Five9 CFO sells 20,618 shares in plan trades

Five9’s CFO executed pre-planned and largely tax-related open-market sales totaling 20,618 common shares.

Rhea-AI Filing Summary

Five9, Inc. (FIVN) reported that Chief Financial Officer Bryan M. Lee sold an aggregate 20,618 shares of common stock in four open-market transactions on September 4 and September 8, 2026. The transactions were effected under a Rule 10b5-1 trading plan adopted on September 3, 2025, and certain September 4 sales were made to cover taxes upon the vesting of restricted stock units, including trades executed under Five9’s previously established sell-to-cover withholding policy.

Insider Trade Summary 10b5-1

Net Seller: 20,618 shares

Net Sell 4 txns

Insider Lee Bryan M

Role Chief Financial Officer

Sold 20,618 shs ($687K)

Type	Security	Shares	Price	Value
Sale	Common Stock F1	1,310	$32.60	$43K
Sale	Common Stock F1, F2, F3	6,500	$33.05	$215K
Sale	Common Stock F1, F2, F4	7,813	$33.52	$262K
Sale	Common Stock F5, F6	4,995	$33.45	$167K

Holdings After Transaction: Common Stock — 289,333 shares (Direct)

Footnotes (6)

1. F1. The sales reported in this Form 4 were effected pursuant to a Rule 10b5-1 trading plan adopted by the reporting person on September 3, 2025.
2. F2. The reported sales were to cover taxes upon the vesting of restricted stock units.
3. F3. The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $32.35 to $33.35, inclusive. The reporting person undertakes to provide Five9, Inc., any security holder of Five9, Inc., or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price within the ranges set forth in this footnote.
4. F4. The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $33.36 to $33.75, inclusive. The reporting person undertakes to provide Five9, Inc., any security holder of Five9, Inc., or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price within the ranges set forth in this footnote.
5. F5. The reported sales were to cover taxes upon the vesting of restricted stock units. The sales reported in this Form 4 were effected in accordance with Five9, Inc.s previously established sell to cover withholding policy, the Corporations Policy.
6. F6. The price reported in Column 4 is a weighted average price applied to the transaction by the broker under the Corporations Policy for sales to cover taxes upon vesting of restricted stock units for all individuals, including the reporting person subject to the Corporations Policy on the date such sales occurred. The reporting person undertakes to provide Five9, Inc., any security holder of Five9, Inc., or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price.

Key Figures

Total shares sold: 20,618 shares September 4, 2026 sale 1: 6,500 shares at $33.05 per share September 4, 2026 sale 2: 7,813 shares at $33.52 per share +4 more

7 metrics

Total shares sold 20,618 shares Aggregate sales reported for September 4 and 8, 2026

September 4, 2026 sale 1 6,500 shares at $33.05 per share Open-market sale of common stock

September 4, 2026 sale 2 7,813 shares at $33.52 per share Open-market sale of common stock

September 4, 2026 sale 3 4,995 shares at $33.45 per share Open-market sale of common stock

September 8, 2026 sale 1,310 shares at $32.60 per share Open-market sale of common stock

Rule 10b5-1 plan adoption date September 3, 2025 Plan governing the reported sales

Net buy/sell direction Net sale of 20,618 shares No purchases or derivative exercises reported

Key Terms

Rule 10b5-1 trading plan, restricted stock units, weighted average price, sell to cover withholding policy

4 terms

Rule 10b5-1 trading plan regulatory

"sales reported in this Form 4 were effected pursuant to a Rule 10b5-1 trading plan"

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

"reported sales were to cover taxes upon the vesting of 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.

weighted average price financial

"The price reported in Column 4 is a weighted average price"

Weighted average price is the average price of a security where each trade or component is counted according to its size, so bigger trades pull the average more than smaller ones. Think of it like calculating the average cost of a grocery haul where items you bought more of have greater influence on the final per-item cost. Investors use it to understand the true average price paid or received, judge execution quality, and compare trading performance against market movement.

sell to cover withholding policy financial

"sales reported in this Form 4 were effected in accordance with Five9, Inc.s previously established sell to cover withholding policy"

FAQ

What did Five9 (FIVN) disclose about the CFO’s recent stock sales?

Five9 disclosed that its CFO, Bryan M. Lee, sold 20,618 shares of common stock in four open-market transactions on September 4 and 8, 2026, under a Rule 10b5-1 trading plan, with certain sales made to cover taxes on vested restricted stock units.

How many Five9 (FIVN) shares did the CFO sell in each reported transaction?

Bryan M. Lee sold 6,500 shares at $33.05, 7,813 shares at $33.52, and 4,995 shares at $33.45 on September 4, 2026, and 1,310 shares at $32.60 on September 8, 2026, all reported as open-market sales of common stock.

Were the Five9 (FIVN) CFO’s stock sales made under a Rule 10b5-1 plan?

Yes. The filing states the sales were effected pursuant to a Rule 10b5-1 trading plan adopted by Bryan M. Lee on September 3, 2025. The Form 4 also affirms the Rule 10b5-1 plan status at the document level.

Why were some of the Five9 (FIVN) CFO’s shares sold according to the Form 4?

The Form 4 states that certain reported sales on September 4, 2026 were made to cover taxes upon the vesting of restricted stock units, including sales executed under Five9’s previously established sell to cover withholding policy for such vestings.

What pricing detail does Five9 (FIVN) provide for the CFO’s September 4, 2026 stock sales?

For two September 4 transactions, the Form 4 notes the reported prices are weighted average prices: shares were sold in multiple trades ranging from $32.35 to $33.35 and from $33.36 to $33.75. The CFO undertakes to provide full price-breakdown details upon request.

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Available on EDGAR 09/09/2026 - 04:18 PM Accepted by SEC EDGAR 09/09/2026 - 04:17 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^*

Lee Bryan M

(Last) (First) (Middle)

C/O FIVE9, INC.

3001 BISHOP DR. SUITE #350

(Street)

SAN RAMON CALIFORNIA 94583

(City) (State) (Zip)

UNITED STATES

(Country)

2. Issuer Name and Ticker or Trading Symbol
Five9, Inc. [ FIVN ]

5. Relationship of Reporting Person(s) to Issuer
(Check all applicable)

	Director		10% Owner
X	Officer (give title below)		Other (specify below)
	Chief Financial Officer

2a. Foreign Trading Symbol

3. Date of Earliest Transaction (Month/Day/Year)
09/04/2026

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
Common Stock	09/04/2026		S		6,500(1)(2)	D	$33.05(3)	303,451	D
Common Stock	09/04/2026		S		7,813(1)(2)	D	$33.52(4)	295,638	D
Common Stock	09/04/2026		S		4,995(5)	D	$33.45(6)	290,643	D
Common Stock	09/08/2026		S		1,310(1)	D	$32.6	289,333	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 in this Form 4 were effected pursuant to a Rule 10b5-1 trading plan adopted by the reporting person on September 3, 2025.

2. The reported sales were to cover taxes upon the vesting of restricted stock units.

3. The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $32.35 to $33.35, inclusive. The reporting person undertakes to provide Five9, Inc., any security holder of Five9, Inc., or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price within the ranges set forth in this footnote.

4. The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $33.36 to $33.75, inclusive. The reporting person undertakes to provide Five9, Inc., any security holder of Five9, Inc., or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price within the ranges set forth in this footnote.

5. The reported sales were to cover taxes upon the vesting of restricted stock units. The sales reported in this Form 4 were effected in accordance with Five9, Inc.s previously established sell to cover withholding policy, the Corporations Policy.

6. The price reported in Column 4 is a weighted average price applied to the transaction by the broker under the Corporations Policy for sales to cover taxes upon vesting of restricted stock units for all individuals, including the reporting person subject to the Corporations Policy on the date such sales occurred. The reporting person undertakes to provide Five9, Inc., any security holder of Five9, Inc., or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price.

Remarks:

	/s/ Tiffany Meriweather, Attorney in Fact	09/09/2026
	** 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)