Nathaniel Glenn Crook - 04 Sep 2026 Form 4 Insider Report for Amplitude, Inc. (AMPL)

Reporting relationship: Chief Commercial Officer
Issuer ticker: AMPL
Reported as of: 04 Sep 2026
Net transaction value: -$3,897,750
SEC form: 4
Accepted by SEC: 09 Sep 2026, 17:03:52 UTC
Prior SEC filing: 18 Aug 2026
Source filing: View source filing
Reporting owner signature: /s/ Elizabeth Fisher, as attorney in fact for Nathaniel Glenn Crook

Filing notes and source

Key filing fact

Nathaniel Glenn Crook filed Form 4 for Amplitude, Inc. (AMPL) on 09 Sep 2026.

Key facts

This page summarizes Nathaniel Glenn Crook's Form 4 filing for Amplitude, Inc. (AMPL).
1 reported transaction and 0 derivative rows are listed below.
Accepted by SEC: 09 Sep 2026, 17:03.

Change

Previous filing in this sequence was filed on 18 Aug 2026.
Current net transaction value: -$3,897,750.

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 0002121274 Primary reporting owner

Crook Nathaniel Glenn

Relationship: Chief Commercial Officer
Address: 201 THIRD STREET, SAN FRANCISCO
Signature: /s/ Elizabeth Fisher, as attorney in fact for Nathaniel Glenn Crook
Signature date: 09 Sep 2026

Reported non-derivative transactions

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

AMPL transaction

Class A Common Stock

Sale

Transaction value: -$3,897,750
Shares: -300,000
Change %: -16%
Price: $12.99
Shares after: 1,622,696
Date: 04 Sep 2026
Ownership: Direct
Footnotes: F1, F2, F3

^* 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 sales reported were effected pursuant to a 10b5-1 trading plan adopted by the Reporting Person on June 2, 2026.

Footnote F2

This transaction was executed in multiple trades at prices ranging from $12.6150 to $13.5100. The price reported in Column 4 above reflects the weighted average sale price. The Reporting Person hereby undertakes to provide to the Securities and Exchange Commission staff, the Issuer, or a security holder of the Issuer, upon request, full information regarding the number of shares sold at each respective price within the range set forth in this footnote.

Footnote F3

Includes 1,241,362 restricted stock units.