PubMatic officer plans sale of 23,000 shares

PubMatic, Inc. (PUBM) received a notice that officer Mukul Kumar plans to sell up to 23,000 shares of common stock under Rule 144, through Morgan Stanley Smith Barney LLC, with an aggregate market value of $385,940.00.

Rhea-AI Filing Summary

PubMatic, Inc. (PUBM) received a notice that officer Mukul Kumar plans to sell up to 23,000 shares of common stock under Rule 144, through Morgan Stanley Smith Barney LLC, with an aggregate market value of $385,940.00. PubMatic had 37,303,647 shares outstanding as of the planned sale date of September 16, 2026.

The shares are to be sold for cash following the exercise of stock options, and related option exercises are expected over the next three months. In the prior three months, Kumar sold 23,897 shares of PubMatic common stock in three transactions, including two identified as 10b5-1 sales.

Key Figures

Shares to be sold under Rule 144: 23,000 shares Aggregate market value of planned sale: $385,940.00 Shares outstanding: 37,303,647 shares +3 more

6 metrics

Shares to be sold under Rule 144 23,000 shares Planned sale around September 16, 2026

Aggregate market value of planned sale $385,940.00 23,000 shares of PubMatic common stock

Shares outstanding 37,303,647 shares PubMatic common stock as of planned sale date

Sale on August 17, 2026 8,000 shares for $136,401.60 10b5-1 sale by Mukul Kumar

Sale on July 16, 2026 8,000 shares for $109,344.80 10b5-1 sale by Mukul Kumar

Sale on July 2, 2026 7,897 shares for $107,782.20 Sale by Mukul Kumar listed in past three months

Key Terms

Rule 144, 10b5-1, Exercise of Stock Options, Form 144

4 terms

Rule 144 regulatory

"See the definition of "person" in paragraph (a) of Rule 144."

Rule 144 is a U.S. securities regulation that sets conditions under which restricted or insider-held shares can be legally resold to the public, such as required holding periods, availability of public information, limits on how much can be sold at once, and certain filing requirements. For investors it matters because it determines when previously locked-up shares can enter the market — like a release valve that can increase supply, affect share price, and signal insider intent.

10b5-1 regulatory

"10b5-1 Sales for MUKUL KUMAR 601 MARSHALL STREET Redwood City CA 94063"

A 10b5-1 plan is a pre-set schedule that lets company insiders buy or sell shares according to written instructions made when they do not possess material, nonpublic information. Think of it as a timed automatic payment for stock trades: it helps insiders avoid accusations of trading on secret information and gives outside investors a clearer signal about whether sales are routine or potentially informative about the company’s prospects.

Exercise of Stock Options financial

"Common | 09/16/2026 | Exercise of Stock Options | Issuer"

Form 144 regulatory

"144: Filer Information"

Form 144 is a document that investors must file with the government when they plan to sell a large number of shares of a company's stock. It helps ensure transparency so everyone knows how many shares are being sold and when, which can impact the stock's price.

FAQ

AI-generated questions and answers. How Rhea-AI works. Not financial advice.

What does the Form 144 filing disclose for PUBM regarding Mukul Kumar?

It discloses that officer Mukul Kumar intends to sell up to 23,000 shares of PubMatic common stock under Rule 144, obtained through the exercise of stock options, with sales for cash expected around September 16, 2026.

How many PubMatic (PUBM) shares are covered by this Rule 144 notice?

The notice covers up to 23,000 shares of PubMatic common stock, with an indicated aggregate market value of $385,940.00, to be sold through Morgan Stanley Smith Barney LLC on or about September 16, 2026.

How many PUBM shares were outstanding at the time of the planned sale?

At the time of the planned sale, PubMatic reported 37,303,647 shares of common stock outstanding, as shown in the securities information section of the notice.

What prior sales of PubMatic (PUBM) stock by Mukul Kumar are listed?

The notice lists three sales in the past three months: 8,000 shares on August 17, 2026 for $136,401.60, 8,000 shares on July 16, 2026 for $109,344.80, and 7,897 shares on July 2, 2026 for $107,782.20.

Were the recent PUBM stock sales by Mukul Kumar under a 10b5-1 plan?

Two of the recent PubMatic stock sales are identified as 10b5-1 sales: 8,000 shares on August 17, 2026 and 8,000 shares on July 16, 2026. A 7,897-share sale on July 2, 2026 is listed without that designation.

How will Mukul Kumar acquire the PUBM shares he plans to sell?

The notice states that the securities to be sold were and will be received upon the exercise of stock options over the next three months, with the dates of acquisition and payment being the dates of exercise/sale.

AI-generated analysis. How Rhea-AI works. Not financial advice.

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Available on EDGAR 09/16/2026 - 04:41 PM Accepted by SEC EDGAR 09/16/2026 - 04:40 PM Learn about SEC filing dates

Form 144 Filer Information	UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Form 144 NOTICE OF PROPOSED SALE OF SECURITIES PURSUANT TO RULE 144 UNDER THE SECURITIES ACT OF 1933
FORM 144

144: Filer Information

Filer CIK	0001833462
Filer CCC	XXXXXXXX
Is this a LIVE or TEST Filing?	LIVE TEST
Submission Contact Information
Name
Phone
E-Mail Address

144: Issuer Information

Name of Issuer	PUBMATIC, INC.
SEC File Number	001-39748
Address of Issuer	601 MARSHALL STREET Redwood City CALIFORNIA 94063
Phone	6503313485
Name of Person for Whose Account the Securities are To Be Sold	MUKUL KUMAR
See the definition of "person" in paragraph (a) of Rule 144. Information is to be given not only as to the person for whose account the securities are to be sold but also as to all other persons included in that definition. In addition, information shall be given as to sales by all persons whose sales are required by paragraph (e) of Rule 144 to be aggregated with sales for the account of the person filing this notice.
Relationship to Issuer	Officer

144: Securities Information

Title of the Class of Securities To Be Sold	Name and Address of the Broker	Number of Shares or Other Units To Be Sold	Aggregate Market Value	Number of Shares or Other Units Outstanding	Approximate Date of Sale	Name the Securities Exchange
Common	Morgan Stanley Smith Barney LLC Executive Financial Services 1 New York Plaza 8th Floor New York NY 10004	23000	385940.00	37303647	09/16/2026	NASDAQ

Furnish the following information with respect to the acquisition of the securities to be sold and with respect to the payment of all or any part of the purchase price or other consideration therefor:

144: Securities To Be Sold

Title of the Class	Date you Acquired	Nature of Acquisition Transaction	Name of Person from Whom Acquired	Is this a Gift?	Date Donor Acquired	Amount of Securities Acquired	Date of Payment	Nature of Payment *
Common	09/16/2026	Exercise of Stock Options	Issuer			23000	09/16/2026	Cash

* If the securities were purchased and full payment therefor was not made in cash at the time of purchase, explain in the table or in a note thereto the nature of the consideration given. If the consideration consisted of any note or other obligation, or if payment was made in installments describe the arrangement and state when the note or other obligation was discharged in full or the last installment paid.

Furnish the following information as to all securities of the issuer sold during the past 3 months by the person for whose account the securities are to be sold.

144: Securities Sold During The Past 3 Months

Name and Address of Seller	Title of Securities Sold	Date of Sale	Amount of Securities Sold	Gross Proceeds
10b5-1 Sales for MUKUL KUMAR 601 MARSHALL STREET Redwood City CA 94063	Common	08/17/2026	8000	136401.60
10b5-1 Sales for MUKUL KUMAR 601 MARSHALL STREET Redwood City CA 94063	Common	07/16/2026	8000	109344.80
MUKUL KUMAR 601 MARSHALL STREET Redwood City CA 94063	Common	07/02/2026	7897	107782.20

144: Remarks and Signature

Remarks	The securities to be sold were and will be received upon the exercise of stock options over the next three months. The dates of acquisition and payment were and will be the dates of exercise/sale.
Date of Notice	09/16/2026
Date of Plan Adoption or Giving of Instruction, If Relying on Rule 10b5-1	03/03/2026
ATTENTION:
The person for whose account the securities to which this notice relates are to be sold hereby represents by signing this notice that he does not know any material adverse information in regard to the current and prospective operations of the Issuer of the securities to be sold which has not been publicly disclosed. If such person has adopted a written trading plan or given trading instructions to satisfy Rule 10b5-1 under the Exchange Act, by signing the form and indicating the date that the plan was adopted or the instruction given, that person makes such representation as of the plan adoption or instruction date.
Signature	Mukul Kumar
ATTENTION: Intentional misstatements or omission of facts constitute Federal Criminal Violations (See 18 U.S.C. 1001)