CytomX Therapeutics, Inc. CTMX NASDAQ

NASDAQ Global Select • Healthcare • Biotechnology • US • USD

SharesGrow Score

69/100

4/7 Pass

SharesGrow Intrinsic Value

CytomX Therapeutics, Inc. (CTMX) has 20 known insider and institutional holders on record. The largest holder is THIRD ROCK VENTURES LP with 3,320,348 shares. Other notable holders include SHANNON TIMOTHY M and Canaan IX L.P..

Over the last 12 months, insiders have made 29 transactions in CTMX stock — 17 buys (valued at $10.67M) and 8 sells (valued at $1.9M). Insider buying has outpaced selling during this period, which may signal confidence in the company's prospects.

CTMX Insider Ownership

Top Holder

THIRD ROCK VENTURES LP

3,320,348 shares

Buys (12 mo)

$10.67M value

Sells (12 mo)

$1.9M value

12-Month Transaction Activity

Buy 59%

Sell 28%

Top Insider Holders

#	Name	Role	Shares Owned	Last Filed	Relative Size
1	Third Rock Ventures Lp	10 Percent Owner	3,320,348	2017-10-19	100%
2	Shannon Timothy M	Director	3,244,381	2016-12-01	98%
3	Canaan Ix L.p.	Director	2,494,381	2017-03-28	75%
4	Mccarthy Sean A.	CEO	1,078,922	2026-03-19	32%
5	Bvf Partners L P/il	10 Percent Owner	358,450	2020-12-28	11%
6	Belvin Marcia	SVP, Chief Scientific Officer	300,760	2026-03-19	9%
7	Ogden Christopher	Chief Financial Officer	296,948	2026-03-19	9%
8	Chu Yu-waye	Chief Medical Officer	189,446	2026-03-19	6%
9	Rowland Lloyd A	General Counsel	120,594	2025-03-20	4%
10	Kavanaugh William Michael	CSO, Head Res.&non-clin. Dev.	120,000	2020-02-19	4%
11	Landau Jeffrey B	Chief Business Officer	110,060	2024-03-21	3%
12	Humphrey Rachel	Chief Medical Officer	90,000	2019-01-29	3%
13	Ray Debanjan	Chief Financial Officer	90,000	2019-01-29	3%
14	Ladd Cynthia J	Senior VP and General Counsel	84,000	2017-01-27	3%
15	Peterson Amy C.	EVP, Chief Development Officer	58,433	2023-03-20	2%
16	Campoy Carlos	Chief Financial Officer	38,224	2023-03-20	1%
17	Mohindru Mani	Director	38,000	2025-06-13	1%
18	Su Zhen	Director	38,000	2025-06-13	1%
19	Meyers James R	Director	38,000	2025-06-13	1%
20	Jones Elaine V	Director	38,000	2025-06-13	1%

Recent Transactions (last 12 months)

Date	Name	Role	Type	Shares	Price	Value
2026-03-17	Belvin Marcia	SVP, Chief Scientific Officer	Informative Sell	31,492	$6.42	$202.27K
2026-03-17	Ogden Christopher	Chief Financial Officer	Informative Sell	19,323	$6.42	$124.11K
2026-03-17	Chu Yu-waye	Chief Medical Officer	Informative Sell	21,279	$6.42	$136.68K
2026-03-17	Mccarthy Sean A.	CEO	Informative Sell	118,969	$6.42	$764.14K
2026-02-02	Lester Rachael	Chief Business Officer	RSU Award	20,000	-	-
2026-02-02	Belvin Marcia	SVP, Chief Scientific Officer	RSU Award	250,000	$6.09	$1.52M
2026-02-02	Ogden Christopher	Chief Financial Officer	RSU Award	90,000	-	-
2026-02-02	Chu Yu-waye	Chief Medical Officer	RSU Award	75,000	-	-
2026-02-02	Mccarthy Sean A.	CEO	RSU Award	980,000	$6.09	$5.97M
2025-11-06	Mccarthy Sean A.	CEO	Informative Sell	101,793	$4.54	$461.91K
2025-10-20	Lester Rachael	Chief Business Officer	RSU Award	650,000	$3.74	$2.43M
2025-10-20	Lester Rachael	Officer	Unknown	-	-	-
2025-09-26	Belvin Marcia	SVP, Chief Scientific Officer	RSU Award	18,150	-	-
2025-09-26	Ogden Christopher	Chief Financial Officer	RSU Award	39,150	-	-
2025-09-26	Chu Yu-waye	Chief Medical Officer	RSU Award	43,750	-	-
2025-09-26	Mccarthy Sean A.	CEO	RSU Award	285,000	-	-
2025-06-16	Belvin Marcia	SVP, Chief Scientific Officer	Informative Sell	13,884	$2.69	$37.33K
2025-06-13	Belvin Marcia	SVP, Chief Scientific Officer	Option Exercise (Sell)	37,500	-	-
2025-06-16	Ogden Christopher	Chief Financial Officer	Informative Sell	10,614	$2.69	$28.54K
2025-06-13	Ogden Christopher	Chief Financial Officer	Option Exercise (Sell)	37,500	-	-
2025-06-16	Mccarthy Sean A.	CEO	Informative Sell	55,511	$2.69	$149.26K
2025-06-13	Mccarthy Sean A.	CEO	Option Exercise (Sell)	150,000	-	-
2025-06-11	Su Zhen	Director	RSU Award	38,000	$2.82	$107.16K
2025-06-11	Ashworth Alan	Director	RSU Award	38,000	$2.82	$107.16K
2025-06-11	Mohindru Mani	Director	RSU Award	38,000	$2.82	$107.16K