As filed with the Securities and Exchange Commission on February 21, 2024

Registration No. 333-

UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

FORM S-8

REGISTRATION STATEMENT

UNDER THE SECURITIES ACT OF 1933

FIVE9, INC. (Exact name of registrant as specified in its charter)
Delaware (State or other jurisdiction of incorporation or organization)			94-3394123 (I.R.S. Employer Identification No.)
	3001 Bishop Drive, Suite 350 San Ramon, California 94583 (925) 201-2000 (Address of Principal Executive Offices, Including Zip Code)
		2014 Equity Incentive Plan 2014 Employee Stock Purchase Plan (Full title of the plan)
		Barry Zwarenstein Chief Financial Officer Five9, Inc. 3001 Bishop Drive, Suite 350 San Ramon, CA 94583 (Name and address of agent for service)
		(925) 201-2000 (Telephone number, including area code, of agent for service)

Indicate by check mark whether the registrant is a large accelerated filer, an accelerated filer, a non-accelerated filer, a smaller reporting company or an emerging growth company. See the definitions of “large accelerated filer,” “accelerated filer,” “smaller reporting company,” and “emerging growth company” in Rule 12b-2 of the Exchange Act.

Large accelerated filer x	Accelerated filer o
Non-accelerated filer o (Do not check if a smaller reporting company)	Smaller reporting company o
	Emerging growth company o

If an emerging growth company, indicate by check mark if the registrant has elected not to use the extended transition period for complying with any new or revised financial accounting standards provided pursuant to Section 7(a)(2)(B) of the Securities Act. o

Registration of Additional Securities

Pursuant to General Instruction E

    This Registration Statement registers 4,399,017 additional shares of common stock of Five9, Inc. (the “Registrant”) to be issued pursuant to the 2014 Equity Incentive Plan and the 2014 Employee Stock Purchase Plan. Accordingly, the Registrant incorporates by reference the contents of the Registration Statement on Form S-8 (File No. 333-195037) filed by the Registrant with the Securities and Exchange Commission (“SEC”) on April 4, 2014, the Registration Statement on Form S-8 (File No. 333-204145) filed by the Registrant with the SEC on May 13, 2015, the Registration Statement on Form S-8 (File No. 333-209918) filed by the Registrant with the SEC on March 4, 2016, the Registration Statement on Form S-8 (File No. 333-216332) filed by the Registrant with the SEC on February 28, 2017, the Registration Statement on Form S-8 (File No. 333-223362) filed with the SEC on March 1, 2018, the Registration Statement on Form S-8 (File No. 333-229845) filed with the SEC on February 25, 2019, the Registration Statement on Form S-8 (File No. 333-236723) filed with the SEC on February 27, 2020, the Registration Statement on Form S-8 (File No. 333-253672) filed with the SEC on March 1, 2021, the Registration Statement on Form S-8 (File No. 333-236103) filed with the SEC on February 28, 2022, and the Registration Statement on Form S-8 (File No. 333-269999) filed with the SEC on February 24, 2023.

PART II

INFORMATION REQUIRED IN THE REGISTRATION STATEMENT

Item 3. Incorporation of Documents by Reference.

    The following documents filed by the Registrant with the SEC are incorporated herein by reference:

    (a)    the Registrant’s Annual Report on Form 10-K for the year ended December 31, 2023, filed with the SEC on February 21, 2024;

    (b)    the Registrant’s Current Report on Form 8-K filed with the SEC on February 21, 2024 (only Item 8.01) (excluding any information furnished pursuant to Item 2.02 or Item 7.01 on any Current Report on Form 8-K); and

    (c)    the description of the Registrant’s common stock contained in the Registrant’s Registration Statement on Form 8-A (File No. 001-36383) filed with the SEC on March 28, 2014, pursuant to Section 12(b) of the Exchange Act, as updated by the description of the Registrant’s common stock contained in Exhibit 4.2 to the Registrant’s Annual Report on Form 10-K for the year ended December 31, 2019, including any amendment or report filed for the purpose of updating such description.

    All documents filed by the Registrant with the SEC pursuant to Sections 13(a), 13(c), 14 and 15(d) of the Exchange Act (excluding any information furnished pursuant to Item 2.02 or Item 7.01 on any current report on Form 8-K) subsequent to the date of this Registration Statement and prior to the filing of a post-effective amendment that indicates that all securities offered have been sold or which deregisters all securities then remaining unsold, will be deemed to be incorporated by reference in this Registration Statement and to be part hereof from the date of filing of such documents. Any statement contained in any document incorporated or deemed to be incorporated by reference herein will be deemed to be modified or superseded for purposes of this Registration Statement to the extent that a statement contained herein or in any other subsequently filed document which also is or is deemed to be incorporated by reference herein modifies or supersedes such statement. Any such statement so modified or superseded will not be deemed, except as modified or superseded, to constitute a part of this Registration Statement.

Item 8. Exhibits

Exhibit Number	Description	Filed Herewith
4.1	Amended and Restated Certificate of Incorporation of Five9, Inc. (filed as Exhibit 3.2 to the Company’s Current Report on Form 8-K filed with the SEC on April 10, 2014 (File No. 001-36383) and incorporated by reference herein)
4.2	Amended and Restated Bylaws of Five9, Inc. (filed as Exhibit 3.1 to the Company's Quarterly Report on Form 10-Q filed with the SEC on November 2, 2023 (File No. 001-36383) and incorporated by reference herein)
4.3	Five9, Inc. 2014 Equity Incentive Plan and related form agreements (filed as Exhibit 10.9 to Amendment No.1 to the Company’s Registration Statement on Form S-1 filed with the SEC on March 24, 2014 (File No. 333-194258) and incorporated by reference herein)
4.4	Five9, Inc. 2014 Employee Stock Purchase Plan (filed as Exhibit 10.10 to Amendment No.1 to the Company’s Registration Statement on Form S-1 filed with the SEC on March 24, 2014 (File No. 333-194258) and incorporated by reference herein).
4.5	Five9 Inc. Performance-Based Restricted Stock Unit Grant Notice and Award Agreement - 2014 Equity Incentive Plan (filed as Exhibit 10.19 to the Company’s Annual Report on Form 10-K filed with the SEC on February 28, 2022 (File No. 001-36383) and incorporated by reference herein).
4.6	Form of Five9 Inc. Restricted Stock Unit Grant Notice and Award Agreement - 2014 Equity Incentive Plan (filed as Exhibit 10.20 to the Company’s Annual Report on Form 10-K filed with the SEC on February 28, 2022 (File No. 001-36383) and incorporated by reference herein).
4.7	Form of Five9 Inc. Stock Option Grant Notice and Award Agreement - 2014 Equity Incentive Plan (filed as Exhibit 10.21 to the Company’s Annual Report on Form 10-K filed with the SEC on February 28, 2022 (File No. 001-36383) and incorporated by reference herein).
4.8	Five9, Inc. Form of Performance-Based Restricted Stock Unit Grant Notice and Award Agreement (Revenue Goals) - 2014 Equity Incentive Plan (filed as Exhibit 10.1 to the Company’s Quarterly Report on Form 10-Q filed with the SEC on July 28, 2022 (File No. 001-36383) and incorporated by reference herein).
4.9	Five9, Inc. Performance-Based Restricted Stock Unit Grant Notice and Award Agreement for 2023-2025 Performance Period - 2014 Equity Incentive Plan (filed as Exhibit 10.21 to the Company’s Annual Report on Form 10-K filed with the SEC on February 24, 2023 (File No. 001-36383) and incorporated by reference herein).
4.10	Five9, Inc. Performance-Based Restricted Stock Unit Grant Notice and Award Agreement for 2024-2026 Performance Period - 2014 Equity Incentive Plan
5.1	Opinion of Jones Day	X
23.1	Consent of KPMG LLP, independent registered public accounting firm.	X
23.2	Consent of Jones Day (included in Exhibit 5.1)	X
24.1	Power of Attorney (included on the signature page of this Registration Statement).	X
107*	Filing Fee Table

SIGNATURES

    Pursuant to the requirements of the Securities Act of 1933, the Registrant certifies that it has reasonable grounds to believe that it meets all of the requirements for filing on Form S-8 and has duly caused this registration statement to be signed on its behalf by the undersigned, thereunto duly authorized, in the City of San Ramon, State of California, on February 21, 2024.

	Five9, Inc.
By:	/s/ Michael Burkland
	Michael Burkland
	Chief Executive Officer

POWER OF ATTORNEY

    KNOW ALL PERSONS BY THESE PRESENTS, that each person whose signature appears below constitutes and appoints Michael Burkland and Barry Zwarenstein, and each of them, severally, as his or her true and lawful attorneys-in-fact and agents with the power to act, with or without the other, with full power of substitution and resubstitution, for him or her and in his or her name, place and stead, in his or her capacity as a director or officer or both, as the case may be, of the Company, to sign any and all amendments to this Registration Statement on Form S-8, and to file the same, with exhibits thereto and other documents in connection therewith, with the Securities and Exchange Commission, hereby ratifying and confirming all that each of said attorneys-in-fact and agents, or his substitute or substitutes, may lawfully do or cause to be done by virtue hereof.

    Pursuant to the requirements of the Securities Act of 1933, this registration statement has been signed by the following persons in the capacities and on the date indicated:

Signature	Title	Date
/s/ Michael Burkland	Chief Executive Officer, Director	February 21, 2024
Michael Burkland	(Principal Executive Officer)
/s/ Barry Zwarenstein	Chief Financial Officer	February 21, 2024
Barry Zwarenstein	(Principal Financial Officer)
/s/ Leena Mansharamani	Chief Accounting Officer	February 21, 2024
Leena Mansharamani	(Principal Accounting Officer)
/s/ Jack Acosta	Director	February 21, 2024
Jack Acosta
/s/ Susan Barsamian	Director	February 21, 2024
Susan Barsamian
/s/ Michael Burdiek	Director	February 21, 2024
Michael Burdiek
/s/ David DeWalt	Director	February 21, 2024
David DeWalt
/s/ Julie Iskow	Director	February 21, 2024
Julie Iskow
/s/ Jonathan Mariner	Director	February 21, 2024
Jonathan Mariner
/s/ David Welsh	Director, Lead Independent Director	February 21, 2024
David Welsh
/s/ Robert Zollars	Director	February 21, 2024
Robert Zollars