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Sean A. Mccarthy

CTMX
PRESIDENT AND CEO · CYTOMX THERAPEUTICS, INC. · CIK 0001654058
FILING MIX · LIFETIME59%/41%
BUYS
41
SELLS
28
TOTAL VALUE
$4.33M
COMPANIES
1
ACTIVE SINCE
Sep 2019
HOLDINGS NOW
1,078,922
AVG SELL PX
$5.56
TRADE KIND
SHOWING 69 / 69
Trades · vs SPY
Loading price series…
Performance · forward returns vs SPY
13 backtested trades · 8 horizons · 8 pendingHow are these numbers computed? →
Forward-return performance of every backtestable P/S trade by Sean A. Mccarthy, measured at 8 horizons from 7 days to 2 years. Deduped per economic event so co-filings count once. Excess return = trade return minus SPY return over the same window.
HORIZONTRADESWIN RATEINSIDER RETURNSPY RETURNMEAN EXCESSMEDIAN EXCESST-STAT
7d13+76.92%-7.19%+0.65%-7.84%-5.56%—
14d13+76.92%-7.71%+1.05%-8.76%-8.49%—
30d13+61.54%-5.06%+2.19%-7.25%-7.84%—
60d13+69.23%+6.87%+5.60%+1.26%-10.85%—
90d13+69.23%+12.53%+7.64%+4.88%-28.77%—
180d13(1 pending)+58.33%+21.07%+13.42%+7.65%-17.88%—
1y13(2 pending)+54.55%+40.85%+20.42%+20.43%-40.84%—
2y13(5 pending)+62.50%+7.09%+34.96%-27.86%-68.93%—
How to read this: Insider Returnis the average raw return of the filer's trades over the horizon. SPY Return is what SPY did over those same windows — reference only, not a comparison. The headline alpha number is Mean Excess = Insider − SPY; green means the filer beat SPY, red means they trailed it. Win rate is the share of individual trades where the filer beat SPY. T-statvalues above 2 mean the alpha is unlikely to be chance given the sample size. "Pending" counts trades where the horizon hasn't elapsed yet; their stats are not included in the row average.
Holdings over time
CTMX · 1,078,922 shares · as of Mar 17, 2026
0299,473598,946898,4181,197,8912020202120222023202420252026SHARES HELD
Trading cadence · quarterly flow
BUY ● SELL ●
2019
2019
2020
2020
2020
2020
2021
2021
2021
2021
2022
2022
2022
2022
2023
2023
2023
2023
2024
2024
2024
2024
2025
2025
2025
2025
2026
FLOW · 41 buys / 28 sellsCOVERAGE · 27 quarters
Form 4 filings · all activity
COMPANYTYPESHARESPRICEVALUEHELD AFTERTRADE DATEFILEDDETAILS
CTMX
CYTOMX THERAPEUTICS, INC.
SALE10b5-1
10b5-1 plan
118,969$6.42$764.1K1,078,922Mar 17, 2026Mar 19, 2026 ↗View →
CTMX
CYTOMX THERAPEUTICS, INC.
PURCHASEGRANT
Stock grant
980,000——980,000Feb 2, 2026Feb 4, 2026 ↗View →
CTMX
CYTOMX THERAPEUTICS, INC.
PURCHASEGRANT
Stock grant
210,000——1,197,891Feb 2, 2026Feb 4, 2026 ↗View →
CTMX
CYTOMX THERAPEUTICS, INC.
SALE10b5-1
10b5-1 plan
101,793$4.54$461.9K987,891Nov 6, 2025Nov 10, 2025 ↗View →
CTMX
CYTOMX THERAPEUTICS, INC.
PURCHASEGRANT
Stock grant
285,000——285,000Sep 26, 2025Sep 30, 2025 ↗View →
CTMX
CYTOMX THERAPEUTICS, INC.
PURCHASEGRANT
Stock grant
570,000——570,000Sep 26, 2025Sep 30, 2025 ↗View →
CTMX
CYTOMX THERAPEUTICS, INC.
SALE
CEO
55,511$2.69$149.3K1,089,684Jun 16, 2025Jun 17, 2025 ↗View →
CTMX
CYTOMX THERAPEUTICS, INC.
PURCHASE
CEO
150,000——1,145,195Jun 13, 2025Jun 17, 2025 ↗View →
CTMX
CYTOMX THERAPEUTICS, INC.
SALE
CEO
150,000——0Jun 13, 2025Jun 17, 2025 ↗View →
CTMX
CYTOMX THERAPEUTICS, INC.
SALE
CEO
37,656$0.60$22.6K995,195Mar 18, 2025Mar 20, 2025 ↗View →
CTMX
CYTOMX THERAPEUTICS, INC.
PURCHASEGRANT
Stock grant
195,000——1,032,851Feb 4, 2025Feb 6, 2025 ↗View →
CTMX
CYTOMX THERAPEUTICS, INC.
PURCHASEGRANT
Stock grant
180,000——837,851Feb 4, 2025Feb 6, 2025 ↗View →
CTMX
CYTOMX THERAPEUTICS, INC.
PURCHASEGRANT
Stock grant
390,000——390,000Feb 4, 2025Feb 6, 2025 ↗View →
CTMX
CYTOMX THERAPEUTICS, INC.
PURCHASEGRANT
Stock grant
800,000——800,000Feb 4, 2025Feb 6, 2025 ↗View →
CTMX
CYTOMX THERAPEUTICS, INC.
SALE
CEO
37,500——0Aug 20, 2024Aug 22, 2024 ↗View →
CTMX
CYTOMX THERAPEUTICS, INC.
SALE
CEO
13,898$1.23$17.1K657,851Aug 20, 2024Aug 22, 2024 ↗View →
CTMX
CYTOMX THERAPEUTICS, INC.
PURCHASE
CEO
37,500——671,749Aug 20, 2024Aug 22, 2024 ↗View →
CTMX
CYTOMX THERAPEUTICS, INC.
SALE
CEO
109,768——0Mar 26, 2024Mar 28, 2024 ↗View →
CTMX
CYTOMX THERAPEUTICS, INC.
PURCHASE
CEO
109,768$1.57$172.9K634,249Mar 26, 2024Mar 28, 2024 ↗View →
CTMX
CYTOMX THERAPEUTICS, INC.
SALE
CEO
20,223$2.09$42.2K524,481Mar 19, 2024Mar 21, 2024 ↗View →
CTMX
CYTOMX THERAPEUTICS, INC.
PURCHASEGRANT
Stock grant
420,000——420,000Jan 18, 2024Jan 19, 2024 ↗View →
CTMX
CYTOMX THERAPEUTICS, INC.
PURCHASEGRANT
Stock grant
260,000——260,000Jan 18, 2024Jan 19, 2024 ↗View →
CTMX
CYTOMX THERAPEUTICS, INC.
PURCHASEGRANT
Stock grant
90,000——544,704Jan 18, 2024Jan 19, 2024 ↗View →
CTMX
CYTOMX THERAPEUTICS, INC.
SALE
CEO
13,551$1.38$18.7K454,704Dec 20, 2023Dec 22, 2023 ↗View →
CTMX
CYTOMX THERAPEUTICS, INC.
PURCHASE
CEO
37,500——468,255Dec 17, 2023Dec 19, 2023 ↗View →
CTMX
CYTOMX THERAPEUTICS, INC.
SALE
CEO
37,500——37,500Dec 17, 2023Dec 19, 2023 ↗View →
CTMX
CYTOMX THERAPEUTICS, INC.
SALE
CEO
14,601$1.30$19.0K430,755Sep 22, 2023Sep 22, 2023 ↗View →
CTMX
CYTOMX THERAPEUTICS, INC.
PURCHASEGRANT
Stock grant
40,000——445,356Sep 20, 2023Sep 22, 2023 ↗View →
CTMX
CYTOMX THERAPEUTICS, INC.
PURCHASE
CEO
16,535$1.57$26.0K405,356May 19, 2023May 23, 2023 ↗View →
CTMX
CYTOMX THERAPEUTICS, INC.
SALE
CEO
16,535——119,536May 19, 2023May 23, 2023 ↗View →
CTMX
CYTOMX THERAPEUTICS, INC.
SALE
CEO
7,121$1.88$13.4K388,821Mar 16, 2023Mar 20, 2023 ↗View →
CTMX
CYTOMX THERAPEUTICS, INC.
PURCHASEGRANT
Stock grant
300,000——300,000Feb 2, 2023Feb 6, 2023 ↗View →
CTMX
CYTOMX THERAPEUTICS, INC.
PURCHASEGRANT
Stock grant
315,000——315,000Feb 2, 2023Feb 6, 2023 ↗View →
CTMX
CYTOMX THERAPEUTICS, INC.
PURCHASEGRANT
Stock grant
105,000——395,942Feb 2, 2023Feb 6, 2023 ↗View →
CTMX
CYTOMX THERAPEUTICS, INC.
PURCHASEGRANT
Stock grant
450,000——450,000Aug 10, 2022Aug 12, 2022 ↗View →
CTMX
CYTOMX THERAPEUTICS, INC.
PURCHASEGRANT
Stock grant
75,000——75,000Aug 10, 2022Aug 12, 2022 ↗View →
CTMX
CYTOMX THERAPEUTICS, INC.
SALE
President and CEO
14,911$1.42$21.2K290,942Jul 20, 2022Jul 21, 2022 ↗View →
CTMX
CYTOMX THERAPEUTICS, INC.
PURCHASEGRANT
Stock grant
40,000——305,853Jul 19, 2022Jul 21, 2022 ↗View →
CTMX
CYTOMX THERAPEUTICS, INC.
PURCHASE
President and CEO
66,742$0.95$63.1K241,664May 9, 2022May 11, 2022 ↗View →
CTMX
CYTOMX THERAPEUTICS, INC.
SALE
President and CEO
66,742——0May 9, 2022May 11, 2022 ↗View →
CTMX
CYTOMX THERAPEUTICS, INC.
SALE
President and CEO
24,189——0May 9, 2022May 11, 2022 ↗View →
CTMX
CYTOMX THERAPEUTICS, INC.
PURCHASE
President and CEO
24,189$0.95$22.9K265,853May 9, 2022May 11, 2022 ↗View →
CTMX
CYTOMX THERAPEUTICS, INC.
PURCHASEGRANT
Stock grant
450,000——450,000Feb 2, 2022Feb 4, 2022 ↗View →
CTMX
CYTOMX THERAPEUTICS, INC.
PURCHASEGRANT
Stock grant
75,000——174,922Feb 2, 2022Feb 4, 2022 ↗View →
CTMX
CYTOMX THERAPEUTICS, INC.
PURCHASEGRANT
Stock grant
100,000——100,000Oct 24, 2021Oct 26, 2021 ↗View →
CTMX
CYTOMX THERAPEUTICS, INC.
PURCHASEGRANT
Stock grant
80,000——80,000Oct 24, 2021Oct 26, 2021 ↗View →
CTMX
CYTOMX THERAPEUTICS, INC.
SALE
President and CEO
92,113——0Aug 11, 2021Aug 13, 2021 ↗View →
CTMX
CYTOMX THERAPEUTICS, INC.
PURCHASE
President and CEO
92,113$1.13$104.4K99,922Aug 11, 2021Aug 13, 2021 ↗View →
CTMX
CYTOMX THERAPEUTICS, INC.
SALE
President and CEO
100,000$7.04$704.5K93,118Jun 16, 2021Jun 21, 2021 ↗View →
CTMX
CYTOMX THERAPEUTICS, INC.
PURCHASE
President and CEO
30$1.13$347,839Jun 14, 2021Jun 16, 2021 ↗View →
CTMX
CYTOMX THERAPEUTICS, INC.
SALE
President and CEO
10——66,742Jun 14, 2021Jun 16, 2021 ↗View →
CTMX
CYTOMX THERAPEUTICS, INC.
SALE
President and CEO
30——92,113Jun 14, 2021Jun 16, 2021 ↗View →
CTMX
CYTOMX THERAPEUTICS, INC.
PURCHASE
President and CEO
10$0.95$97,849Jun 14, 2021Jun 16, 2021 ↗View →
CTMX
CYTOMX THERAPEUTICS, INC.
SALE
President and CEO
100,000$7.49$749.5K206,894Mar 31, 2021Apr 2, 2021 ↗View →
CTMX
CYTOMX THERAPEUTICS, INC.
SALE
President and CEO
100,000——92,143Mar 31, 2021Apr 2, 2021 ↗View →
CTMX
CYTOMX THERAPEUTICS, INC.
PURCHASE
President and CEO
100,000$1.13$113.4K306,894Mar 31, 2021Apr 2, 2021 ↗View →
CTMX
CYTOMX THERAPEUTICS, INC.
PURCHASEGRANT
Stock grant
200,000——200,000Feb 27, 2021Mar 2, 2021 ↗View →
CTMX
CYTOMX THERAPEUTICS, INC.
PURCHASEGRANT
Stock grant
400,000——400,000Feb 26, 2021Mar 2, 2021 ↗View →
CTMX
CYTOMX THERAPEUTICS, INC.
SALE
President and CEO
100,000——192,143Dec 23, 2020Dec 28, 2020 ↗View →
CTMX
CYTOMX THERAPEUTICS, INC.
PURCHASE
President and CEO
100,000$1.13$113.4K206,894Dec 23, 2020Dec 28, 2020 ↗View →
CTMX
CYTOMX THERAPEUTICS, INC.
PURCHASEGRANT
Stock grant
930$6.39$5.9K106,894Nov 30, 2020Dec 7, 2020 ↗View →
CTMX
CYTOMX THERAPEUTICS, INC.
SALE
President and CEO
20,500——0Sep 21, 2020Sep 23, 2020 ↗View →
CTMX
CYTOMX THERAPEUTICS, INC.
PURCHASE
President and CEO
20,500$6.61$135.6K105,964Sep 21, 2020Sep 23, 2020 ↗View →
CTMX
CYTOMX THERAPEUTICS, INC.
PURCHASEGRANT
Stock grant
1,158$5.11$5.9K85,464May 29, 2020Jun 2, 2020 ↗View →
CTMX
CYTOMX THERAPEUTICS, INC.
PURCHASE
President and CEO
36,000$1.13$40.8K120,306May 12, 2020May 14, 2020 ↗View →
CTMX
CYTOMX THERAPEUTICS, INC.
SALE
President and CEO
36,000——292,143May 12, 2020May 14, 2020 ↗View →
CTMX
CYTOMX THERAPEUTICS, INC.
SALE
President and CEO
36,000$15.00$540.0K84,306May 12, 2020May 14, 2020 ↗View →
CTMX
CYTOMX THERAPEUTICS, INC.
PURCHASEGRANT
Stock grant
500,000——500,000Feb 14, 2020Feb 19, 2020 ↗View →
CTMX
CYTOMX THERAPEUTICS, INC.
SALEGRANT
Gift
4,500——7,809Sep 30, 2019Jun 8, 2021 ↗View →
Other insiders · CTMX
Loading peer insiders…
About this filer
CIK 0001654058
ROLE
President and CEO
PRIMARY
CTMX
COMPANIES
1
ACTIVE SINCE
Sep 2019
MARKETPEEL · /INSIDER/0001654058DATA · SEC EDGAR · FORM 4 · CONSOLIDATED TAPE
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