Amplitude (AMPL) CTO uses 53,878 shares to settle RSU taxes

Rhea-AI Filing Summary

Amplitude, Inc. (AMPL) reported an insider equity-compensation event for Chief Technology Officer and director Curtis Liu. On August 17, 2026, 53,878 shares of Class A common stock were withheld at $13.03 per share to satisfy tax withholding obligations arising from RSUs that vested on August 15, 2026; this withholding does not represent an open-market sale. After this transaction, Liu directly held 950,316 shares of Class A common stock, including 774,628 RSUs.

Insider Trade Summary

Net Seller: 53,878 shares

Net Sell 1 txn

Insider Liu Curtis

Role Chief Technology Officer

Type	Security	Shares	Price	Value
Tax Withholding	Class A Common Stock F1, F2	53,878	$13.03	$702K

Holdings After Transaction: Class A Common Stock — 950,316 shares (Direct)

Footnotes (2)

1. F1. Represents shares of the Issuer's Class A Common Stock withheld by the Issuer solely to satisfy tax withholding obligations in connection with the net issuance of shares of the Issuer's Class A Common Stock delivered to the reporting person on August 15, 2026, from the vesting of restricted stock units ("RSUs"), and does not represent a sale by the Reporting Person.
2. F2. Includes 774,628 RSUs.

Key Figures

Shares withheld for taxes: 53,878 shares Withholding reference price: $13.03 per share Shares held after transaction: 950,316 shares +1 more

4 metrics

Shares withheld for taxes 53,878 shares Class A Common Stock withheld on August 17, 2026 for tax withholding obligations

Withholding reference price $13.03 per share Price used for 53,878 shares withheld to satisfy tax withholding obligations

Shares held after transaction 950,316 shares Direct holdings of Class A Common Stock by Curtis Liu following the transaction

Included RSUs 774,628 RSUs Number of restricted stock units included in post-transaction holdings

Key Terms

restricted stock units, tax withholding obligations, net issuance

3 terms

restricted stock units financial

"from the vesting of restricted stock units ("RSUs")"

Restricted stock units are a type of company reward where employees are promised shares of stock, but they only fully own these shares after meeting certain conditions, like staying with the company for a set time. They matter because they can become valuable assets and are often used to motivate employees to help the company succeed.

tax withholding obligations financial

"withheld by the Issuer solely to satisfy tax withholding obligations"

net issuance financial

"in connection with the net issuance of shares of the Issuer's Class A"

FAQ

What did AMPL insider Curtis Liu report in this Form 4 filing?

Curtis Liu reported that 53,878 shares of Amplitude Class A common stock were withheld on August 17, 2026 to cover tax obligations related to vested RSUs. This was an administrative withholding, not an open-market sale.

Was the AMPL insider transaction a sale of shares by Curtis Liu?

No, the filing states the shares were withheld solely to satisfy tax withholding obligations from RSU vesting and "does not represent a sale" by Curtis Liu. It is a standard equity compensation tax-settlement event.

How many AMPL shares were withheld for taxes and at what price?

A total of 53,878 shares of Amplitude Class A common stock were withheld at $13.03 per share. The withholding covered tax obligations triggered by the net issuance of shares from RSU vesting on August 15, 2026.

How many AMPL shares does Curtis Liu hold after this Form 4 transaction?

After the tax-withholding transaction, Curtis Liu directly held 950,316 shares of Amplitude Class A common stock. This total includes 774,628 restricted stock units (RSUs) that remain outstanding as part of his equity compensation.

What role does Curtis Liu have at Amplitude, Inc. (AMPL)?

Curtis Liu is identified as Chief Technology Officer and a director of Amplitude, Inc., and is also listed as a ten percent owner. His Form 4 filing reflects transactions in his equity-based compensation holdings.

Does the AMPL Form 4 indicate use of a Rule 10b5-1 trading plan?

No, the Form 4 indicates the Rule 10b5-1 checkbox is not checked. The transaction instead reflects issuer share withholding for taxes on RSU vesting, rather than trading under a pre-arranged 10b5-1 plan.

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Form 4 Insider Transactions: What Each Field Means →

Available on EDGAR 08/18/2026 - 05:19 PM Accepted by SEC EDGAR 08/18/2026 - 05:19 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).

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^*

Liu Curtis

(Last) (First) (Middle)

C/O AMPLITUDE, INC.

(Street)

SAN FRANCISCO CALIFORNIA 94103

(City) (State) (Zip)

UNITED STATES

(Country)

2. Issuer Name and Ticker or Trading Symbol
Amplitude, Inc. [ AMPL ]

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

X	Director	X	10% Owner
X	Officer (give title below)		Other (specify below)
	Chief Technology Officer

2a. Foreign Trading Symbol

3. Date of Earliest Transaction (Month/Day/Year)
08/17/2026

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	08/17/2026		F(1)		53,878	D	$13.03	950,316(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. Represents shares of the Issuer's Class A Common Stock withheld by the Issuer solely to satisfy tax withholding obligations in connection with the net issuance of shares of the Issuer's Class A Common Stock delivered to the reporting person on August 15, 2026, from the vesting of restricted stock units ("RSUs"), and does not represent a sale by the Reporting Person.

2. Includes 774,628 RSUs.

	/s/ Elizabeth Fisher, as attorney in fact for Curtis Liu	08/18/2026
	** 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)