PEGA

SEC source: 0001480560-25-000012 · wk-form4_1765317149.xml · derivative · entry 6

Trefler Leon · CIK 0001480560 · Chief of Clients and Markets

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 13,290

Underlying: Common stock · 2,658 shares

Expires 2027-03-07

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F1 · security: Each restricted stock unit represents the right to receive, following vesting, one share of the issuer's common stock.

F2 · derivative.exercise_date: This restricted stock unit award vested 25% on the Date Exercisable in Table II, with the remaining 75% vesting in equal quarterly amounts over the remaining 3 years.

SEC source: 0001480560-25-000012 · wk-form4_1765317149.xml · nonDerivative · entry 4

Trefler Leon · CIK 0001480560 · Chief of Clients and Markets

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 122,703

SEC source: 0001480560-25-000012 · wk-form4_1765317149.xml · nonDerivative · entry 3

Trefler Leon · CIK 0001480560 · Chief of Clients and Markets

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 123,749

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F1 · shares: Each restricted stock unit represents the right to receive, following vesting, one share of the issuer's common stock.

SEC source: 0001855325-25-000014 · wk-form4_1765317077.xml · derivative · entry 7

Akgonul Rifat Kerim · CIK 0001855325 · Chief Product Officer

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 11,392

Underlying: Common stock · 2,278 shares

Expires 2027-03-07

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F1 · security: Each restricted stock unit represents the right to receive, following vesting, one share of the issuer's common stock.

F4 · derivative.exercise_date: This restricted stock unit award vested 25% on the Date Exercisable in Table II, with the remaining 75% vesting in equal quarterly amounts over the remaining 3 years.

SEC source: 0001855325-25-000014 · wk-form4_1765317077.xml · nonDerivative · entry 4

Akgonul Rifat Kerim · CIK 0001855325 · Chief Product Officer

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 116,845

SEC source: 0001855325-25-000014 · wk-form4_1765317077.xml · nonDerivative · entry 3

Akgonul Rifat Kerim · CIK 0001855325 · Chief Product Officer

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 117,947

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F1 · shares: Each restricted stock unit represents the right to receive, following vesting, one share of the issuer's common stock.

SEC source: 0001915414-25-000010 · wk-form4_1765317304.xml · derivative · entry 5

Higgins John Gerard · CIK 0001915414 · Chief, Client &Partner Success

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 19,810

Underlying: Common stock · 2,202 shares

Expires 2028-03-05

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F1 · security: Each restricted stock unit represents the right to receive, upon vesting, one share of the issuer's common stock.

F2 · derivative.exercise_date: This restricted stock unit award vested 25% on the Date Exercisable in Table II, with the remaining 75% vesting in equal quarterly amounts over the remaining 3 years.

SEC source: 0001915414-25-000010 · wk-form4_1765317304.xml · nonDerivative · entry 2

Higgins John Gerard · CIK 0001915414 · Chief, Client &Partner Success

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 44,223

SEC source: 0001915414-25-000010 · wk-form4_1765317304.xml · nonDerivative · entry 1

Higgins John Gerard · CIK 0001915414 · Chief, Client &Partner Success

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 45,452

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F1 · shares: Each restricted stock unit represents the right to receive, upon vesting, one share of the issuer's common stock.

SEC source: 0001353196-25-000021 · wk-form4_1765317237.xml · derivative · entry 5

KOUNINIS EFSTATHIOS A · CIK 0001353196 · SVP, Chief Accounting Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 3,962

Underlying: Common stock · 440 shares

Expires 2028-03-05

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F1 · security: Each restricted stock unit represents the right to receive, following vesting, one share of the issuer's common stock.

F2 · derivative.exercise_date: This restricted stock unit award vested 25% on the Date Exercisable in Table II, with the remaining 75% vesting in equal quarterly amounts over the remaining 3 years.

SEC source: 0001353196-25-000021 · wk-form4_1765317237.xml · nonDerivative · entry 2

KOUNINIS EFSTATHIOS A · CIK 0001353196 · SVP, Chief Accounting Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 660

SEC source: 0001353196-25-000021 · wk-form4_1765317237.xml · nonDerivative · entry 1

KOUNINIS EFSTATHIOS A · CIK 0001353196 · SVP, Chief Accounting Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 834

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F1 · shares: Each restricted stock unit represents the right to receive, following vesting, one share of the issuer's common stock.

SEC source: 0001680115-25-000018 · wk-form4_1765317182.xml · derivative · entry 13

STILLWELL KENNETH · CIK 0001680115 · COO, CFO

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 0

Underlying: Common stock · 20,000 shares

Expires 2034-03-05

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F6 · derivative.exercise_date: On March 5, 2024, the reporting person was granted an option to purchase 80,000 shares of common stock. The option vests in two installments, with up to 25% to vest on the Date Exercisable in Table II based on Pegasystems' satisfaction of certain performance criteria for the fiscal year ended December 31, 2024, and with up to 75% to vest on the second anniversary of the date of grant based on Pegasystems' satisfaction of certain performance criteria for the fiscal year ended December 31, 2025. The performance criteria for the fiscal year ended December 31, 2024 were met in full, resulting in vesting of the option as to 20,000 shares.

SEC source: 0001680115-25-000018 · wk-form4_1765317182.xml · derivative · entry 12

STILLWELL KENNETH · CIK 0001680115 · COO, CFO

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 0

Underlying: Common stock · 29,240 shares

Expires 2029-03-06

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F5 · derivative.exercise_date: This stock option is fully vested.

SEC source: 0001680115-25-000018 · wk-form4_1765317182.xml · derivative · entry 11

STILLWELL KENNETH · CIK 0001680115 · COO, CFO

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 39,620

Underlying: Common stock · 4,402 shares

Expires 2028-03-05

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F1 · security: Each restricted stock unit represents the right to receive, following vesting, one share of the issuer's common stock.

F4 · derivative.exercise_date: This restricted stock unit award vested 25% on the Date Exercisable in Table II, with the remaining 75% vesting in equal quarterly amounts over the remaining 3 years.

SEC source: 0001680115-25-000018 · wk-form4_1765317182.xml · nonDerivative · entry 8

STILLWELL KENNETH · CIK 0001680115 · COO, CFO

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 131,621

F3 · price: Represents the weighted average of sale prices, ranging from $57.70 to $57.80. The individual has provided the Company, and undertakes to provide to the staff of the Security and Exchange Commission or any security holder of the Company, upon request, full information regarding the number of shares sold at each separate price.

SEC source: 0001680115-25-000018 · wk-form4_1765317182.xml · nonDerivative · entry 7

STILLWELL KENNETH · CIK 0001680115 · COO, CFO

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 132,619

F2 · price: Represents the weighted average of sale prices, ranging from $57.86 to $57.89. The individual has provided the Company, and undertakes to provide to the staff of the Security and Exchange Commission or any security holder of the Company, upon request, full information regarding the number of shares sold at each separate price.

SEC source: 0001680115-25-000018 · wk-form4_1765317182.xml · nonDerivative · entry 6

STILLWELL KENNETH · CIK 0001680115 · COO, CFO

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 138,205

SEC source: 0001680115-25-000018 · wk-form4_1765317182.xml · nonDerivative · entry 5

STILLWELL KENNETH · CIK 0001680115 · COO, CFO

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 146,026

SEC source: 0001680115-25-000018 · wk-form4_1765317182.xml · nonDerivative · entry 4

STILLWELL KENNETH · CIK 0001680115 · COO, CFO

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 181,859

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

SEC source: 0001680115-25-000018 · wk-form4_1765317182.xml · nonDerivative · entry 3

STILLWELL KENNETH · CIK 0001680115 · COO, CFO

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 161,859

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

SEC source: 0001680115-25-000018 · wk-form4_1765317182.xml · nonDerivative · entry 2

STILLWELL KENNETH · CIK 0001680115 · COO, CFO

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 132,619

SEC source: 0001680115-25-000018 · wk-form4_1765317182.xml · nonDerivative · entry 1

STILLWELL KENNETH · CIK 0001680115 · COO, CFO

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 134,352

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F1 · shares: Each restricted stock unit represents the right to receive, following vesting, one share of the issuer's common stock.

SEC source: 0001480560-25-000012 · wk-form4_1765317149.xml · derivative · entry 5

Trefler Leon · CIK 0001480560 · Chief of Clients and Markets

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 19,810

Underlying: Common stock · 2,202 shares

Expires 2028-03-05

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F1 · security: Each restricted stock unit represents the right to receive, following vesting, one share of the issuer's common stock.

F2 · derivative.exercise_date: This restricted stock unit award vested 25% on the Date Exercisable in Table II, with the remaining 75% vesting in equal quarterly amounts over the remaining 3 years.

SEC source: 0001480560-25-000012 · wk-form4_1765317149.xml · nonDerivative · entry 2

Trefler Leon · CIK 0001480560 · Chief of Clients and Markets

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 121,091

SEC source: 0001480560-25-000012 · wk-form4_1765317149.xml · nonDerivative · entry 1

Trefler Leon · CIK 0001480560 · Chief of Clients and Markets

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 121,958

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F1 · shares: Each restricted stock unit represents the right to receive, following vesting, one share of the issuer's common stock.

SEC source: 0001855325-25-000014 · wk-form4_1765317077.xml · derivative · entry 6

Akgonul Rifat Kerim · CIK 0001855325 · Chief Product Officer

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 19,810

Underlying: Common stock · 2,202 shares

Expires 2028-03-05

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F1 · security: Each restricted stock unit represents the right to receive, following vesting, one share of the issuer's common stock.

F4 · derivative.exercise_date: This restricted stock unit award vested 25% on the Date Exercisable in Table II, with the remaining 75% vesting in equal quarterly amounts over the remaining 3 years.

SEC source: 0001855325-25-000014 · wk-form4_1765317077.xml · nonDerivative · entry 2

Akgonul Rifat Kerim · CIK 0001855325 · Chief Product Officer

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 115,669

SEC source: 0001855325-25-000014 · wk-form4_1765317077.xml · nonDerivative · entry 1

Akgonul Rifat Kerim · CIK 0001855325 · Chief Product Officer

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 116,734

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F1 · shares: Each restricted stock unit represents the right to receive, following vesting, one share of the issuer's common stock.

SEC source: 0001032235-25-000022 · wk-form4_1764797545.xml · derivative · entry 7

TREFLER ALAN · CIK 0001032235 · Director · C.E.O. & Chairman · 10% owner

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 2,498

Underlying: Common stock · 2,498 shares

Expires 2026-03-02

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F1 · shares: Each restricted stock unit represents the right to receive, following vesting, one share of the issuer's common stock.

F2 · derivative.exercise_date: 20% of the restricted stock units vested on the Date Exercisable in Table II, and the remaining 80% vest in equal quarterly installments over the following four years.

SEC source: 0001032235-25-000022 · wk-form4_1764797545.xml · nonDerivative · entry 2

TREFLER ALAN · CIK 0001032235 · Director · C.E.O. & Chairman · 10% owner

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 44,845,654

SEC source: 0001032235-25-000022 · wk-form4_1764797545.xml · nonDerivative · entry 1

TREFLER ALAN · CIK 0001032235 · Director · C.E.O. & Chairman · 10% owner

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 44,846,862

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

SEC source: 0001480560-25-000010 · wk-form4_1764797450.xml · derivative · entry 6

Trefler Leon · CIK 0001480560 · Chief of Clients and Markets

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 384

Underlying: Common stock · 384 shares

Expires 2026-03-02

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F1 · shares: Each restricted stock unit represents the right to receive, following vesting, one share of common stock.

F2 · derivative.exercise_date: 20% of the restricted stock units vested on the Date Exercisable in Table II, and the remaining 80% vest in equal quarterly installments over the following four years.

SEC source: 0001480560-25-000010 · wk-form4_1764797450.xml · nonDerivative · entry 4

Trefler Leon · CIK 0001480560 · Chief of Clients and Markets

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 119,756

SEC source: 0001480560-25-000010 · wk-form4_1764797450.xml · nonDerivative · entry 3

Trefler Leon · CIK 0001480560 · Chief of Clients and Markets

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 119,908

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

SEC source: 0001680115-25-000016 · wk-form4_1764797412.xml · derivative · entry 6

STILLWELL KENNETH · CIK 0001680115 · COO, CFO

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 1,152

Underlying: Common stock · 1,154 shares

Expires 2026-03-02

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F1 · shares: Each restricted stock unit represents the right to receive, following vesting, one share of common stock.

F2 · derivative.exercise_date: 20% of the restricted stock units vested on the Date Exercisable in Table II, and the remaining 80% vest in equal quarterly installments over the following four years.

SEC source: 0001680115-25-000016 · wk-form4_1764797412.xml · nonDerivative · entry 4

STILLWELL KENNETH · CIK 0001680115 · COO, CFO

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 129,950

SEC source: 0001680115-25-000016 · wk-form4_1764797412.xml · nonDerivative · entry 3

STILLWELL KENNETH · CIK 0001680115 · COO, CFO

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 130,405

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

SEC source: 0001855325-25-000012 · wk-form4_1764797242.xml · derivative · entry 6

Akgonul Rifat Kerim · CIK 0001855325 · Chief Product Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 462

Underlying: Common stock · 460 shares

Expires 2026-03-02

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F1 · shares: Each restricted stock unit represents the right to receive, following vesting, one share of common stock.

F2 · derivative.exercise_date: 20% of the restricted stock units vested on the Date Exercisable in Table II, and the remaining 80% vest in equal quarterly installments over the following four years.

SEC source: 0001855325-25-000012 · wk-form4_1764797242.xml · nonDerivative · entry 4

Akgonul Rifat Kerim · CIK 0001855325 · Chief Product Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 114,532

SEC source: 0001855325-25-000012 · wk-form4_1764797242.xml · nonDerivative · entry 3

Akgonul Rifat Kerim · CIK 0001855325 · Chief Product Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 114,755

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

SEC source: 0001353196-25-000019 · wk-form4_1764797323.xml · derivative · entry 6

KOUNINIS EFSTATHIOS A · CIK 0001353196 · SVP, Chief Accounting Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 106

Underlying: Common stock · 106 shares

Expires 2026-03-02

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F1 · shares: Each restricted stock unit represents the right to receive, following vesting, one share of common stock.

F2 · derivative.exercise_date: 20% of the restricted stock units vested on the Date Exercisable in Table II, and the remaining 80% vest in equal quarterly installments over the following four years.

SEC source: 0001353196-25-000019 · wk-form4_1764797323.xml · nonDerivative · entry 4

KOUNINIS EFSTATHIOS A · CIK 0001353196 · SVP, Chief Accounting Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 394

SEC source: 0001353196-25-000019 · wk-form4_1764797323.xml · nonDerivative · entry 3

KOUNINIS EFSTATHIOS A · CIK 0001353196 · SVP, Chief Accounting Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 436

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

SEC source: 0001480560-25-000010 · wk-form4_1764797450.xml · derivative · entry 5

Trefler Leon · CIK 0001480560 · Chief of Clients and Markets

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 5,876

Underlying: Common stock · 1,176 shares

Expires 2027-03-01

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F1 · shares: Each restricted stock unit represents the right to receive, following vesting, one share of common stock.

F2 · derivative.exercise_date: 20% of the restricted stock units vested on the Date Exercisable in Table II, and the remaining 80% vest in equal quarterly installments over the following four years.

SEC source: 0001480560-25-000010 · wk-form4_1764797450.xml · nonDerivative · entry 2

Trefler Leon · CIK 0001480560 · Chief of Clients and Markets

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 119,524

SEC source: 0001480560-25-000010 · wk-form4_1764797450.xml · nonDerivative · entry 1

Trefler Leon · CIK 0001480560 · Chief of Clients and Markets

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 119,987

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

SEC source: 0001680115-25-000016 · wk-form4_1764797412.xml · derivative · entry 5

STILLWELL KENNETH · CIK 0001680115 · COO, CFO

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 11,754

Underlying: Common stock · 2,350 shares

Expires 2027-03-01

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F1 · shares: Each restricted stock unit represents the right to receive, following vesting, one share of common stock.

F2 · derivative.exercise_date: 20% of the restricted stock units vested on the Date Exercisable in Table II, and the remaining 80% vest in equal quarterly installments over the following four years.

SEC source: 0001680115-25-000016 · wk-form4_1764797412.xml · nonDerivative · entry 2

STILLWELL KENNETH · CIK 0001680115 · COO, CFO

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 129,251

SEC source: 0001680115-25-000016 · wk-form4_1764797412.xml · nonDerivative · entry 1

STILLWELL KENNETH · CIK 0001680115 · COO, CFO

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 130,176

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.