right to Buy)$12.0809/16/2026M529 (1)06/10/2035Common Stock529$02,116D
Stock Option (Right to Buy)$15.96 (6)06/10/2036Common Stock2,6452,645D
Explanation of Responses:
1. The options are vesting at a rate of 20% per year commenced on June 10, 2026. As of the date of this filing 529 options were exercised.
2. Includes 1,058 shares granted pursuant to the Issuer's 2022 Recognition and Retention Plan and Trust Agreement that vest at 20% per year commencing on June 10, 2027.
3. Includes 847 shares granted pursuant to the Issuer's 2022 Recognition and Retention Plan and Trust Agreement that reflect the unvested portion of a grant amount originally covering 1,058 shares that commenced vesting 20% per year on June 10, 2026.
4. Includes 1,696 shares granted pursuant to the Issuer's 2022 Recognition and Retention Plan and Trust Agreement that reflect the unvested portion of a grant amount originally covering 8,464 shares that commenced vesting 20% per year on September 1, 2023.
5. The options are vesting at a rate of 20% per year commenced on September 1, 2023. As of the date of this filing 16,928 options were exercised.
6. The options vest at a rate of 20% per year commencing on June 10, 2027.
/s/ Jutta Codori by P.O.A. for Kirk E. Kleiser09/18/2026
** 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)

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