Summy Amy B.

SEC source: 0000920148-26-000176 · form4.xml · nonDerivative · entry 1

Summy Amy B. · CIK 0001805303 · EVP, Chief Marketing Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 6,955.5

SEC source: 0000920148-26-000119 · form4.xml · nonDerivative · entry 2

Summy Amy B. · CIK 0001805303 · EVP, Chief Marketing Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 7,879.5

F2 · kind: Stock withholding to satisfy tax withholding obligations.

SEC source: 0000920148-26-000119 · form4.xml · nonDerivative · entry 1

Summy Amy B. · CIK 0001805303 · EVP, Chief Marketing Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 9,715.5

F1 · kind: Shares acquired on March 26, 2026, pursuant to a performance award granted on February 7, 2023, relating to performance during the three-year period ended December 31, 2025.

SEC source: 0000920148-26-000092 · form4.xml · derivative · entry 3

Summy Amy B. · CIK 0001805303 · EVP, Chief Marketing Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 1,304

Underlying: Common Stock · 230 shares

Expires not disclosed

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 · derivative.exercise_price: Each Restricted Stock Unit represents the contingent right to receive one share of Labcorp Holdings Inc. Common Stock.

F3 · derivative.exercise_date: The Restricted Stock Units that have vested were part of a grant that vests in three equal annual installments beginning on February 11, 2026.

F3 · derivative.expiration_date: The Restricted Stock Units that have vested were part of a grant that vests in three equal annual installments beginning on February 11, 2026.

F4 · balance_after: This number reflects the aggregate number of Restricted Stock Units held by the reporting person.

SEC source: 0000920148-26-000092 · form4.xml · nonDerivative · entry 2

Summy Amy B. · CIK 0001805303 · EVP, Chief Marketing Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 5,721.5

F2 · kind: Stock withholding to satisfy tax withholding obligations.

SEC source: 0000920148-26-000092 · form4.xml · nonDerivative · entry 1

Summy Amy B. · CIK 0001805303 · EVP, Chief Marketing Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 5,804.5

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 · price: Each Restricted Stock Unit represents the contingent right to receive one share of Labcorp Holdings Inc. Common Stock.

SEC source: 0000920148-26-000063 · form4.xml · derivative · entry 2

Summy Amy B. · CIK 0001805303 · EVP, Chief Marketing Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 1,534

Underlying: Common Stock · 620 shares

Expires not disclosed

F3 · derivative.exercise_price: Each Restricted Stock Unit represents the contingent right to receive one share of Labcorp Holdings Inc. Common Stock.

F4 · derivative.exercise_date: The Restricted Stock Units vest in three equal annual installments beginning on February 10, 2027.

F4 · derivative.expiration_date: The Restricted Stock Units vest in three equal annual installments beginning on February 10, 2027.

F5 · balance_after: This number reflects the aggregate number of Restricted Stock Units held by the reporting person.

SEC source: 0000920148-26-000063 · form4.xml · derivative · entry 1

Summy Amy B. · CIK 0001805303 · EVP, Chief Marketing Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 1,900

Underlying: Common Stock · 1,900 shares

Expires 2036-02-09

F1 · security: Employee stock option (right to buy) granted pursuant to the Labcorp Holdings Inc. 2025 Omnibus Incentive Plan.

F2 · derivative.exercise_date: The option vests in three equal annual installments beginning on the date reflected in this column.

SEC source: 0000920148-26-000022 · form4.xml · nonDerivative · entry 4

Summy Amy B. · CIK 0001805303 · EVP, Chief Marketing Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 5,574.5

F2 · kind: Stock withholding to satisfy tax withholding obligations.

SEC source: 0000920148-26-000022 · form4.xml · derivative · entry 6

Summy Amy B. · CIK 0001805303 · EVP, Chief Marketing Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 914

Underlying: Common Stock · 222 shares

Expires not disclosed

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 · derivative.exercise_price: Each Restricted Stock Unit represents the contingent right to receive one share of Labcorp Holdings Inc. Common Stock.

F5 · derivative.exercise_date: The Restricted Stock Units vested in three equal annual installments beginning on February 7, 2024 and are now fully vested.

F5 · derivative.expiration_date: The Restricted Stock Units vested in three equal annual installments beginning on February 7, 2024 and are now fully vested.

F4 · balance_after: This number reflects the aggregate number of Restricted Stock Units held by the reporting person.

SEC source: 0000920148-26-000022 · form4.xml · nonDerivative · entry 3

Summy Amy B. · CIK 0001805303 · EVP, Chief Marketing Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 5,654.5

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 · price: Each Restricted Stock Unit represents the contingent right to receive one share of Labcorp Holdings Inc. Common Stock.

SEC source: 0000920148-26-000022 · form4.xml · derivative · entry 5

Summy Amy B. · CIK 0001805303 · EVP, Chief Marketing Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 1,136

Underlying: Common Stock · 223 shares

Expires not disclosed

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 · derivative.exercise_price: Each Restricted Stock Unit represents the contingent right to receive one share of Labcorp Holdings Inc. Common Stock.

F3 · derivative.exercise_date: The Restricted Stock Units that have vested were part of a grant that vests in three equal annual installments beginning on February 6, 2025.

F3 · derivative.expiration_date: The Restricted Stock Units that have vested were part of a grant that vests in three equal annual installments beginning on February 6, 2025.

F4 · balance_after: This number reflects the aggregate number of Restricted Stock Units held by the reporting person.

SEC source: 0000920148-26-000022 · form4.xml · nonDerivative · entry 2

Summy Amy B. · CIK 0001805303 · EVP, Chief Marketing Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 5,432.5

F2 · kind: Stock withholding to satisfy tax withholding obligations.

SEC source: 0000920148-26-000022 · form4.xml · nonDerivative · entry 1

Summy Amy B. · CIK 0001805303 · EVP, Chief Marketing Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 5,524.5

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 · price: Each Restricted Stock Unit represents the contingent right to receive one share of Labcorp Holdings Inc. Common Stock.

SEC source: 0001127602-25-010627 · form4.xml · nonDerivative · entry 3

Summy Amy B. · CIK 0001805303 · EVP, Chief Marketing Officer

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 5,301.5

F3 · kind: Pursuant to a plan in accordance with Rule 10b5-1 under the Securities Exchange Act of 1934, as amended.

SEC source: 0001127602-25-010627 · form4.xml · nonDerivative · entry 2

Summy Amy B. · CIK 0001805303 · EVP, Chief Marketing Officer

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 6,059.5

F2 · kind: Stock withholding to satisfy tax withholding obligations.

SEC source: 0001127602-25-010627 · form4.xml · nonDerivative · entry 1

Summy Amy B. · CIK 0001805303 · EVP, Chief Marketing Officer

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 6,621.5

F1 · kind: Shares acquired on March 27, 2025, pursuant to a performance award granted on February 11, 2022, relating to performance during the three-year period ended December 31, 2024.

SEC source: 0001127602-25-006779 · form4.xml · nonDerivative · entry 1

Summy Amy B. · CIK 0001805303 · EVP, Chief Marketing Officer

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 4,544.5

F1 · kind: Pursuant to a plan in accordance with Rule 10b5-1 under the Securities Exchange Act of 1934, as amended.

SEC source: 0001127602-25-004556 · form4.xml · derivative · entry 5

Summy Amy B. · CIK 0001805303 · EVP, Chief Marketing Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 1,359

Underlying: Common Stock · 201 shares

Expires not disclosed

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 · derivative.exercise_price: Each Restricted Stock Unit represents the contingent right to receive one share of Labcorp Holdings Inc. Common Stock.

F7 · derivative.exercise_date: The Restricted Stock Units vested in three equal annual installments beginning on February 11, 2023 and are now fully vested.

F7 · derivative.expiration_date: The Restricted Stock Units vested in three equal annual installments beginning on February 11, 2023 and are now fully vested.

F6 · balance_after: This number reflects the aggregate number of Restricted Stock Units held by the reporting person.

SEC source: 0001127602-25-004556 · form4.xml · derivative · entry 4

Summy Amy B. · CIK 0001805303 · EVP, Chief Marketing Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 1,560

Underlying: Common Stock · 690 shares

Expires not disclosed

F1 · derivative.exercise_price: Each Restricted Stock Unit represents the contingent right to receive one share of Labcorp Holdings Inc. Common Stock.

F5 · derivative.exercise_date: The Restricted Stock Units vest in three equal annual installments beginning on February 11, 2026.

F5 · derivative.expiration_date: The Restricted Stock Units vest in three equal annual installments beginning on February 11, 2026.

F6 · balance_after: This number reflects the aggregate number of Restricted Stock Units held by the reporting person.

SEC source: 0001127602-25-004556 · form4.xml · derivative · entry 3

Summy Amy B. · CIK 0001805303 · EVP, Chief Marketing Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 2,100

Underlying: Common Stock · 2,100 shares

Expires 2035-02-10

F3 · security: Employee stock option (right to buy) granted pursuant to the Labcorp Holdings Inc. Amended and Restated 2016 Omnibus Incentive Plan.

F4 · derivative.exercise_date: The option vests in three equal annual installments beginning on the date reflected in this column.

SEC source: 0001127602-25-004556 · form4.xml · nonDerivative · entry 2

Summy Amy B. · CIK 0001805303 · EVP, Chief Marketing Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 4,770.5

F2 · kind: Stock withholding to satisfy tax withholding obligations.

SEC source: 0001127602-25-004556 · form4.xml · nonDerivative · entry 1

Summy Amy B. · CIK 0001805303 · EVP, Chief Marketing Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 4,825.5

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 · price: Each Restricted Stock Unit represents the contingent right to receive one share of Labcorp Holdings Inc. Common Stock.

SEC source: 0001127602-25-003717 · form4.xml · derivative · entry 6

Summy Amy B. · CIK 0001805303 · EVP, Chief Marketing Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 870

Underlying: Common Stock · 224 shares

Expires not disclosed

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 · derivative.exercise_price: Each Restricted Stock Unit represents the contingent right to receive one share of Labcorp Holdings Inc. Common Stock.

F5 · derivative.exercise_date: The Restricted Stock Units that have vested were part of a grant that vests in three equal annual installments beginning on February 7, 2024.

F5 · derivative.expiration_date: The Restricted Stock Units that have vested were part of a grant that vests in three equal annual installments beginning on February 7, 2024.

F4 · balance_after: This number reflects the aggregate number of Restricted Stock Units held by the reporting person.

SEC source: 0001127602-25-003717 · form4.xml · nonDerivative · entry 4

Summy Amy B. · CIK 0001805303 · EVP, Chief Marketing Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 4,624.5

F2 · kind: Stock withholding to satisfy tax withholding obligations.

SEC source: 0001127602-25-003717 · form4.xml · nonDerivative · entry 3

Summy Amy B. · CIK 0001805303 · EVP, Chief Marketing Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 4,692.5

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 · price: Each Restricted Stock Unit represents the contingent right to receive one share of Labcorp Holdings Inc. Common Stock.

SEC source: 0001127602-25-003717 · form4.xml · derivative · entry 5

Summy Amy B. · CIK 0001805303 · EVP, Chief Marketing Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 1,094

Underlying: Common Stock · 223 shares

Expires not disclosed

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 · derivative.exercise_price: Each Restricted Stock Unit represents the contingent right to receive one share of Labcorp Holdings Inc. Common Stock.

F3 · derivative.exercise_date: The Restricted Stock Units that have vested were part of a grant that vests in three equal annual installments beginning on February 6, 2025.

F3 · derivative.expiration_date: The Restricted Stock Units that have vested were part of a grant that vests in three equal annual installments beginning on February 6, 2025.

F4 · balance_after: This number reflects the aggregate number of Restricted Stock Units held by the reporting person.

SEC source: 0001127602-25-003717 · form4.xml · nonDerivative · entry 2

Summy Amy B. · CIK 0001805303 · EVP, Chief Marketing Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 4,468.5

F2 · kind: Stock withholding to satisfy tax withholding obligations.

SEC source: 0001127602-25-003717 · form4.xml · nonDerivative · entry 1

Summy Amy B. · CIK 0001805303 · EVP, Chief Marketing Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 4,541.5

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 · price: Each Restricted Stock Unit represents the contingent right to receive one share of Labcorp Holdings Inc. Common Stock.

SEC source: 0001127602-24-028052 · form4.xml · derivative · entry 3

Summy Amy B. · CIK 0001805303 · EVP, Chief Marketing Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 0

Underlying: Common Stock · 4,015 shares

Expires 2030-02-03

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.

F2 · security: Employee stock option (right to buy) granted pursuant to the Labcorp Holdings Inc. Amended and Restated 2016 Omnibus Incentive Plan.

F3 · derivative.exercise_price: Represents amounts automatically adjusted based on the final adjustment ratio applied to equity awards in connection with the spin-off of Fortrea Holdings Inc. ("Fortrea") by Labcorp Holdings Inc. ("LHI"), calculated pursuant to the terms of the Employee Matters Agreement by and between LHI and Fortrea.

F3 · shares: Represents amounts automatically adjusted based on the final adjustment ratio applied to equity awards in connection with the spin-off of Fortrea Holdings Inc. ("Fortrea") by Labcorp Holdings Inc. ("LHI"), calculated pursuant to the terms of the Employee Matters Agreement by and between LHI and Fortrea.

F4 · derivative.exercise_date: The option vested in three equal annual installments beginning on the date reflected in this column.

SEC source: 0001127602-24-028052 · form4.xml · nonDerivative · entry 2

Summy Amy B. · CIK 0001805303 · EVP, Chief Marketing Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 4,318.5

F1 · price: The price of $238.9055 per share represents a weighted average of sales prices ranging from $238.822 to $239.410 per share. The reporting person undertakes to provide upon request by the Commission staff, the issuer, or a security holder of the issuer, full information regarding the number of shares purchased or sold at each separate price.

SEC source: 0001127602-24-028052 · form4.xml · nonDerivative · entry 1

Summy Amy B. · CIK 0001805303 · EVP, Chief Marketing Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 7,990

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: 0001127602-24-012005 · form4.xml · nonDerivative · entry 1

Summy Amy B. · CIK 0001805303 · EVP, Chief Marketing Officer

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 3,975

F1 · kind: Pursuant to a plan in accordance with Rule 10b5-1 under the Securities Exchange Act of 1934, as amended.

SEC source: 0000920148-24-000019 · primary_doc.xml · derivative · entry 3

Summy Amy B. · CIK 0001805303 · EVP, Chief Marketing Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 1,317

Underlying: Common Stock · 5,778 shares

Expires not disclosed

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 · derivative.exercise_price: Each Restricted Stock Unit ("RSU") represents the contingent right to receive one share of Laboratory Corporation of America Holdings ("Labcorp") Common Stock.

F1 · price: Each Restricted Stock Unit ("RSU") represents the contingent right to receive one share of Laboratory Corporation of America Holdings ("Labcorp") Common Stock.

F3 · derivative.exercise_date: As previously reported, in connection with the spin-off ("Spin-Off") of Fortrea Holdings Inc. ("Fortrea") by Labcorp, performance awards granted by Labcorp in 2021 for the 3-year performance period through December 31, 2023 (the "2021 PSA") were converted into time-vesting RSUs of Labcorp pursuant to the terms of the Employee Matters Agreement (the "EMA") by and between Labcorp and Fortrea. The 2021 PSA was converted into a number of time-vesting Labcorp RSUs, based on the degree of achievement of the performance criteria subject to the 2021 PSA prior to the Spin-Off and the final adjustment ratio applied to Labcorp equity awards in connection with the Spin-Off, calculated pursuant to the terms of the EMA, which fully vested on March 27, 2024.

F3 · derivative.expiration_date: As previously reported, in connection with the spin-off ("Spin-Off") of Fortrea Holdings Inc. ("Fortrea") by Labcorp, performance awards granted by Labcorp in 2021 for the 3-year performance period through December 31, 2023 (the "2021 PSA") were converted into time-vesting RSUs of Labcorp pursuant to the terms of the Employee Matters Agreement (the "EMA") by and between Labcorp and Fortrea. The 2021 PSA was converted into a number of time-vesting Labcorp RSUs, based on the degree of achievement of the performance criteria subject to the 2021 PSA prior to the Spin-Off and the final adjustment ratio applied to Labcorp equity awards in connection with the Spin-Off, calculated pursuant to the terms of the EMA, which fully vested on March 27, 2024.

F4 · balance_after: This number reflects the aggregate number of RSUs held by the reporting person.

SEC source: 0000920148-24-000019 · primary_doc.xml · nonDerivative · entry 2

Summy Amy B. · CIK 0001805303 · EVP, Chief Marketing Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 7,475

F2 · kind: Stock withholding to satisfy tax withholding obligations.

SEC source: 0000920148-24-000019 · primary_doc.xml · nonDerivative · entry 1

Summy Amy B. · CIK 0001805303 · EVP, Chief Marketing Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 9,637

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 · price: Each Restricted Stock Unit ("RSU") represents the contingent right to receive one share of Laboratory Corporation of America Holdings ("Labcorp") Common Stock.

SEC source: 0001127602-24-009300 · form4.xml · nonDerivative · entry 1

Summy Amy B. · CIK 0001805303 · EVP, Chief Marketing Officer

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 3,859

F1 · kind: Pursuant to a plan in accordance with Rule 10b5-1 under the Securities Exchange Act of 1934, as amended.

SEC source: 0001127602-24-004637 · form4.xml · nonDerivative · entry 2

Summy Amy B. · CIK 0001805303 · EVP, Chief Marketing Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 4,086

F2 · kind: Stock withholding to satisfy tax withholding obligations.

SEC source: 0001127602-24-004637 · form4.xml · derivative · entry 3

Summy Amy B. · CIK 0001805303 · EVP, Chief Marketing Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 7,095

Underlying: Common Stock · 201 shares

Expires not disclosed

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 · derivative.exercise_price: Each Restricted Stock Unit represents the contingent right to receive one share of Laboratory Corporation of America Holdings Common Stock.

F3 · derivative.exercise_date: The Restricted Stock Units that have vested were part of a grant that vests in three equal annual installments beginning on February 11, 2023.

F3 · derivative.expiration_date: The Restricted Stock Units that have vested were part of a grant that vests in three equal annual installments beginning on February 11, 2023.

F4 · balance_after: This number reflects the aggregate number of Restricted Stock Units held by the reporting person.

SEC source: 0001127602-24-004637 · form4.xml · nonDerivative · entry 1

Summy Amy B. · CIK 0001805303 · EVP, Chief Marketing Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 4,152

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 · price: Each Restricted Stock Unit represents the contingent right to receive one share of Laboratory Corporation of America Holdings Common Stock.

SEC source: 0001127602-24-003953 · form4.xml · derivative · entry 5

Summy Amy B. · CIK 0001805303 · EVP, Chief Marketing Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 7,296

Underlying: Common Stock · 224 shares

Expires not disclosed

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 · derivative.exercise_price: Each Restricted Stock Unit represents the contingent right to receive one share of Laboratory Corporation of America Holdings Common Stock.

F7 · derivative.exercise_date: The Restricted Stock Units that have vested were part of a grant that vests in three equal annual installments beginning on February 7, 2024.

F7 · derivative.expiration_date: The Restricted Stock Units that have vested were part of a grant that vests in three equal annual installments beginning on February 7, 2024.

F4 · balance_after: This number reflects the aggregate number of Restricted Stock Units held by the reporting person.

SEC source: 0001127602-24-003953 · form4.xml · nonDerivative · entry 2

Summy Amy B. · CIK 0001805303 · EVP, Chief Marketing Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 3,951

F2 · kind: Stock withholding to satisfy tax withholding obligations.

SEC source: 0001127602-24-003953 · form4.xml · nonDerivative · entry 1

Summy Amy B. · CIK 0001805303 · EVP, Chief Marketing Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 4,024

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 · price: Each Restricted Stock Unit represents the contingent right to receive one share of Laboratory Corporation of America Holdings Common Stock.

SEC source: 0001127602-24-003953 · form4.xml · derivative · entry 4

Summy Amy B. · CIK 0001805303 · EVP, Chief Marketing Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 2,100

Underlying: Common Stock · 2,100 shares

Expires 2034-02-05

F5 · security: Employee stock option (right to buy) granted pursuant to the Laboratory Corporation of America Holdings 2016 Omnibus Incentive Plan.

F6 · derivative.exercise_date: The option vests in three equal annual installments beginning on the date reflected in this column.

SEC source: 0001127602-24-003953 · form4.xml · derivative · entry 3

Summy Amy B. · CIK 0001805303 · EVP, Chief Marketing Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 7,520

Underlying: Common Stock · 670 shares

Expires not disclosed

F1 · derivative.exercise_price: Each Restricted Stock Unit represents the contingent right to receive one share of Laboratory Corporation of America Holdings Common Stock.

F3 · derivative.exercise_date: The Restricted Stock Units vest in three equal annual installments beginning on February 6, 2025.

F3 · derivative.expiration_date: The Restricted Stock Units vest in three equal annual installments beginning on February 6, 2025.

F4 · balance_after: This number reflects the aggregate number of Restricted Stock Units held by the reporting person.

SEC source: 0001127602-24-003577 · form4.xml · derivative · entry 3

Summy Amy B. · CIK 0001805303 · EVP, Chief Marketing Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 6,850

Underlying: Common Stock · 246 shares

Expires not disclosed

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 · derivative.exercise_price: Each Restricted Stock Unit represents the contingent right to receive one share of Laboratory Corporation of America Holdings Common Stock.

F3 · derivative.exercise_date: The Restricted Stock Units vested in three equal annual installments beginning on February 2, 2022 and are now fully vested.

F3 · derivative.expiration_date: The Restricted Stock Units vested in three equal annual installments beginning on February 2, 2022 and are now fully vested.

F4 · balance_after: This number reflects the aggregate number of Restricted Stock Units held by the reporting person. Amount includes an additional 92 Restricted Stock Units resulting from the final adjustment ratio calculated pursuant to the terms of the Employee Matters Agreement by and between Laboratory Corporation of America Holdings and Fortrea Holdings Inc.

SEC source: 0001127602-24-003577 · form4.xml · nonDerivative · entry 2

Summy Amy B. · CIK 0001805303 · EVP, Chief Marketing Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 3,800

F2 · kind: Stock withholding to satisfy tax withholding obligations.

SEC source: 0001127602-24-003577 · form4.xml · nonDerivative · entry 1

Summy Amy B. · CIK 0001805303 · EVP, Chief Marketing Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 3,880

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 · price: Each Restricted Stock Unit represents the contingent right to receive one share of Laboratory Corporation of America Holdings Common Stock.

SEC source: 0001127602-23-020297 · form4.xml · derivative · entry 1

Summy Amy B. · CIK 0001805303 · EVP, Chief Marketing Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 7,004

Underlying: Common Stock · 5,824 shares

Expires not disclosed

F1 · derivative.exercise_price: Each Restricted Stock Unit represents the contingent right to receive one share of Laboratory Corporation of America Holdings Common Stock.

F2 · derivative.exercise_date: In connection with the spin-off ("Spin-Off") of Fortrea Holdings Inc. ("Fortrea") by Laboratory Corporation of America Holdings ("Labcorp"), performance awards granted by Labcorp in 2021 for the 3-year performance period through December 31, 2023 (the "2021 PSA") were converted into time-vesting restricted stock units ("RSUs") of Labcorp pursuant to the terms of the Employee Matters Agreement by and between Labcorp and Fortrea (the "EMA"). The 2021 PSA was converted into a number of time-vesting Labcorp RSUs based on the degree of achievement of the performance criteria subject to the 2021 PSA prior to the Spin-Off and the adjustment ratio that applies to Labcorp equity awards in the Spin-Off, with vesting on the 30th day following Labcorp's filing of an annual report on Form 10-K that includes audited financial statements with respect to the 3-year period ending December 31, 2023. Amounts are estimates pending finalization of the adjustment ratio pursuant to the EMA.

F2 · derivative.expiration_date: In connection with the spin-off ("Spin-Off") of Fortrea Holdings Inc. ("Fortrea") by Laboratory Corporation of America Holdings ("Labcorp"), performance awards granted by Labcorp in 2021 for the 3-year performance period through December 31, 2023 (the "2021 PSA") were converted into time-vesting restricted stock units ("RSUs") of Labcorp pursuant to the terms of the Employee Matters Agreement by and between Labcorp and Fortrea (the "EMA"). The 2021 PSA was converted into a number of time-vesting Labcorp RSUs based on the degree of achievement of the performance criteria subject to the 2021 PSA prior to the Spin-Off and the adjustment ratio that applies to Labcorp equity awards in the Spin-Off, with vesting on the 30th day following Labcorp's filing of an annual report on Form 10-K that includes audited financial statements with respect to the 3-year period ending December 31, 2023. Amounts are estimates pending finalization of the adjustment ratio pursuant to the EMA.

F3 · balance_after: This number reflects the aggregate number of Restricted Stock Units held by the reporting person.

SEC source: 0001127602-23-011744 · form4.xml · nonDerivative · entry 2

Summy Amy B. · CIK 0001805303 · EVP, Chief Marketing Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 3,634

F2 · kind: Stock withholding to satisfy tax withholding obligations.