Table of Contents UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-K (Mark One) ☒ ANNUAL REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the fiscal year ended March 31, 2020 OR ☐ TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the transition period from to Commission file number 000-26251 NETSCOUT SYSTEMS, INC. (Exact name of registrant as specified in its charter) (State or other jurisdiction of in ...

Netscout Systems, Inc. (NASDAQ:NTCT) Q4 2020 Earnings Conference Call May 7, 2020 8:30 AM ET Company Participants Anthony Piazza - VP, Corporate Finance Anil Singhal - Co-Founder, Chairman, President & CEO Michael Szabados - Vice Chairman & COO Jean Bua - EVP, CFO, CAO & Treasurer Conference Call Participants Matthew Hedberg - RBC Capital Markets Eric Martinuzzi - Lake Street Capital Markets Chad Bennett - Craig-Hallum Capital Group Kevin Liu - K. Liu & Company James Fish - Piper Sandler & Co. Operator Ladi ...

Table of Contents UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, DC 20549 FORM 10-Q (Mark One) ☒ QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the quarterly period ended December 31, 2019 OR ☐ TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the transition period from to Commission file number 000-26251 NETSCOUT SYSTEMS, INC. (Exact Name of Registrant as Specified in Its Charter) (State or Other Jurisdict ...

Table of Contents UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, DC 20549 FORM 10-Q (Mark One) ☒ QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the quarterly period ended September 30, 2019 OR ☐ TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the transition period from to Commission file number 000-26251 NETSCOUT SYSTEMS, INC. (Exact Name of Registrant as Specified in Its Charter) (State or Other Jurisdic ...

Table of Contents UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, DC 20549 FORM 10-Q (Mark One) ☒ QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the quarterly period ended June 30, 2019 OR ☐ TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the transition period from to Commission file number 000-26251 NETSCOUT SYSTEMS, INC. (Exact Name of Registrant as Specified in Its Charter) (State or Other Jurisdiction ...

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-K (Mark One) x ANNUAL REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the fiscal year ended March 31, 2019 OR ¨ TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the transition period from to Commission file number 000-26251 NETSCOUT SYSTEMS, INC. (Exact name of registrant as specified in its charter) (State or other jurisdiction of incorporation or org ...

Table of Contents Washington, DC 20549 FORM 10-Q (Mark One) x QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the quarterly period ended December 31, 2018 OR ¨ TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the transition period from to Commission file number 000-26251 NETSCOUT SYSTEMS, INC. UNITED STATES SECURITIES AND EXCHANGE COMMISSION (Exact Name of Registrant as Specified in Its Charter) (State or Other Jurisdict ...