X0306 4 2020-12-11 0 0001422930 PubMatic, Inc. PUBM 0001547399 August Capital Management V, L.L.C. PMB #456, 660 4TH STREET SAN FRANCISCO CA 94107 0 0 1 0 0001452199 August Capital V Special Opportunities, L.P. PMB #456, 660 4TH STREET SAN FRANCISCO CA 94107 0 0 1 0 0001464232 August Capital Strategic Partners V, L.P. PMB #456, 660 4TH STREET SAN FRANCISCO CA 94107 0 0 1 0 0001547378 Hornik David C/O AUGUST CAPITAL PMB #456, 660 4TH STREET SAN FRANCISCO CA 94107 0 0 1 0 0001547424 Hartenbaum Howard C/O AUGUST CAPITAL PMB #456, 660 4TH STREET SAN FRANCISCO CA 94107 0 0 1 0 Class B Common Stock 2020-12-11 4 C 0 7173750 0.00 A Class A Common Stock 7173750 7173750 I See footnote Series D Preferred Stock 2020-12-11 4 C 0 6136776 0.00 D Class B Common Stock 6136776 0 I See footnote Series D Prime Preferred Stock 2020-12-11 4 C 0 1036974 0.00 D Class B Common Stock 1036974 0 I See footnote Each share of Class B common stock held by the Issuer's executive officers, directors and their respective affiliates will convert automatically into one share of Class A common stock upon any transfer that occurs after the closing of the Issuer's initial public offering, except for certain permitted transfers. These securities are held by August Capital V Special Opportunities, L.P., as nominee for August Capital V Special Opportunities, L.P., August Capital Strategic Partners V, L.P. and related individuals (collectively, the August Capital Funds). August Capital Management V, L.L.C. is the general partner of the August Capital Funds and may be deemed to have sole voting power and sole investment power over the shares held by the August Capital Funds. Howard Hartenbaum and David M. Hornik are the members of August Capital Management V, L.L.C. and they, along with W. Eric Carlborg as a voting party with respect to the Issuer's securities, may be deemed to share voting and investment power with respect to the shares held by the August Capital Funds. Each share of Series D Preferred Stock and Series D Prime Preferred Stock automatically converted into one share of Class B common stock immediately prior to the closing of the Issuer's initial public offering. The Series D Preferred Stock and Series D Prime Preferred Stock have no expiration date. This report is one of two reports, each on a separate Form 4, but relating to the same transactions being filed by entities and persons affiliated with August Capital. /s/ Abigail Hipps, Attorney-in-Fact for August Capital entities /s/ Abigail Hipps, Attorney-in-Fact for Howard Hartenbaum /s/ Abigail Hipps, Attorney-in-Fact for David Hornik 2020-12-11