PubMatic CAO sells 500 shares at $16.43 each

PubMatic’s chief accounting officer reported a small, pre-planned Rule 10b5-1 sale of Class A shares, retaining over sixteen thousand shares afterward.

Rhea-AI Filing Summary

PubMatic, Inc. (PUBM) reported that its Chief Accounting Officer, Lisa Gimbel, sold 500 shares of Class A Common Stock on September 1, 2026 at an average price of $16.43 per share. The filing states the sale was made in a sale transaction and that she held 16,427 shares directly after the transaction. According to a footnote, this sale was effected under a Rule 10b5-1 trading plan adopted by her on May 13, 2026, indicating it was pre-arranged rather than opportunistic.

Insider Trade Summary 10b5-1

Net Seller: 500 shares

Net Sell 1 txn

Insider Gimbel Lisa

Role CHIEF ACCOUNTING OFFICER

Sold 500 shs ($8K)

Type	Security	Shares	Price	Value
Sale	Class A Common Stock F1	500	$16.43	$8K

Holdings After Transaction: Class A Common Stock — 16,427 shares (Direct)

Footnotes (1)

1. F1. The sales reported in this line item were effected pursuant to a Rule 10b5-1 trading plan adopted by the Reporting Person on May 13, 2026.

Key Figures

Shares sold: 500 shares Sale price: $16.43 per share Shares held after transaction: 16,427 shares +2 more

5 metrics

Shares sold 500 shares Class A Common Stock sale by Chief Accounting Officer on September 1, 2026

Sale price $16.43 per share Average price for the 500 PubMatic Class A shares sold on September 1, 2026

Shares held after transaction 16,427 shares Direct holdings of PubMatic Class A Common Stock by Lisa Gimbel after the sale

Rule 10b5-1 plan adoption date May 13, 2026 Date Lisa Gimbel adopted the Rule 10b5-1 trading plan governing the reported sale

Net shares sold in filing 500 shares Net share change across all transactions reported in this Form 4

Key Terms

Rule 10b5-1 trading plan, Class A Common Stock, open market or private transaction

3 terms

Rule 10b5-1 trading plan regulatory

"The sales reported in this line item were effected pursuant to a Rule 10b5-1 trading plan adopted by the Reporting Person on May 13, 2026."

A Rule 10b5-1 trading plan is a pre-arranged schedule that allows company insiders to buy or sell stock at specific times, even if they have inside information. It helps prevent accusations of unfair trading by making these transactions look planned and transparent, rather than sneaky or illegal.

Class A Common Stock financial

"security title Class A Common Stock for the reported sale transaction"

Class A common stock is a category of a company’s shares that carries a specific set of ownership rights—most commonly defined voting power and claims on dividends—set out in the company’s charter. For investors it matters because the class determines how much influence you have over corporate decisions, the share’s likely dividend and trading behavior, and how it compares in value to other share classes, like choosing a particular seat with different privileges at the company’s decision-making table.

open market or private transaction financial

"described as a sale in open market or private transaction"

FAQ

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

What insider transaction did PubMatic (PUBM) disclose for Lisa Gimbel?

PubMatic disclosed that Chief Accounting Officer Lisa Gimbel sold 500 shares of Class A Common Stock on September 1, 2026 in a sale transaction, leaving her with 16,427 shares held directly after the sale.

At what price were the PubMatic (PUBM) shares sold in this Form 4?

The reported transaction shows a sale of 500 shares of PubMatic Class A Common Stock at an average price of $16.43 per share on September 1, 2026, described as a sale in an open market or private transaction.

How many PubMatic (PUBM) shares does Lisa Gimbel hold after the reported sale?

After the reported sale, Chief Accounting Officer Lisa Gimbel held 16,427 shares of PubMatic Class A Common Stock directly. This figure is stated as her share balance following the September 1, 2026 transaction.

Was the PubMatic (PUBM) insider sale made under a Rule 10b5-1 trading plan?

Yes. A footnote states the sale was effected pursuant to a Rule 10b5-1 trading plan adopted by Lisa Gimbel on May 13, 2026, indicating the trade was pre-arranged under that plan.

What is the role of the insider involved in this PubMatic (PUBM) Form 4 filing?

The reporting person, Lisa Gimbel, serves as PubMatic’s Chief Accounting Officer. The Form 4 relates to her personal holdings of PubMatic Class A Common Stock and a sale she executed on September 1, 2026.

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

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Available on EDGAR 09/02/2026 - 04:08 PM EDT Accepted by SEC EDGAR 09/02/2026 - 04:07 PM EDT Learn about SEC filing dates

SEC Form 4

FORM 4

UNITED STATES SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

STATEMENT OF CHANGES IN BENEFICIAL OWNERSHIP

Filed pursuant to Section 16(a) of the Securities Exchange Act of 1934
or Section 30(h) of the Investment Company Act of 1940

OMB APPROVAL

OMB Number:			3235-0287
Estimated average burden
hours per response:			0.5

Check this box if no longer subject to Section 16. Form 4 or Form 5 obligations may continue. See Instruction 1(b).

X

Check this box to indicate that a transaction was made pursuant to a contract, instruction or written plan for the purchase or sale of equity securities of the issuer that is intended to satisfy the affirmative defense conditions of Rule 10b5-1(c). See Instruction 10.

1. Name and Address of Reporting Person^*

Gimbel Lisa

(Last) (First) (Middle)

C/O PUBMATIC, INC.

601 MARSHALL STREET

(Street)

REDWOOD CITY CALIFORNIA 94063

(City) (State) (Zip)

UNITED STATES

(Country)

2. Issuer Name and Ticker or Trading Symbol
PubMatic, Inc. [ PUBM ]

5. Relationship of Reporting Person(s) to Issuer
(Check all applicable)

	Director		10% Owner
X	Officer (give title below)		Other (specify below)
	CHIEF ACCOUNTING OFFICER

2a. Foreign Trading Symbol

3. Date of Earliest Transaction (Month/Day/Year)
09/01/2026

6. Individual or Joint/Group Filing (Check Applicable Line)

X	Form filed by One Reporting Person
	Form filed by More than One Reporting Person

4. If Amendment, Date of Original Filed (Month/Day/Year)

Table I - Non-Derivative Securities Acquired, Disposed of, or Beneficially Owned
1. Title of Security (Instr. 3)	2. Transaction Date (Month/Day/Year)	2A. Deemed Execution Date, if any (Month/Day/Year)	3. Transaction Code (Instr. 8)		4. Securities Acquired (A) or Disposed Of (D) (Instr. 3, 4 and 5)			5. Amount of Securities Beneficially Owned Following Reported Transaction(s) (Instr. 3 and 4)	6. Ownership Form: Direct (D) or Indirect (I) (Instr. 4)	7. Nature of Indirect Beneficial Ownership (Instr. 4)
			Code	V	Amount	(A) or (D)	Price
Class A Common Stock	09/01/2026		S(1)		500	D	$16.43	16,427	D

Table II - Derivative Securities Acquired, Disposed of, or Beneficially Owned (e.g., puts, calls, warrants, options, convertible securities)
1. Title of Derivative Security (Instr. 3)	2. Conversion or Exercise Price of Derivative Security	3. Transaction Date (Month/Day/Year)	3A. Deemed Execution Date, if any (Month/Day/Year)	4. Transaction Code (Instr. 8)		5. Number of Derivative Securities Acquired (A) or Disposed of (D) (Instr. 3, 4 and 5)		6. Date Exercisable and Expiration Date (Month/Day/Year)		7. Title and Amount of Securities Underlying Derivative Security (Instr. 3 and 4)		8. Price of Derivative Security (Instr. 5)	9. Number of derivative Securities Beneficially Owned Following Reported Transaction(s) (Instr. 4)	10. Ownership Form: Direct (D) or Indirect (I) (Instr. 4)	11. Nature of Indirect Beneficial Ownership (Instr. 4)
				Code	V	(A)	(D)	Date Exercisable	Expiration Date	Title	Amount or Number of Shares

Explanation of Responses:

1. The sales reported in this line item were effected pursuant to a Rule 10b5-1 trading plan adopted by the Reporting Person on May 13, 2026.

	/s/ Andrew Woods, Attorney-in-Fact	09/02/2026
	** Signature of Reporting Person	Date
Reminder: Report on a separate line for each class of securities beneficially owned directly or indirectly.
* If the form is filed by more than one reporting person, see Instruction 4 (b)(v).
** Intentional misstatements or omissions of facts constitute Federal Criminal Violations See 18 U.S.C. 1001 and 15 U.S.C. 78ff(a).
Note: File three copies of this Form, one of which must be manually signed. If space is insufficient, see Instruction 6 for procedure.
Persons who respond to the collection of information contained in this form are not required to respond unless the form displays a currently valid OMB Number.
* Form 4: SEC 1474 (03-26)