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of Contents](#toc_page)\n\n \n\n \n\n \n\nUNITED STATES\n\nSECURITIES AND EXCHANGE COMMISSION\n\nWashington, D.C. 20549\n\n \n\n \n\nFORM 10-K\n\n \n\n(Mark One)\n\n☒\n\nANNUAL REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934\n\nFor the fiscal year ended March 31, 2026\n\nOR\n\n☐\n\nTRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934\n\n \n\nFor the transition period from to\n\nCommission file number 000-26251\n\n \n\n \n\nNETSCOUT SYSTEMS, INC.\n\n(Exact name of registrant as specified in its charter)\n\nDelaware\n\n04-2837575\n\n(State or other jurisdiction of\n\nincorporation or organization)\n\n(IRS Employer\n\nIdentification No.)\n\n310 Littleton Road, Westford, MA 01886\n\n(978) 614-4000\n\n \n\n \n\nSecurities registered pursuant to Section 12(b) of the Act:\n\n \n\nTitle of each class\n\nTrading Symbol(s)\n\nName of each exchange on which registered:\n\nCommon Stock, $0.001 par value per share\n\nNTCT\n\nNasdaq Global Select Market\n\n \n\nSecurities registered pursuant to Section 12(g) of the Act: None\n\nIndicate by check mark if the registrant is a well-known seasoned issuer, as defined in Rule 405 of the Securities Act. Yes x No ¨\n\nIndicate by check mark if the registrant is not required to file reports pursuant to Section 13 or Section 15(d) of the Act. Yes ¨ No x\n\nIndicate by check mark whether the registrant: (1) has filed all reports required to be filed by Section 13 or 15(d) of the Securities Exchange Act of 1934 during the preceding 12 months (or for such shorter period that the registrant was required to file such reports), and (2) has been subject to such filing requirements for the past 90 days. Yes ☒ No ☐\n\nIndicate by check mark whether the registrant has submitted electronically every Interactive Data File required to be submitted pursuant to Rule 405 of Regulation S-T (§ 232.405 of this chapter) during the preceding 12 months (or for such shorter period that the registrant was required to submit such files). Yes ☒ No ☐\n\nIndicate by check mark whether the registrant is a large accelerated filer, an accelerated filer, a non-accelerated filer, a smaller reporting company, or an emerging growth company. See the definitions of \"large accelerated filer,\" \"accelerated filer,\" \"smaller reporting company,\" and \"emerging growth company\" in Rule 12b-2 of the Exchange Act. (Check one):\n\n \n\n \n\nLarge accelerated filer\n\n☒\n\n \n\nAccelerated filer\n\n☐\n\n \n\n \n\nNon-accelerated filer\n\n☐\n\n \n\nSmaller reporting company\n\n☐\n\n \n\n \n\n \n\n \n\n \n\nEmerging growth company\n\n☐\n\n \n\n \n\nIf an emerging growth company, indicate by check mark if the registrant has elected not to use the extended transition period for complying with any new or revised financial accounting standards provided pursuant to Section 13(a) of the Exchange Act. ☐\n\nIndicate by check mark whether the registrant has filed a report on and attestation to its management's assessment of the effectiveness of its internal control over financial reporting under Section 404(b) of the Sarbanes-Oxley Act (15 U.S.C. 7262(b)) by the registered public accounting firm that prepared or issued its audit report.☒\n\nIf securities are registered pursuant to Section 12(b) of the Act, indicate by check mark whether the financial statements of the registrant included in the filing reflect the correction of an error to previously issued financial statements. ☐\n\nIndicate by check mark whether any of those error corrections are restatements that required a recovery analysis of incentive-based compensation received by any of the registrant’s executive officers during the relevant recovery period pursuant to § 240.10D-1(b). ☐\n\nIndicate by check mark whether the registrant is a shell company (as defined in Rule 12b-2 of the Exchange Act). YES ☐ NO ☒\n\nThe aggregate market value of common stock held by non-affiliates of the registrant as of September 30, 2025 (based on the last reported sale price on the Nasdaq Global Select Market as of such date) was approximately $1,798,552,586. As of May 7, 2026, there were 71,495,215 shares of the registrant's common stock outstanding.\n\nDOCUMENTS INCORPORATED BY REFERENCE\n\nPortions of the registrant's definitive Proxy Statement for the 2026 Annual Meeting of Stockholders to be filed with the U.S. Securities and Exchange Commission pursuant to Regulation 14A not later than 120 days after the end of the fiscal year covered by this Annual Report on Form 10-K are incorporated by reference in Part III, Items 10-14 of this Annual Report on Form 10-K.\n\n \n\n[Table of Contents](#toc_page)\n\n \n\n \n\nNETSCOUT SYSTEMS, INC.\n\nFORM 10-K\n\nFOR THE FISCAL YEAR ENDED MARCH 31, 2026\n\nTABLE OF CONTENTS\n\n \n\nPART I"}