Five9 officer plans sale of 5,114 shares

Officer Tiffany Meriweather has filed a Form 144 to sell 5,114 Five9 shares, after prior 10b5-1 plan sales of 13,409 shares.

Available on EDGAR 09/08/2026 - 04:23 PM EDT Accepted by SEC EDGAR 09/08/2026 - 04:22 PM EDT Learn about SEC filing dates

Rhea-AI Filing Summary

Five9, Inc. (FIVN) is the issuer in a Form 144 notice filed for sales by officer Tiffany Meriweather. The notice covers a proposed sale of 5,114 shares of Five9 common stock through Morgan Stanley Smith Barney LLC on NASDAQ, originating from Restricted Stock Units acquired from the issuer on September 3, 2026.

The filing also reports that, under a Rule 10b5-1 trading plan, 13,409 shares of common stock were sold on September 4, 2026 for aggregate proceeds of $446,630.99.

Key Figures

Proposed shares to be sold: 5,114 shares Prior 3-month sales volume: 13,409 shares Proceeds from prior 3-month sales: $446,630.99 +1 more

4 metrics

Proposed shares to be sold 5,114 shares Common stock covered by the Form 144 notice for Tiffany Meriweather

Prior 3-month sales volume 13,409 shares Shares of Five9 common stock sold on September 4, 2026

Proceeds from prior 3-month sales $446,630.99 Aggregate proceeds from 13,409 shares sold on September 4, 2026

RSU-derived shares 5,114 shares Shares originating from Restricted Stock Units acquired on September 3, 2026

Key Terms

Rule 144, Restricted Stock Units, 10b5-1 Sales, 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.

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 Sales regulatory

"10b5-1 Sales for TIFFANY NICOLE MERIWEATHER"

10b5-1 sales are pre-arranged stock-trading plans that let company insiders automatically buy or sell shares according to a fixed schedule or formula, even if they later learn confidential information. Think of it as setting up an automatic thermostat for trades: it creates a clear, documented path that can protect insiders from insider-trading accusations and gives investors a signal about predictable insider activity—though it can also simply be a way for insiders to diversify or raise cash.

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

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

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

The Form 144 filing discloses that an officer, Tiffany Meriweather, plans to sell 5,114 shares of Five9 common stock under Rule 144, following earlier sales under a 10b5-1 plan. It is a notice of potential resale by an affiliate, not an issuance by Five9.

How many Five9 (FIVN) shares are covered by this Form 144?

The notice covers a proposed sale of 5,114 shares of Five9 common stock. These shares are tied to Restricted Stock Units that were acquired from Five9 on September 3, 2026 and are to be sold through Morgan Stanley Smith Barney LLC on NASDAQ.

What prior sales of Five9 (FIVN) stock are reported in the last 3 months?

The filing reports that, during the past three months, 13,409 shares of Five9 common stock were sold on September 4, 2026 for total proceeds of $446,630.99, identified as 10b5-1 Sales for Tiffany Nicole Meriweather.

Who is the selling security holder in this Five9 (FIVN) Form 144?

The selling security holder is Tiffany Meriweather, identified as an officer of Five9, Inc. The notice states that the securities to be sold are for her account, with RSUs originally issued by Five9 and sales executed through Morgan Stanley Smith Barney LLC.

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

The securities are common stock of Five9, Inc., derived from Restricted Stock Units acquired from the issuer on September 3, 2026. A total of 5,114 shares of common stock are noted as securities to be sold under Rule 144.

Is the Five9 (FIVN) Form 144 sale under a Rule 10b5-1 trading plan?

The proposed sale of 5,114 shares is disclosed in a Rule 144 notice. Separately, the filing specifies that 10b5-1 Sales occurred on September 4, 2026, when 13,409 shares of Five9 common stock were sold for $446,630.99 under a 10b5-1 plan.

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

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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	0001886762
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	TIFFANY MERIWEATHER
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	5114	170142.78	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			5114	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 TIFFANY NICOLE MERIWEATHER 3001 Bishop Drive, Suite 350 San Ramon CA 94583	COMMON	09/04/2026	13409	446630.99

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	05/21/2026
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/ Tiffany N Meriweather
ATTENTION: Intentional misstatements or omission of facts constitute Federal Criminal Violations (See 18 U.S.C. 1001)