Five9 officer plans $488K Rule 144 stock sale

Five9, Inc. (FIVN) received a notice under Rule 144 that officer Bryan Lee plans to sell 14,313 shares of Five9 common stock, which have an aggregate market value of $488,073.30, through Morgan Stanley Smith Barney LLC on NASDAQ.

Rhea-AI Filing Summary

Five9, Inc. (FIVN) received a notice under Rule 144 that officer Bryan Lee plans to sell 14,313 shares of Five9 common stock, which have an aggregate market value of $488,073.30, through Morgan Stanley Smith Barney LLC on NASDAQ. The shares relate to Restricted Stock Units from the issuer, and the notice also lists a prior sale in the last three months.

Key Figures

Planned shares to be sold: 14,313 shares Aggregate market value of planned sale: $488,073.30 Shares sold in past 3 months: 1,511 shares +3 more

6 metrics

Planned shares to be sold 14,313 shares Common stock under Rule 144 for Bryan Lee

Aggregate market value of planned sale $488,073.30 Value of 14,313 Five9 common shares listed in the notice

Shares sold in past 3 months 1,511 shares 10b5-1 sales for Bryan Lee on June 5, 2026

Proceeds from past 3-month sale $36,641.75 Value of 1,511 Five9 common shares sold on June 5, 2026

Planned sale date September 4, 2026 Date associated with planned Rule 144 sale on NASDAQ

Acquisition date of RSU-related shares September 3, 2026 Date tied to Restricted Stock Units from issuer

Key Terms

Rule 144, Restricted Stock Units, 10b5-1

3 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

"Common | 09/03/2026 | Restricted Stock Units | Issuer"

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.

10b5-1 regulatory

"10b5-1 Sales for BRYAN LEE 3001 Bishop Drive"

A 10b5-1 plan is a pre-set schedule that lets company insiders buy or sell shares according to written instructions made when they do not possess material, nonpublic information. Think of it as a timed automatic payment for stock trades: it helps insiders avoid accusations of trading on secret information and gives outside investors a clearer signal about whether sales are routine or potentially informative about the company’s prospects.

FAQ

What does the Form 144 filing disclose for Five9, Inc. (FIVN)?

It discloses that officer Bryan Lee intends to sell 14,313 shares of Five9 common stock under Rule 144, with an aggregate market value of $488,073.30, through Morgan Stanley Smith Barney LLC on NASDAQ.

How many Five9 (FIVN) shares is Bryan Lee planning to sell?

Bryan Lee plans to sell 14,313 shares of Five9 common stock. These shares have an aggregate market value of $488,073.30 according to the notice filed under Rule 144.

What prior sales does the Form 144 report for Five9 (FIVN)?

The notice reports that on June 5, 2026, 1,511 shares of Five9 common stock were sold for $36,641.75 as part of 10b5-1 sales for Bryan Lee.

What type of securities are being sold in the Five9 (FIVN) Form 144?

The securities are common stock of Five9, Inc., related to Restricted Stock Units from the issuer, with a planned sale of 14,313 shares reported in the Rule 144 notice.

Which broker is handling the planned Five9 (FIVN) share sale?

The planned sale of 14,313 shares of Five9 common stock is listed through Morgan Stanley Smith Barney LLC Executive Financial Services, located at 1 New York Plaza, New York, NY, with trading indicated on NASDAQ.

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

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Available on EDGAR 09/04/2026 - 04:38 PM Accepted by SEC EDGAR 09/04/2026 - 04:37 PM 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	14313	488073.30	74723531	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	Restricted Stock Units	Issuer			14313	09/03/2026	N/A

* 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
10b5-1 Sales for BRYAN LEE 3001 Bishop Drive, Suite 350 San Ramon CA 94583	Common	06/05/2026	1511	36641.75

144: Remarks and Signature

Remarks
Date of Notice	09/04/2026
Date of Plan Adoption or Giving of Instruction, If Relying on Rule 10b5-1	09/03/2025
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	/s/ Bryan Lee
ATTENTION: Intentional misstatements or omission of facts constitute Federal Criminal Violations (See 18 U.S.C. 1001)