Amplitude CTO sells 17,586 shares under plan

Amplitude, Inc. director and Chief Technology Officer Curtis Liu reported an open-market sale of 17,586 shares of Class A common stock at a weighted average price of $8.1245 per share on May 4, 2026.

Rhea-AI Filing Summary

Amplitude, Inc. director and Chief Technology Officer Curtis Liu reported an open-market sale of 17,586 shares of Class A common stock at a weighted average price of $8.1245 per share on May 4, 2026. The sale was carried out under a Rule 10b5-1 trading plan adopted on November 26, 2025, indicating it was pre-scheduled. Following this transaction, Liu directly holds 1,067,259 shares of Class A common stock, which includes 986,412 restricted stock units.

Insights

Equity compensation and insider-trading analyst

Pre-planned sale of 17,586 shares; CTO retains over 1.0M shares including RSUs.

Curtis Liu, CTO and director of Amplitude, Inc., executed an open-market sale of 17,586 Class A shares at a weighted average price of $8.1245 on May 4, 2026. The transaction is coded as an S sale in non-derivative stock.

The filing states the sale was made under a Rule 10b5-1 trading plan adopted on November 26, 2025, suggesting the timing was pre-arranged rather than discretionary. After the sale, Liu still directly holds 1,067,259 shares, including 986,412 restricted stock units, indicating a substantial continuing equity position.

Because this is a relatively small, pre-planned sale with significant remaining holdings and no related derivative exercises, it appears to be a routine liquidity event rather than a shift in overall insider exposure. Future company filings may provide additional context on subsequent plan executions.

Insider Trade Summary 10b5-1

Net Seller: 17,586 shares

Net Sell 1 txn

Insider Liu Curtis

Role Chief Technology Officer

Sold 17,586 shs ($143K)

Type	Security	Shares	Price	Value
Sale	Class A Common Stock	17,586	$8.1245	$143K

Holdings After Transaction: Class A Common Stock — 1,067,259 shares (Direct)

Footnotes (3)

1. F1. The sales reported were effected pursuant to a 10b5-1 trading plan adopted by the Reporting Person on November 26, 2025.
2. F2. This transaction was executed in multiple trades at prices ranging from $8.0000 to $8.2200. 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.
3. F3. Includes 986,412 restricted stock units.

Key Figures

Shares sold: 17,586 shares Weighted average sale price: $8.1245 per share Post-transaction holdings: 1,067,259 shares +3 more

6 metrics

Shares sold 17,586 shares Open-market sale of Class A common stock on May 4, 2026

Weighted average sale price $8.1245 per share Class A common stock sale on May 4, 2026

Post-transaction holdings 1,067,259 shares Direct Class A holdings following the sale

Included RSUs 986,412 restricted stock units Portion of post-transaction holdings reported as RSUs

Trade price range $8.0000–$8.2200 per share Price range for individual trade executions

10b5-1 plan adoption date November 26, 2025 Date Curtis Liu adopted the trading plan

Key Terms

Rule 10b5-1 trading plan, restricted stock units, open-market sale, Class A Common Stock, +1 more

5 terms

Rule 10b5-1 trading plan regulatory

"The sales reported were effected pursuant to a 10b5-1 trading plan adopted by the Reporting Person"

A Rule 10b5-1 trading plan is a pre-arranged schedule that allows company insiders to buy or sell stock at specific times, even if they have inside information. It helps prevent accusations of unfair trading by making these transactions look planned and transparent, rather than sneaky or illegal.

restricted stock units financial

"Includes 986,412 restricted stock units."

Restricted stock units are a type of company reward where employees are promised shares of stock, but they only fully own these shares after meeting certain conditions, like staying with the company for a set time. They matter because they can become valuable assets and are often used to motivate employees to help the company succeed.

open-market sale financial

"transaction_action: open-market sale"

An open-market sale is when a shareholder sells existing shares directly on a public exchange to any willing buyer, rather than through a private deal. Think of it like putting goods on a busy market stall where price is set by supply and demand; for investors it matters because such sales increase available supply, can put short-term downward pressure on the stock price, and signal changes in liquidity or investor confidence.

Class A Common Stock financial

"security_title: Class A Common Stock"

Class A common stock is a category of a company’s shares that carries a specific set of ownership rights—most commonly defined voting power and claims on dividends—set out in the company’s charter. For investors it matters because the class determines how much influence you have over corporate decisions, the share’s likely dividend and trading behavior, and how it compares in value to other share classes, like choosing a particular seat with different privileges at the company’s decision-making table.

weighted average sale price financial

"The price reported in Column 4 above reflects the weighted average sale price."

FAQ

What insider transaction did Amplitude (AMPL) report for Curtis Liu?

Amplitude reported that Chief Technology Officer and director Curtis Liu sold 17,586 shares of Class A common stock. The shares were sold in an open-market transaction at a weighted average price of $8.1245 per share on May 4, 2026.

Was the Amplitude (AMPL) insider sale by Curtis Liu made under a 10b5-1 plan?

Yes. The filing notes the sales were effected pursuant to a Rule 10b5-1 trading plan adopted by Curtis Liu on November 26, 2025. Such plans allow insiders to pre-schedule trades, reducing the significance of trade timing as a market signal.

How many Amplitude (AMPL) shares does Curtis Liu hold after this transaction?

After the reported sale, Curtis Liu directly holds 1,067,259 shares of Amplitude Class A common stock. This total includes 986,412 restricted stock units, reflecting a large remaining equity stake tied to the company’s future performance.

What price range were the Amplitude (AMPL) shares sold for in this Form 4?

The transaction was executed in multiple trades at prices ranging from $8.0000 to $8.2200 per share. The Form 4 reports a weighted average sale price of $8.1245 per share for the 17,586 shares sold.

Are restricted stock units included in Curtis Liu’s reported Amplitude (AMPL) holdings?

Yes. A footnote explains that Liu’s post-transaction holding of 1,067,259 shares of Class A common stock includes 986,412 restricted stock units. RSUs typically convert into shares over time, aligning executive compensation with shareholder outcomes.

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Accepted by SEC EDGAR 05/06/2026 - 04:52 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^*

Liu Curtis

(Last) (First) (Middle)

C/O AMPLITUDE, INC.

201 THIRD ST., 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)
	Chief Technology Officer

2a. Foreign Trading Symbol

3. Date of Earliest Transaction (Month/Day/Year)
05/04/2026

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	05/04/2026		S		17,586(1)	D	$8.1245(2)	1,067,259(3)	D

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

Explanation of Responses:

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

2. This transaction was executed in multiple trades at prices ranging from $8.0000 to $8.2200. 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.

3. Includes 986,412 restricted stock units.

Remarks:

	/s/ Elizabeth Fisher, as attorney in fact for Liu Curtis	05/06/2026
	** 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)