Name: CFSB Bancorp, Inc. /MA/ Insider Trading Activity
Creator: InsiderAct
License: https://www.sec.gov/about/privacy-information

Question 1

Who are the insiders buying CFSB Bancorp, Inc. /MA/ stock?

Accepted Answer

InsiderAct tracks all open-market purchases of CFSB Bancorp, Inc. /MA/ stock by corporate insiders — including officers, directors, and shareholders owning more than 10% — sourced from public SEC Form 4 filings.

Question 2

What does insider buying at a company mean?

Accepted Answer

When a corporate officer, director, or major shareholder purchases their own company's stock on the open market using personal funds, it signals confidence in the company's outlook. This is especially meaningful when multiple insiders buy within the same 7–14 day window (cluster buying) or when the purchase size exceeds $100,000.

Question 3

How do I find cluster buying signals for a company?

Accepted Answer

InsiderAct automatically detects cluster buying — two or more insiders independently purchasing shares within a 14-day window. When a cluster buy signal is active for a company, it appears prominently on the company's InsiderAct page and on the Signals tab.

Question 4

Has CFSB Bancorp, Inc. /MA/ had any recent large insider purchases?

Accepted Answer

InsiderAct tracks all open-market purchases of $100,000 or more at CFSB Bancorp, Inc. /MA/. Large insider purchases are flagged as high-conviction signals because they represent meaningful personal capital commitments by executives or directors who have direct visibility into the company's operations and prospects.

Question 5

Where do the insider transactions on this page come from?

Accepted Answer

All transactions shown on InsiderAct company pages are sourced directly from SEC EDGAR Form 4 filings — the mandatory public disclosures that corporate insiders must submit within 2 business days of any stock transaction. InsiderAct ingests these filings in near real time and filters for open-market purchases and sales.

								1WStock price change 1 week after insider bought. Small number below shows return vs S&P 500.	1MStock price change 1 month after insider bought.
2025-10-31	2025-10-31	Marini Stephen D	Director	Disposition	10,000	$0.00	$0	N/A	N/A
2025-10-31	2025-10-31	Esselystyn William R	VP	Disposition	11,940	$0.00	$0	N/A	N/A
2025-10-31	2025-10-31	Shea Susan	COO	Disposition	18,000	$0.00	$0	N/A	N/A
2025-10-31	2025-10-31	Esselystyn William R	VP	Disposition	350	$0.00	$0	N/A	N/A
2025-10-31	2025-10-31	Wilson Tracy L	Director	Disposition	100	$0.00	$0	N/A	N/A
2025-10-31	2025-10-31	Guarnieri Robert	Director	Disposition	2,500	$0.00	$0	N/A	N/A
2025-10-31	2025-10-31	Esselystyn William R	VP	Disposition	6,000	$0.00	$0	N/A	N/A
2025-10-31	2025-10-31	Blanchard Angela	VP	Disposition	6,000	$0.00	$0	N/A	N/A
2025-10-31	2025-10-31	Baharian Paul N	Director	Disposition	14,000	$0.00	$0	N/A	N/A
2025-10-31	2025-10-31	Keohane Edward J	Director	Disposition	14,000	$0.00	$0	N/A	N/A

CFSB

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