Pediatrix Medical Group (NYSE: MD) 5.1% stake held via Dimensional funds

Rhea-AI Filing Summary

Pediatrix Medical Group Inc is reported to have a significant institutional holder, as Dimensional Fund Advisors LP may be deemed the beneficial owner of 4,220,311 shares of its common stock, representing 5.1% of the outstanding class.

Dimensional reports sole voting power over 4,117,448 shares and sole dispositive power over 4,220,311 shares, with no shared voting or dispositive power. The shares are owned by investment funds that Dimensional advises, and Dimensional disclaims beneficial ownership of these securities other than for Section 13(d) reporting purposes.

Key Figures

Beneficial ownership: 4,220,311 shares Percent of class: 5.1 % Sole voting power: 4,117,448 shares +3 more

6 metrics

Beneficial ownership 4,220,311 shares Shares of Pediatrix Medical Group common stock Dimensional may be deemed to beneficially own

Percent of class 5.1 % Reported percentage of Pediatrix Medical Group common stock class held

Sole voting power 4,117,448 shares Shares for which Dimensional reports sole power to vote or direct the vote

Shared voting power 0 shares Shares for which Dimensional reports shared power to vote

Sole dispositive power 4,220,311 shares Shares for which Dimensional reports sole power to dispose or direct disposition

Shared dispositive power 0 shares Shares for which Dimensional reports shared power to dispose

Key Terms

beneficial owner, sole voting power, dispositive power, Investment Company Act of 1940, +1 more

5 terms

beneficial owner regulatory

"may possess voting and/or investment power ... and may be deemed to be the beneficial owner"

A beneficial owner is the person who ultimately owns or controls a financial asset or property, even if their name isn't directly on official documents. Think of it like someone who secretly holds the keys to a safe deposit box—others may appear to have access, but the true owner is the one who benefits from what's inside. Identifying beneficial owners helps ensure transparency and prevent illegal activities like money laundering or fraud.

sole voting power regulatory

"Sole power to vote or to direct the vote: 4,117,448"

Sole voting power is the exclusive right to cast votes attached to a shareholder’s stock without needing approval from anyone else. Like holding the only remote control for a TV, it lets that holder decide corporate matters such as board members, mergers, and policy changes, making it important to investors because it concentrates control and can strongly influence a company’s strategy and the value of its shares.

dispositive power regulatory

"Sole power to dispose or to direct the disposition of: 4,220,311"

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.

Investment Company Act of 1940 regulatory

"furnishes investment advice to four investment companies registered under the Investment Company Act of 1940"

A U.S. federal law that sets the rulebook for pooled investment vehicles such as mutual funds, exchange-traded funds and similar money managers, requiring them to register with regulators, disclose holdings and fees, limit conflicts of interest, and follow governance standards. It matters to investors because these protections and transparency rules act like a referee and scoreboard, helping people compare funds, trust that managers follow fair practices, and spot hidden costs or risks.

Section 13(d) of the Securities Exchange Act of 1934 regulatory

"for any other purposes than Section 13(d) of the Securities Exchange Act of 1934"

Section 13(d) of the Securities Exchange Act of 1934 is a U.S. rule that requires anyone who buys more than 5% of a public company’s shares to publicly disclose who they are, how many shares they own, and their intentions toward the company. For investors, this is like a neighborhood alert when someone acquires a large stake in a building: it reveals potential changes in control or strategy that could affect the stock’s price, governance, or future direction.

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

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Available on EDGAR 07/14/2026 - 01:28 PM Accepted by SEC EDGAR 07/14/2026 - 01:27 PM Learn about SEC filing dates

FAQ

What stake in Pediatrix Medical Group (MD) does Dimensional Fund Advisors report?

Dimensional Fund Advisors reports beneficial ownership of 4,220,311 Pediatrix Medical Group common shares, representing 5.1% of the class. The position reflects holdings across multiple investment funds that Dimensional advises, rather than a single pooled account.

How many Pediatrix Medical Group (MD) shares does Dimensional have sole voting power over?

Dimensional reports sole voting power over 4,117,448 Pediatrix Medical Group shares. This means it can vote or direct the vote for those shares held in client funds, while reporting no shared voting authority with other parties.

Does Dimensional share voting or dispositive power over Pediatrix (MD) stock?

Dimensional reports zero shared voting power and zero shared dispositive power over Pediatrix shares. All reported authority is categorized as sole voting and sole dispositive power in connection with securities held in advised funds.

Who actually owns the Pediatrix Medical Group (MD) shares reported by Dimensional?

All reported securities are owned by the Funds advised or managed by Dimensional Fund Advisors and its subsidiaries. Dimensional may be deemed a beneficial owner due to voting and investment authority but states that the Funds themselves own the shares.

Does any single Dimensional-managed fund hold more than 5% of Pediatrix (MD) shares?

According to Dimensional, no single advised fund holds more than 5% of Pediatrix’s common stock. The overall 5.1% stake arises from aggregating positions across multiple Funds, each individually below the 5% threshold.

What does it mean that Dimensional disclaims beneficial ownership of Pediatrix (MD) shares?

Dimensional states it disclaims beneficial ownership of the Pediatrix shares held in client Funds, beyond reporting under Section 13(d). This means it reports the position due to its authority but asserts the economic interests belong to the underlying Funds.

SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

SCHEDULE 13G

UNDER THE SECURITIES EXCHANGE ACT OF 1934

Pediatrix Medical Group Inc

(Name of Issuer)

Common Stock

(Title of Class of Securities)

58502B106

(CUSIP Number)

06/30/2026

(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): 58502B106

1

Names of Reporting Persons

Dimensional Fund Advisors LP

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

UNITED STATES

Number of Shares Beneficially Owned by Each Reporting Person With:

5	Sole Voting Power 4,117,448.00
6	Shared Voting Power 0.00
7	Sole Dispositive Power 4,220,311.00
8	Shared Dispositive Power 0.00

9

Aggregate Amount Beneficially Owned by Each Reporting Person

4,220,311.00

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)

5.1 %

12

Type of Reporting Person (See Instructions)

IA

SCHEDULE 13G

Item 1.
(a)	Name of issuer: Pediatrix Medical Group Inc
(b)	Address of issuer's principal executive offices: 1301 Concord Terrace, Sunrise, FL 33323
Item 2.
(a)	Name of person filing: Dimensional Fund Advisors LP
(b)	Address or principal business office or, if none, residence: 6300 Bee Cave Road, Building One, Austin, TX 78746
(c)	Citizenship: Delaware Limited Partnership
(d)	Title of class of securities: Common Stock
(e)	CUSIP Number(s): 58502B106
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: 4,220,311 ** see Note 1 ** ** Note 1 ** Dimensional Fund Advisors LP, an investment adviser registered under Section 203 of the Investment Advisors Act of 1940, furnishes investment advice to four investment companies registered under the Investment Company Act of 1940, and serves as investment manager or sub-adviser to certain other commingled funds, group trusts and separate accounts (such investment companies, trusts and accounts, collectively referred to as the "Funds"). In certain cases, subsidiaries of Dimensional Fund Advisors LP may act as an adviser or sub-adviser to certain Funds. In its role as investment advisor, sub-adviser and/or manager, Dimensional Fund Advisors LP or its subsidiaries (collectively, "Dimensional") may possess voting and/or investment power over the securities of the Issuer that are owned by the Funds, and may be deemed to be the beneficial owner of the shares of the Issuer held by the Funds. However, all securities reported in this schedule are owned by the Funds. Dimensional disclaims beneficial ownership of such securities. In addition, the filing of this Schedule 13G shall not be construed as an admission that the reporting person or any of its affiliates is the beneficial owner of any securities covered by this Schedule 13G for any other purposes than Section 13(d) of the Securities Exchange Act of 1934.
(b)	Percent of class: 5.1 %
(c)	Number of shares as to which the person has:
	(i) Sole power to vote or to direct the vote: 4,117,448** see Note 1 **
	(ii) Shared power to vote or to direct the vote: 0
	(iii) Sole power to dispose or to direct the disposition of: 4,220,311** see Note 1 **
	(iv) Shared power to dispose or to direct the disposition of: 0
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. The Funds described in Note 1 above have the right to receive or the power to direct the receipt of dividends from, or the proceeds from the sale of the securities held in their respective accounts. To the knowledge of Dimensional, the interest of any one such Fund does not exceed 5% of the class of securities. Dimensional Fund Advisors LP disclaims beneficial ownership of all such securities.
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.

Dimensional Fund Advisors LP

Signature:	Selwyn Notelovitz
Name/Title:	Global Chief Compliance Officer
Date:	07/14/2026