[144] Spok Holdings, Inc SEC Filing

Rhea-AI Filing Summary

Massachusetts Financial Services Company ("MFS") has filed a Schedule 13G disclosing a 5.1 % ownership stake in Plains GP Holdings, L.P. (PAGP) as of 30 June 2025. The position totals 10,117,959 common shares (CUSIP 72651A207).

MFS, organized in Delaware and headquartered at 111 Huntington Ave., Boston, MA, reports it is filing under Rule 13d-1(b) in its capacity as an investment adviser ("IA"). The firm holds

• Sole voting power: 10,094,822 shares
• Sole dispositive power: 10,117,959 shares
• Shared voting/dispositive power: 0 shares

No subsidiary or group relationships are identified, and MFS certifies the shares were acquired in the ordinary course of business, not to influence control of PAGP.

This disclosure signals a sizeable institutional presence but does not announce any transactional intent or strategic partnership. The filing is signed by Compliance Officer Lisa Neaves on 4 Aug 2025.

Positive

• MFS’s 5.1 % stake introduces a well-known institutional investor to PAGP’s register, potentially signalling external confidence in the company.

Negative

• None.

Insights

Financial Analyst

TL;DR: MFS now owns 5.1 % of PAGP, a routine but notable institutional stake; no control intent stated.

The 13G simply reveals that MFS, a registered investment adviser, crossed the 5 % reporting threshold, acquiring just over 10.1 million PAGP shares. All voting and dispositive powers are held solely by MFS, with no shared arrangements, suggesting a straightforward portfolio investment. Because the filing lacks any activist language and explicitly disclaims control ambitions, the market impact is likely neutral unless further accumulation or activism occurs. Investors may view the presence of a reputable institutional manager as modestly supportive, but the disclosure alone does not alter the investment thesis on PAGP.

Form 144 Filer Information	UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Form 144 NOTICE OF PROPOSED SALE OF SECURITIES PURSUANT TO RULE 144 UNDER THE SECURITIES ACT OF 1933
FORM 144

144: Filer Information

Filer CIK
Filer CCC
Is this a LIVE or TEST Filing?	LIVE TEST
Submission Contact Information
Name
Phone
E-Mail Address

144: Issuer Information

Name of Issuer

SEC File Number

Address of Issuer

Phone

Name of Person for Whose Account the Securities are To Be Sold

See the definition of "person" in paragraph (a) of Rule 144. Information is to be given not only as to the person for whose account the securities are to be sold but also as to all other persons included in that definition. In addition, information shall be given as to sales by all persons whose sales are required by paragraph (e) of Rule 144 to be aggregated with sales for the account of the person filing this notice.

Relationship to Issuer

144: Securities Information

Title of the Class of Securities To Be Sold	Name and Address of the Broker	Number of Shares or Other Units To Be Sold	Aggregate Market Value	Number of Shares or Other Units Outstanding	Approximate Date of Sale	Name the Securities Exchange
Common Stock, par value $0.0001 per share	Goldman Sachs & Co. LLC 200 West Street New York NY 10282	147885	2737351.35	20590924	08/04/2025	NASDAQ

Furnish the following information with respect to the acquisition of the securities to be sold and with respect to the payment of all or any part of the purchase price or other consideration therefor:

144: Securities To Be Sold

Title of the Class	Date you Acquired	Nature of Acquisition Transaction	Name of Person from Whom Acquired	Is this a Gift?	Date Donor Acquired	Amount of Securities Acquired	Date of Payment	Nature of Payment *
Common Stock, par value $0.0001 per share	03/16/2023	Purchases of shares of Common Stock in the open market	Purchases from counterparties in open market transactions (2)			147885	03/16/2023	Cash

* If the securities were purchased and full payment therefor was not made in cash at the time of purchase, explain in the table or in a note thereto the nature of the consideration given. If the consideration consisted of any note or other obligation, or if payment was made in installments describe the arrangement and state when the note or other obligation was discharged in full or the last installment paid.

Furnish the following information as to all securities of the issuer sold during the past 3 months by the person for whose account the securities are to be sold.

144: Securities Sold During The Past 3 Months

Nothing to Report

144: Remarks and Signature

Remarks

Date of Notice

ATTENTION:

The person for whose account the securities to which this notice relates are to be sold hereby represents by signing this notice that he does not know any material adverse information in regard to the current and prospective operations of the Issuer of the securities to be sold which has not been publicly disclosed. If such person has adopted a written trading plan or given trading instructions to satisfy Rule 10b5-1 under the Exchange Act, by signing the form and indicating the date that the plan was adopted or the instruction given, that person makes such representation as of the plan adoption or instruction date.

Signature

ATTENTION: Intentional misstatements or omission of facts constitute Federal Criminal Violations (See 18 U.S.C. 1001)

FAQ

How many Plains GP Holdings (PAGP) shares does MFS own?

10,117,959 common shares, according to the Schedule 13G.

What percentage of PAGP’s outstanding stock is held by MFS?

MFS reports beneficial ownership of 5.1 % of the class.

Does MFS share voting or dispositive power with any other party?

No. The filing states sole voting power over 10,094,822 shares and sole dispositive power over 10,117,959 shares; shared power is 0.

Under which rule was this Schedule 13G filed?

It was filed pursuant to Rule 13d-1(b) as MFS is an investment adviser.

Is MFS seeking control of Plains GP Holdings?

No. The certification specifies the shares were acquired in the ordinary course of business and not for the purpose of influencing control.