MacKay Shields (NINE) joint Schedule 13G: 21.98% combined ownership disclosed

Rhea-AI Filing Summary

Nine Energy Service, Inc. Schedule 13G shows MacKay Shields LLC and NYLI MacKay High Yield Corporate Bond Fund report combined beneficial ownership positions in Nine Energy Service common stock. MacKay Shields LLC reports 1,662,134 shares (11.91%) and NYLI MacKay reports 1,404,300 shares (10.07%) based on 13,950,000 shares outstanding as of March 5, 2026. The filers state they have shared voting and dispositive power under a voting agreement dated March 5, 2026; the Schedule is filed jointly and signed by the Chief Compliance Officer.

Key Figures

Shares outstanding: 13,950,000 shares MacKay Shields beneficial ownership: 1,662,134 shares MacKay Shields ownership percent: 11.91% +3 more

6 metrics

Shares outstanding 13,950,000 shares as of March 5, 2026

MacKay Shields beneficial ownership 1,662,134 shares reported on Schedule 13G

MacKay Shields ownership percent 11.91% of common stock as of March 5, 2026

NYLI MacKay Fund beneficial ownership 1,404,300 shares reported on Schedule 13G

NYLI MacKay ownership percent 10.07% of common stock as of March 5, 2026

Combined beneficial ownership 3,066,434 shares sum of listed holdings in the filing

Key Terms

Schedule 13G, Shared voting power, Beneficial ownership, Dispositive power

4 terms

Schedule 13G regulatory

"Schedule 13G shows MacKay Shields LLC and NYLI MacKay report beneficial ownership"

A Schedule 13G is a formal document that investors file with the government when they acquire a large ownership stake in a company, usually for investment purposes rather than control. It helps keep the public informed about who owns significant parts of a company's shares, which can influence how the company is managed and how investors make decisions. Filing this schedule is important for transparency and understanding the ownership landscape of publicly traded companies.

Shared voting power regulatory

"Shared Voting Power 1,662,134.00 and 1,404,300.00 reported"

Shared voting power occurs when two or more parties jointly have the right to vote or decide how a block of company shares is cast, like co-owners who must agree before moving a piece of furniture. Investors care because who controls voting rights affects board elections, major corporate decisions and takeover outcomes, and shared control can alter regulatory disclosures and the practical influence any holder has over a company’s direction and value.

Beneficial ownership financial

"Amount beneficially owned: MacKay Shields LLC - 1,662,134"

Beneficial ownership means the person or entity that actually enjoys the benefits of owning shares or other assets — such as receiving dividends, voting rights, or price gains — even if the legal title is held in another name. For investors it matters because knowing who truly controls and profits from a company reveals who can influence decisions, exposes potential conflicts of interest or hidden concentration of power, and affects transparency and risk in the stock.

Dispositive power regulatory

"Shared Dispositive Power 1,662,134.00 and 1,404,300.00"

Dispositive power is the authority to decide the final outcome of an asset, legal claim, contract, or corporate action — in effect the power to dispose of or resolve something. For investors it matters because whoever holds that authority can determine who gets paid, who controls an asset or vote, and how risks and returns are allocated; think of it like holding the key that lets you lock in the winner or loser in a deal.

AI-generated analysis. How Rhea-AI works. Not financial advice.

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Accepted by SEC EDGAR 03/31/2026 - 03:20 PM Learn about SEC filing dates

FAQ

What stake does MacKay Shields hold in NINE?

MacKay Shields LLC beneficially owns 1,662,134 shares, representing 11.91% of common stock. This percentage is calculated using 13,950,000 shares outstanding as of March 5, 2026 per the filing.

How much does NYLI MacKay High Yield Fund own in NINE?

NYLI MacKay High Yield Corporate Bond Fund beneficially owns 1,404,300 shares, equal to 10.07% of the outstanding common stock based on 13,950,000 shares as of March 5, 2026.

Do the filers have voting control over these shares?

The filers report shared voting power and shared dispositive power for the stated shares and reference a voting agreement dated March 5, 2026 that governs voting up to specified limits.

Are these holdings reported on behalf of other persons?

MacKay Shields LLC states it acts as an investment adviser to various clients and may be deemed beneficial owner of the listed shares; NYLI MacKay is a registered investment company with MacKay Shields as sub‑adviser.

Who signed the Schedule 13G for these holdings?

The filing is signed by Chris Fitzgerald, Chief Compliance Officer, on March 31, 2026, and includes a joint filing agreement executed as of March 24, 2026.

SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

SCHEDULE 13G

UNDER THE SECURITIES EXCHANGE ACT OF 1934

Nine Energy Service, Inc.

(Name of Issuer)

Common Stock

(Title of Class of Securities)

65441V200

(CUSIP Number)

03/05/2026

(Date of Event Which Requires Filing of this 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)

schemaVersion:

SCHEDULE 13G

CUSIP Number(s): 65441V200

1

Names of Reporting Persons

MacKay Shields 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 0.00
6	Shared Voting Power 1,662,134.00
7	Sole Dispositive Power 0.00
8	Shared Dispositive Power 1,662,134.00

9

Aggregate Amount Beneficially Owned by Each Reporting Person

1,662,134.00

10

Check box if the aggregate amount in row (9) excludes certain shares (See Instructions)

11

Percent of class represented by amount in row (9)

11.91 %

12

Type of Reporting Person (See Instructions)

IA

Comment for Type of Reporting Person: The reporting persons are party to a voting agreement with the Issuer dated March 5, 2026. This agreement allows the reporting persons to vote up to 10% of the total voting power of all of the outstanding voting securities of the Company on such matter as of the applicable record date after giving effect to any other voting agreement between the Company and any of its shareholders. The percentage reported herein is calculated based on 13,950,000 shares of Common Stock outstanding as of March 5, 2026.

SCHEDULE 13G

CUSIP Number(s): 65441V200

1

Names of Reporting Persons

NYLI MacKay High Yield Corporate Bond Fund

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

MASSACHUSETTS

Number of Shares Beneficially Owned by Each Reporting Person With:

5	Sole Voting Power 0.00
6	Shared Voting Power 1,404,300.00
7	Sole Dispositive Power 0.00
8	Shared Dispositive Power 1,404,300.00

9

Aggregate Amount Beneficially Owned by Each Reporting Person

1,404,300.00

10

Check box if the aggregate amount in row (9) excludes certain shares (See Instructions)

11

Percent of class represented by amount in row (9)

10.07 %

12

Type of Reporting Person (See Instructions)

IV

Comment for Type of Reporting Person: The reporting persons are party to a voting agreement with the Issuer dated March 5, 2026. This agreement allows the reporting persons to vote up to 10% of the total voting power of all of the outstanding voting securities of the Company on such matter as of the applicable record date after giving effect to any other voting agreement between the Company and any of its shareholders. The percentage reported herein is calculated based on 13,950,000 shares of Common Stock outstanding as of March 5, 2026.

SCHEDULE 13G

Item 1.
(a)	Name of issuer: Nine Energy Service, Inc.
(b)	Address of issuer's principal executive offices: 2001 KIRBY DRIVE, SUITE 200, HOUSTON, 77019
Item 2.
(a)	Name of person filing: MacKay Shields LLC NYLI MacKay High Yield Corporate Bond Fund
(b)	Address or principal business office or, if none, residence: 299 PARK AVENUE 32ND FLOOR New York, New York 10171
(c)	Citizenship: MacKay Shields LLC - Delaware NYLI MacKay High Yield Corporate Bond Fund - Massachusetts
(d)	Title of class of securities: Common Stock
(e)	CUSIP Number(s): 65441V200
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 associations 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 of 1940 (15 U.S.C. 80a-3);
(j)	A non-U.S. institution in accordance with § 240.13d-1(b)(1)(ii)(J). If filing as a non-U.S. institution in accordance with § 240.13d-1(b)(1)(ii)(J), please specify the type of institution:
(k)	Group, in accordance with Rule 240.13d-1(b)(1)(ii)(K).
Item 4.	Ownership
(a)	Amount beneficially owned: MacKay Shields LLC - 1,662,134 NYLI MacKay High Yield Corporate Bond Fund - 1,404,300
(b)	Percent of class: 21.98 %
(c)	Number of shares as to which the person has:
	(i) Sole power to vote or to direct the vote: MacKay Shields LLC - 0 NYLI MacKay High Yield Corporate Bond Fund - 0
	(ii) Shared power to vote or to direct the vote: MacKay Shields LLC - 1,662,134 NYLI MacKay High Yield Corporate Bond Fund - 1,404,300
	(iii) Sole power to dispose or to direct the disposition of: MacKay Shields LLC - 0 NYLI MacKay High Yield Corporate Bond Fund - 0
	(iv) Shared power to dispose or to direct the disposition of: MacKay Shields LLC - 1,662,134 NYLI MacKay High Yield Corporate Bond Fund - 1,404,300
Item 5.	Ownership of 5 Percent or Less of a Class.
	Not Applicable
Item 6.	Ownership of more than 5 Percent on Behalf of Another Person.
	If any other person is known to have the right to receive or the power to direct the receipt of dividends from, or the proceeds from the sale of, such securities, a statement to that effect should be included in response to this item and, if such interest relates to more than 5 percent of the class, such person should be identified. A listing of the shareholders of an investment company registered under the Investment Company Act of 1940 or the beneficiaries of employee benefit plan, pension fund or endowment fund is not required. MacKay Shields LLC, an investment advisor registered under Section 203 of the Investment Advisors Act of 1940 is deemed to be the beneficial owner of 1,662,134 shares of the 11.91% of the Common Stock believed to be outstanding as a result of acting as investment adviser to various clients. All calculations of percentage ownership are based on a total of 13,950,000 shares of Common Stock issued and outstanding as of March 5, 2026. The NYLI MacKay High Yield Corporate Bond Fund, a registered investment company for which MacKay Shields acts as a sub investment adviser, may be deemed to beneficially own 10.07% of the outstanding common stock of the Company. New York Life Investment Management LLC and indirect wholly owned subsidiary of New York Life and an affiliate of MacKay Shields LLC, is the manager of the NYLI MacKay High Yield Corporate Bond Fund.
Item 7.	Identification and Classification of the Subsidiary Which Acquired the Security Being Reported on by the Parent Holding Company or Control Person.
	Not Applicable
Item 8.	Identification and Classification of Members of the Group.
	Not Applicable
Item 9.	Notice of Dissolution of Group.
	Not Applicable

Item 10.

Certifications:

By signing below I certify that, to the best of my knowledge and belief, the securities referred to above were acquired and are held in the ordinary course of business and were not acquired and are not held for the purpose of or with the effect of changing or influencing the control of the issuer of the securities and were not acquired and are not held in connection with or as a participant in any transaction having that purpose or effect, other than activities solely in connection with a nomination under ?? 240.14a-11.

SIGNATURE

After reasonable inquiry and to the best of my knowledge and belief, I certify that the information set forth in this statement is true, complete and correct.

MacKay Shields LLC

Signature:	Chris Fitzgerald
Name/Title:	Chief Compliance Officer
Date:	03/31/2026

NYLI MacKay High Yield Corporate Bond Fund

Signature:	Chris Fitzgerald
Name/Title:	Chief Compliance Officer
Date:	03/31/2026

Exhibit Information

Joint Filing Agreement Each of the undersigned hereby agrees that the foregoing statement on Schedule 13G is filed on behalf of each of the undersigned in accordance with the provisions of Rule 13d-1(k) under the Securities Exchange Act of 1934, as amended, and that all subsequent amendments to this statement on Schedule 13G with respect to the common stock of Nine Energy Services, Inc., may be filed on behalf of each of the undersigned without the necessity of filing additional joint filing agreements. The undersigned further agree that each party hereto is responsible for the timely filing of such statement on Schedule13G and any amendments thereto, and for the accuracy and completeness of the information concerning such party contained therein; provided, however, that no party is responsible for the accuracy or completeness of the information concerning any other party, unless such party knows or has reason to believe that such information is inaccurate. This Joint Filing Agreement may be signed in counterparts with the same effect as if the signature on each counterpart were upon the same instrument. IN WITNESS WHEREOF, the undersigned have executed this Agreement as of March 24, 2026. New York Life Investments Funds, on behalf of its series, NYLI MacKay High Yield Corporate Bond Fund By: /s/ Kirk C. Lehneis Name: Kirk C. Lehneis Title: President By: /s/ Rene A. Bustamante Name: Rene A. Bustamante Title: Chief Administrative Officer MacKay Shields LLC