Spenser Skates - 26 Dec 2025 Form 4 Insider Report for Amplitude, Inc. (AMPL)

Reporting relationship: Chief Executive Officer, Director, 10%+ Owner
Issuer ticker: AMPL
Reported as of: 26 Dec 2025
Net transaction value: -$1,200
SEC form: 4
Accepted by SEC: 30 Dec 2025, 18:04:23 UTC
Prior SEC filing: 29 Dec 2025
Next SEC filing: 22 Apr 2026
Source filing: View source filing
Reporting owner signature: /s/ Elizabeth Fisher, as attorney in fact for Skates Spenser

Key filing fact

Spenser Skates filed Form 4 for Amplitude, Inc. (AMPL) on 30 Dec 2025.

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: 30 Dec 2025, 18:04.

Change

Previous filing in this sequence was filed on 29 Dec 2025.
Current net transaction value: -$1,200.

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: Chief Executive Officer, Director, 10%+ Owner
Address: C/O AMPLITUDE, INC., 201 THIRD ST., SUITE 200, SAN FRANCISCO
Signature: /s/ Elizabeth Fisher, as attorney in fact for Skates Spenser
Signature date: 30 Dec 2025

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: $0
Shares: +100
Change %
Price: $0.000000
Shares after: 100
Date: 26 Dec 2025
Ownership: By Spouse
Footnotes: F1

AMPL transaction

Class A Common Stock

Sale

Transaction value: $1,200
Shares: -100
Change %: -100%
Price: $12.00
Shares after: 0
Date: 26 Dec 2025
Ownership: By Spouse
Footnotes: F2

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: $0
Shares: -100
Change %: -0.02%
Price: $0.000000
Shares after: 567,157
Date: 26 Dec 2025
Ownership: By Spouse
Underlying class: Class A Common Stock
Underlying amount: 100
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: 26 Dec 2025
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 2 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 August 8, 2025.