$CTMX

$2.23 -$0.09 (4.09%) Close

$CTMX Overview Financial Statements SEC Filings Executives News Red Flags Capital Raising Ownership Insider Transactions Congressional Trades

Ownership

13F as of Q2 2026 · 217.9M shares outstanding

Who owns CTMX?

By type of holder

Institutions 97.7% Insiders 1.2% Everyone else 1.1%

Concentration Top 10 holders own 61.3%

FMR LLC 15.0% · Kynam Capital Management, LP 10.0%

Institutional ownership

97.7%

+9.0 pts vs last qtr

Institutional holders

176

-3 vs last qtr

Net shares bought

+19.7M

by institutions in Q2 2026

New / sold out

46 / 49

positions opened vs closed

How is ownership changing?

Institutions, last 8 quarters

Biggest buyers in Q2 2026

BlackRock, Inc. +12.3M
Kynam Capital Management, LP +6.7M

Biggest sellers in Q2 2026

Venrock Adviser, LLC −5.0M
Jefferies Financial Group Inc. SOLD OUT −3.1M

Who is planning to sell?

Notices of proposed sale, last 12 months

$462K

1 notice from 1 person

Shares covered

101.8K

0.05% of the company

Arranged in advance

100%

of the value is under a 10b5-1 plan

Under a 10b5-1 plan No plan

Largest proposed sellers

Sean McCarthy Ceo 10b5-1 $462K

Every notice on Red Flags →

A Form 144 is notice of a planned sale, not the sale itself. What insiders actually sold is on Insider Transactions.

Is your stake being diluted?

Diluted share count, FY2019–FY2025

+52.1%

+7.24% a year

Each share's claim on the business

−34.3%

shrank without buying or selling a share

Spent on buybacks vs paid in stock

— vs $82.7M

over 7 fiscal years

Diluted shares, split-adjusted

Buybacks Stock-based comp

How patient are the owners?

Institutional shares by how long they've been held

5+ years50% 3–5 years2% 1–3 years30% Under 1 year18%

Quarterly turnover

20.3%

of institutional shares changed hands

Top 10 managers, median time held

5 years

Super Investors

Investment managers reporting CTMX on Form 13F

Holder	Shares	% of company	Change vs last qtr	Held since	% of their book
F FMR LLC	32.7M	15.01%	+759.3K (+2.4%)	≤2021	0.0%
Shares held by quarter Peak holding32.7M (Q2'26) Change over 8 quarters+32.4M Share of the company15.010% FMR LLC's full portfolio →
KC Kynam Capital Management, LP	21.7M	9.96%	+6.7M (+44.6%)	2025	4.5%
Shares held by quarter Peak holding21.7M (Q2'26) Change over 8 quarters+21.7M Share of the company9.960% Kynam Capital Management, LP's full portfolio →

FMR LLC

32.7M

% of company

15.01%

Change vs last qtr

+759.3K (+2.4%)

Held since

≤2021

Kynam Capital Management, LP

21.7M

% of company

9.96%

Change vs last qtr

+6.7M (+44.6%)

Held since

2025

28 more super investors behind a free account

See every manager holding CytomX Therapeutics, Inc., how their position has changed, and how long they've held it.

Institutional Funds

Mutual funds and ETFs reporting CTMX on Form N-PORT; together they hold 31.6% of the company

Fund	Position value	Shares	% of company	% of the fund	As of
SS State Street(R) SPDR(R) S&P(R) Biotech ETF SPDR Series Trust	$29.9M	8.0M	3.65%	0.28%	June 30, 2026
VT Vanguard Total Stock Market Index Fund Vanguard Index Funds	$23.4M	6.2M	2.86%	0.00%	June 30, 2026

State Street(R) SPDR(R) S&P(R) Biotech ETF

SPDR Series Trust

Position value

$29.9M

% of company

3.65%

% of the fund

0.28%

As of

June 30, 2026

Vanguard Total Stock Market Index Fund

Vanguard Index Funds

Position value

$23.4M

% of company

2.86%

% of the fund

0.00%

As of

June 30, 2026

23 more funds behind a free account

See every fund holding CytomX Therapeutics, Inc. and how much of the fund the position is.

Insiders and 5%+ holders

From Forms 3/4/5 and Schedules 13D/G

Holder	Shares	% of company	Change vs last qtr	8 quarters	Held since	% of their book
MS McCarthy Sean A. Insider	1.5M	0.68%	—	—	—	—
Insider holdings come from Form 3/4/5 filings, which are not quarterly. Share of the company0.680% McCarthy Sean A.'s insider activity →
BM Belvin Marcia Insider	300.8K	0.14%	—	—	—	—
Insider holdings come from Form 3/4/5 filings, which are not quarterly. Share of the company0.140% Belvin Marcia's insider activity →

McCarthy Sean A.

Insider

1.5M

% of company

0.68%

Change vs last qtr

—

Held since

—

Belvin Marcia

Insider

300.8K

% of company

0.14%

Change vs last qtr

—

Held since

—

5 more holders behind a free account

See every insider and 5%+ holder of CytomX Therapeutics, Inc..

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