Latest filingSep 18, 2026Most recent Form 4
CLST
Catalyst Bancorp, Inc.
NasdaqFinancialsSavings Institution, Federally Chartered
Insider activity for last month from 08/19 to 09/19. Counts use processed Form 4 rows. Purchase and sale metrics use codes P and S; totals remain unknown when any matching value is missing. Rows without a usable transaction date cannot be assigned to a rolling period and are excluded.
Total buying$00 buys
Total selling$00 sells
Net open-market+$03 insiders
Open-market mix
Buy vs sell distribution by transaction countInsider activity report
Monthly open-market purchase and sale counts Buys Sells
Transaction codes
By Form 4 transaction code in selected period6transactions
- M · Option exercise · dominant4 · 67%
- F · Tax withholding2 · 33%
Activity by reported role
A joint filing can contribute to multiple roles6transactions
- Director · dominant4 · 67%
- Chief financial officer1 · 17%
- PRES1 · 17%
Distinct insiders active
Reporting-owner CIKs by month · peak Sep 2026 (3)Aug 2026Sep 2026
Reported Holdings After
Separated by insider, security, and ownership typeKleiser Kirk E.Stock Option (Right to Buy) · Direct
4,232Sep 16, 2026
Kleiser Kirk E.Common Stock · Direct
45,887Sep 16, 2026
Bourque Jacques L.J.Common Stock · Direct
4,335Sep 01, 2026
Zanco Joseph BCommon Stock · Direct
37,002Sep 01, 2026
These are reported post-transaction holdings, not company-wide ownership percentages. Securities, indirect vehicles, and amendments are kept separate.
Filing activity heatmap
Each cell is one day · intensity = transactions · buys green, sells redAug 19 → Sep 19
LessMore
Top insiders
By absolute net value across the selected period- KE+$231.5k
- ZB-$20.6k
- BL-$2.3k
Filing detail checks
Secondary metrics for the selected periodFiling-only signals
Deterministic matches in the selected period
No filing-only signal badges matched this period.
CLST transaction history
Filters apply within this company and selected period by defaultLatest insider transactions
Form 4 filings from last month. Click any column to sort; click it again to flip the order.
| ID | Ticker | Insider | Role | Type | Shares | Value | Code | Filed | Trans date |
|---|---|---|---|---|---|---|---|---|---|
| #225784 | CLST | Kleiser Kirk E. | DIR | exercise | 529 | $0 | M | 09/18 | 09/16 |
| #225783 | CLST | Kleiser Kirk E. | DIR | exercise | 16.9k | $0 | M | 09/18 | 09/16 |
| #225782 | CLST | Kleiser Kirk E. | DIR | exercise | 16.9k | $22.5M | M | 09/18 | 09/16 |
| #225781 | CLST | Kleiser Kirk E. | DIR | exercise | 529 | $639k | M | 09/18 | 09/16 |
| #201969 | CLST | Zanco Joseph B | PRES | withholding | 1.15k | -$2.06M | F | 09/02 | 09/01 |
| #201734 | CLST | Bourque Jacques L.J. | CFO | withholding | 131 | -$233k | F | 09/02 | 09/01 |
Catalyst Bancorp, Inc. Insider Activity FAQ
SEC Form 4 contextWho recently reported transactions at Catalyst Bancorp, Inc.?
Kleiser Kirk E., Zanco Joseph B, Bourque Jacques L.J..
When was the latest reported open-market purchase?
No code-P purchase is available for this period.
When was the latest reported open-market sale?
No code-S sale is available for this period.
What is the recent purchase and sale balance?
No code-P purchases or code-S sales were reported in the selected period.
Where can I see the original SEC filing?
Every transaction row and latest-activity fact links to its original SEC filing.
What do these Form 4 transaction codes mean?
P and S generally describe open-market or private purchases and sales. A, D, F, M, X, G, J, and V describe awards, issuer dispositions, tax withholding, exercises, gifts, other transactions, and voluntary early reports; review each filing and its footnotes for context.