Notice of Proposed Sale · 144

Five9, Inc.

FIVNNASDAQEQUITYCurrent

Notice of Proposed Sale

Filed Sep 3, 2026Accepted Sep 3, 2026, 4:40 PM EDTFiling CIK 1288847Accession 0002000932-26-000013

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Structured filing — 144

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Notice of proposed sale. The proposed amounts below do not establish that a sale occurred.

Proposed-sale notice

Issuer: Five9, Inc
Issuer CIK: 0001288847
SEC file number: 001-36383
Phone: 9252012000
Person for whose account securities are to be sold: Andrew Dignan
Relationships to issuer: Officer
Street: 3001 Bishop Drive
Street (continued): Suite 350
City: San Ramon
State / country code: CA
Postal code: 94583

Securities proposed for sale

Securities proposed for sale · 1 reported row
Security	Proposed units	Aggregate market value	Units outstanding	Approximate sale date	Exchange	Broker / market maker
Common	3,201	107,512.92	74,904,551	09/04/2026	Nasdaq	Morgan Stanley Smith Barney LLC

Broker / market maker — proposed row 1, entry 1

Name: Morgan Stanley Smith Barney LLC
Street: Executive Financial Services
Street (continued): 1 New York Plaza 8th Floor
City: New York
State / country code: NY
Postal code: 10004

Acquisition of securities to be sold

Acquisition of securities to be sold · 1 reported row
Security	Acquired	Nature of acquisition	Acquired from	Amount acquired	Gift transaction	Payment date	Nature of payment
Common	09/03/2026	RSU	Issuer	3,201	N	09/03/2026	Not Applicable

Sales reported in the preceding three months

Sales reported in the preceding three months · 3 reported rows
Seller	Security	Sale date	Amount sold	Gross proceeds
Andrew Dignan	Common	08/28/2026	17,767	622,378.01
Andrew Dignan	Common	06/04/2026	8,203	203,108.58
Andrew Dignan	Common	06/05/2026	3,073	74,520.25

Seller — prior-sale row 1, entry 1

Name: Andrew Dignan
Street: 3001 Bishop Dr.
Street (continued): Suite 350
City: San Ramon
State / country code: CA
Postal code: 94583

Seller — prior-sale row 2, entry 1

Name: Andrew Dignan
Street: 3001 Bishop Dr.
Street (continued): Suite 350
City: San Ramon
State / country code: CA
Postal code: 94583

Seller — prior-sale row 3, entry 1

Name: Andrew Dignan
Street: 3001 Bishop Dr.
Street (continued): Suite 350
City: San Ramon
State / country code: CA
Postal code: 94583

Prior-sale reporting

Nothing to report for the preceding three months: N

Remarks

The sale reported on this Form 144 represents an Issuer mandated sale by the Reporting Person to cover tax withholding obligations in connection with the vesting and settlement of Restricted Stock Units, and it does not represent a discretionary trade by the Reporting Person.

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