$PUBM

$17.05 +$0.00 (0.0%) After hours

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

Ownership

13F as of Q2 2026 · 46.1M shares outstanding

Who owns PUBM?

By type of holder

Institutions 65.3% Insiders 0.0% Everyone else 34.7%

Concentration Top 10 holders own 35.3%

Graham Holdings Co 7.4% · BlackRock, Inc. 7.1%

Institutional ownership

65.3%

+3.1 pts vs last qtr

Institutional holders

151

-1 vs last qtr

Net shares bought

+1.4M

by institutions in Q2 2026

New / sold out

19 / 20

positions opened vs closed

How is ownership changing?

Institutions, last 8 quarters

Biggest buyers in Q2 2026

Highbridge Capital Management LLC NEW +644.6K
American Century Companies Inc +529.8K

Biggest sellers in Q2 2026

CenterBook Partners LP −1.3M
D. E. Shaw & Co., Inc. −400.8K

Who is planning to sell?

Notices of proposed sale, last 12 months

$14.4M

43 notices from 9 people

Shares covered

1.2M

2.70% of the company

Arranged in advance

89%

of the value is under a 10b5-1 plan

Under a 10b5-1 plan No plan

Largest proposed sellers

Rajeev Goel Officer 10b5-1 $5.73M
Rajeev Goel Director 10b5-1 $4.23M

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

+286.3%

+25.26% a year

Each share's claim on the business

−74.1%

shrank without buying or selling a share

Spent on buybacks vs paid in stock

$181M vs —

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+ years36% 3–5 years27% 1–3 years19% Under 1 year17%

Quarterly turnover

15.1%

of institutional shares changed hands

Top 10 managers, median time held

4.5 years

Super Investors

Investment managers reporting PUBM on Form 13F

Holder	Shares	% of company	Change vs last qtr	Held since	% of their book
GH Graham Holdings Co	3.4M	7.37%	Unchanged	2022	4.1%
Shares held by quarter Peak holding3.4M (Q1'26) Change over 8 quarters+1.1M Share of the company7.370% Graham Holdings Co's full portfolio →
B BlackRock, Inc.	3.3M	7.11%	+214.5K (+7.0%)	≤2021	0.0%
Shares held by quarter Peak holding3.5M (Q3'24) Change over 8 quarters−234.4K Share of the company7.110% BlackRock, Inc.'s full portfolio →

Graham Holdings Co

3.4M

% of company

7.37%

Change vs last qtr

Unchanged

Held since

2022

BlackRock, Inc.

3.3M

% of company

7.11%

Change vs last qtr

+214.5K (+7.0%)

Held since

≤2021

28 more super investors behind a free account

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

Institutional Funds

Mutual funds and ETFs reporting PUBM on Form N-PORT; together they hold 20.7% of the company

Fund	Position value	Shares	% of company	% of the fund	As of
VT Vanguard Total Stock Market Index Fund Vanguard Index Funds	$15.8M	1.2M	2.62%	0.00%	June 30, 2026
IR iShares Russell 2000 ETF iShares Trust	$13.6M	1.0M	2.25%	0.02%	June 30, 2026

Vanguard Total Stock Market Index Fund

Vanguard Index Funds

Position value

$15.8M

% of company

2.62%

% of the fund

0.00%

As of

June 30, 2026

iShares Russell 2000 ETF

iShares Trust

Position value

$13.6M

% of company

2.25%

% of the fund

0.02%

As of

June 30, 2026

23 more funds behind a free account

See every fund holding PubMatic, 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
GL Gimbel Lisa Insider	6.4K	0.01%	—	—	—	—
Insider holdings come from Form 3/4/5 filings, which are not quarterly. Share of the company0.010% Gimbel Lisa's insider activity →

Gimbel Lisa

Insider

6.4K

% of company

0.01%

Change vs last qtr

—

Held since

—

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