Curtis Liu - 01 Jun 2026 Form 4/A - Amendment Insider Report for Amplitude, Inc. (AMPL)

Reporting relationship: Chief Technology Officer, Director, 10%+ Owner
Issuer ticker: AMPL
Reported as of: 01 Jun 2026
Net transaction value: -$182,878
SEC form: 4/A - Amendment
Accepted by SEC: 16 Jun 2026, 17:15:11 UTC
Original report date: 03 Jun 2026
Prior SEC filing: 19 May 2026
Source filing: View source filing
Reporting owner signature: /s/ Elizabeth Fisher, as attorney in fact for Curtis Liu

Key filing fact

Curtis Liu filed Form 4/A - Amendment for Amplitude, Inc. (AMPL) on 16 Jun 2026.

Key facts

This page summarizes Curtis Liu's Form 4/A - Amendment filing for Amplitude, Inc. (AMPL).
1 reported transaction and 0 derivative rows are listed below.
Accepted by SEC: 16 Jun 2026, 17:15.

Change

Previous filing in this sequence was filed on 19 May 2026.
Current net transaction value: -$182,878.

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/A - Amendment disclosures.

View source filing

Reporting Owners (1)

CIK 0001883022 Primary reporting owner

Liu Curtis

Relationship: Chief Technology Officer, Director, 10%+ Owner
Address: C/O AMPLITUDE, INC., 201 THIRD STREET, SUITE 200, SAN FRANCISCO
Signature: /s/ Elizabeth Fisher, as attorney in fact for Curtis Liu
Signature date: 16 Jun 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: $182,878
Shares: -22,786
Change %: -2.2%
Price: $8.03
Shares after: 1,004,194
Date: 01 Jun 2026
Ownership: Direct
Footnotes: F1, F2, F3, F4

^* 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 4 footnotes

Footnote F1

The sales reported were effected pursuant to a 10b5-1 trading plan adopted by the Reporting Person on November 26, 2025.

Footnote F2

This Form 4/A is being filed solely to correct the number of shares reported as sold on June 1, 2026 and the total number of shares owned following the transaction. Due to a broker administrative error, 585 fewer shares were sold than were required pursuant to the Reporting Person's Rule 10b5-1 trading plan. The error was corrected through the broker's error account, with the broker crediting the Reporting Person for the additional 585 shares at the applicable June 1, 2026 sale price and absorbing the cost of the correction. No additional open-market sale was effected in connection with the correction.

Footnote F3

This transaction was executed in multiple trades at prices ranging from $8.0000 to $8.0600. 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 F4

Includes 880,520 restricted stock units.