Renaissance Holdings amends Schedule 13G: 773,710 shares in MED (MED)

Rhea-AI Filing Summary

MEDIFAST INC Schedule 13G/A amendment reports that Renaissance Technologies LLC and Renaissance Technologies Holdings Corporation beneficially own 773,710 shares of Common Stock, representing 6.96% of the class. The filing states certain funds managed by Renaissance have the right to receive dividends and proceeds; the filing is signed on 05/14/2026.

The report lists sole voting and sole dispositive power over 773,710 shares and provides the issuer CUSIP 58470H101. The filing identifies RTC and RTHC as Delaware entities and gives their New York address.

Insights

Institutional Ownership Analyst

Renaissance reports a passive holding of 773,710 shares (6.96%).

The amendment lists 773,710 shares and 6.96% as the beneficial ownership positions held by Renaissance Technologies LLC and Renaissance Technologies Holdings Corporation, with sole voting and dispositive power over those shares. The filing cites that certain funds managed by RTC have rights to dividends and sale proceeds.

Ownership is reported under Schedule 13G/A; the filing is signed on 05/14/2026. Subsequent filings would show any change in stake or voting/dispositive arrangements.

Key Figures

Beneficial ownership: 773,710 shares Percent of class: 6.96% CUSIP: 58470H101 +1 more

4 metrics

Beneficial ownership 773,710 shares reported on Schedule 13G/A

Percent of class 6.96% percent of common stock beneficially owned

CUSIP 58470H101 MEDIFAST common stock

Filing signature date 05/14/2026 signature date on the amendment

Key Terms

Schedule 13G/A, Sole Dispositive Power, Investment Company Act of 1940

3 terms

Schedule 13G/A regulatory

"This is being filed by Renaissance Technologies LLC ("RTC") and Renaissance Technologies Holdings Corporation ("RTHC")."

A Schedule 13G/A is an amended public filing with the U.S. securities regulator that updates a previous Schedule 13G, disclosing when an individual or group holds a substantial (typically over 5%) stake in a company and is claiming a passive, non‑controlling intent. Investors monitor these updates because rising or falling holdings can signal changing confidence, potential future moves, or shifts in voting power — like watching a public ledger where large shareholders quietly adjust their positions.

Sole Dispositive Power financial

"7 | Sole Dispositive Power 773,710.00 8 | Shared Dispositive Power 0.00"

Sole dispositive power is the exclusive legal authority to decide what happens to a security — for example, whether to sell, transfer, or retain shares — without needing anyone else’s permission. Investors care because it signals who truly controls the economic outcome of an investment: like holding the only key to a safe, the holder can realize gains or losses and may trigger regulatory reporting, insider rules, or influence over corporate ownership.

Investment Company Act of 1940 regulatory

"A listing of the shareholders of an investment company registered under the Investment Company Act of 1940 or the beneficiaries of employee benefit plan"

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.

SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

SCHEDULE 13G

UNDER THE SECURITIES EXCHANGE ACT OF 1934

(Amendment No. 11)

MEDIFAST INC

(Name of Issuer)

Common Stock, $0.001 par value per share

(Title of Class of Securities)

58470H101

(CUSIP Number)

01/02/2026

(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): 58470H101

1

Names of Reporting Persons

Renaissance Technologies 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 773,710.00
6	Shared Voting Power 0.00
7	Sole Dispositive Power 773,710.00
8	Shared Dispositive Power 0.00

9

Aggregate Amount Beneficially Owned by Each Reporting Person

773,710.00

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)

6.96 %

12

Type of Reporting Person (See Instructions)

IA

SCHEDULE 13G

CUSIP Number(s): 58470H101

1

Names of Reporting Persons

Renaissance Technologies Holdings Corporation

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 773,710.00
6	Shared Voting Power 0.00
7	Sole Dispositive Power 773,710.00
8	Shared Dispositive Power 0.00

9

Aggregate Amount Beneficially Owned by Each Reporting Person

773,710.00

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)

6.96 %

12

Type of Reporting Person (See Instructions)

HC

SCHEDULE 13G

Item 1.
(a)	Name of issuer: MEDIFAST INC
(b)	Address of issuer's principal executive offices: 100 International Drive, Baltimore, MD 21202
Item 2.
(a)	Name of person filing: This Schedule 13G is being filed by Renaissance Technologies LLC ("RTC") and Renaissance Technologies Holdings Corporation ("RTHC").
(b)	Address or principal business office or, if none, residence: 800 Third Avenue New York, New York 10022
(c)	Citizenship: RTC is a Delaware limited liability company, and RTHC is a Delaware corporation.
(d)	Title of class of securities: Common Stock, $0.001 par value per share
(e)	CUSIP No.: 58470H101
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: 773710
(b)	Percent of class: 6.96 %
(c)	Number of shares as to which the person has:
	(i) Sole power to vote or to direct the vote: 773710
	(ii) Shared power to vote or to direct the vote: 0
	(iii) Sole power to dispose or to direct the disposition of: 773710
	(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. Certain funds managed by RTC have the right to receive dividends and proceeds from the sale of the securities which are the subject of this report.
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.

Renaissance Technologies LLC

Signature:	Brian Felczak
Name/Title:	Chief Financial Officer
Date:	05/14/2026

Renaissance Technologies Holdings Corporation

Signature:	Brian Felczak
Name/Title:	Vice President
Date:	05/14/2026

Exhibit Information

In accordance with Rule 13d-1(k) under the Securities Exchange Act of 1934, as amended, each of the undersigned agrees to the filing on behalf of each of a Statement on Schedule 13G, and all amendments thereto, with respect to the shares of Common Stock, $0.001 par value per share of MEDIFAST INC.

FAQ

What stake does Renaissance Technologies report in MED (MED)?

Renaissance reports beneficial ownership of 773,710 shares, representing 6.96% of MED's common stock. The filing lists sole voting and dispositive power over those shares and is filed as an amendment to Schedule 13G.

What filing did Renaissance submit for MED and when was it signed?

They filed a Schedule 13G/A (Amendment No. 11) reporting their holdings; the filing is signed by Brian Felczak on 05/14/2026. It amends prior Schedule 13G disclosures.

Does the filing indicate who receives dividends or sale proceeds for MED shares?

The filing states that certain funds managed by RTC have the right to receive dividends and proceeds from sale of the securities covered in this report. No individual beneficiary list is provided.

What voting and dispositive powers does Renaissance report for MED shares?

The report shows sole voting power of 773,710 shares and sole dispositive power of 773,710 shares, with shared voting and dispositive powers reported as 0.