Question 1

Who are the insiders buying CytomX Therapeutics, Inc. stock?

Accepted Answer

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

Accepted Answer

InsiderAct tracks all open-market purchases of $100,000 or more at CytomX 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.


2026-03-19	2026-03-17	Chu Yu-Waye	CMO	Sale	21,279	$6.42	$136,675
2026-03-19	2026-03-17	Mccarthy Sean A.	CEO	Sale	118,969	$6.42	$764,138
2026-03-19	2026-03-17	Belvin Marcia	CSO	Sale	31,492	$6.42	$202,273
2026-03-19	2026-03-17	Ogden Christopher	CFO	Sale	19,323	$6.42	$124,112
2026-02-04	2026-02-02	Chu Yu-Waye	CMO	Award	300,000	$0.00	$0
2026-02-04	2026-02-02	Mccarthy Sean A.	CEO	Award	980,000	$0.00	$0
2026-02-04	2026-02-02	Belvin Marcia	CSO	Award	250,000	$0.00	$0
2026-02-04	2026-02-02	Ogden Christopher	CFO	Award	325,000	$0.00	$0
2026-02-04	2026-02-02	Lester Rachael	CBO	Award	50,000	$0.00	$0
2025-11-10	2025-11-06	Mccarthy Sean A.	CEO	Sale	101,793	$4.54	-$461,937

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