Sell4

Amplitude, Inc.

AMPL

Total Value

$71.0K

Net $71.0K sold

Filing Date

Oct 2, 2026

2 transactions

Sales

$71.0K

2 transactions

Trade Summary

On Sep 30, 2026 through Oct 1, 2026, Skates Spenser, Insider, sold $71.0K of Amplitude, Inc. (AMPL) across 2 transactions. The filing covers Class A Common Stock and reflects net selling of $71.0K. Reported prices ranged from $14.45. Insider transactions are sourced from SEC Form 4 disclosures and should be reviewed alongside company fundamentals and the insider's broader trading history.

Price at the Time of the Trade

AMPL daily price with the insider's sale marked at $14.45.

Sold near the 6-month high · about level with today's price.

Price data is delayed and provided for context only — not investment advice.

Insider Information

Name: Skates Spenser
Role: Insider
Location: SAN FRANCISCO, CA

Filing Details

Filing Date: Oct 2, 2026
Transaction Date: Sep 30, 2026
Accession Number: 0001610717-26-000424
Form Type: 4
Net Trading Amount: -$71.0K

Non-Derivative Transactions

Date	Security	Shares	Price	Type	Value
Sep 30, 2026	Class A Common Stock	1,374	—	C	—
Sep 30, 2026	Class A Common Stock	1,374	$14.45	Sale	$19.9K
Oct 1, 2026	Class A Common Stock	3,539	—	C	—
Oct 1, 2026	Class A Common Stock	3,539	$14.45	Sale	$51.1K

Derivative Transactions

Date	Security	Shares	Exercise Price	Type	Value
Sep 30, 2026	AMPL derivative	1,374	—	C	—
Oct 1, 2026	AMPL derivative	3,539	—	C	—

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Footnotes

(F1)The Class B Common Stock is convertible at any time at the option of the holder into the Issuer's Class A Common Stock on a one-to-one basis. The Class B Common Stock will convert automatically into shares of the Issuer's Class A Common Stock on a one-to-one basis upon the earlier of (a) any transfer of the Class B Common Stock by the holder, whether or not for value, subject to certain exceptions, (b) the death or incapacity of Mr. Skates, (c) the date that is six months following the date on which Mr. Skates is no longer an employee or director of the Issuer (unless Mr. Skates has rejoined the Issuer during such six-month period) or (d) the date that is six months following the date on which none of the Issuer's founders is an employee or director of the Issuer (unless a founder has rejoined the Issuer during such six-month period).
(F2)The sales reported were effected pursuant to a 10b5-1 trading plan adopted by the Reporting Person's spouse on June 11, 2026.
(F3)This transaction was executed in multiple trades at prices ranging from $14.4500 to $14.4700. The price reported above reflects the weighted average sale price. The Reporting Person hereby undertakes to provide upon request to the SEC staff, the issuer or a security holder of the issuer full information regarding the number of shares and prices at which the transaction was effected.

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^*

Skates Spenser

(Last)

(First)

(Middle)

C/O AMPLITUDE, INC.

201 THIRD STREET, SUITE 200

(Street)

SAN FRANCISCO

94103

(City)

(State)

(Zip)

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)
	CEO and President

3. Date of Earliest Transaction (Month/Day/Year)
09/30/2026

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

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

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

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)
1. Title of Security (Instr. 3)	2. Transaction Date (Month/Day/Year)	2A. Deemed Execution Date, if any (Month/Day/Year)	Code	V	Amount	(A) or (D)	Price		6. Ownership Form: Direct (D) or Indirect (I) (Instr. 4)	7. Nature of Indirect Beneficial Ownership (Instr. 4)
Class A Common Stock	09/30/2026		C		1,374	A	$0⁽¹⁾	1,374	I	By Spouse
Class A Common Stock	09/30/2026		S⁽²⁾		1,374	D	$14.453⁽³⁾	0	I	By Spouse
Class A Common Stock	10/01/2026		C		3,539	A	$0⁽¹⁾	3,539	I	By Spouse
Class A Common Stock	10/01/2026		S⁽²⁾		3,539	D	$14.45	0	I	By Spouse

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)
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)	Code	V	(A)	(D)	Date Exercisable	Expiration Date	Title	Amount or Number of Shares	8. Price of Derivative Security (Instr. 5)		10. Ownership Form: Direct (D) or Indirect (I) (Instr. 4)	11. Nature of Indirect Beneficial Ownership (Instr. 4)
Class B Common Stock	⁽¹⁾	09/30/2026		C⁽¹⁾			1,374	⁽¹⁾	⁽¹⁾	Class A Common Stock	1,374	$0	380,783	I	By Spouse
Class B Common Stock	⁽¹⁾	10/01/2026		C⁽¹⁾			3,539	⁽¹⁾	⁽¹⁾	Class A Common Stock	3,539	$0	377,244	I	By Spouse
Class B Common Stock	⁽¹⁾							⁽¹⁾	⁽¹⁾	Class A Common Stock	5,342,146		5,342,146	D

Explanation of Responses:

1. The Class B Common Stock is convertible at any time at the option of the holder into the Issuer's Class A Common Stock on a one-to-one basis. The Class B Common Stock will convert automatically into shares of the Issuer's Class A Common Stock on a one-to-one basis upon the earlier of (a) any transfer of the Class B Common Stock by the holder, whether or not for value, subject to certain exceptions, (b) the death or incapacity of Mr. Skates, (c) the date that is six months following the date on which Mr. Skates is no longer an employee or director of the Issuer (unless Mr. Skates has rejoined the Issuer during such six-month period) or (d) the date that is six months following the date on which none of the Issuer's founders is an employee or director of the Issuer (unless a founder has rejoined the Issuer during such six-month period).

2. The sales reported were effected pursuant to a 10b5-1 trading plan adopted by the Reporting Person's spouse on June 11, 2026.

3. This transaction was executed in multiple trades at prices ranging from $14.4500 to $14.4700. The price reported above reflects the weighted average sale price. The Reporting Person hereby undertakes to provide upon request to the SEC staff, the issuer or a security holder of the issuer full information regarding the number of shares and prices at which the transaction was effected.

	/s/ Elizabeth Fisher, as attorney in fact for Spenser Skates	10/02/2026
	** 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 as rendered by the SEC from accession 0001610717-26-000424.

Amplitude, Inc.

Trade Summary

Price at the Time of the Trade

Company Information

Insider Information

Filing Details

Non-Derivative Transactions

Derivative Transactions

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Footnotes

SEC Form 4

SEC Filing

Price at the Time of the Trade

SEC Form 4