SC 13G/A: ADTRAN Holdings, Inc.

AI Summary

SC 13G/A filing by ADTRAN Holdings, Inc..

Risk Assessment

Risk Level: low

Filing Documents

• tm2428293d9_sc13ga.htm (SC 13G/A) — 51KB
• 0001104659-24-118541.txt ( ) — 52KB

(a)

Item 1(a). Name of Issuer: ADTRAN Holdings Inc

(b)

Item 1(b). Address of Issuer’s Principal Executive Offices: 901 Explorer Blvd, Huntsville, AL 35806

(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: 00486H105 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: 00486H105 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: 4,873,121 (b) Percent of class: 6.2% (c) Number of shares as to which the person has: (i) Sole power to vote or to direct the vote: 3,031,837 (ii) Shared power to vote or to direct the vote: 0 (iii) Sole power to dispose or to direct the disposition of: 4,873,121 (iv) Shared power to dispose or to direct the disposition of: 0 Item 5. of Five Percent or Le

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