Comparable stake leader
Steamboat Capital Partners, LLC
SEC ownership of MEDIFAST INC
Top holders, 13D/G large-stake signals, insider positions, and transaction flow tied to CIK 0000910329.
Disclosed value leader
RENAISSANCE TECHNOLOGIES LLC
Comparable rows
50/50
Latest evidence
26 Aug 2026
- Public ticker
- MED on NYSE
- Parsed ownership sources
-
13D/G, 13F, and 3/4/5
Source: Parsed SEC ownership filingsUse: Compare filing families carefully
- Largest SEC-reported holder
-
Steamboat Capital Partners, LLC
Ranking: Comparable ownership first, then disclosed value
- Comparable ownership rows
-
50 of 50
Meaning: Rows with safely comparable ownership %
- Latest 13D/G holder
-
Steamboat Capital Partners, LLC
Source: Latest parsed Schedule 13D/G stake
- Latest parsed ownership date
-
26 Aug 2026
Freshness: Most recent filing date in this holder set
- Issuer CIK
- 0000910329
- Issuer location
- Baltimore, MD
Ownership snapshot
CIK-linked ownership evidence from parsed SEC filings.
3 signals
Issuer
Names, identifiers, and filing context for this profile.
2 identity fields
Ownership snapshot
Top shareholders of MEDIFAST INC (13F + 13D/G + 3/4/5)
Grouped by holder across the latest SEC ownership disclosures. Start with comparable ownership when available, then verify the linked 13F, 13D/G, or 3/4/5 evidence.
Comparable stake leader
Steamboat Capital Partner...
Disclosed value leader
RENAISSANCE TECHNOLOGIES LLC
Comparable rows
50/50
Latest evidence
26 Aug 2026
13D/G
13F
3/4/5
Lead comparable stake: 7.1%
13D/G row: Steamboat Capital Partners, LLC
Showing 1-8 of 50 holder rows.
Quick read
Steamboat Capital Partners, LLC leads the comparable SEC ownership view at 7.1%.
50 of 50 rows have a safely comparable ownership percentage. Use this as a filing-backed starting point, then open the detailed table for source links, reporting role, position value, share count, and filing date.
Open SEC evidence
Opens Steamboat Capital Partners, LLC's linked filing trail.
Comparable ownership
Top 5
Steamboat Capital Partners, LLC
7.1%
RENAISSANCE TECHNOLOGIES LLC
7%
SUSQUEHANNA SECURITIES, LLC
5.3%
CHARLES SCHWAB INVESTMENT MANAGEM...
3.6%
BlackRock, Inc.
2.9%
Ownership % is shown only when SEC disclosures are safely comparable across share classes.
Detailed SEC evidence table Showing 1-8 of 50 holder rows
| Holder | Evidence | Ownership % | Position | 12M Net Δ | As of |
|---|---|---|---|---|---|
| Steamboat Capital Partners, LLC |
13D/G
13F
Company
|
7.1%
|
$7,622,281
790,693 shares
|
+$1,283,113 | 20 Aug 2026 |
| RENAISSANCE TECHNOLOGIES LLC |
13F
13D/G
Company
|
7%
from 13D/G
|
$8,261,052
778,610 shares
|
— | 30 Jun 2026 |
| SUSQUEHANNA SECURITIES, LLC |
13D/G
Susquehanna Portfolio Strategies, LLC
|
5.3%
|
$6,271,446
587,214 shares
|
+$4,680,724 | 30 Jun 2026 |
| CHARLES SCHWAB INVESTMENT MANAGEMENT INC |
13D/G
13F
Company
|
3.6%
|
$4,239,917
396,996 shares
|
+$4,239,917 | 30 Jun 2026 |
| BlackRock, Inc. |
13F
13D/G
Company
|
2.9%
from 13D/G
|
$3,920,427
369,503 shares
|
— | 30 Jun 2026 |
| Citadel Securities GP LLC |
13D/G
Kenneth Griffin
|
2.6%
|
$3,094,541
289,751 shares
|
-$4,551,378 | 30 Jun 2026 |
| Parsa Kiai |
3/4/5
Director
|
6.3%
|
$7,146,257
697,177 shares
|
+$1,423,802 | 26 Aug 2026 |
| Daniel R. Chard |
3/4/5
Chairman & CEO, Director
|
3.2%
|
$3,787,830
355,609 shares
|
+$178,725 | 13 Mar 2026 |
How to read this table
Rows are grouped by holder and ranked first by SEC-reported ownership % when it is safely comparable, then by disclosed holdings value. — indicates unavailable or non-comparable values; "mixed-class rows" means the latest filing spans non-comparable classes.
Forms 3/4/5 flow
Insider trading overview
Net insider flow leans to buying over the last 12 months. Net value: +$1,665,477.
Buys
$1,665,477
Insiders: 3
Sells
$0
Insiders: 0
Net
+$1,665,477
Shares: +142,644
Window
Last 12 months
4 rolling buckets
Buy value
Sell value
Shares: 142,644
Shares: 0
| Window (months) | Buy shares | Sell shares | Buy value | Sell value | Net value |
|---|---|---|---|---|---|
| 0-3 | 119,966 | 0 | $1,423,802 | $0 | +$1,423,802 |
| 3-6 | 22,678 | 0 | $241,675 | $0 | +$241,675 |
| 6-9 | 0 | 0 | $0 | $0 | $0 |
| 9-12 | 0 | 0 | $0 | $0 | $0 |
Reporting owners
Insider holders from Forms 3/4/5
Showing 1-14 of 14 reporting-owner rows connected to MEDIFAST INC. Open a relationship link for the CIK-to-CIK filing trail.
Rows
14
Largest Forms 3/4/5 holder
Parsa Kiai
Net 12M change
+$1,665,477
Latest report
26 Aug 2026
| Name | Relationship | Holdings Value | Past Year Net Change | Change % | Valuation | Report Date |
|---|---|---|---|---|---|---|
| Parsa Kiai | Director | $7,146,257 | +$1,423,802 | +25% | Mixed | 26 Aug 2026 |
| Daniel R. Chard | Chairman & CEO, Director | $3,787,830 | +$178,725 | +5% | Mixed | 13 Mar 2026 |
| Kevin G. Byrnes | Director | $1,027,977 | Mixed | 11 Nov 2021 | ||
| James P. Maloney | Chief Financial Officer | $779,992 | Mixed | 13 Mar 2026 | ||
| Jeffrey J. Brown | Director | $573,487 | Mixed | 25 Jun 2025 | ||
| Ming Xian | Director | $430,393 | Mixed | 26 May 2026 | ||
| Scott Schlackman | Director | $430,310 | +$62,950 | +17% | Mixed | 26 May 2026 |
| Andrea B. Thomas | Director | $363,753 | Mixed | 26 May 2026 | ||
| Michael A. Hoer | Director | $351,575 | Mixed | 25 Jun 2025 | ||
| Elizabeth A. Geary | Director | $318,182 | Mixed | 26 May 2026 | ||
| Jonathan Barrett MacKenzie | VP, Finance & CAO | $222,549 | Mixed | 13 Mar 2026 | ||
| Nicholas Mark Johnson | President | $195,833 | Mixed | 05 Jan 2026 | ||
| Jeffrey Matthew Rose | Director | $187,689 | Mixed | 26 May 2026 | ||
| Constance J. Hallquist | Former Director | $148,251 | Mixed | 06 Oct 2023 |
Recent insider transactions for MEDIFAST INC
Showing up to 300 recent insider transactions from the last 12 months.
| Insider | Symbol | Class | Transaction | % | SEC-reported value | SEC-reported price | Shares | Shares owned | Date | Ownership |
|---|---|---|---|---|---|---|---|---|---|---|
| Parsa Kiai | MED | Common Stock | Purchase | 6.5% | $529,157 | $12.26 | 43,150 | 707,492 | 26 Aug 2026 | Notes |
| Parsa Kiai | MED | Common Stock | Purchase | 0.65% | $51,946 | $12.00 | 4,329 | 665,517 | 24 Aug 2026 | Notes |
| Parsa Kiai | MED | Common Stock | Purchase | 6.98% | $500,700 | $11.60 | 43,150 | 661,306 | 20 Aug 2026 | Notes |
| Parsa Kiai | MED | Common Stock | Purchase | 4.97% | $341,999 | $11.66 | 29,337 | 619,331 | 19 Aug 2026 | Notes |
| Jeffrey Matthew Rose | MED | Common Stock | Award | 18,419 | 18,419 | 26 May 2026 | Direct | |||
| Parsa Kiai | MED | Common Stock | Award | 19,317 | 19,317 | 26 May 2026 | Direct | |||
| Andrea B. Thomas | MED | Common Stock | Award | 48.6% | 11,680 | 35,697 | 26 May 2026 | Direct | ||
| Scott Schlackman | MED | Common Stock | Award | 38.2% | 11,680 | 42,229 | 26 May 2026 | Direct | ||
| Elizabeth A. Geary | MED | Common Stock | Award | 59.8% | 11,680 | 31,225 | 26 May 2026 | Direct | ||
| Ming Xian | MED | Restricted Stock Units (cash settled) | Award | 36.3% | 11,680 | 43,823 | 26 May 2026 | Direct | ||
| Scott Schlackman | MED | Common Stock | Purchase | 8.91% | $31,325 | $12.53 | 2,500 | 30,549 | 11 May 2026 | Direct |
| Scott Schlackman | MED | Common Stock | Purchase | 9.79% | $31,625 | $12.65 | 2,500 | 28,049 | 08 May 2026 | Direct |
| Jonathan Barrett MacKenzie | MED | Common Stock | Award | 108.2% | 10,830 | 20,838 | 25 Mar 2026 | Direct | ||
| Jonathan Barrett MacKenzie | MED | Common Stock | Tax liability | -7.93% | -862 | 10,008 | 25 Mar 2026 | Direct | ||
| James P. Maloney | MED | Common Stock | Award | 93.8% | 35,358 | 73,033 | 25 Mar 2026 | Direct | ||
| James P. Maloney | MED | Common Stock | Tax liability | -7.88% | -3,224 | 37,675 | 25 Mar 2026 | Direct | ||
| Daniel R. Chard | MED | Common Stock | Award | 28.5% | 41,795 | 188,233 | 25 Mar 2026 | Direct | ||
| Daniel R. Chard | MED | Common Stock | Tax liability | -12.1% | -20,095 | 146,438 | 25 Mar 2026 | Direct | ||
| Daniel R. Chard | MED | Common Stock | Purchase | $178,725 | $10.11 | 17,678 | 17,678 | 20 Mar 2026 | Dan and Allyson as Joint Tenants | |
| Jonathan Barrett MacKenzie | MED | Common Stock | Tax liability | -0.64% | -70 | 10,870 | 17 Mar 2026 | Direct | ||
| James P. Maloney | MED | Common Stock | Tax liability | -1.16% | -482 | 40,899 | 17 Mar 2026 | Direct | ||
| Daniel R. Chard | MED | Common Stock | Tax liability | -1.56% | -2,638 | 166,533 | 17 Mar 2026 | Direct | ||
| Jonathan Barrett MacKenzie | MED | Common Stock | Tax liability | -1.78% | -198 | 10,940 | 13 Mar 2026 | Direct | ||
| James P. Maloney | MED | Common Stock | Tax liability | -2.17% | -918 | 41,381 | 13 Mar 2026 | Direct | ||
| Daniel R. Chard | MED | Common Stock | Tax liability | -4.01% | -7,075 | 169,171 | 13 Mar 2026 | Direct |
* marks a reported price that did not pass the local price check.