Medifast, Inc.
US ˙ NYSE ˙ US58470H1014

SecurityMED / Medifast, Inc.
InstitutionWalleye Capital LLC
Latest Disclosed Ownership1 shares
Latest Disclosed Value $ 10
Walleye Capital LLC ownership in MED / Medifast, Inc.

On May 13, 2026 - Walleye Capital LLC filed a 13F-HR/A form disclosing ownership of 1 shares of Medifast, Inc. (US:MED) valued at $10 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 13, 2026 disclosing 0 shares of Medifast, Inc.. The current value of the position is $12 USD.

Walleye Capital LLC has a history of taking positions in derivatives of the underlying security (MED) in the form of stock options. The firm currently holds call options representing 55,800 of underlying shares valued at $568,602 USD and put options representing 0 of underlying shares valued at $0 USD .

Note: prior versions of this page mistakenly stated that the share values represented the number of options, not the number of underlying shares. For more information on the data backing these reports, please see the SEC document Frequently Asked Questions About Form 13F.

Institutional Ownership: 13F and NPORT Filings

The Security and Class in the table below are shown exactly as filed by the investor. We do our best to track continuity of investments through acquisitions, and this will be reflected in the table as changes in names. In addition to descriptive data, performance of the investment is shown over time. To calculate quarterly performance, we first calculate cost basis of the shares purchased during the quarter, then use that to calculate gross profit. Quarterly return is Gross Profit / Starting Portfolio value.

Note that cost basis is calculated and stored in thousands, so small quarterly changes in shares frequently result in a cost basis of zero.

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Institutional Put/Call Ratios
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In addition to reporting standard equity and debt issues, institutions with more than 100MM assets under management must also disclose their put and call option holdings. Since put options generally indicate negative sentiment, and call options indicate positive sentiment, we can get a sense of the overall institutional sentiment by plotting the ratio of puts to calls. The chart to the right plots the historical put/call ratio for this instrument.

Using Put/Call Ratio as an indicator of investor sentiment overcomes one of the key deficiencies of using total institutional ownership, which is that a significant amount of assets under management are invested passively to track indices. Passively-managed funds do not typically buy options, so the put/call ratio indicator more closely tracks the sentiment of actively-managed funds.

MED / Medifast, Inc. Historical Put/Call Ratio
Disclosed Equity Positions (from 13F/NPORT Filings)
File
Date
Effective
Date
Form Security Class ID Avg Price
Paid (Est)
Reported
Shares
ΔShares ΔShares
(%)
Reported
Value
(x1000)
ΔValue
(%)
Alloc
(%)
ΔAlloc ΔAlloc (%) Cost Basis
(x1000)
Unrealized
Gain/Loss
(x1000)
2026-05-13 2026-03-31 13F/A-1 MEDIFAST COM 58470H101 1 1 0 0.0000
2026-05-08 2026-03-31 13F MEDIFAST COM 58470H101 1 1 0 0.0000
2026-02-13 2025-12-31 13F MEDIFAST COM 58470H101 0 -29,940 -100.00 0 -100.00
2025-11-14 2025-09-30 13F MEDIFAST COM 58470H101 29,940 -8,154 -21.40 409 -23.55 0.0015
2025-08-13 2025-06-30 13F MEDIFAST COM 58470H101 38,094 25,473 201.83 535 214.71 0.0021
2025-05-14 2025-03-31 13F MEDIFAST COM 58470H101 12,621 12,621 170 0.0008
2025-02-13 2024-12-31 13F MEDIFAST COM 58470H101 0 -6,457 -100.00 0 -100.00
2024-11-14 2024-09-30 13F MEDIFAST COM 58470H101 6,457 -5,017 -43.72 124 -50.80 0.0003
2024-08-14 2024-06-30 13F MEDIFAST COM 58470H101 11,474 -25,176 -68.69 250 -82.19 0.0004
2024-05-15 2024-03-31 13F MEDIFAST COM 58470H101 36,650 36,650 1,404 0.0025
2024-02-14 2023-12-31 13F MEDIFAST COM 58470H101 0 -3,377 -100.00 0 -100.00
2023-11-21 2023-09-30 13F/A-1 MEDIFAST COM 58470H101 3,377 -5,724 -62.89 253 -69.93 0.0006
2023-11-14 2023-09-30 13F MEDIFAST COM 58470H101 3,377 -5,724 253 0.0007
2023-08-14 2023-06-30 13F MEDIFAST COM 58470H101 9,101 9,101 839 0.0030
2023-05-15 2023-03-31 13F MEDIFAST COM 58470H101 0 -1,071 -100.00 0 -100.00
2023-02-14 2022-12-31 13F MEDIFAST COM 58470H101 1,071 -19,234 -94.73 124 -94.41 0.0023
2022-11-14 2022-09-30 13F MEDIFAST COM 58470H101 20,305 20,305 2,200 0.0420
2021-08-16 2021-06-30 13F MEDIFAST COM 58470H101 0 -1,482 -100.00 0 -100.00
2021-05-17 2021-03-31 13F MEDIFAST COM 58470H101 1,482 1,482 314 0.0182
2021-02-16 2020-12-31 13F MEDIFAST COM 58470H101 0 -1,458 -100.00 0 -100.00
2020-11-16 2020-09-30 13F MEDIFAST COM 58470H101 1,458 1,458 240 0.0267
2019-11-14 2019-09-30 13F MEDIFAST COM 58470H101 0 -240 -100.00 0 -100.00
2019-08-14 2019-06-30 13F MEDIFAST COM 58470H101 240 240 31 0.0034
Disclosed Call Options
File
Date
Effective
Date
Form Security Class ID Opt Avg Share
Price
Shares ΔShares
(%)
Value
(x1000)
ΔValue
(%)
Prior Allocation
(%)
Allocation
(%)
ΔAllocation
(%)
Cost Basis
(x1000)
Profit
(x1000)
Return
(%)
2026-05-13 2026-03-31 13F/A MEDIFAST COM Call 55,800 569 n/a n/a n/a
2026-05-08 2026-03-31 13F MEDIFAST COM Call 55,800 569 n/a n/a n/a
2026-02-13 2025-12-31 13F MEDIFAST COM Call 0 -100.00 0 -100.00 n/a n/a n/a
2025-11-14 2025-09-30 13F MEDIFAST COM Call 26,100 26,000.00 357 35,500.00 n/a n/a n/a
2025-08-13 2025-06-30 13F MEDIFAST COM Call 100 -98.00 1 -98.51 n/a n/a n/a
2025-05-14 2025-03-31 13F MEDIFAST COM Call 5,000 67 n/a n/a n/a
2025-02-13 2024-12-31 13F MEDIFAST COM Call 0 -100.00 0 -100.00 n/a n/a n/a
2024-11-14 2024-09-30 13F MEDIFAST COM Call 300 -93.48 6 -95.00 n/a n/a n/a
2024-08-14 2024-06-30 13F MEDIFAST COM Call 4,600 -67.38 100 -81.48 n/a n/a n/a
2024-05-15 2024-03-31 13F MEDIFAST COM Call 14,100 540 n/a n/a n/a
2024-02-14 2023-12-31 13F MEDIFAST COM Call 0 -100.00 0 -100.00 n/a n/a n/a
2023-11-21 2023-09-30 13F/A MEDIFAST COM Call 7,900 229.17 591 167.42 n/a n/a n/a
2023-11-14 2023-09-30 13F MEDIFAST COM Call 7,900 591 n/a n/a n/a
2023-08-14 2023-06-30 13F MEDIFAST COM Call 2,400 700.00 221 612.90 n/a n/a n/a
2023-05-15 2023-03-31 13F MEDIFAST COM Call 300 -66.67 31 -69.90 n/a n/a n/a
2023-02-14 2022-12-31 13F MEDIFAST COM Call 900 104 n/a n/a n/a
2019-11-14 2019-09-30 13F MEDIFAST COM Call 0 -100.00 0 -100.00 n/a n/a n/a
2019-08-14 2019-06-30 13F MEDIFAST COM Call 5,600 -25.33 718 -24.97 n/a n/a n/a
2019-08-14 2019-03-31 13F/A MEDIFAST COM Call 7,500 957 n/a n/a n/a
2019-05-15 2019-03-31 13F MEDIFAST COM Call 7,500 957 n/a n/a n/a
Disclosed Put Options
File
Date
Effective
Date
Form Security Class ID Opt Avg Share Price Shares ΔShares
(%)
Value
(x1000)
ΔValue
(%)
Prior Allocation
(%)
Allocation
(%)
ΔAllocation
(%)
Cost Basis
(x1000)
Profit
(x1000)
Return
(%)
2026-02-13 2025-12-31 13F MEDIFAST COM Put 0 -100.00 0 -100.00 n/a n/a n/a
2025-11-14 2025-09-30 13F MEDIFAST COM Put 10,100 10,000.00 138 13,700.00 n/a n/a n/a
2025-08-13 2025-06-30 13F MEDIFAST COM Put 100 -99.44 1 -99.59 n/a n/a n/a
2025-05-14 2025-03-31 13F MEDIFAST COM Put 17,900 241 n/a n/a n/a
2025-02-13 2024-12-31 13F MEDIFAST COM Put 0 -100.00 0 -100.00 n/a n/a n/a
2024-11-14 2024-09-30 13F MEDIFAST COM Put 6,100 -54.81 117 -60.54 n/a n/a n/a
2024-08-14 2024-06-30 13F MEDIFAST COM Put 13,500 16.38 295 -33.78 n/a n/a n/a
2024-05-15 2024-03-31 13F MEDIFAST COM Put 11,600 445 n/a n/a n/a
2024-02-14 2023-12-31 13F MEDIFAST COM Put 0 -100.00 0 -100.00 n/a n/a n/a
2023-11-21 2023-09-30 13F/A MEDIFAST COM Put 3,400 -61.36 254 -68.68 n/a n/a n/a
2023-11-14 2023-09-30 13F MEDIFAST COM Put 3,400 254 n/a n/a n/a
2023-08-14 2023-06-30 13F MEDIFAST COM Put 8,800 282.61 811 240.76 n/a n/a n/a
2023-05-15 2023-03-31 13F MEDIFAST COM Put 2,300 475.00 238 417.39 n/a n/a n/a
2023-02-14 2022-12-31 13F MEDIFAST COM Put 400 46 n/a n/a n/a
2019-11-14 2019-09-30 13F MEDIFAST COM Put 0 -100.00 0 -100.00 n/a n/a n/a
2019-08-14 2019-06-30 13F MEDIFAST COM Put 1,200 -62.50 154 -62.25 n/a n/a n/a
2019-08-14 2019-03-31 13F/A MEDIFAST COM Put 3,200 408 n/a n/a n/a
2019-05-15 2019-03-31 13F MEDIFAST COM Put 3,200 408 n/a n/a n/a
Legend
Shares
The total number of shares held by the institution at the end of the reporting period (the effective date). This is provided in the filing.
Value
The total value of the shares as of the effective date. This is provided in the filing.
Avg. Share Price
The weighted average share price of the shares held by the institution. We use FIFO accounting to determine this price
Class
This is the security class as indicated by the filer. There are a variety of values for this field. Common values include "EC" = equity common, "EP" - equity preferred
Allocation (%)
The percent of the institution's portfolio that this position represents. This is provided in NPORT filings. For 13F filings, we calculate it.
Change in Allocation
The change in allocation from the prior reporting period. This is calculated as current allocation - prior allocation.
Change in Allocation (%)
The percent change in allocation from the prior reporting period. This is calculated as (current allocation - prior allocation) / prior allocation.
Cost Basis
The total cost of the shares held. This is calculated as reported shares * avg. share price
Unrealized Gain/Loss
This is the market value of the position as of the effective date minus the cost basis.