NTCT

SEC source: 0000899243-19-002615 · doc4.xml · nonDerivative · entry 1

BUA JEAN A · CIK 0001183333 · See Remarks

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 68,751

F1 · kind: The shares of Common Stock were withheld to satisfy the reporting person's tax withholding obligation upon the vesting of restricted stock units which vested on 12/11/2018 and which shares of Common Stock were delivered to the reporting person on 2/1/2019.

F2 · price: Represents the closing price of the Company's Common Stock on January 31, 2019.

SEC source: 0000899243-19-002617 · doc4.xml · nonDerivative · entry 1

SZABADOS MICHAEL · CIK 0001232884 · See Remarks

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 49,403

F1 · kind: The shares of Common Stock were withheld to satisfy the reporting person's tax withholding obligation upon the vesting of restricted stock units which vested on 12/11/2018 and which shares of Common Stock were delivered to the reporting person on 2/1/2019.

F2 · price: Represents the closing price of the Company's Common Stock on January 31, 2019.

SEC source: 0000899243-19-002621 · doc4.xml · nonDerivative · entry 1

DOWNING JOHN · CIK 0001232878 · See Remarks

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 101,366

F1 · kind: The shares of Common Stock were withheld to satisfy the reporting person's tax withholding obligation upon the vesting of restricted stock units which vested on 12/11/2018 and which shares of Common Stock were delivered to the reporting person on 2/1/2019.

F2 · price: Represents the closing price of the Company's Common Stock on January 31, 2019.

SEC source: 0000899243-18-031336 · doc4.xml · nonDerivative · entry 1

SINGHAL ANIL K · CIK 0001040585 · Director · Chief Executive Officer

10b5-1 filing: Not disclosed

Ownership: Indirect · See Footnote

Disclosed balance after: 2,312,169

F1 · kind: The transfer was made without receipt of consideration by the reporting person to a charitable foundation in which the reporting person is a trustee but has no pecuniary interest.

F1 · price: The transfer was made without receipt of consideration by the reporting person to a charitable foundation in which the reporting person is a trustee but has no pecuniary interest.

F2 · ownership.nature: The shares of Common Stock are beneficially owned by various trusts for the benefit of the reporting person and his spouse.

SEC source: 0000899243-18-030726 · doc4.xml · derivative · entry 2

SZABADOS MICHAEL · CIK 0001232884 · Chief Operating Officer

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 86,250

Underlying: Common Stock · 50 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.

F2 · derivative.exercise_price: Price is N/A.

F2 · price: Price is N/A.

F3 · derivative.expiration_date: Date is N/A.

SEC source: 0000899243-18-030726 · doc4.xml · nonDerivative · entry 1

SZABADOS MICHAEL · CIK 0001232884 · Chief Operating Officer

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 49,421

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 · kind: The shares of Common Stock were acquired upon the vesting of certain restricted stock units previously granted to the reporting person.

F2 · price: Price is N/A.

F1 · acquired: The shares of Common Stock were acquired upon the vesting of certain restricted stock units previously granted to the reporting person.

SEC source: 0000899243-18-030725 · doc4.xml · derivative · entry 2

BUA JEAN A · CIK 0001183333 · See Remarks

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 75,000

Underlying: Common Stock · 50 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.

F2 · derivative.exercise_price: Price is N/A.

F2 · price: Price is N/A.

F3 · derivative.expiration_date: Date is N/A.

SEC source: 0000899243-18-030725 · doc4.xml · nonDerivative · entry 1

BUA JEAN A · CIK 0001183333 · See Remarks

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 68,801

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 · kind: The shares of Common Stock were acquired upon the vesting of certain restricted stock units previously granted to the reporting person.

F2 · price: Price is N/A.

F1 · acquired: The shares of Common Stock were acquired upon the vesting of certain restricted stock units previously granted to the reporting person.

SEC source: 0000899243-18-030724 · doc4.xml · derivative · entry 2

DOWNING JOHN · CIK 0001232878 · See Remarks

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 75,000

Underlying: Common Stock · 50 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.

F2 · derivative.exercise_price: Price is N/A.

F2 · price: Price is N/A.

F3 · derivative.expiration_date: Date is N/A.

SEC source: 0000899243-18-030724 · doc4.xml · nonDerivative · entry 1

DOWNING JOHN · CIK 0001232878 · See Remarks

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 101,384

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 · kind: The shares of Common Stock were acquired upon the vesting of certain restricted stock units previously granted to the reporting person.

F2 · price: Price is N/A.

F1 · acquired: The shares of Common Stock were acquired upon the vesting of certain restricted stock units previously granted to the reporting person.

SEC source: 0000899243-18-029811 · doc4.xml · nonDerivative · entry 1

HADZIMA JOSEPH G JR · CIK 0001232881 · Director

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 117,298

F1 · kind: The shares of Common Stock were sold pursuant to a 10b5-1 plan.

F1 · acquired: The shares of Common Stock were sold pursuant to a 10b5-1 plan.

SEC source: 0000899243-18-028920 · doc4.xml · nonDerivative · entry 1

HADZIMA JOSEPH G JR · CIK 0001232881 · Director

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 119,048

F1 · kind: The shares of Common Stock were sold pursuant to a 10b5-1 plan.

F1 · acquired: The shares of Common Stock were sold pursuant to a 10b5-1 plan.

SEC source: 0000899243-18-028915 · doc4.xml · derivative · entry 3

BUA JEAN A · CIK 0001183333 · See Remarks

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 75,050

Underlying: Common Stock · 6,250 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.

F2 · derivative.exercise_price: Price is N/A.

F2 · price: Price is N/A.

F5 · derivative.expiration_date: Date is N/A.

SEC source: 0000899243-18-028915 · doc4.xml · nonDerivative · entry 2

BUA JEAN A · CIK 0001183333 · See Remarks

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 68,751

F3 · kind: The shares of Common Stock were withheld to satisfy the reporting person's tax withholding obligation upon the vesting of restricted stock units.

F4 · price: Represents the closing price of the Company's Common Stock on November 12, 2018.

SEC source: 0000899243-18-028915 · doc4.xml · nonDerivative · entry 1

BUA JEAN A · CIK 0001183333 · See Remarks

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 70,592

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 · kind: The shares of Common Stock were acquired upon the vesting of certain restricted stock units previously granted to the reporting person.

F2 · price: Price is N/A.

F1 · acquired: The shares of Common Stock were acquired upon the vesting of certain restricted stock units previously granted to the reporting person.

SEC source: 0000899243-18-028921 · doc4.xml · derivative · entry 3

DOWNING JOHN · CIK 0001232878 · See Remarks

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 75,050

Underlying: Common Stock · 6,250 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.

F2 · derivative.exercise_price: Price is N/A.

F2 · price: Price is N/A.

F5 · derivative.expiration_date: Date is N/A.

SEC source: 0000899243-18-028921 · doc4.xml · nonDerivative · entry 2

DOWNING JOHN · CIK 0001232878 · See Remarks

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 101,334

F3 · kind: The shares of Common Stock were withheld to satisfy the reporting person's tax withholding obligation upon the vesting of restricted stock units.

F4 · price: Represents the closing price of the Company's Common Stock on November 12, 2018.

SEC source: 0000899243-18-028921 · doc4.xml · nonDerivative · entry 1

DOWNING JOHN · CIK 0001232878 · See Remarks

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 103,175

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 · kind: The shares of Common Stock were acquired upon the vesting of certain restricted stock units previously granted to the reporting person.

F2 · price: Price is N/A.

F1 · acquired: The shares of Common Stock were acquired upon the vesting of certain restricted stock units previously granted to the reporting person.

SEC source: 0000899243-18-028914 · doc4.xml · derivative · entry 4

SINGHAL ANIL K · CIK 0001040585 · Director · Chief Executive Officer

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 147,500

Underlying: Common Stock · 12,500 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.

F2 · derivative.exercise_price: Price is N/A.

F2 · price: Price is N/A.

F6 · derivative.expiration_date: Date is N/A.

SEC source: 0000899243-18-028914 · doc4.xml · nonDerivative · entry 2

SINGHAL ANIL K · CIK 0001040585 · Director · Chief Executive Officer

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 167,946

F3 · kind: The shares of Common Stock were withheld to satisfy the reporting person's tax withholding obligation upon the vesting of restricted stock units.

F4 · price: Represents the closing price of the Company's Common Stock on November 12, 2018.

SEC source: 0000899243-18-028914 · doc4.xml · nonDerivative · entry 1

SINGHAL ANIL K · CIK 0001040585 · Director · Chief Executive Officer

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 173,503

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 · kind: The shares of Common Stock were acquired upon the vesting of certain restricted stock units previously granted to the reporting person.

F2 · price: Price is N/A.

F1 · acquired: The shares of Common Stock were acquired upon the vesting of certain restricted stock units previously granted to the reporting person.

SEC source: 0000899243-18-028912 · doc4.xml · derivative · entry 3

SZABADOS MICHAEL · CIK 0001232884 · Chief Operating Officer

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 86,300

Underlying: Common Stock · 7,500 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.

F2 · derivative.exercise_price: Price is N/A.

F2 · price: Price is N/A.

F5 · derivative.expiration_date: Date is N/A.

SEC source: 0000899243-18-028912 · doc4.xml · nonDerivative · entry 2

SZABADOS MICHAEL · CIK 0001232884 · Chief Operating Officer

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 49,371

F3 · kind: The shares of Common Stock were withheld to satisfy the reporting person's tax withholding obligation upon the vesting of restricted stock units.

F4 · price: Represents the closing price of the Company's Common Stock on November 12, 2018.

SEC source: 0000899243-18-028912 · doc4.xml · nonDerivative · entry 1

SZABADOS MICHAEL · CIK 0001232884 · Chief Operating Officer

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 51,580

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 · kind: The shares of Common Stock were acquired upon the vesting of certain restricted stock units previously granted to the reporting person.

F2 · price: Price is N/A.

F1 · acquired: The shares of Common Stock were acquired upon the vesting of certain restricted stock units previously granted to the reporting person.

SEC source: 0000899243-18-028411 · doc4.xml · nonDerivative · entry 1

DOWNING JOHN · CIK 0001232878 · See Remarks

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 96,925

F1 · kind: The shares of Common Stock were sold pursuant to a 10b5-1 plan.

F2 · price: The shares sold on this date were sold in multiple transactions. This price is the weighted average sales price per share; the actual sales price per share ranged from $27.65 to $28.09. The reporting person undertakes to provide to NetScout Systems, Inc., any security holder of NetScout Systems, 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 range set forth in this footnote (2) to this Form 4.

F1 · acquired: The shares of Common Stock were sold pursuant to a 10b5-1 plan.

SEC source: 0000899243-18-028409 · doc4.xml · nonDerivative · entry 1

SZABADOS MICHAEL · CIK 0001232884 · Chief Operating Officer

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 44,080

F1 · kind: The shares of Common Stock were sold pursuant to a 10b5-1 plan.

F2 · price: The shares sold on this date were sold in multiple transactions. This price is the weighted average sales price per share; the actual sales price per share ranged from $27.57 to $28.09. The reporting person undertakes to provide to NetScout Systems, Inc., any security holder of NetScout Systems, 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 range set forth in this footnote (2) to this Form 4.

F1 · acquired: The shares of Common Stock were sold pursuant to a 10b5-1 plan.

SEC source: 0000899243-18-024535 · doc4.xml · derivative · entry 3

SPRADLEY SUSAN LOUISE · CIK 0001235896 · Director

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 7,000

Underlying: Common Stock · 7,000 shares

Expires not disclosed

F2 · derivative.exercise_price: Price is N/A.

F2 · price: Price is N/A.

F4 · derivative.exercise_date: All of the Restricted Stock Units vest on the date of the Company's Annual Meeting to occur in 2019, provided that during the period from the date of grant through the date of such Annual Meeting, the reporting person attends at least 75% of the meetings, collectively, of the Board and any committee of the Board of which the reporting person is a member. In the event that the attendance requirements are not met, the Restricted Stock Units will not become vested until 09/12/2021.

F3 · derivative.expiration_date: Date is N/A.

SEC source: 0000899243-18-024535 · doc4.xml · derivative · entry 2

SPRADLEY SUSAN LOUISE · CIK 0001235896 · Director

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 0

Underlying: Common Stock · 2,000 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.

F2 · derivative.exercise_price: Price is N/A.

F2 · price: Price is N/A.

F3 · derivative.expiration_date: Date is N/A.

SEC source: 0000899243-18-024535 · doc4.xml · nonDerivative · entry 1

SPRADLEY SUSAN LOUISE · CIK 0001235896 · Director

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 2,000

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 · kind: The shares of Common Stock were acquired upon the vesting of certain restricted stock units previously granted to the reporting person.

F2 · price: Price is N/A.

F1 · acquired: The shares of Common Stock were acquired upon the vesting of certain restricted stock units previously granted to the reporting person.

SEC source: 0000899243-18-024536 · doc4.xml · derivative · entry 3

Perretta Christopher · CIK 0001570744 · Director

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 7,000

Underlying: Common Stock · 7,000 shares

Expires not disclosed

F2 · derivative.exercise_price: Price is N/A.

F2 · price: Price is N/A.

F4 · derivative.exercise_date: All of the Restricted Stock Units vest on the date of the Company's Annual Meeting to occur in 2019, provided that during the period from the date of grant through the date of such Annual Meeting, the reporting person attends at least 75% of the meetings, collectively, of the Board and any committee of the Board of which the reporting person is a member. In the event that the attendance requirements are not met, the Restricted Stock Units will not become vested until 09/12/2021.

F3 · derivative.expiration_date: Date is N/A.

SEC source: 0000899243-18-024536 · doc4.xml · derivative · entry 2

Perretta Christopher · CIK 0001570744 · Director

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 0

Underlying: Common Stock · 4,236 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.

F2 · derivative.exercise_price: Price is N/A.

F2 · price: Price is N/A.

F3 · derivative.expiration_date: Date is N/A.

SEC source: 0000899243-18-024536 · doc4.xml · nonDerivative · entry 1

Perretta Christopher · CIK 0001570744 · Director

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 13,771

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 · kind: The shares of Common Stock were acquired upon the vesting of certain restricted stock units previously granted to the reporting person.

F2 · price: Price is N/A.

F1 · acquired: The shares of Common Stock were acquired upon the vesting of certain restricted stock units previously granted to the reporting person.

SEC source: 0000899243-18-024534 · doc4.xml · derivative · entry 2

LICO JAMES A · CIK 0001210231 · Director

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 0

Underlying: Common Stock · 4,236 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.

F2 · derivative.exercise_price: Price is N/A.

F2 · price: Price is N/A.

F3 · derivative.expiration_date: Date is N/A.

SEC source: 0000899243-18-024534 · doc4.xml · nonDerivative · entry 1

LICO JAMES A · CIK 0001210231 · Director

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 16,978

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 · kind: The shares of Common Stock were acquired upon the vesting of certain restricted stock units previously granted to the reporting person.

F2 · price: Price is N/A.

F1 · acquired: The shares of Common Stock were acquired upon the vesting of certain restricted stock units previously granted to the reporting person.

SEC source: 0000899243-18-024533 · doc4.xml · derivative · entry 3

DONAHUE ROBERT E · CIK 0001276013 · Director

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 7,000

Underlying: Common Stock · 7,000 shares

Expires not disclosed

F2 · derivative.exercise_price: Price is N/A.

F2 · price: Price is N/A.

F4 · derivative.exercise_date: All of the Restricted Stock Units vest on the date of the Company's Annual Meeting to occur in 2019, provided that during the period from the date of grant through the date of such Annual Meeting, the reporting person attends at least 75% of the meetings, collectively, of the Board and any committee of the Board of which the reporting person is a member. In the event that the attendance requirements are not met, the Restricted Stock Units will not become vested until 09/12/2021.

F3 · derivative.expiration_date: Date is N/A.

SEC source: 0000899243-18-024533 · doc4.xml · derivative · entry 2

DONAHUE ROBERT E · CIK 0001276013 · Director

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 0

Underlying: Common Stock · 4,236 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.

F2 · derivative.exercise_price: Price is N/A.

F2 · price: Price is N/A.

F3 · derivative.expiration_date: Date is N/A.

SEC source: 0000899243-18-024533 · doc4.xml · nonDerivative · entry 1

DONAHUE ROBERT E · CIK 0001276013 · Director

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 17,977

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 · kind: The shares of Common Stock were acquired upon the vesting of certain restricted stock units previously granted to the reporting person.

F2 · price: Price is N/A.

F1 · acquired: The shares of Common Stock were acquired upon the vesting of certain restricted stock units previously granted to the reporting person.

SEC source: 0000899243-18-024532 · doc4.xml · derivative · entry 3

Grasso Alfred · CIK 0001738443 · Director

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 7,000

Underlying: Common Stock · 7,000 shares

Expires not disclosed

F2 · derivative.exercise_price: Price is N/A.

F2 · price: Price is N/A.

F4 · derivative.exercise_date: All of the Restricted Stock Units vest on the date of the Company's Annual Meeting to occur in 2019, provided that during the period from the date of grant through the date of such Annual Meeting, the reporting person attends at least 75% of the meetings, collectively, of the Board and any committee of the Board of which the reporting person is a member. In the event that the attendance requirements are not met, the Restricted Stock Units will not become vested until 09/12/2021.

F3 · derivative.expiration_date: Date is N/A.

SEC source: 0000899243-18-024532 · doc4.xml · derivative · entry 2

Grasso Alfred · CIK 0001738443 · Director

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 0

Underlying: Common Stock · 2,000 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.

F2 · derivative.exercise_price: Price is N/A.

F2 · price: Price is N/A.

F3 · derivative.expiration_date: Date is N/A.

SEC source: 0000899243-18-024532 · doc4.xml · nonDerivative · entry 1

Grasso Alfred · CIK 0001738443 · Director

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 2,000

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 · kind: The shares of Common Stock were acquired upon the vesting of certain restricted stock units previously granted to the reporting person.

F2 · price: Price is N/A.

F1 · acquired: The shares of Common Stock were acquired upon the vesting of certain restricted stock units previously granted to the reporting person.

SEC source: 0000899243-18-024531 · doc4.xml · derivative · entry 3

MULLARKEY VINCENT J · CIK 0001233501 · Director

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 7,000

Underlying: Common Stock · 7,000 shares

Expires not disclosed

F2 · derivative.exercise_price: Price is N/A.

F2 · price: Price is N/A.

F4 · derivative.exercise_date: All of the Restricted Stock Units vest on the date of the Company's Annual Meeting to occur in 2019, provided that during the period from the date of grant through the date of such Annual Meeting, the reporting person attends at least 75% of the meetings, collectively, of the Board and any committee of the Board of which the reporting person is a member. In the event that the attendance requirements are not met, the Restricted Stock Units will not become vested until 09/12/2021.

F3 · derivative.expiration_date: Date is N/A.

SEC source: 0000899243-18-024531 · doc4.xml · derivative · entry 2

MULLARKEY VINCENT J · CIK 0001233501 · Director

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 0

Underlying: Common Stock · 4,236 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.

F2 · derivative.exercise_price: Price is N/A.

F2 · price: Price is N/A.

F3 · derivative.expiration_date: Date is N/A.

SEC source: 0000899243-18-024531 · doc4.xml · nonDerivative · entry 1

MULLARKEY VINCENT J · CIK 0001233501 · Director

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 14,383

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 · kind: The shares of Common Stock were acquired upon the vesting of certain restricted stock units previously granted to the reporting person.

F2 · price: Price is N/A.

F1 · acquired: The shares of Common Stock were acquired upon the vesting of certain restricted stock units previously granted to the reporting person.

SEC source: 0000899243-18-024530 · doc4.xml · derivative · entry 3

EGAN JOHN R · CIK 0001189174 · Director

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 7,000

Underlying: Common Stock · 7,000 shares

Expires not disclosed

F2 · derivative.exercise_price: Price is N/A.

F2 · price: Price is N/A.

F4 · derivative.exercise_date: All of the Restricted Stock Units vest on the date of the Company's Annual Meeting to occur in 2019, provided that during the period from the date of grant through the date of such Annual Meeting, the reporting person attends at least 75% of the meetings, collectively, of the Board and any committee of the Board of which the reporting person is a member. In the event that the attendance requirements are not met, the Restricted Stock Units will not become vested until 09/12/2021.

F3 · derivative.expiration_date: Date is N/A

SEC source: 0000899243-18-024530 · doc4.xml · derivative · entry 2

EGAN JOHN R · CIK 0001189174 · Director

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 0

Underlying: Common Stock · 4,236 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.

F2 · derivative.exercise_price: Price is N/A.

F2 · price: Price is N/A.

F3 · derivative.expiration_date: Date is N/A

SEC source: 0000899243-18-024530 · doc4.xml · nonDerivative · entry 1

EGAN JOHN R · CIK 0001189174 · Director

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 81,740

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 · kind: The shares of Common Stock were acquired upon the vesting of certain restricted stock units previously granted to the reporting person.

F2 · price: Price is N/A.

F1 · acquired: The shares of Common Stock were acquired upon the vesting of certain restricted stock units previously granted to the reporting person.

SEC source: 0000899243-18-024528 · doc4.xml · derivative · entry 3

HADZIMA JOSEPH G JR · CIK 0001232881 · Director

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 7,000

Underlying: Common Stock · 7,000 shares

Expires not disclosed

F2 · derivative.exercise_price: Price is N/A.

F2 · price: Price is N/A.

F4 · derivative.exercise_date: All of the Restricted Stock Units vest on the date of the Company's Annual Meeting to occur in 2019, provided that during the period from the date of grant through the date of such Annual Meeting, the reporting person attends at least 75% of the meetings, collectively, of the Board and any committee of the Board of which the reporting person is a member. In the event that the attendance requirements are not met, the Restricted Stock Units will not become vested until 09/12/2021.

F3 · derivative.expiration_date: Date is N/A.

SEC source: 0000899243-18-024528 · doc4.xml · derivative · entry 2

HADZIMA JOSEPH G JR · CIK 0001232881 · Director

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 0

Underlying: Common Stock · 4,236 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.

F2 · derivative.exercise_price: Price is N/A.

F2 · price: Price is N/A.

F3 · derivative.expiration_date: Date is N/A.

SEC source: 0000899243-18-024528 · doc4.xml · nonDerivative · entry 1

HADZIMA JOSEPH G JR · CIK 0001232881 · Director

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 120,798

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 · kind: The shares of Common Stock were acquired upon the vesting of certain restricted stock units previously granted to the reporting person.

F2 · price: Price is N/A.

F1 · acquired: The shares of Common Stock were acquired upon the vesting of certain restricted stock units previously granted to the reporting person.

SEC source: 0000899243-18-024190 · doc4.xml · nonDerivative · entry 1

MULLARKEY VINCENT J · CIK 0001233501 · Director

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 10,147

F1 · price: The shares sold on this date were sold in multiple transactions. This price is the weighted average sales price per share; the actual sales price per share ranged from $24.65 to $25.05 The reporting person undertakes to provide to NetScout Systems, Inc., any security holder of NetScout Systems, 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 range set forth in this footnote (1) to this Form 4.