William Blair trims Mercury Systems stake to 9.9%

TL;DR

**William Blair still owns 9.9% of Mercury Systems, a slight trim but still a big vote of confidence.**

AI Summary

William Blair Investment Management, LLC, a Delaware-based investment firm, has filed an Amendment No. 4 to its Schedule 13G for Mercury Systems Inc. As of December 31, 2023, William Blair beneficially owns 5,752,122 shares of Mercury Systems' Common Stock, representing 9.9% of the company. This filing indicates a significant, but slightly reduced, passive ownership stake, which matters to investors as it shows a major institutional investor's continued confidence, albeit with a minor adjustment, in Mercury Systems.

Why It Matters

This filing shows that a major institutional investor, William Blair, still holds a significant portion of Mercury Systems, signaling their continued belief in the company's value, even after a slight reduction in their stake.

Risk Assessment

Risk Level: low — This filing is an update to a passive investment, indicating no immediate major changes or activist intentions that would introduce high risk.

Analyst Insight

A smart investor would note William Blair's continued, albeit slightly reduced, significant stake in Mercury Systems as a sign of ongoing institutional confidence. This could warrant further research into Mercury Systems' fundamentals and future prospects, especially if considering buying or holding the stock.

Key Numbers

• 5,752,122 — Shares Beneficially Owned (Represents William Blair Investment Management, LLC's sole voting power in Mercury Systems Inc. as of December 31, 2023.)
• 9.9% — Percentage of Class (This is the percentage of Mercury Systems Inc.'s Common Stock beneficially owned by William Blair Investment Management, LLC, indicating a significant institutional stake.)
• December 31, 2023 — Date of Event (This is the specific date that triggered the requirement for William Blair Investment Management, LLC to file this Schedule 13G/A amendment.)

Key Players & Entities

• William Blair Investment Management, LLC (company) — the reporting person and institutional investor
• Mercury Systems Inc (company) — the issuer of the securities
• Delaware (company) — place of organization for William Blair Investment Management, LLC
• 5,752,122 (dollar_amount) — number of shares beneficially owned by William Blair
• 9.9% (dollar_amount) — percentage of class beneficially owned by William Blair
• December 31, 2023 (date) — date of event requiring the filing

Forward-Looking Statements

• William Blair Investment Management, LLC will maintain a significant, passive stake in Mercury Systems Inc. for the foreseeable future. (William Blair Investment Management, LLC) — medium confidence, target: December 31, 2024

FAQ

Filing Documents

• tm245766d3_sc13ga.htm (SC 13G/A) — 57KB
• 0001104659-24-014969.txt ( ) — 58KB

(a)

Item 1(a). Name of Issuer: Mercury Systems Inc

(b)

Item 1(b). Address of Issuer’s Principal Executive Offices: 50 Minuteman Road, Andover, MA 01810

(a)

Item 2(a). Name of Person Filing: William Blair Investment Management, LLC

(b)

Item 2(b). Address of Principal Business Office or, if none, Residence: 150 North Riverside Plaza, Chicago, IL 60606

(c)

Item 2(c). Citizenship: Delaware

(d)

Item 2(d). Title of Class of Securities: Common Stock

(e)

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) o Broker or dealer registered under Section 15 of the Act (15 U.S.C. 78o); (b) o Bank as defined in Section 3(a)(6) of the Act (15 U.S.C. 78c); (c) o Insurance company as defined in Section 3(a)(19) of the Act (15 U.S.C. 78c); (d) o Investment company registered under Section 8 of the Investment Company Act of 1940 (15 U.S.C. 80a-8); (e) x An investment adviser in accordance with § 240.13d-1(b)(1)(ii)(E); (f) o An employee benefit plan or endowment fund in accordance with § 240.13d-1(b)(1)(ii)(F); (g) o A parent holding company or control person in accordance with § 240.13d-1(b)(1)(ii)(G); (h) o A savings association as defined in Section 3(b) of the Federal Deposit Insurance Act (12 U.S.C. 1813); (i) o 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) o A non-U.S. institution in accordance with § 240.13d-1(b)(1)(ii)(J); (k) o 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: 6,556,772 (b) Percent of class: 11.1% (c) Number of shares as to which the person has: (i) Sole power to vote or to direct the vote: 5,752,122 (ii) Shared power to vote or to direct the vote: 0 (iii) Sole power to dispose or to direct the disposition of: 6,556,772 (iv) Shared power to dispose or to direct the disposition of: 0 Item 5.

View Full Filing

View this SC 13G/A filing on SEC EDGAR