SCHEDULE 14A INFORMATION

Proxy Statement Pursuant to Section 14(a) of the

Securities Exchange Act of 1934

Filed by the Registrant  ☒                            Filed by a Party other than the Registrant  ☐

Check the appropriate box:

☐	Preliminary Proxy Statement
☐	Confidential, For Use of the Commission Only (as permitted by Rule 14a-6(e)(2))
☐	Definitive Proxy Statement
☒	Definitive Additional Materials
☐	Soliciting Material Under Rule 14a-12

NETSCOUT SYSTEMS, INC.

(Name of Registrant as Specified in Its Charter)

(Name of Person(s) Filing Proxy Statement, if Other Than the Registrant)

Payment of Filing Fee (Check the appropriate box):

☒	No fee required.
☐	Fee computed on table below per Exchange Act Rules 14a-6(i)(1) and 0-11.
	(1)	Title of each class of securities to which transaction applies:
		Not Applicable
	(2)	Aggregate number of securities to which transaction applies:
		Not Applicable
	(3)	Per unit price or other underlying value of transaction computed pursuant to Exchange Act Rule 0-11 (set forth the amount on which the filing fee is calculated and state how it was determined):
		Not Applicable
	(4)	Proposed maximum aggregate value of transaction:
		Not Applicable
	(5)	Total fee paid:
		Not Applicable
☐	Fee paid previously with preliminary materials.
☐	Check box if any part of the fee is offset as provided by Exchange Act Rule 0-11(a)(2) and identify the filing for which the offsetting fee was paid previously. Identify the previous filing by registration statement number, or the form or schedule and the date of its filing.
	(1)	Amount previously paid:
		Not Applicable
	(2)	Form, Schedule or Registration Statement No.:
		Not Applicable
	(3)	Filing Party:
		Not Applicable
	(4)	Date Filed:
		Not Applicable

www.investorvote.com/NTCT Step 1: Go to www.investorvote.com/NTCT. Step 2: Click on the icon on the right to view current meeting materials. Step 3: Return to the investorvote.com window and follow the instructions on the screen to log in. Vote by Internet • Go to www.investorvote.com/NTCT • Or scan the QR code with your smartphone • Follow the steps outlined on the secure website Stockholder Meeting Notice 02NCTD + + Important Notice Regarding the Availability of Proxy Materials for the NetScout Systems, Inc. Annual Meeting of Stockholders to be Held on September 19, 2017 Under Securities and Exchange Commission rules, you are receiving this notice that the proxy materials for the annual shareholders’ meeting are available on the Internet. Follow the instructions below to view the materials and vote online or request a copy. The items to be voted on and location of the annual meeting are on the reverse side. Your vote is important! This communication presents only an overview of the more complete proxy materials that are available to you on the Internet. We encourage you to access and review all of the important information contained in the proxy materials before voting. The proxy statement, form of proxy, annual report to shareholders and directions to the annual meeting are available at: _ Easy Online Access — A Convenient Way to View Proxy Materials and Vote When you go online to view materials, you can also vote your shares. Step 4: Make your selection as instructed on each screen to select delivery preferences and vote. When you go online, you can also help the environment by consenting to receive electronic delivery of future materials. Obtaining a Copy of the Proxy Materials – If you want to receive a copy of these documents, you must request one. There is no charge to you for requesting a copy. Please make your request for a copy as instructed on the reverse side on or before 10 days before the meeting to facilitate timely delivery. . IMPORTANT ANNUAL MEETING INFORMATION 2 N O T

Here’s how to order a copy of the proxy materials and select a future delivery preference: Paper copies: Current and future paper delivery requests can be submitted via the telephone, Internet or email options below. Email copies: Current and future email delivery requests must be submitted via the Internet following the instructions below. If you request an email copy of current materials you will receive an email with a link to the materials. PLEASE NOTE: You must use the number in the shaded bar on the reverse side when requesting a set of proxy materials. g Internet – Go to www.investorvote.com/NTCT. Follow the instructions to log in and order a copy of the current meeting materials and submit your preference for email or paper delivery of future meeting materials. g Telephone – Call us free of charge at 1-866-641-4276 and follow the instructions to log in and order a paper copy of the materials by mail for the current meeting. You can also submit a preference to receive a paper copy for future meetings. g Email – Send email to investorvote@computershare.com with “Proxy Materials NetScout Systems, Inc.” in the subject line. Include in the message your full name and address, plus the number located in the shaded bar on the reverse, and state in the email that you want a paper copy of current meeting materials. You can also state your preference to receive a paper copy for future meetings. To facilitate timely delivery, all requests for a paper copy of the proxy materials must be received by 10 days before the meeting. . Stockholder Meeting Notice NetScout Systems, Inc. Annual Meeting of Stockholders will be held on September 19, 2017 at NetScout Systems, Inc., 310 Littleton Road, Westford, Massachusetts, at 10:00 a.m. local time. Proposals to be voted on at the meeting are listed below along with the Board of Directors’ recommendations. The Board of Directors recommends a vote FOR all nominees and FOR PROPOSALS 2 AND 3, AND “1 YEAR” FOR PROPOSAL 4: 1. To elect two Class III directors nominated by our Board to the Board of Directors to serve until the 2020 Annual Meeting of Stockholders or until their successors are duly elected and qualified. 01 - Joseph G. Hadzima, Jr., 02 - Christopher Perretta 2. To ratify the selection of PricewaterhouseCoopers LLP to serve as our independent registered public accounting firm for the fiscal year ending March 31, 2018. 3. To approve, on an advisory basis, the compensation of our named executive officers, as disclosed in the proxy statement in accordance with Securities and Exchange Commission rules. 4. To determine, on an advisory basis, the preferred frequency of stockholder advisory votes (every year - 1 Year, every other year - 2 Years, or once every three years - 3 Years) on the compensation of our named executive officers, in accordance with Securities and Exchange Commission rules. Note: Your proxy holder will also vote on any other business properly brought before the Annual Meeting. PLEASE NOTE – YOU CANNOT VOTE BY RETURNING THIS NOTICE. To vote your shares you must vote online or request a paper copy of the proxy materials to receive a proxy card. If you wish to attend and vote at the meeting, please bring this notice with you. 02NCTD