PubMatic (PUBM) CAO Lisa Gimbel sells 500 shares under Rule 10b5-1 plan

Rhea-AI Filing Summary

PubMatic, Inc. reported that Chief Accounting Officer Lisa Gimbel sold 500 shares of Class A Common Stock on August 12, 2026 at $17.50 per share in an open-market sale pursuant to a Rule 10b5-1 trading plan. Following this transaction, she directly holds 14,561 shares, including 1,384 shares acquired on May 29, 2026 under the company’s employee stock purchase plan.

Insider Trade Summary 10b5-1

Net Seller: 500 shares

Net Sell 1 txn

Insider Gimbel Lisa

Role CHIEF ACCOUNTING OFFICER

Sold 500 shs ($9K)

Type	Security	Shares	Price	Value
Sale	Class A Common Stock F1, F2	500	$17.50	$9K

Holdings After Transaction: Class A Common Stock — 14,561 shares (Direct)

Footnotes (2)

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.
2. F2. Includes 1,384 shares of Class A Common Stock acquired by the Reporting Person on May 29, 2026 pursuant to the Issuer's employee stock purchase plan.

Key Figures

Shares sold: 500 shares Sale price: $17.50 per share Shares held after sale: 14,561 shares +1 more

4 metrics

Shares sold 500 shares Class A Common Stock sold on August 12, 2026

Sale price $17.50 per share Open-market or private transaction on August 12, 2026

Shares held after sale 14,561 shares Direct Class A Common Stock holdings following the reported transaction

ESPP shares included 1,384 shares Class A shares acquired on May 29, 2026 under employee stock purchase plan

Key Terms

Rule 10b5-1 trading plan, employee stock purchase plan, Class A Common Stock

3 terms

Rule 10b5-1 trading plan regulatory

"The sales reported ... were effected pursuant to a Rule 10b5-1 trading plan"

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.

employee stock purchase plan financial

"shares ... acquired ... pursuant to the Issuer's employee stock purchase plan"

An employee stock purchase plan is a company program that lets workers buy shares through small payroll deductions, often at a discount to the market price and after a set offering period. Think of it like a workplace savings plan that turns into ownership: it encourages employees to share in the company’s success and can create predictable buying or selling of stock that investors watch because it affects supply, demand and employee incentives.

Class A Common Stock financial

"security_title: Class A Common Stock for the reported 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.

FAQ

What did PubMatic (PUBM) insider Lisa Gimbel report in this Form 4?

Lisa Gimbel, PubMatic’s Chief Accounting Officer, reported selling 500 shares of Class A Common Stock at $17.50 per share on August 12, 2026. The sale was executed under a Rule 10b5-1 trading plan she adopted on May 13, 2026.

How many PubMatic (PUBM) shares did Lisa Gimbel sell and at what price?

She sold 500 shares of PubMatic Class A Common Stock at a price of $17.50 per share. The transaction was coded as a sale in the open market or a private transaction and was executed pursuant to a Rule 10b5-1 trading plan.

How many PubMatic (PUBM) shares does Lisa Gimbel own after this transaction?

After the August 12, 2026 sale, Lisa Gimbel directly holds 14,561 shares of PubMatic Class A Common Stock. This amount includes 1,384 shares she acquired on May 29, 2026 through PubMatic’s employee stock purchase plan.

Was the PubMatic (PUBM) insider sale by Lisa Gimbel under a Rule 10b5-1 plan?

Yes. The filing states the sales were effected pursuant to a Rule 10b5-1 trading plan adopted by Lisa Gimbel on May 13, 2026. Such pre-arranged plans allow insiders to schedule trades in advance.

What type of security did Lisa Gimbel trade in PubMatic (PUBM)?

Lisa Gimbel traded Class A Common Stock of PubMatic. The Form 4 reports a single non-derivative transaction involving the sale of 500 shares at $17.50 per share, with her holdings after the sale totaling 14,561 shares.

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Form 4 Insider Transactions: What Each Field Means →

Available on EDGAR 08/14/2026 - 04:39 PM Accepted by SEC EDGAR 08/14/2026 - 04:34 PM 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)
08/12/2026

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	08/12/2026		S(1)		500	D	$17.5	14,561(2)	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.

2. Includes 1,384 shares of Class A Common Stock acquired by the Reporting Person on May 29, 2026 pursuant to the Issuer's employee stock purchase plan.

	/s/ Andrew Woods, Attorney-in-Fact	08/14/2026
	** 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)