Question 1

Who are the insiders buying Y-mAbs Therapeutics, Inc. stock?

Accepted Answer

InsiderAct tracks all open-market purchases of Y-mAbs Therapeutics, Inc. 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 Y-mAbs Therapeutics, Inc. had any recent large insider purchases?

Accepted Answer

InsiderAct tracks all open-market purchases of $100,000 or more at Y-mAbs Therapeutics, Inc.. 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.
2025-09-19	2025-09-16	Hamill Laura	Director	Disposition	14,545	$0.00	$0	N/A	N/A
2025-09-18	2025-09-16	Wilms Joris	COO	Disposition	20,000	$0.00	$0	N/A	N/A
2025-09-18	2025-09-16	Gill David N	Director	Disposition	25,080	$0.00	$0	N/A	N/A
2025-09-18	2025-09-16	Gentilcore Douglas J	SVP	Disposition	142,600	$0.00	$0	N/A	N/A
2025-09-18	2025-09-16	Gill David N	Director	Disposition	16,000	$0.00	$0	N/A	N/A
2025-09-18	2025-09-16	Healy James	Director	Disposition	25,080	$0.00	$0	N/A	N/A
2025-09-18	2025-09-16	Pfreundschuh Peter P.	CFO	Disposition	77,800	$0.00	$0	N/A	N/A
2025-09-18	2025-09-16	Gill David N	Director	Disposition	11,000	$0.00	$0	N/A	N/A
2025-09-18	2025-09-16	Healy James	Director	Tender Special	31,603	$8.60	-$271,786	N/A	N/A
2025-09-18	2025-09-16	Gad Thomas	CBO	Disposition	75,000	$0.00	$0	N/A	N/A

YMAB

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