Five9 officer plans sale of 1,253 shares

Form 144 for a Five9 officer covers a proposed sale of 1,253 shares plus earlier 10b5-1 sales disclosed over the prior three months.

Rhea-AI Filing Summary

Five9, Inc. (FIVN) is the issuer for a notice filed on behalf of officer Leena Mansharamani for a proposed sale of 1,253 shares of Five9 common stock. The shares are held through Morgan Stanley Smith Barney LLC Executive Financial Services and relate to Restricted Stock Units with a transaction date of September 3, 2026.

The notice also lists prior Rule 10b5-1 sales over the preceding three months: 2,706 shares of common stock sold on September 4, 2026 for $90,248.35, and 2,658 shares sold on September 3, 2026 for $90,955.43.

Key Figures

Proposed shares to be sold: 1,253 shares Recent 10b5-1 sale on September 4, 2026: 2,706 shares; $90,248.35 Recent 10b5-1 sale on September 3, 2026: 2,658 shares; $90,955.43 +2 more

5 metrics

Proposed shares to be sold 1,253 shares Common stock covered by the Form 144 notice for Leena Mansharamani

Recent 10b5-1 sale on September 4, 2026 2,706 shares; $90,248.35 Common stock sold under a 10b5-1 plan by Leena Mansharamani

Recent 10b5-1 sale on September 3, 2026 2,658 shares; $90,955.43 Common stock sold under a 10b5-1 plan by Leena Mansharamani

Issuer phone number 925-201-2000 Contact phone for Five9, Inc.

Issuer address 3001 Bishop Drive, Suite 350, San Ramon, CA 94583 Principal address of Five9, Inc.

Key Terms

Rule 144, 10b5-1, Restricted Stock Units, Form 144

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.

10b5-1 regulatory

"10b5-1 Sales for LEENA MANSHARAMANI 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.

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.

Form 144 regulatory

"144: Filer Information"

Form 144 is a document that investors must file with the government when they plan to sell a large number of shares of a company's stock. It helps ensure transparency so everyone knows how many shares are being sold and when, which can impact the stock's price.

FAQ

What does the Five9 (FIVN) Form 144 filing by Leena Mansharamani disclose?

It discloses a proposed sale of 1,253 shares of Five9 common stock held via Morgan Stanley Smith Barney LLC Executive Financial Services, relating to Restricted Stock Units dated September 3, 2026, along with recent Rule 10b5-1 sales over the prior three months.

How many Five9 (FIVN) shares are proposed to be sold under this Form 144?

The notice covers a proposed sale of 1,253 shares of Five9 common stock. These shares are associated with Restricted Stock Units and are held through Morgan Stanley Smith Barney LLC Executive Financial Services, with a listed date of September 3, 2026.

What recent 10b5-1 sales of Five9 (FIVN) stock are reported in this Form 144?

The filing lists two Rule 10b5-1 sales by Leena Mansharamani: 2,706 shares of common stock sold on September 4, 2026 for $90,248.35, and 2,658 shares sold on September 3, 2026 for $90,955.43.

Who is the person selling Five9 (FIVN) shares in this Form 144 notice?

The person for whose account the securities are to be sold is Leena Mansharamani, identified as an officer of Five9, Inc. The Form 144 provides her name and indicates that her sales are subject to the aggregation rules under Rule 144.

Which broker is involved in the proposed sale of Five9 (FIVN) shares?

The proposed sale of 1,253 shares of Five9 common stock is linked to Morgan Stanley Smith Barney LLC Executive Financial Services, located at 1 New York Plaza, 8th Floor, New York, NY 10004, as identified in the securities information section.

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

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Available on EDGAR 09/08/2026 - 04:31 PM Accepted by SEC EDGAR 09/08/2026 - 04:30 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	0001846877
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	LEENA MANSHARAMANI
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	1253	41687.31	74723531	09/08/2026	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			1253	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 LEENA MANSHARAMANI 3001 Bishop Drive, Suite 350 San Ramon CA 94583	COMMON	09/04/2026	2706	90248.35
10b5-1 Sales for LEENA MANSHARAMANI 3001 Bishop Drive, Suite 350 San Ramon CA 94583	COMMON	09/03/2026	2658	90955.43

144: Remarks and Signature

Remarks
Date of Notice	09/08/2026
Date of Plan Adoption or Giving of Instruction, If Relying on Rule 10b5-1	06/04/2026
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	/s/ Leena Mansharamani
ATTENTION: Intentional misstatements or omission of facts constitute Federal Criminal Violations (See 18 U.S.C. 1001)