Company · Ownership research

PubMatic, Inc. PUBM

CIK 0001422930 · CUSIP 74467Q103

Insider trading Initial holdings Institutional holders

Quarter-end disclosures, not live holdings.

Several CUSIPs are reported for this company; this page shows CUSIP 74467Q103 (PUBM), not CUSIP 74467Q903 (PUBM), CUSIP 74467Q953 (PUBM), and does not merge CUSIPs.

This page lists the top 20 of 153 rows by value; the complete set is available through the API.

Some filings reported values in thousands; those figures were scaled ×1,000 to dollars.

Top 20 institutions

Weight means this stock's share of the manager's own portfolio.

By reported value

#	Manager	Value	Manager weight	Change vs prior	Source
01	Graham Holdings Co CIK 104889 · View history	$27.80M 3,398,904 shares	2.88%	+567.44K(+20.00%)Added	SEC filing ↗ May 15, 2026	▾
02	BlackRock, Inc. CIK 2012383 · View history	$25.07M 3,065,036 shares	0.00%	-58.13K(-1.90%)Reduced	SEC filing ↗ May 13, 2026	▾
03	CenterBook Partners LP CIK 1872738 · View history	$14.25M 1,742,100 shares	0.77%	+595.04K(+51.90%)Added	SEC filing ↗ May 5, 2026	▾
04	VANGUARD CAPITAL MANAGEMENT LLC CIK 2100119 · Amended · View history	$13.20M 1,613,769 shares	0.00%	—	SEC filing ↗ May 15, 2026	▾
05	ACADIAN ASSET MANAGEMENT LLC CIK 916542 · View history	$12.89M 1,576,540 shares	0.02%	+650.17K(+70.20%)Added	SEC filing ↗ May 13, 2026	▾
06	RENAISSANCE TECHNOLOGIES LLC CIK 1037389 · View history	$12.60M 1,540,533 shares	0.02%	+321.20K(+26.30%)Added	SEC filing ↗ May 14, 2026	▾
07	DIMENSIONAL FUND ADVISORS LP CIK 354204 · View history	$10.19M 1,245,359 shares	0.00%	-26.59K(-2.10%)Reduced	SEC filing ↗ May 7, 2026	▾
08	GEODE CAPITAL MANAGEMENT, LLC CIK 1214717 · View history	$7.78M 950,605 shares	0.00%	+44.66K(+4.90%)Added	SEC filing ↗ May 15, 2026	▾
09	JACOBS LEVY EQUITY MANAGEMENT, INC CIK 884414 · View history	$7.63M 932,213 shares	0.03%	+2.96K(+0.30%)Added	SEC filing ↗ May 15, 2026	▾
10	STATE STREET CORP CIK 93751 · View history	$6.47M 791,419 shares	0.00%	-38.58K(-4.60%)Reduced	SEC filing ↗ May 15, 2026	▾
11	ROYAL BANK OF CANADA CIK 1000275 · View history	$6.05M 740,281 shares	0.00%	-122.91K(-14.20%)Reduced	SEC filing ↗ May 15, 2026	▾
12	Whitefort Capital Management, LP CIK 1884931 · View history	$5.64M 690,000 shares	1.72%	+690.00KNew	SEC filing ↗ May 15, 2026	▾
13	S Squared Technology, LLC CIK 1322924 · Amended · View history	$5.53M 676,399 shares	2.09%	+395.43K(+140.70%)Added	SEC filing ↗ May 15, 2026	▾
14	VANGUARD PORTFOLIO MANAGEMENT LLC CIK 2100121 · Amended · View history	$5.23M 638,785 shares	0.00%	—	SEC filing ↗ May 8, 2026	▾
15	TWO SIGMA INVESTMENTS, LP CIK 1179392 · View history	$4.37M 534,449 shares	0.00%	+60.27K(+12.70%)Added	SEC filing ↗ May 15, 2026	▾
16	Simcoe Capital LLC CIK 2109203 · View history	$3.98M 486,252 shares	3.65%	+77.56K(+19.00%)Added	SEC filing ↗ May 8, 2026	▾
17	D. E. Shaw & Co., Inc. CIK 1009207 · View history	$3.64M 445,114 shares	0.00%	-101.38K(-18.60%)Reduced	SEC filing ↗ May 15, 2026	▾
18	Trexquant Investment LP CIK 1633445 · View history	$3.46M 422,423 shares	0.02%	+115.17K(+37.50%)Added	SEC filing ↗ May 15, 2026	▾
19	GOLDMAN SACHS GROUP INC CIK 886982 · View history	$2.90M 354,200 shares	0.00%	+104.71K(+42.00%)Added	SEC filing ↗ May 15, 2026	▾
20	TUDOR INVESTMENT CORP ET AL CIK 923093 · View history	$2.87M 351,112 shares	0.02%	+250.47K(+248.90%)Added	SEC filing ↗ May 15, 2026	▾

Showing 20 / 153 institutions. The complete set is available through the API.

Coverage & totals by quarter

Reporting institutions

153

Cancelled or null records excluded

Disclosed shares

28,841,263

Not deduplicated across managers

Disclosed value

$235.95M

Not market cap or free float

Reporting institutions by quarter

Counts also change with data coverage and reporting entities; they do not measure net buying. Distinct managers with a live stock row in this CUSIP; totals may include overlapping filings and are not a share of the company.

PubMatic, Inc. · Q1 2026

Explore all 153 reporting institutions.

This page includes 20 of 153 reporting institutions. Log in to look up the full history beyond 3 years, use advanced screening & filtering, download CSV, and get the complete set through the Akkru API.

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Sources, coverage & how to read this data

Figures are as reported to the SEC and merged with later amendments where Akkru could match them. Preview limits apply to what is listed, not to the totals, which come from the complete reported data. Nothing is zero-filled: a missing quarter or month is shown as missing.