PUBM · PubMatic, Inc. · Shareholders & Ownership

$16.57 -0.67 (-3.89%)

Russell 2000 member Rebalance outlook locked

Market Cap

$785.28M

45.55M

Volume · Oct 26 389.9K Avg daily vol (3M) 692.3K

Every disclosed holder of PUBM in one list: 13F institutions, Schedule 13D and 13G filers, insiders (Forms 3, 4 and 5) and registered funds, each from its own latest filing. Holders nest by CIK and SEC reporting links, never by name, and each is summed once.

How the holder list picks a filing →

Who Owns PUBM

13F quarter Sep 30, 2026, combined view: filers that have not filed yet carry their Jun 30, 2026 positions

Holder group	Holders	Shares	% Out	Summed
Institutional (13F)	158	30,468,998	66.89%	Yes
Insiders (Forms 3, 4, 5)	0	0	0.00%	No
13D/G-only blocks	2	10,197,136	22.39%	Yes
Remaining	—	4,883,927	10.72%	Rest
Registered funds (N-PORT, not summed)	181	9,383,113	20.60%	No

Shares outstanding: 45,550,061, the issuer's latest cover-page count restated onto today's split basis.

Insiders are listed but not summed: the issuer has more than one class of common stock and Forms 3, 4 and 5 report one issuer-wide balance across them.

13D/G-only counts each filer's latest 13D or 13G that no 13F report of the listing contains, that names no 13F filer and that no counted insider files. Funds are never summed: their shares sit inside their advisers' 13F reports.

Holders of PUBM

One row per holder Every filing By ultimate parent

All 13F Funds Insiders 13D/G Non-US

#	Holder	Shares	% Out	Change	As of	Notes
1	Graham Holdings Co 13F CIK 104889 · Unknown · Jun 30, 2026 carried, not yet filed for the newest quarter	3,398,904	7.46%	0	Jun 30, 2026	carried, not yet filed for the newest quarter
2	BlackRock, Inc. 13F CIK 2012383 · Holding company · Jun 30, 2026 carried, not yet filed for the newest quarter	3,279,530	7.20%	+214,494	Jun 30, 2026	carried, not yet filed for the newest quarter
2.1	iShares Russell 2000 ETF Fund S000004344 · Registered fund · Jun 30, 2026 iShares Trust, not summed	1,035,572	2.27%	+98,788	Jun 30, 2026	iShares Trust, not summed
2.2	iShares Russell 2000 Value ETF Fund S000004342 · Registered fund · Jun 30, 2026 iShares Trust, not summed	368,096	0.81%	+44,759	Jun 30, 2026	iShares Trust, not summed
2.3	Master Small Cap Index Series Fund S000002716 · Registered fund · Jun 30, 2026 Quantitative Master Series LLC, not summed	68,728	0.15%	+10,185	Jun 30, 2026	Quantitative Master Series LLC, not summed
2.4	iShares Core S&P Total U.S. Stock Market ETF Fund S000004317 · Registered fund · Jun 30, 2026 iShares Trust, not summed	57,786	0.13%	-407	Jun 30, 2026	iShares Trust, not summed
2.5	Diversified Equity Alpha Master Portfolio Fund S000004282 · Registered fund · Jun 30, 2026 Master Investment Portfolio, not summed	16,956	0.04%	+5,768	Jun 30, 2026	Master Investment Portfolio, not summed
3	VANGUARD CAPITAL MANAGEMENT LLC 13F CIK 2100119 · Registered investment adviser · Jun 30, 2026 carried, not yet filed for the newest quarter	1,661,312	3.65%	+47,543	Jun 30, 2026	carried, not yet filed for the newest quarter
4	ACADIAN ASSET MANAGEMENT LLC 13F CIK 916542 · Unknown · Jun 30, 2026 carried, not yet filed for the newest quarter	1,573,911	3.46%	-2,629	Jun 30, 2026	carried, not yet filed for the newest quarter
5	DIMENSIONAL FUND ADVISORS LP 13F CIK 354204 · Registered investment adviser · Jun 30, 2026 carried, not yet filed for the newest quarter	1,491,121	3.27%	+245,762	Jun 30, 2026	carried, not yet filed for the newest quarter
5.1	U.S. SMALL CAP VALUE PORTFOLIO Fund S000000987 · Registered fund · Jul 31, 2026 DFA INVESTMENT DIMENSIONS GROUP INC, not summed	216,714	0.48%	-60,282	Jul 31, 2026	DFA INVESTMENT DIMENSIONS GROUP INC, not summed
5.2	U.S. Targeted Value Portfolio Fund S000000970 · Registered fund · Jul 31, 2026 DFA INVESTMENT DIMENSIONS GROUP INC, not summed	190,254	0.42%	+34,982	Jul 31, 2026	DFA INVESTMENT DIMENSIONS GROUP INC, not summed
5.3	Dimensional U.S. Targeted Value ETF Fund S000070901 · Registered fund · Jul 31, 2026 Dimensional ETF Trust, not summed	168,831	0.37%	-20,473	Jul 31, 2026	Dimensional ETF Trust, not summed
5.4	Dimensional U.S. Small Cap ETF Fund S000070906 · Registered fund · Jul 31, 2026 Dimensional ETF Trust, not summed	121,978	0.27%	-5,446	Jul 31, 2026	Dimensional ETF Trust, not summed
5.5	Dimensional US Small Cap Value ETF Fund S000075151 · Registered fund · Jul 31, 2026 Dimensional ETF Trust, not summed	117,940	0.26%	-8,068	Jul 31, 2026	Dimensional ETF Trust, not summed
6	RENAISSANCE TECHNOLOGIES LLC 13F CIK 1037389 · Registered investment adviser · Jun 30, 2026 carried, not yet filed for the newest quarter	1,421,049	3.12%	-119,484	Jun 30, 2026	carried, not yet filed for the newest quarter
7	VANGUARD TOTAL STOCK MARKET INDEX FUND Fund S000002848 · Registered fund · Jun 30, 2026 VANGUARD INDEX FUNDS, not summed	1,207,349	2.65%	+31,490	Jun 30, 2026	VANGUARD INDEX FUNDS, not summed
8	Whitefort Capital Management, LP 13F CIK 1884931 · Registered investment adviser · Jun 30, 2026 carried, not yet filed for the newest quarter	1,110,656	2.44%	+420,656	Jun 30, 2026	carried, not yet filed for the newest quarter
9	GEODE CAPITAL MANAGEMENT, LLC 13F CIK 1214717 · Registered investment adviser · Jun 30, 2026 carried, not yet filed for the newest quarter	991,800	2.18%	+41,195	Jun 30, 2026	carried, not yet filed for the newest quarter
10	VANGUARD PORTFOLIO MANAGEMENT LLC 13F CIK 2100121 · Registered investment adviser · Jun 30, 2026 carried, not yet filed for the newest quarter	947,548	2.08%	+308,763	Jun 30, 2026	carried, not yet filed for the newest quarter
11	JACOBS LEVY EQUITY MANAGEMENT, INC 13F CIK 884414 · Registered investment adviser · Jun 30, 2026 carried, not yet filed for the newest quarter	862,996	1.89%	-69,217	Jun 30, 2026	carried, not yet filed for the newest quarter
12	STATE STREET CORP 13F CIK 93751 · Bank · Jun 30, 2026 carried, not yet filed for the newest quarter	854,147	1.88%	+62,728	Jun 30, 2026	carried, not yet filed for the newest quarter
12.1	STATE STREET SMALL/MID CAP EQUITY INDEX PORTFOLIO Fund S000050332 · Registered fund · Jun 30, 2026 STATE STREET INSTITUTIONAL INVESTMENT TRUST, not summed	13,900	0.03%	+1,300	Jun 30, 2026	STATE STREET INSTITUTIONAL INVESTMENT TRUST, not summed
12.2	State Street Total Return V.I.S. Fund Fund S000001637 · Registered fund · Jun 30, 2026 STATE STREET VARIABLE INSURANCE SERIES FUNDS INC, not summed	986	0.00%	-10	Jun 30, 2026	STATE STREET VARIABLE INSURANCE SERIES FUNDS INC, not summed
12.3	State Street Balanced Index Fund Fund S000082802 · Registered fund · Jun 30, 2026 STATE STREET INSTITUTIONAL INVESTMENT TRUST, not summed	252	0.00%	0	Jun 30, 2026	STATE STREET INSTITUTIONAL INVESTMENT TRUST, not summed
13	S SQUARED TECHNOLOGY, LLC 13F CIK 1322924 · Registered investment adviser · Jun 30, 2026 carried, not yet filed for the newest quarter	748,099	1.64%	+71,700	Jun 30, 2026	carried, not yet filed for the newest quarter
14	Simcoe Capital LLC 13F CIK 2109203 · Registered investment adviser · Jun 30, 2026 carried, not yet filed for the newest quarter	693,903	1.52%	+207,651	Jun 30, 2026	carried, not yet filed for the newest quarter
15	HIGHBRIDGE CAPITAL MANAGEMENT LLC 13F CIK 919185 · Registered investment adviser · Jun 30, 2026 carried, not yet filed for the newest quarter	644,593	1.42%	+644,593	Jun 30, 2026	carried, not yet filed for the newest quarter
16	AMERICAN CENTURY COMPANIES INC 13F CIK 748054 · Unknown · Jun 30, 2026 carried, not yet filed for the newest quarter	642,076	1.41%	+529,804	Jun 30, 2026	carried, not yet filed for the newest quarter
17	TWO SIGMA INVESTMENTS, LP 13F CIK 1179392 · Registered investment adviser · Jun 30, 2026 carried, not yet filed for the newest quarter	638,102	1.40%	+103,653	Jun 30, 2026	carried, not yet filed for the newest quarter
18	ROYAL BANK OF CANADA 13F CIK 1000275 · Bank · Jun 30, 2026 carried, not yet filed for the newest quarter	619,290	1.36%	-120,991	Jun 30, 2026	carried, not yet filed for the newest quarter
19	Nuveen, LLC 13F CIK 1871926 · Unknown · Jun 30, 2026 carried, not yet filed for the newest quarter	464,187	1.02%	+381,254	Jun 30, 2026	carried, not yet filed for the newest quarter
19.1	Nuveen Quant Small Cap Equity Fund Fund S000005386 · Registered fund · Jul 31, 2026 TIAA-CREF Funds, not summed	449,390	0.99%	—	Jul 31, 2026	TIAA-CREF Funds, not summed
19.2	Nuveen Small Cap Blend Index Fund Fund S000005367 · Registered fund · Jul 31, 2026 TIAA-CREF Funds, not summed	47,262	0.10%	0	Jul 31, 2026	TIAA-CREF Funds, not summed
19.3	Nuveen Equity Index Fund Fund S000005360 · Registered fund · Jul 31, 2026 TIAA-CREF Funds, not summed	32,801	0.07%	0	Jul 31, 2026	TIAA-CREF Funds, not summed
19.4	Nuveen Life Small Cap Equity Fund Fund S000005093 · Registered fund · Jun 30, 2026 TIAA-CREF Life Funds, not summed	7,339	0.02%	—	Jun 30, 2026	TIAA-CREF Life Funds, not summed
19.5	TIAA Separate Account VA-1 - Stock Index Account Fund S000005098 · Registered fund · Jun 30, 2026 TIAA Separate Account VA-1, not summed	1,094	0.00%	0	Jun 30, 2026	TIAA Separate Account VA-1, not summed
20	VANGUARD EXTENDED MARKET INDEX FUND Fund S000002841 · Registered fund · Jun 30, 2026 VANGUARD INDEX FUNDS, not summed	415,726	0.91%	+18,695	Jun 30, 2026	VANGUARD INDEX FUNDS, not summed
21	CITADEL ADVISORS LLC 13F CIK 1423053 · Registered investment adviser · Jun 30, 2026 carried, not yet filed for the newest quarter	414,880	0.91%	+265,837	Jun 30, 2026	carried, not yet filed for the newest quarter
22	CenterBook Partners LP 13F CIK 1872738 · Registered investment adviser · Jun 30, 2026 carried, not yet filed for the newest quarter	413,983	0.91%	-1,328,117	Jun 30, 2026	carried, not yet filed for the newest quarter
23	Trexquant Investment LP 13F CIK 1633445 · Registered investment adviser · Jun 30, 2026 carried, not yet filed for the newest quarter	382,525	0.84%	-39,898	Jun 30, 2026	carried, not yet filed for the newest quarter
24	NORTHERN TRUST CORP 13F CIK 73124 · Bank · Jun 30, 2026 carried, not yet filed for the newest quarter	348,134	0.76%	+57,573	Jun 30, 2026	carried, not yet filed for the newest quarter
24.1	Small Cap Index Fund Fund S000001245 · Registered fund · Jun 30, 2026 Northern Funds, not summed	19,526	0.04%	+255	Jun 30, 2026	Northern Funds, not summed
24.2	Small Cap Core Fund Fund S000001244 · Registered fund · Jun 30, 2026 Northern Funds, not summed	10,061	0.02%	—	Jun 30, 2026	Northern Funds, not summed
25	Avantis U.S. Small Cap Value ETF Fund S000066459 · Registered fund · May 31, 2026 American Century ETF Trust, not summed	343,971	0.76%	—	May 31, 2026	American Century ETF Trust, not summed
26	CHARLES SCHWAB INVESTMENT MANAGEMENT INC 13F CIK 884546 · Registered investment adviser · Jun 30, 2026 carried, not yet filed for the newest quarter	303,624	0.67%	+8,821	Jun 30, 2026	carried, not yet filed for the newest quarter
26.1	Schwab U.S. Small-Cap ETF Fund S000026636 · Registered fund · May 31, 2026 SCHWAB STRATEGIC TRUST, not summed	168,732	0.37%	+404	May 31, 2026	SCHWAB STRATEGIC TRUST, not summed
26.2	Schwab Small-Cap Index Fund Fund S000005912 · Registered fund · Jul 31, 2026 SCHWAB CAPITAL TRUST, not summed	94,371	0.21%	+11,463	Jul 31, 2026	SCHWAB CAPITAL TRUST, not summed
26.3	Schwab U.S. Broad Market ETF Fund S000026631 · Registered fund · May 31, 2026 SCHWAB STRATEGIC TRUST, not summed	24,127	0.05%	0	May 31, 2026	SCHWAB STRATEGIC TRUST, not summed
26.4	Schwab Total Stock Market Index Fund Fund S000005913 · Registered fund · Jul 31, 2026 SCHWAB CAPITAL TRUST, not summed	19,365	0.04%	-19,227	Jul 31, 2026	SCHWAB CAPITAL TRUST, not summed
27	PANAGORA ASSET MANAGEMENT INC 13F CIK 883677 · Registered investment adviser · Jun 30, 2026 carried, not yet filed for the newest quarter	287,735	0.63%	+11,479	Jun 30, 2026	carried, not yet filed for the newest quarter
28	AQR CAPITAL MANAGEMENT LLC 13F CIK 1167557 · Registered investment adviser · Jun 30, 2026 carried, not yet filed for the newest quarter	286,438	0.63%	+161,484	Jun 30, 2026	carried, not yet filed for the newest quarter
29	MORGAN STANLEY 13F CIK 895421 · Holding company · Jun 30, 2026 carried, not yet filed for the newest quarter	284,256	0.62%	-57,414	Jun 30, 2026	carried, not yet filed for the newest quarter
30	VANGUARD STRATEGIC SMALL-CAP EQUITY FUND Fund S000012432 · Registered fund · Jun 30, 2026 VANGUARD HORIZON FUNDS, not summed	282,497	0.62%	+220,215	Jun 30, 2026	VANGUARD HORIZON FUNDS, not summed
31	Quantinno Capital Management LP 13F CIK 1759654 · Registered investment adviser · Jun 30, 2026 carried, not yet filed for the newest quarter	249,688	0.55%	+42,873	Jun 30, 2026	carried, not yet filed for the newest quarter
32	VANGUARD FIDUCIARY TRUST CO 13F CIK 933478 · Unknown · Jun 30, 2026 carried, not yet filed for the newest quarter	240,677	0.53%	+10,048	Jun 30, 2026	carried, not yet filed for the newest quarter
33	GOLDMAN SACHS GROUP INC 13F CIK 886982 · Holding company · Jun 30, 2026 carried, not yet filed for the newest quarter	240,578	0.53%	-113,622	Jun 30, 2026	carried, not yet filed for the newest quarter
33.1	Goldman Sachs Small Cap Value Insights Fund Fund S000014929 · Registered fund · Jul 31, 2026 Goldman Sachs Trust, not summed	11,130	0.02%	—	Jul 31, 2026	Goldman Sachs Trust, not summed
34	VANGUARD STRATEGIC EQUITY FUND Fund S000002593 · Registered fund · Jun 30, 2026 VANGUARD HORIZON FUNDS, not summed	229,676	0.50%	+56,791	Jun 30, 2026	VANGUARD HORIZON FUNDS, not summed
35	JPMORGAN CHASE & CO 13F CIK 19617 · Bank · Jun 30, 2026 carried, not yet filed for the newest quarter	224,952	0.49%	-15,515	Jun 30, 2026	carried, not yet filed for the newest quarter
36	FRANKLIN RESOURCES INC 13F CIK 38777 · Investment adviser · Jun 30, 2026 carried, not yet filed for the newest quarter	223,316	0.49%	+85,136	Jun 30, 2026	carried, not yet filed for the newest quarter
36.1	Putnam Dynamic Asset Allocation Growth Fund Fund S000000780 · Registered fund · Jun 30, 2026 Putnam Asset Allocation Funds, not summed	26,883	0.06%	0	Jun 30, 2026	Putnam Asset Allocation Funds, not summed
36.2	Franklin Small Cap Enhanced ETF Fund S000097279 · Registered fund · Jun 30, 2026 Franklin Templeton ETF Trust, not summed	23,839	0.05%	-2,915	Jun 30, 2026	Franklin Templeton ETF Trust, not summed
36.3	Putnam Dynamic Asset Allocation Balanced Fund Fund S000000778 · Registered fund · Jun 30, 2026 Putnam Asset Allocation Funds, not summed	18,352	0.04%	0	Jun 30, 2026	Putnam Asset Allocation Funds, not summed
36.4	Putnam Dynamic Asset Allocation Conservative Fund Fund S000000779 · Registered fund · Jun 30, 2026 Putnam Asset Allocation Funds, not summed	2,898	0.01%	0	Jun 30, 2026	Putnam Asset Allocation Funds, not summed
36.5	Putnam Multi-Asset Income Fund Fund S000067964 · Registered fund · May 31, 2026 Putnam Asset Allocation Funds, not summed	1,735	0.00%	+508	May 31, 2026	Putnam Asset Allocation Funds, not summed
37	JANE STREET GROUP, LLC 13F CIK 1595888 · Unknown · Jun 30, 2026 carried, not yet filed for the newest quarter	199,131	0.44%	-10,869	Jun 30, 2026	carried, not yet filed for the newest quarter
38	VANGUARD RUSSELL 2000 INDEX FUND Fund S000030003 · Registered fund · May 31, 2026 VANGUARD SCOTTSDALE FUNDS, not summed	196,671	0.43%	+9,516	May 31, 2026	VANGUARD SCOTTSDALE FUNDS, not summed
39	ARROWSTREET CAPITAL, LIMITED PARTNERSHIP 13F CIK 1164508 · Registered investment adviser · Jun 30, 2026 carried, not yet filed for the newest quarter	195,563	0.43%	-10,724	Jun 30, 2026	carried, not yet filed for the newest quarter
40	UBS Group AG 13F CIK 1610520 · Bank · Jun 30, 2026 carried, not yet filed for the newest quarter	186,033	0.41%	+107,453	Jun 30, 2026	carried, not yet filed for the newest quarter
41	SUSQUEHANNA INTERNATIONAL GROUP, LLP 13F CIK 1446194 · Unknown · Jun 30, 2026 carried, not yet filed for the newest quarter	182,447	0.40%	-56,537	Jun 30, 2026	carried, not yet filed for the newest quarter
42	BOOTHBAY FUND MANAGEMENT, LLC 13F CIK 1549230 · Registered investment adviser · Jun 30, 2026 carried, not yet filed for the newest quarter	181,615	0.40%	+181,615	Jun 30, 2026	carried, not yet filed for the newest quarter
43	BRIDGEWAY CAPITAL MANAGEMENT, LLC 13F CIK 1107261 · Registered investment adviser · Jun 30, 2026 carried, not yet filed for the newest quarter	175,300	0.38%	0	Jun 30, 2026	carried, not yet filed for the newest quarter
43.1	Small-Cap Value Fund Fund S000004427 · Registered fund · Jun 30, 2026 Bridgeway Funds, Inc., not summed	100,000	0.22%	0	Jun 30, 2026	Bridgeway Funds, Inc., not summed
43.2	Ultra-Small Company Market Fund Fund S000004424 · Registered fund · Jun 30, 2026 Bridgeway Funds, Inc., not summed	44,100	0.10%	0	Jun 30, 2026	Bridgeway Funds, Inc., not summed
43.3	Ultra-Small Company Fund Fund S000004423 · Registered fund · Jun 30, 2026 Bridgeway Funds, Inc., not summed	25,000	0.05%	0	Jun 30, 2026	Bridgeway Funds, Inc., not summed
44	BANK OF AMERICA CORP /DE/ 13F CIK 70858 · Bank · Jun 30, 2026 carried, not yet filed for the newest quarter	173,956	0.38%	+78,526	Jun 30, 2026	carried, not yet filed for the newest quarter
45	Pinnacle Holdings, LLC 13F CIK 1411784 · Registered investment adviser · Jun 30, 2026 carried, not yet filed for the newest quarter	158,250	0.35%	+366	Jun 30, 2026	carried, not yet filed for the newest quarter
46	P.A.W. CAPITAL CORP 13F CIK 949853 · Unknown · Jun 30, 2026 carried, not yet filed for the newest quarter	150,000	0.33%	-30,000	Jun 30, 2026	carried, not yet filed for the newest quarter
47	VANGUARD COMMUNICATION SERVICES INDEX FUND Fund S000004443 · Registered fund · May 31, 2026 VANGUARD WORLD FUND, not summed	143,720	0.32%	+2,568	May 31, 2026	VANGUARD WORLD FUND, not summed
48	Diversified Investment Strategies, LLC 13F CIK 1427196 · Registered investment adviser · Jun 30, 2026 carried, not yet filed for the newest quarter	140,000	0.31%	0	Jun 30, 2026	carried, not yet filed for the newest quarter
49	AMERIPRISE FINANCIAL INC 13F CIK 820027 · Investment adviser · Jun 30, 2026 carried, not yet filed for the newest quarter	134,001	0.29%	0	Jun 30, 2026	carried, not yet filed for the newest quarter
49.1	Columbia Research Enhanced Small Cap ETF Fund S000095313 · Registered fund · Jun 30, 2026 Columbia ETF Trust I, not summed	57	0.00%	0	Jun 30, 2026	Columbia ETF Trust I, not summed
50	Multi-Manager Small Cap Equity Strategies Fund Fund S000036206 · Registered fund · May 31, 2026 COLUMBIA FUNDS SERIES TRUST I, not summed	133,839	0.29%	0	May 31, 2026	COLUMBIA FUNDS SERIES TRUST I, not summed

25 more nested rows are not shown here; Every filing lists them all.

Shares are restated onto today's split basis. Change compares each row with the same holder's previous filing in the same source; a dash means there is none to compare. Nested 13D/G, insider and fund rows are not summed, since a 13F report already holds them.

Showing 1–50 of 266 holders

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Key facts CIK 1422930 CUSIP 74467Q103 13F (30d) 21 filings 21 filers Visit website Investor relations