Five9 officer may sell 3,932 shares for taxes

Five9, Inc. officer Bryan Lee filed a Form 144 for an issuer-mandated RSU tax-withholding sale of 3,932 shares plus previously reported June sales.

Rhea-AI Filing Summary

Five9, Inc. officer Bryan Lee has filed a Form 144 indicating the potential sale of 3,932 shares of Five9 common stock through Morgan Stanley Smith Barney on Nasdaq, with a proposed sale date of September 4, 2026. The shares relate to RSU vesting, and the filing notes the sale is issuer-mandated to cover tax withholding obligations rather than a discretionary trade. Over the prior three months, Bryan Lee reported sales of 16,620 shares on June 4, 2026 for $412,417.62 and 1,511 shares on June 5, 2026 for $36,641.75.

Key Figures

Shares proposed to be sold: 3,932 shares Proceeds from June 4, 2026 sale: $412,417.62 Shares sold June 4, 2026: 16,620 shares +3 more

6 metrics

Shares proposed to be sold 3,932 shares Five9 common stock under Form 144, proposed sale date September 4, 2026

Proceeds from June 4, 2026 sale $412,417.62 Sale of 16,620 shares of Five9 common stock on June 4, 2026

Shares sold June 4, 2026 16,620 shares Common stock of Five9 sold by Bryan Lee

Proceeds from June 5, 2026 sale $36,641.75 Sale of 1,511 shares of Five9 common stock on June 5, 2026

Shares sold June 5, 2026 1,511 shares Common stock of Five9 sold by Bryan Lee

Date of Notice September 3, 2026 Form 144 notice date for proposed sale of 3,932 shares

Key Terms

Rule 144, Restricted Stock Units, issuer-mandated sale, Nasdaq

4 terms

Rule 144 regulatory

"See the definition of "person" in paragraph (a) of Rule 144."

Rule 144 is a U.S. securities regulation that sets conditions under which restricted or insider-held shares can be legally resold to the public, such as required holding periods, availability of public information, limits on how much can be sold at once, and certain filing requirements. For investors it matters because it determines when previously locked-up shares can enter the market — like a release valve that can increase supply, affect share price, and signal insider intent.

Restricted Stock Units financial

"vesting and settlement of Restricted Stock Units, and it does not"

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.

issuer-mandated sale financial

"represents an Issuer mandated sale by the Reporting Person to cover"

Nasdaq market

"09/04/2026 | Nasdaq"

The Nasdaq is a stock exchange where many companies' shares are bought and sold, functioning much like a marketplace for investments. It matters to investors because it provides a platform to buy and sell ownership stakes in companies, helping them track the value of those companies and make informed decisions. As one of the largest and most technology-focused markets, it also reflects trends and developments in the business world.

FAQ

AI-generated questions and answers. How Rhea-AI works. Not financial advice.

What does the Form 144 filing for FIVN disclose about Bryan Lee's planned sale?

The Form 144 reports that Five9, Inc. officer Bryan Lee may sell up to 3,932 shares of Five9 common stock, related to RSU vesting, with a proposed sale date of September 4, 2026 on Nasdaq through Morgan Stanley Smith Barney.

Is Bryan Lee's planned sale of FIVN shares a discretionary trade?

No. The filing states the sale is an issuer-mandated sale by Bryan Lee to cover tax withholding obligations in connection with the vesting and settlement of Restricted Stock Units and does not represent a discretionary trade by him.

How many FIVN shares has Bryan Lee sold in the past three months?

The filing lists sales of 16,620 shares of Five9 common stock on June 4, 2026 and 1,511 shares on June 5, 2026, for proceeds of $412,417.62 and $36,641.75, respectively.

Through which broker will Bryan Lee's FIVN shares potentially be sold?

The Form 144 indicates the 3,932 shares of Five9 common stock are to be sold through Morgan Stanley Smith Barney LLC Executive Financial Services, located at 1 New York Plaza, New York, with trading on Nasdaq.

What type of security is involved in Bryan Lee's Form 144 for FIVN?

The securities involved are common stock of Five9, Inc., associated with the vesting and settlement of Restricted Stock Units (RSUs). The Form 144 covers a potential sale of 3,932 shares for tax withholding purposes.

When was the notice date for Bryan Lee's Form 144 related to FIVN?

The Form 144 lists the Date of Notice as September 3, 2026, with a proposed sale date of September 4, 2026 for the 3,932 shares of Five9 common stock.

AI-generated analysis. How Rhea-AI works. Not financial advice.

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Available on EDGAR 09/03/2026 - 05:01 PM EDT Accepted by SEC EDGAR 09/03/2026 - 04:46 PM EDT Learn about SEC filing dates

Form 144 Filer Information	UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Form 144 NOTICE OF PROPOSED SALE OF SECURITIES PURSUANT TO RULE 144 UNDER THE SECURITIES ACT OF 1933
FORM 144

144: Filer Information

Filer CIK	0002063775
Filer CCC	XXXXXXXX
Is this a LIVE or TEST Filing?	LIVE TEST
Submission Contact Information
Name
Phone
E-Mail Address

144: Issuer Information

Name of Issuer	Five9, Inc.
SEC File Number	001-36383
Address of Issuer	3001 Bishop Drive Suite 350 San Ramon CALIFORNIA 94583
Phone	9252012000
Name of Person for Whose Account the Securities are To Be Sold	Bryan Lee
See the definition of "person" in paragraph (a) of Rule 144. Information is to be given not only as to the person for whose account the securities are to be sold but also as to all other persons included in that definition. In addition, information shall be given as to sales by all persons whose sales are required by paragraph (e) of Rule 144 to be aggregated with sales for the account of the person filing this notice.
Relationship to Issuer	Officer

144: Securities Information

Title of the Class of Securities To Be Sold	Name and Address of the Broker	Number of Shares or Other Units To Be Sold	Aggregate Market Value	Number of Shares or Other Units Outstanding	Approximate Date of Sale	Name the Securities Exchange
Common	Morgan Stanley Smith Barney LLC Executive Financial Services 1 New York Plaza 8th Floor New York NY 10004	3932	132084.18	74904551	09/04/2026	Nasdaq

Furnish the following information with respect to the acquisition of the securities to be sold and with respect to the payment of all or any part of the purchase price or other consideration therefor:

144: Securities To Be Sold

Title of the Class	Date you Acquired	Nature of Acquisition Transaction	Name of Person from Whom Acquired	Is this a Gift?	Date Donor Acquired	Amount of Securities Acquired	Date of Payment	Nature of Payment *
Common	09/03/2026	RSU	Bryan Lee			3932	09/03/2026	Not Applicable

* If the securities were purchased and full payment therefor was not made in cash at the time of purchase, explain in the table or in a note thereto the nature of the consideration given. If the consideration consisted of any note or other obligation, or if payment was made in installments describe the arrangement and state when the note or other obligation was discharged in full or the last installment paid.

Furnish the following information as to all securities of the issuer sold during the past 3 months by the person for whose account the securities are to be sold.

144: Securities Sold During The Past 3 Months

Name and Address of Seller	Title of Securities Sold	Date of Sale	Amount of Securities Sold	Gross Proceeds
Bryan Lee 3001 Bishop Drive Suite 350 San Ramon CA 94583	Common	06/04/2026	16620	412417.62
Bryan Lee 3001 Bishop Drive Suite 350 San Ramon CA 94583	Common	06/05/2026	1511	36641.75

144: Remarks and Signature

Remarks	The sale reported on this Form 144 represents an Issuer mandated sale by the Reporting Person to cover tax withholding obligations in connection with the vesting and settlement of Restricted Stock Units, and it does not represent a discretionary trade by the Reporting Person
Date of Notice	09/03/2026
ATTENTION:
The person for whose account the securities to which this notice relates are to be sold hereby represents by signing this notice that he does not know any material adverse information in regard to the current and prospective operations of the Issuer of the securities to be sold which has not been publicly disclosed. If such person has adopted a written trading plan or given trading instructions to satisfy Rule 10b5-1 under the Exchange Act, by signing the form and indicating the date that the plan was adopted or the instruction given, that person makes such representation as of the plan adoption or instruction date.
Signature	Bryan Lee
ATTENTION: Intentional misstatements or omission of facts constitute Federal Criminal Violations (See 18 U.S.C. 1001)