X0306 4 2021-11-15 0 0001422930 PubMatic, Inc. PUBM 0001191203 CARLBORG W ERIC PMB #456, 660 4TH STREET SAN FRANCISCO CA 94107 1 0 1 0 Class A common stock 2021-11-15 4 C 0 2000000 A 2389237 I See footnote Class A common stock 2021-11-16 4 J 0 2000000 D 389237 I See footnote Class A common stock 2021-11-16 4 J 0 74954 A 184610 D Class B common stock 2021-11-15 4 C 0 2000000 0.00 D Class A common stock 2000000 1673750 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. (the "Fund"). August Capital Management V, L.L.C. is the general partner of the Fund (the "August General Partner") and may be deemed to have sole voting power and sole investment power over the shares held by the Fund. Howard Hartenbaum and David M. Hornik are the members of the August General Partner 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 Fund. Represents a pro-rata in-kind distribution of Class A common stock to the partners of the Fund and the members and assignees of the August General Partner, and not a purchase or sale, without additional consideration. Shares held directly by W. Eric Carlborg. 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. Each Reporting Person disclaims beneficial ownership of these shares except to the extent of such person's pecuniary interest therein, if any. /s/ Abigail Hipps, Attorney-in-Fact 2021-11-17