Amplitude CEO's spouse sells 3,539 shares on Oct. 1

The CEO and President’s spouse made both sales under a trading plan adopted on June 11, 2026.

Rhea-AI Filing Summary

Amplitude, Inc. (AMPL) reported that CEO and President Spenser Skates’s spouse converted 1,374 Class B shares into Class A shares and sold them on September 30, 2026, at a weighted average $14.4530 per share. On October 1, 2026, the spouse converted and sold 3,539 Class B shares at $14.4500 per share. Both sales were made under a 10b5-1 trading plan adopted by the spouse on June 11, 2026. Skates directly held 5,342,146 Class B shares as of September 30, 2026; the class is convertible into Class A on a one-to-one basis.

Insider Trade Summary 10b5-1

Exercise and sale activity reported; no spread calculated

Exercise and Sale 7 txns

Insider Skates Spenser

Role CEO and President

Sold 4,913 shs ($71K)

Approx. gross sale proceeds $71K

Type	Security	Shares	Price	Value
Conversion	Class B Common Stock F1	3,539	$0.00	$0.00
Conversion	Class A Common Stock F1	3,539	$0.00	$0.00
Sale	Class A Common Stock F2	3,539	$14.45	$51K
Conversion	Class B Common Stock F1	1,374	$0.00	$0.00
Conversion	Class A Common Stock F1	1,374	$0.00	$0.00
Sale	Class A Common Stock F2, F3	1,374	$14.453	$20K
holding	Class B Common Stock F1	--	--	--

Holdings After Transaction: Class B Common Stock — 377,244 contracts (Indirect, By Spouse); Class A Common Stock — 0 shares (Indirect, By Spouse); Class B Common Stock — 5,342,146 contracts (Direct)

Footnotes (3)

1. 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).
2. F2. The sales reported were effected pursuant to a 10b5-1 trading plan adopted by the Reporting Person's spouse on June 11, 2026.
3. 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.

Key Figures

Class A shares sold: 1,374 shares Weighted average sale price: $14.4530 per share Class A shares sold: 3,539 shares +5 more

8 metrics

Class A shares sold 1,374 shares September 30, 2026

Weighted average sale price $14.4530 per share September 30, 2026

Class A shares sold 3,539 shares October 1, 2026

Sale price $14.4500 per share October 1, 2026

Class B shares converted 1,374 shares Converted into Class A shares on September 30, 2026

Class B shares converted 3,539 shares Converted into Class A shares on October 1, 2026

Direct Class B shares held 5,342,146 shares September 30, 2026

Class B to Class A conversion ratio One-to-one Class B shares are convertible into Class A shares

Key Terms

10b5-1 trading plan, weighted average sale price, one-to-one basis

3 terms

10b5-1 trading plan regulatory

"sales were effected pursuant to a 10b5-1 trading plan"

A 10b5-1 trading plan is a pre-arranged strategy that allows company insiders to buy or sell company stock at set times, regardless of their current knowledge about the company's situation. It acts like a scheduled appointment for trading, helping prevent the appearance of impropriety or insider trading. This plan provides a way for insiders to sell or buy shares in a controlled, transparent manner, offering reassurance to investors about fair trading practices.

weighted average sale price financial

"reflects the weighted average sale price"

one-to-one basis technical

"Class A Common Stock on a one-to-one basis"

FAQ

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

How many AMPL shares did Spenser Skates’s spouse sell, and at what prices?

Spenser Skates’s spouse sold 1,374 Class A shares at a weighted average $14.4530 per share on September 30, 2026, and 3,539 shares at $14.4500 per share on October 1, 2026. Both sales were made under a 10b5-1 trading plan adopted by the spouse on June 11, 2026.

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

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Available on EDGAR 10/02/2026 - 06:44 PM Accepted by SEC EDGAR 10/02/2026 - 06:44 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^*

Skates Spenser

(Last) (First) (Middle)

C/O AMPLITUDE, INC.

201 THIRD STREET, SUITE 200

(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)
	CEO and President

2a. Foreign Trading Symbol

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

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	09/30/2026		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)
				Code	V	(A)	(D)	Date Exercisable	Expiration Date	Title	Amount or Number of Shares
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: SEC 1474 (03-26)