Kozanian Panos

SEC source: 0001940974-26-000009 · wk-form4_1780954211.xml · nonDerivative · entry 1

Kozanian Panos · CIK 0001940974 · EVP, Product Engineering

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 161,671

F1 · shares: The sale reported on this form represents a Five9, Inc. 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.

F2 · price: The price reported in Column 4 is a weighted average price applied to the transaction by the broker for sales to cover taxes upon vesting of restricted stock units for all employees of Five9, Inc., including the Reporting Person, 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.

SEC source: 0001940974-26-000004 · wk-form4_1772831371.xml · nonDerivative · entry 2

Kozanian Panos · CIK 0001940974 · EVP, Product Engineering

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 167,540

F1 · shares: The sales reported in this Form 4 were effected pursuant to a Rule 10b5-1 trading plan adopted by the reporting person on May 14, 2025.

F4 · price: The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $17.92 to $18.07, 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.

SEC source: 0001940974-26-000004 · wk-form4_1772831371.xml · nonDerivative · entry 1

Kozanian Panos · CIK 0001940974 · EVP, Product Engineering

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 174,542

F1 · shares: The sales reported in this Form 4 were effected pursuant to a Rule 10b5-1 trading plan adopted by the reporting person on May 14, 2025.

F2 · shares: The reported sales were to cover taxes upon the vesting of restricted stock units.

F3 · price: The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $17.49 to $17.92, 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.

SEC source: 0001940974-26-000002 · wk-form4_1772140486.xml · nonDerivative · entry 1

Kozanian Panos · CIK 0001940974 · EVP, Product Engineering

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 178,402

SEC source: 0001940974-25-000004 · wk-form4_1764974308.xml · nonDerivative · entry 2

Kozanian Panos · CIK 0001940974 · EVP, Product Engineering

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 94,457

F1 · shares: The sales reported in this Form 4 were effected pursuant to a Rule 10b5-1 trading plan adopted by the reporting person on May 14, 2025.

F4 · price: The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $20.47 to $20.73, 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.

SEC source: 0001940974-25-000004 · wk-form4_1764974308.xml · nonDerivative · entry 1

Kozanian Panos · CIK 0001940974 · EVP, Product Engineering

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 99,774

F1 · shares: The sales reported in this Form 4 were effected pursuant to a Rule 10b5-1 trading plan adopted by the reporting person on May 14, 2025.

F2 · shares: The reported sales were to cover taxes upon the vesting of restricted stock units.

F3 · price: The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $20.13 to $20.47, 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.

SEC source: 0001940974-25-000003 · wk-form4_1757370322.xml · nonDerivative · entry 2

Kozanian Panos · CIK 0001940974 · EVP, Product Engineering

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 105,315

F1 · shares: The sales reported in this Form 4 were effected pursuant to a Rule 10b5-1 trading plan adopted by the reporting person on May 14, 2025.

F3 · price: The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $25.92 to $26.34 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.

SEC source: 0001940974-25-000003 · wk-form4_1757370322.xml · nonDerivative · entry 1

Kozanian Panos · CIK 0001940974 · EVP, Product Engineering

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 111,748

F1 · shares: The sales reported in this Form 4 were effected pursuant to a Rule 10b5-1 trading plan adopted by the reporting person on May 14, 2025.

F2 · price: The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $25.13 to $25.92, 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.

SEC source: 0001288847-25-000189 · wk-form4_1755292176.xml · nonDerivative · entry 2

Kozanian Panos · CIK 0001940974 · EVP, Product Engineering

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 116,175

F1 · shares: The sales reported in this Form 4 were effected pursuant to a Rule 10b5-1 trading plan adopted by the reporting person on May 14, 2025.

F3 · price: The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $25.74 to $26.20, 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.

SEC source: 0001288847-25-000189 · wk-form4_1755292176.xml · nonDerivative · entry 1

Kozanian Panos · CIK 0001940974 · EVP, Product Engineering

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 121,318

F1 · shares: The sales reported in this Form 4 were effected pursuant to a Rule 10b5-1 trading plan adopted by the reporting person on May 14, 2025.

F2 · price: The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $24.74 to $25.73, 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.

SEC source: 0001288847-25-000159 · wk-form4_1749243875.xml · nonDerivative · entry 1

Kozanian Panos · CIK 0001940974 · EVP, Product Engineering

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 123,218

F1 · shares: The sale reported on this form represents a Five9, Inc. 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.

F2 · price: The price reported in Column 4 is a weighted average price applied to the transaction by the broker for sales to cover taxes upon vesting of restricted stock units for all employees of Five9, Inc., including the Reporting Person, 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.

F3 · balance_after: Includes 675 shares acquired under the Five9, Inc. Employee Stock Purchase Plan on May 15, 2025.

SEC source: 0001288847-25-000037 · wk-form4_1741134901.xml · nonDerivative · entry 2

Kozanian Panos · CIK 0001940974 · EVP, Product Engineering

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 126,359

F1 · shares: The sales reported in this Form 4 were effected pursuant to a Rule 10b5-1 trading plan adopted by the reporting person on Mach 13, 2024.

F4 · price: The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $33.30 to $34.10, 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.

SEC source: 0001288847-25-000037 · wk-form4_1741134901.xml · nonDerivative · entry 1

Kozanian Panos · CIK 0001940974 · EVP, Product Engineering

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 131,124

F1 · shares: The sales reported in this Form 4 were effected pursuant to a Rule 10b5-1 trading plan adopted by the reporting person on Mach 13, 2024.

F2 · shares: The reported sales were to cover taxes upon the vesting of restricted stock units.

F3 · price: The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $32.64 to $33.30, 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.

SEC source: 0001288847-25-000035 · wk-form4_1740693094.xml · nonDerivative · entry 1

Kozanian Panos · CIK 0001940974 · EVP, Product Engineering

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 133,978

SEC source: 0001288847-24-000165 · wk-form4_1733523404.xml · nonDerivative · entry 3

Kozanian Panos · CIK 0001940974 · EVP, Product Engineering

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 69,009

F2 · shares: The sales reported in this Form 4 were effected pursuant to a Rule 10b5-1 trading plan adopted by the reporting person on March 13, 2024.

F5 · price: The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $42.22 to $42.81, 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.

SEC source: 0001288847-24-000165 · wk-form4_1733523404.xml · nonDerivative · entry 2

Kozanian Panos · CIK 0001940974 · EVP, Product Engineering

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 72,818

F1 · shares: The reported sales were to cover taxes upon the vesting of restricted stock units.

F2 · shares: The sales reported in this Form 4 were effected pursuant to a Rule 10b5-1 trading plan adopted by the reporting person on March 13, 2024.

F4 · price: The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $42.11 to $42.22, 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.

SEC source: 0001288847-24-000165 · wk-form4_1733523404.xml · nonDerivative · entry 1

Kozanian Panos · CIK 0001940974 · EVP, Product Engineering

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 73,628

F1 · shares: The reported sales were to cover taxes upon the vesting of restricted stock units.

F2 · shares: The sales reported in this Form 4 were effected pursuant to a Rule 10b5-1 trading plan adopted by the reporting person on March 13, 2024.

F3 · price: The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $41.10 to $42.08, 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.

SEC source: 0001288847-24-000134 · wk-form4_1725656443.xml · nonDerivative · entry 2

Kozanian Panos · CIK 0001940974 · EVP, Product Engineering

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 76,628

F2 · shares: The sales reported in this Form 4 were effected pursuant to a Rule 10b5-1 trading plan adopted by the reporting person on March 13, 2024.

F4 · price: The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $30.18 to $30.66, 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.

SEC source: 0001288847-24-000134 · wk-form4_1725656443.xml · nonDerivative · entry 1

Kozanian Panos · CIK 0001940974 · EVP, Product Engineering

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 80,258

F1 · shares: The reported sales were to cover taxes upon the vesting of restricted stock units.

F2 · shares: The sales reported in this Form 4 were effected pursuant to a Rule 10b5-1 trading plan adopted by the reporting person on March 13, 2024.

F3 · price: The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $29.66 to $30.18, 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.

SEC source: 0001288847-24-000095 · wk-form4_1718396398.xml · nonDerivative · entry 2

Kozanian Panos · CIK 0001940974 · EVP, Product Engineering

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 84,245

F1 · shares: The sales reported in this Form 4 were effected pursuant to a Rule 10b5-1 trading plan adopted by the reporting person on March 13, 2024.

F3 · price: The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $44.59 to $45.47, 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.

SEC source: 0001288847-24-000095 · wk-form4_1718396398.xml · nonDerivative · entry 1

Kozanian Panos · CIK 0001940974 · EVP, Product Engineering

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 90,437

F1 · shares: The sales reported in this Form 4 were effected pursuant to a Rule 10b5-1 trading plan adopted by the reporting person on March 13, 2024.

F2 · price: The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $43.58 to $44.58, 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.

SEC source: 0001288847-24-000088 · wk-form4_1717705652.xml · nonDerivative · entry 1

Kozanian Panos · CIK 0001940974 · EVP, Product Engineering

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 94,477

F1 · shares: 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.

F2 · price: 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.

F3 · balance_after: Includes 344 shares acquired under the Five9, Inc. Employee Stock Purchase Plan on May 15, 2024.

SEC source: 0001288847-24-000022 · wk-form4_1709762535.xml · nonDerivative · entry 6

Kozanian Panos · CIK 0001940974 · EVP, Product Engineering

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 101,026

F1 · shares: The reported sales were to cover taxes upon the vesting of restricted stock units.

F8 · price: The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $59.00 to $59.22 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.

SEC source: 0001288847-24-000022 · wk-form4_1709762535.xml · nonDerivative · entry 5

Kozanian Panos · CIK 0001940974 · EVP, Product Engineering

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 101,897

F7 · shares: The reported sales were to cover taxes upon the vesting of performance-based RSUs.

SEC source: 0001288847-24-000022 · wk-form4_1709762535.xml · nonDerivative · entry 4

Kozanian Panos · CIK 0001940974 · EVP, Product Engineering

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 103,324

F6 · shares: Settlement of non-derivative performance-based RSUs

SEC source: 0001288847-24-000022 · wk-form4_1709762535.xml · nonDerivative · entry 3

Kozanian Panos · CIK 0001940974 · EVP, Product Engineering

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 99,625

F2 · shares: The sales reported in this Form 4 were effected pursuant to a Rule 10b5-1 trading plan adopted by the reporting person on December 14, 2022.

F5 · price: The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $60.40 to $61.11 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.

SEC source: 0001288847-24-000022 · wk-form4_1709762535.xml · nonDerivative · entry 2

Kozanian Panos · CIK 0001940974 · EVP, Product Engineering

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 105,305

F1 · shares: The reported sales were to cover taxes upon the vesting of restricted stock units.

F2 · shares: The sales reported in this Form 4 were effected pursuant to a Rule 10b5-1 trading plan adopted by the reporting person on December 14, 2022.

F4 · price: The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $60.29 to $60.40, 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.

SEC source: 0001288847-24-000022 · wk-form4_1709762535.xml · nonDerivative · entry 1

Kozanian Panos · CIK 0001940974 · EVP, Product Engineering

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 107,319

F1 · shares: The reported sales were to cover taxes upon the vesting of restricted stock units.

F2 · shares: The sales reported in this Form 4 were effected pursuant to a Rule 10b5-1 trading plan adopted by the reporting person on December 14, 2022.

F3 · price: The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $59.27 to $60.26, 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.

SEC source: 0001288847-24-000016 · wk-form4_1709155945.xml · nonDerivative · entry 1

Kozanian Panos · CIK 0001940974 · EVP, Product Engineering

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 108,619

SEC source: 0001288847-23-000170 · wk-form4_1702071897.xml · nonDerivative · entry 1

Kozanian Panos · CIK 0001940974 · EVP, Product Engineering

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 72,935

F1 · shares: Shares withheld by the Issuer to satisfy tax withholding obligation due to the vesting of Restricted Stock Units ("RSUs").

SEC source: 0001288847-23-000166 · wk-form4_1701897589.xml · nonDerivative · entry 9

Kozanian Panos · CIK 0001940974 · EVP, Product Engineering

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 74,051

F2 · shares: The sales reported in this Form 4 were effected pursuant to a Rule 10b5-1 trading plan adopted by the reporting person on December 14, 2022.

SEC source: 0001288847-23-000166 · wk-form4_1701897589.xml · nonDerivative · entry 8

Kozanian Panos · CIK 0001940974 · EVP, Product Engineering

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 74,151

F2 · shares: The sales reported in this Form 4 were effected pursuant to a Rule 10b5-1 trading plan adopted by the reporting person on December 14, 2022.

F10 · price: The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $89.25 to $89.81 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.

SEC source: 0001288847-23-000166 · wk-form4_1701897589.xml · nonDerivative · entry 7

Kozanian Panos · CIK 0001940974 · EVP, Product Engineering

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 74,314

F2 · shares: The sales reported in this Form 4 were effected pursuant to a Rule 10b5-1 trading plan adopted by the reporting person on December 14, 2022.

F9 · price: The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $88.19 to $89.16 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.

SEC source: 0001288847-23-000166 · wk-form4_1701897589.xml · nonDerivative · entry 6

Kozanian Panos · CIK 0001940974 · EVP, Product Engineering

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 74,914

F2 · shares: The sales reported in this Form 4 were effected pursuant to a Rule 10b5-1 trading plan adopted by the reporting person on December 14, 2022.

F8 · price: The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $87.02 to $87.44 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.

SEC source: 0001288847-23-000166 · wk-form4_1701897589.xml · nonDerivative · entry 5

Kozanian Panos · CIK 0001940974 · EVP, Product Engineering

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 75,214

F2 · shares: The sales reported in this Form 4 were effected pursuant to a Rule 10b5-1 trading plan adopted by the reporting person on December 14, 2022.

F7 · price: The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $85.98 to $86.97 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.

SEC source: 0001288847-23-000166 · wk-form4_1701897589.xml · nonDerivative · entry 4

Kozanian Panos · CIK 0001940974 · EVP, Product Engineering

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 75,714

F2 · shares: The sales reported in this Form 4 were effected pursuant to a Rule 10b5-1 trading plan adopted by the reporting person on December 14, 2022.

F6 · price: The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $84.82 to $85.82, 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.

SEC source: 0001288847-23-000166 · wk-form4_1701897589.xml · nonDerivative · entry 3

Kozanian Panos · CIK 0001940974 · EVP, Product Engineering

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 77,292

F2 · shares: The sales reported in this Form 4 were effected pursuant to a Rule 10b5-1 trading plan adopted by the reporting person on December 14, 2022.

F5 · price: The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $79.38 to $80.21, 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.

SEC source: 0001288847-23-000166 · wk-form4_1701897589.xml · nonDerivative · entry 2

Kozanian Panos · CIK 0001940974 · EVP, Product Engineering

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 79,139

F2 · shares: The sales reported in this Form 4 were effected pursuant to a Rule 10b5-1 trading plan adopted by the reporting person on December 14, 2022.

F4 · price: The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $79.27 to $79.38, 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.

SEC source: 0001288847-23-000166 · wk-form4_1701897589.xml · nonDerivative · entry 1

Kozanian Panos · CIK 0001940974 · EVP, Product Engineering

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 80,091

F1 · shares: The reported sales were to cover taxes upon the vesting of restricted stock units.

F2 · shares: The sales reported in this Form 4 were effected pursuant to a Rule 10b5-1 trading plan adopted by the reporting person on December 14, 2022.

F3 · price: The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $78.26 to $79.25 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.

SEC source: 0001288847-23-000138 · wk-form4_1694119075.xml · nonDerivative · entry 3

Kozanian Panos · CIK 0001940974 · EVP, Product Engineering

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 83,911

F2 · shares: The sales reported in this Form 4 were effected pursuant to a Rule 10b5-1 trading plan adopted by the reporting person on December 14, 2022.

F5 · price: The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $70.88 to $71.57, 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.

SEC source: 0001288847-23-000138 · wk-form4_1694119075.xml · nonDerivative · entry 2

Kozanian Panos · CIK 0001940974 · EVP, Product Engineering

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 88,757

F1 · shares: The reported sales were to cover taxes upon the vesting of restricted stock units.

F4 · price: The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $70.53 to $70.92, 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.

SEC source: 0001288847-23-000138 · wk-form4_1694119075.xml · nonDerivative · entry 1

Kozanian Panos · CIK 0001940974 · EVP, Product Engineering

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 89,901

F1 · shares: The reported sales were to cover taxes upon the vesting of restricted stock units.

F2 · shares: The sales reported in this Form 4 were effected pursuant to a Rule 10b5-1 trading plan adopted by the reporting person on December 14, 2022.

F3 · price: The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $70.50 to $70.88, 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.

SEC source: 0001288847-23-000104 · wk-form4_1686172176.xml · nonDerivative · entry 4

Kozanian Panos · CIK 0001940974 · EVP, Product Engineering

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 94,913

F1 · shares: The reported sales were to cover taxes upon the vesting of restricted stock units.

F7 · price: The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $68.96 to $69.11, 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.

SEC source: 0001288847-23-000104 · wk-form4_1686172176.xml · nonDerivative · entry 3

Kozanian Panos · CIK 0001940974 · EVP, Product Engineering

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 95,865

F2 · shares: The sales reported in this Form 4 were effected pursuant to a Rule 10b5-1 trading plan adopted by the reporting person on December 14, 2022.

F6 · price: The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $69.74 to $70.37, 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.

SEC source: 0001288847-23-000104 · wk-form4_1686172176.xml · nonDerivative · entry 2

Kozanian Panos · CIK 0001940974 · EVP, Product Engineering

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 104,980

F1 · shares: The reported sales were to cover taxes upon the vesting of restricted stock units.

F2 · shares: The sales reported in this Form 4 were effected pursuant to a Rule 10b5-1 trading plan adopted by the reporting person on December 14, 2022.

F5 · price: The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $69.01 to $69.74, 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.

SEC source: 0001288847-23-000104 · wk-form4_1686172176.xml · nonDerivative · entry 1

Kozanian Panos · CIK 0001940974 · EVP, Product Engineering

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 108,083

F1 · shares: The reported sales were to cover taxes upon the vesting of restricted stock units.

F2 · shares: The sales reported in this Form 4 were effected pursuant to a Rule 10b5-1 trading plan adopted by the reporting person on December 14, 2022.

F3 · price: The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $67.97 to $68.86, 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.

F4 · balance_after: Includes 417 shares acquired under the Five9, Inc. Employee Stock Purchase Plan on May 15, 2023.

SEC source: 0001288847-23-000042 · wf-form4_167908953109000.xml · nonDerivative · entry 1

Kozanian Panos · CIK 0001940974 · EVP, Product Engineering

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 111,163

F1 · shares: The sales reported in this Form 4 were effected pursuant to a Rule 10b5-1 trading plan adopted by the reporting person on December 14, 2022.

SEC source: 0001288847-23-000037 · wf-form4_167831753817217.xml · nonDerivative · entry 2

Kozanian Panos · CIK 0001940974 · EVP, Product Engineering

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 112,674

F3 · shares: The sales reported in this Form 4 were effected pursuant to a Rule 10b5-1 trading plan adopted by the reporting person on December 11, 2021.

SEC source: 0001288847-23-000037 · wf-form4_167831753817217.xml · nonDerivative · entry 1

Kozanian Panos · CIK 0001940974 · EVP, Product Engineering

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 113,789

F1 · shares: The reported sales were to cover taxes upon the vesting of restricted stock units.

F2 · price: The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $69.00 to $69.10, 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.

SEC source: 0001288847-23-000035 · wf-form4_167771069292979.xml · nonDerivative · entry 1

Kozanian Panos · CIK 0001940974 · EVP, Product Engineering

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 115,167