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 113 rows by value; the complete set is available through the API.

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	$9.62M 944,453 shares	0.00%	+29.66K(+3.20%)Added	SEC filing ↗ May 13, 2026	▾
02	RENAISSANCE TECHNOLOGIES LLC CIK 1037389 · View history	$7.88M 773,710 shares	0.01%	-6.90K(-0.90%)Reduced	SEC filing ↗ May 14, 2026	▾
03	Steamboat Capital Partners, LLC CIK 1635663 · View history	$7.21M 707,590 shares	1.79%	+431.18K(+156.00%)Added	SEC filing ↗ May 15, 2026	▾
04	CHARLES SCHWAB INVESTMENT MANAGEMENT INC CIK 884546 · View history	$6.44M 631,539 shares	0.00%	-145.29K(-18.70%)Reduced	SEC filing ↗ May 15, 2026	▾
05	VANGUARD CAPITAL MANAGEMENT LLC CIK 2100119 · Amended · View history	$4.53M 444,467 shares	0.00%	—	SEC filing ↗ May 15, 2026	▾
06	DIMENSIONAL FUND ADVISORS LP CIK 354204 · View history	$3.69M 361,762 shares	0.00%	+35.52K(+10.90%)Added	SEC filing ↗ May 7, 2026	▾
07	TWO SIGMA INVESTMENTS, LP CIK 1179392 · View history	$3.45M 338,158 shares	0.00%	+257.82K(+320.90%)Added	SEC filing ↗ May 15, 2026	▾
08	MORGAN STANLEY CIK 895421 · View history	$3.31M 325,312 shares	0.00%	-9.55K(-2.90%)Reduced	SEC filing ↗ May 15, 2026	▾
09	GEODE CAPITAL MANAGEMENT, LLC CIK 1214717 · View history	$2.58M 253,315 shares	0.00%	+5.87K(+2.40%)Added	SEC filing ↗ May 15, 2026	▾
10	Man Group plc CIK 1637460 · View history	$2.41M 236,212 shares	0.00%	-288(-0.10%)Reduced	SEC filing ↗ May 15, 2026	▾
11	AMERICAN CENTURY COMPANIES INC CIK 748054 · View history	$2.29M 224,280 shares	0.00%	+6.46K(+3.00%)Added	SEC filing ↗ May 15, 2026	▾
12	STATE STREET CORP CIK 93751 · View history	$2.27M 222,638 shares	0.00%	+938(+0.40%)Added	SEC filing ↗ May 15, 2026	▾
13	Peapod Lane Capital LLC CIK 2050979 · View history	$2.21M 219,063 shares	1.82%	+117.50K(+115.70%)Added	SEC filing ↗ May 4, 2026	▾
14	VANGUARD PORTFOLIO MANAGEMENT LLC CIK 2100121 · Amended · View history	$2.07M 202,829 shares	0.00%	—	SEC filing ↗ May 8, 2026	▾
15	Lido Advisors, LLC CIK 1650150 · View history	$1.87M 183,035 shares	0.01%	-147.67K(-44.70%)Reduced	SEC filing ↗ May 13, 2026	▾
16	Trexquant Investment LP CIK 1633445 · View history	$1.84M 180,081 shares	0.01%	+53.12K(+41.80%)Added	SEC filing ↗ May 15, 2026	▾
17	D. E. Shaw & Co., Inc. CIK 1009207 · View history	$1.64M 160,564 shares	0.00%	-58.55K(-26.70%)Reduced	SEC filing ↗ May 15, 2026	▾
18	BRIDGEWAY CAPITAL MANAGEMENT, LLC CIK 1107261 · View history	$1.60M 157,078 shares	0.03%	+39.14K(+33.20%)Added	SEC filing ↗ May 15, 2026	▾
19	GOLDMAN SACHS GROUP INC CIK 886982 · View history	$1.56M 153,171 shares	0.00%	-27.69K(-15.30%)Reduced	SEC filing ↗ May 15, 2026	▾
20	AQR CAPITAL MANAGEMENT LLC CIK 1167557 · View history	$1.48M 145,575 shares	0.00%	+14.07K(+10.70%)Added	SEC filing ↗ May 15, 2026	▾

Showing 20 / 113 institutions. The complete set is available through the API.

Coverage & totals by quarter

Reporting institutions

113

Cancelled or null records excluded

Disclosed shares

8,602,513

Not deduplicated across managers

Disclosed value

$87.64M

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 · Q1 2026

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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.