Company · Ownership research

MEDIFAST INC MED

CIK 0000910329 · CUSIP 58470H101

Insider trading Initial holdings Institutional holders

Quarter-end disclosures, not live holdings.

Several CUSIPs are reported for this company; this page shows CUSIP 58470H101 (MED), not CUSIP 58470H901 (MED), CUSIP 58470H951 (MED), and does not merge CUSIPs.

This page lists the top 20 of 110 rows by value; the complete set is available through the API.

Some filings reported values in thousands; those figures were scaled ×1,000 to dollars.

Top 20 institutions

Weight means this stock's share of the manager's own portfolio.

By reported value

#	Manager	Value	Manager weight	Change vs prior	Source
01	BlackRock, Inc. CIK 2012383 · View history	$9.77M 914,793 shares	0.00%	-3.35K(-0.40%)Reduced	SEC filing ↗ Feb 12, 2026	▾
02	RENAISSANCE TECHNOLOGIES LLC CIK 1037389 · View history	$8.34M 780,610 shares	0.01%	-20.30K(-2.50%)Reduced	SEC filing ↗ Feb 12, 2026	▾
03	CHARLES SCHWAB INVESTMENT MANAGEMENT INC CIK 884546 · View history	$8.30M 776,829 shares	0.00%	+181.62K(+30.50%)Added	SEC filing ↗ Feb 13, 2026	▾
04	VANGUARD GROUP INC CIK 102909 · View history	$7.60M 711,499 shares	0.00%	+190(0.00%)Added	SEC filing ↗ Jan 29, 2026	▾
05	Lido Advisors, LLC CIK 1650150 · View history	$4.03M 330,703 shares	0.02%	0(0.00%)Unchanged	SEC filing ↗ Feb 10, 2026	▾
06	MORGAN STANLEY CIK 895421 · Amended · View history	$3.58M 334,858 shares	0.00%	-253.68K(-43.10%)Reduced	SEC filing ↗ May 27, 2026	▾
07	DIMENSIONAL FUND ADVISORS LP CIK 354204 · View history	$3.48M 326,240 shares	0.00%	+27.87K(+9.30%)Added	SEC filing ↗ Feb 12, 2026	▾
08	Steamboat Capital Partners, LLC CIK 1635663 · View history	$2.95M 276,414 shares	0.81%	+276.41KNew	SEC filing ↗ Feb 17, 2026	▾
09	GEODE CAPITAL MANAGEMENT, LLC CIK 1214717 · View history	$2.64M 247,449 shares	0.00%	-8.60K(-3.40%)Reduced	SEC filing ↗ Feb 9, 2026	▾
10	Man Group plc CIK 1637460 · View history	$2.53M 236,500 shares	0.00%	+23.07K(+10.80%)Added	SEC filing ↗ Feb 17, 2026	▾
11	STATE STREET CORP CIK 93751 · View history	$2.37M 221,700 shares	0.00%	-4.33K(-1.90%)Reduced	SEC filing ↗ Feb 13, 2026	▾
12	D. E. Shaw & Co., Inc. CIK 1009207 · View history	$2.34M 219,118 shares	0.00%	-44.53K(-16.90%)Reduced	SEC filing ↗ Feb 17, 2026	▾
13	AMERICAN CENTURY COMPANIES INC CIK 748054 · View history	$2.33M 217,822 shares	0.00%	-3.42K(-1.50%)Reduced	SEC filing ↗ Feb 13, 2026	▾
14	GOLDMAN SACHS GROUP INC CIK 886982 · Amended · View history	$1.93M 180,863 shares	0.00%	-30.55K(-14.50%)Reduced	SEC filing ↗ Mar 25, 2026	▾
15	ACADIAN ASSET MANAGEMENT LLC CIK 916542 · View history	$1.68M 157,778 shares	0.00%	-239.66K(-60.30%)Reduced	SEC filing ↗ Feb 10, 2026	▾
16	AQR CAPITAL MANAGEMENT LLC CIK 1167557 · View history	$1.40M 131,509 shares	0.00%	-179.31K(-57.70%)Reduced	SEC filing ↗ Feb 17, 2026	▾
17	Quinn Opportunity Partners LLC CIK 1633275 · View history	$1.36M 127,112 shares	0.06%	0(0.00%)Unchanged	SEC filing ↗ Feb 13, 2026	▾
18	Trexquant Investment LP CIK 1633445 · View history	$1.36M 126,959 shares	0.01%	+59.44K(+88.00%)Added	SEC filing ↗ Feb 17, 2026	▾
19	BRIDGEWAY CAPITAL MANAGEMENT, LLC CIK 1107261 · View history	$1.26M 117,939 shares	0.03%	-538(-0.50%)Reduced	SEC filing ↗ Feb 17, 2026	▾
20	Prescott Group Capital Management, L.L.C. CIK 1166152 · View history	$1.19M 111,244 shares	0.11%	+31.27K(+39.10%)Added	SEC filing ↗ Feb 6, 2026	▾

Showing 20 / 110 institutions. The complete set is available through the API.

Coverage & totals by quarter

Reporting institutions

110

Cancelled or null records excluded

Disclosed shares

8,065,658

Not deduplicated across managers

Disclosed value

$86.51M

Not market cap or free float

Reporting institutions by quarter

Counts also change with data coverage and reporting entities; they do not measure net buying. Distinct managers with a live stock row in this CUSIP; totals may include overlapping filings and are not a share of the company.

MEDIFAST INC · Q4 2025

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Sources, coverage & how to read this data

Figures are as reported to the SEC and merged with later amendments where Akkru could match them. Preview limits apply to what is listed, not to the totals, which come from the complete reported data. Nothing is zero-filled: a missing quarter or month is shown as missing.