TransMedics Group, Inc.
US ˙ NasdaqGM ˙ US89377M1099

SecurityTMDX / TransMedics Group, Inc.
InstitutionAdvisor Group Holdings, Inc.
Latest Disclosed Ownership6,988 shares
Latest Disclosed Value $ 694,607
Advisor Group Holdings, Inc. ownership in TMDX / TransMedics Group, Inc.

On May 15, 2026 - Advisor Group Holdings, Inc. filed a 13F-HR form disclosing ownership of 6,988 shares of TransMedics Group, Inc. (US:TMDX) valued at $694,677 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 17, 2026 disclosing 6,873 shares of TransMedics Group, Inc.. This represents a change in shares of 1.67% during the quarter. The current value of the position is $485,177 USD.

Advisor Group Holdings, Inc. has a history of taking positions in derivatives of the underlying security (TMDX) in the form of stock options. The firm currently holds call options representing 1 of underlying shares valued at $2,750 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.

TMDX / TransMedics Group, 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)
2026-05-15 2026-03-31 13F TRANSMEDICS GROUP COM 89377M109 6,988 115 1.67 695 -16.99 0.0006
2026-02-17 2025-12-31 13F TRANSMEDICS GROUP COM 89377M109 6,873 -13,369 -66.05 836 -63.90 0.0012
2025-11-14 2025-09-30 13F TRANSMEDICS GROUP COM 89377M109 20,242 -874 -4.14 2,317 -18.13 0.0032
2025-09-04 2025-06-30 13F/A-1 RANSMEDICS GROUP COM 89377M109 21,116 6,899 48.53 2,830 195.92 0.0050
2025-08-13 2025-06-30 13F RANSMEDICS GROUP COM 89377M109 15,423 1,206 1,009 0.0012
2025-05-12 2025-03-31 13F TRANSMEDICS GROUP COM 89377M109 14,217 -792 -5.28 956 2.25 0.0021
2025-06-06 2024-12-31 13F/A-1 TRANSMEDICS GROUP COM 89377M109 15,009 -47,224 -75.88 936 -90.43 0.0021
2025-02-07 2024-12-31 13F TRANSMEDICS GROUP COM 89377M109 31,007 -31,226 4,845 0.0124
2024-11-13 2024-09-30 13F TRANSMEDICS GROUP COM 89377M109 62,233 -1 -0.00 9,771 4.24 0.0220
2024-08-13 2024-06-30 13F TRANSMEDICS GROUP COM 89377M109 62,234 -22,740 -26.76 9,373 49.20 0.0221
2024-05-10 2024-03-31 13F TRANSMEDICS GROUP COM 89377M109 84,974 -2,246 -2.58 6,283 -8.73 0.0140
2024-02-12 2023-12-31 13F TRANSMEDICS GROUP COM 89377M109 87,220 64,322 280.91 6,884 449.32 0.0120
2023-11-13 2023-09-30 13F TRANSMEDICS GROUP COM 89377M109 22,898 -37,977 -62.39 1,254 -75.48 0.0019
2023-08-21 2023-06-30 13F/A-1 TRANSMEDICS GROUP COM 89377M109 60,875 14,023 29.93 5,112 44.09 0.0092
2023-08-10 2023-06-30 13F TRANSMEDICS GROUP COM 89377M109 60,875 14,023 5,112 0.0014
2023-05-12 2023-03-31 13F TRANSMEDICS GROUP COM 89377M109 46,852 11,668 33.16 3,548 63.38 0.0067
2023-02-10 2022-12-31 13F TRANSMEDICS GROUP COM 89377M109 35,184 18,027 105.07 2,172 202.79 0.0044
2022-11-14 2022-09-30 13F TRANSMEDICS GROUP COM 89377M109 17,157 5,744 50.33 717 99.72 0.0016
2022-08-10 2022-06-30 13F TRANSMEDICS GROUP COM 89377M109 11,413 -1,760 -13.36 359 1.41 0.0008
2022-05-04 2022-03-31 13F TRANSMEDICS GROUP COM 89377M109 13,173 948 7.75 354 51.93 0.0007
2022-02-03 2021-12-31 13F TRANSMEDICS GROUP COM 89377M109 12,225 -2,580 -17.43 233 -52.45 0.0004
2021-11-05 2021-09-30 13F TRANSMEDICS GROUP COM 89377M109 14,805 2,176 17.23 490 16.95 0.0010
2021-08-02 2021-06-30 13F TRANSMEDICS GROUP COM 89377M109 12,629 -2,140 -14.49 419 -31.65 0.0009
2021-05-13 2021-03-31 13F TRANSMEDICS GROUP COM 89377M109 14,769 2,127 16.82 613 144.22 0.0015
2021-02-10 2020-12-31 13F TRANSMEDICS GROUP COM 89377M109 12,642 687 5.75 251 52.12 0.0007
2020-11-12 2020-09-30 13F TRANSMEDICS GROUP COM 89377M109 11,955 5,627 88.92 165 44.74 0.0005
2020-08-14 2020-06-30 13F TRANSMEDICS GROUP COM 89377M109 6,328 -665 -9.51 114 35.71 0.0004
2020-05-18 2020-03-31 13F TRANSMEDICS GROUP COM 89377M109 6,993 6,993 84 0.0003
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
(%)
2026-05-15 2026-03-31 13F TRANSMEDICS GROUP CALL Call 1 0.00 3 -50.00 n/a n/a n/a
2026-02-17 2025-12-31 13F TRANSMEDICS GROUP CALL Call 1 4 n/a n/a n/a
2025-05-12 2025-03-31 13F TRANSMEDICS GROUP CALL Call 0 -100.00 0 -100.00 n/a n/a n/a
2025-02-07 2024-12-31 13F TRANSMEDICS GROUP CALL Call 10 0.00 11 0.00 n/a n/a n/a
2024-11-13 2024-09-30 13F TRANSMEDICS GROUP CALL Call 10 25.00 11 175.00 n/a n/a n/a
2024-08-13 2024-06-30 13F TRANSMEDICS GROUP CALL Call 8 0.00 5 0.00 n/a n/a n/a
2024-05-10 2024-03-31 13F TRANSMEDICS GROUP CALL Call 8 14.29 5 0.00 n/a n/a n/a
2024-02-12 2023-12-31 13F TRANSMEDICS GROUP INC CALL COM Call 7 4 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.