Spenser Skates - 10 Sep 2026 Form 4 Insider Report for Amplitude, Inc. (AMPL)

Reporting relationship: CEO and President, Director, 10%+ Owner
Issuer ticker: AMPL
Reported as of: 10 Sep 2026
Net transaction value: -$2,275,611
SEC form: 4
Accepted by SEC: 14 Sep 2026, 16:59:44 UTC
Prior SEC filing: 18 Aug 2026
Source filing: View source filing
Reporting owner signature: /s/ Elizabeth Fisher, as attorney in fact for Spenser Skates

Key filing fact

Spenser Skates filed Form 4 for Amplitude, Inc. (AMPL) on 14 Sep 2026.

Key facts

This page summarizes Spenser Skates's Form 4 filing for Amplitude, Inc. (AMPL).
3 reported transactions and 2 derivative rows are listed below.
Accepted by SEC: 14 Sep 2026, 16:59.

Change

Previous filing in this sequence was filed on 18 Aug 2026.
Current net transaction value: -$2,275,611.

Research use

This tells you what this filing adds before you inspect full transaction and derivative tables.
You can trace every row back to the original SEC filing document.

Evidence

Filed on Form 4

Ownership activity is grounded in SEC Form 4 disclosures.

View source filing

Reporting Owners (1)

CIK 0001882913 Primary reporting owner

Skates Spenser

Relationship: CEO and President, Director, 10%+ Owner
Address: C/O AMPLITUDE, INC., SAN FRANCISCO
Signature: /s/ Elizabeth Fisher, as attorney in fact for Spenser Skates
Signature date: 14 Sep 2026

Reported non-derivative transactions

Shares, units, or other non-derivative securities reported in this filing.

AMPL transaction

Class A Common Stock

Conversion of derivative security

Transaction value
Shares: +185,000
Change %
Price: $0.000000^*
Shares after: 185,000
Date: 10 Sep 2026
Ownership: By Spouse
Footnotes: F1

AMPL transaction

Class A Common Stock

Sale

Transaction value: $2,275,611
Shares: -185,000
Change %: -100%
Price: $12.30
Shares after: 0
Date: 10 Sep 2026
Ownership: By Spouse
Footnotes: F2, F3

Reported derivative securities

Options, warrants, convertible securities, or similar derivative positions disclosed in the filing.

AMPL transaction Derivative

Class B Common Stock

Conversion of derivative security

Transaction value
Shares: -185,000
Change %: -33%
Price: $0.000000^*
Shares after: 382,157
Date: 10 Sep 2026
Ownership: By Spouse
Underlying class: Class A Common Stock
Underlying amount: 185,000
Exercise price
Footnotes: F1

AMPL holding Derivative

Class B Common Stock

No transaction description listed

Transaction value
Shares
Change %
Price
Shares after: 5,342,146
Date: 10 Sep 2026
Ownership: Direct
Underlying class: Class A Common Stock
Underlying amount: 5,342,146
Exercise price
Footnotes: F1

^* marks a reported price that did not pass the local price check.

Additional SEC filing notes

Filing notes and footnotes

Rule 10b5-1 trading plan

These transactions were reported as open-market trades under a Rule 10b5-1 plan. The plan lets an insider set trading instructions in advance, which can reduce the risk of trading while in possession of material nonpublic information.

Original filing language: transaction made pursuant to a contract, instruction, or written plan intended to satisfy Rule 10b5-1(c).

Explanation of responses 3 footnotes

Footnote 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).

Footnote F2

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

Footnote F3

This transaction was executed in multiple trades at prices ranging from $12.0300 to $12.5100. 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.