SC 13G/A: MERCURY SYSTEMS INC

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SC 13G/A filing by MERCURY SYSTEMS INC.

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Risk Level: low

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Filing Documents

• tm2428293d1_sc13ga.htm (SC 13G/A) — 48KB
• 0001104659-24-118534.txt ( ) — 50KB

From the Filing

SC 13G/A 1 tm2428293d1_sc13ga.htm SC 13G/A UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington , D.C. 20549 SCHEDULE 13G* (Rule 13d-102) INFORMATION TO BE INCLUDED IN STATEMENTS FILED PURSUANT TO § 240.13d-1(b), (c), AND (d) AND AMENDMENTS THERETO FILED PURSUANT TO § 240.13d-2 (Amendment No. 5)* Mercury Systems Inc (Name of Issuer) Common Stock (Title of Class of Securities) 589378108 (CUSIP Number) September 30, 2024 (Date of Event Which Requires Filing of the Statement) Check the appropriate box to designate the rule pursuant to which this Schedule is filed: Rule 13d-1(b) Rule 13d-1(c) Rule 13d-1(d) *The remainder of this cover page shall be filled out for a reporting person’s initial filing on this form with respect to the subject class of securities, and for any subsequent amendment containing information which would alter the disclosures provided in a prior cover page. The information required in the remainder of this cover page shall not be deemed to be “filed” for the purpose of Section 18 of the Securities Exchange Act of 1934 (“Act”) or otherwise subject to the liabilities of that section of the Act but shall be subject to all other provisions of the Act (however, see the Notes). CUSIP: 589378108 Page 2 1. NAME OF REPORTING PERSONS William Blair Investment Management, LLC 2. CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP (see instructions) (a) (b) 3. SEC USE ONLY 4. CITIZENSHIP OR PLACE OF ORGANIZATION Delaware NUMBER OF SHARES BENEFICIALLY OWNED BY EACH REPORTING PERSON WITH 5. SOLE VOTING POWER 6,585,904 6. SHARED VOTING POWER 0 7. SOLE DISPOSITIVE POWER 7,299,512 8. SHARED DISPOSITIVE POWER 0 9. AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON 7,299,512 10. CHECK IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES (SEE INSTRUCTIONS) 11. PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (9) 12.3% 12. TYPE OF REPORTING PERSON (SEE INSTRUCTIONS) IA CUSIP: 589378108 Page 3 Item 1(a). Name of Issuer: Mercury Systems Inc Item 1(b). Address of Issuer’s Principal Executive Offices: 50 Minuteman Road, Andover, MA 01810 Item 2(a). Name of Person Filing: William Blair Investment Management, LLC Item 2(b). Address of Principal Business Office or, if none, Residence: 150 North Riverside Plaza, Chicago, IL 60606 Item 2(c). Citizenship: Delaware Item 2(d). Title of Class of Securities: Common Stock Item 2(e). CUSIP Number: 589378108 Item 3. If this statement is filed pursuant to §§ 240.13d-1(b), or 240.13d-2(b) or (c), check whether the person filing is a: (a) Broker or dealer registered under Section 15 of the Act (15 U.S.C. 78o); (b) Bank as defined in Section 3(a)(6) of the Act (15 U.S.C. 78c); (c) Insurance company as defined in Section 3(a)(19) of the Act (15 U.S.C. 78c); (d) Investment company registered under Section 8 of the Investment Company Act of 1940 (15 U.S.C. 80a-8); (e) An investment adviser in accordance with § 240.13d-1(b)(1)(ii)(E); (f) An employee benefit plan or endowment fund in accordance with § 240.13d-1(b)(1)(ii)(F); (g) A parent holding company or control person in accordance with § 240.13d-1(b)(1)(ii)(G); (h) A savings association as defined in Section 3(b) of the Federal Deposit Insurance Act (12 U.S.C. 1813); (i) A church plan that is excluded from the definition of an investment company under Section 3(c)(14) of the Investment Company Act (15 U.S.C. 80a-3); (j) A non-U.S. institution in accordance with § 240.13d-1(b)(1)(ii)(J); (k) Group, in accordance with § 240.13d-1(b)(1)(ii)(K). If filing as a non-U.S. institution in accordance with § 240.13d-1(b)(1)(ii)(J), please specify the type of institution: ____________. CUSIP: 589378108 Page 4 Item 4. Provide the following information regarding the aggregate number and percentage of the class of securities of the issuer identified in Item 1. (a) Amount beneficially owned: 7,299,512 (b) Percent of class: 12.3% (c) Number of shares as to which the person has: (i) Sole power to vote or to direct the vote: 6,585,904 (ii) Shared power to vote or to direct the vote: 0 (iii) Sole power to dispose or to direct the disposition of: 7,299,512 (iv) Shared power to dispose or to direct the disposition of: 0 Item 5. of Five Percent or Less of a Class: If this statement is being filed to report the fact that as of the date hereof the reporting person has ceased to be the beneficial Item 6. of More Than Five Percent on Behalf of Another Person: N/A Item 7. Identification and Classification of the Subsidiary Which Acquired the Security Being Reported on By the Parent Holding Company: N/A Item 8. Identification and Classification of Members of the Group: N/A Item 9. Notice of Dissolution of Group: N/A Item 10. Cert

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