트랜스메딕스 그룹, Inc.
US ˙ NasdaqGM ˙ US89377M1099

SecurityTMDX / TransMedics Group, Inc.
InstitutionUBS Group AG
Latest Disclosed Ownership580,793 shares
Latest Disclosed Value $ 57,736,632
UBS Group AG ownership in TMDX / TransMedics Group, Inc.

On May 5, 2026 - UBS Group AG filed a 13F-HR form disclosing ownership of 580,793 shares of TransMedics Group, Inc. (US:TMDX) valued at $57,736,632 USD as of March 31, 2026. The entity filed a previous 13F-HR on January 29, 2026 disclosing 659,296 shares of TransMedics Group, Inc.. This represents a change in shares of -11.91% during the quarter. The current value of the position is $41,451,196 USD.

UBS Group AG 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 1,000 of underlying shares valued at $99,410 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)
2026-05-05 2026-03-31 13F TRANSMEDICS GROUP COM 89377M109 580,793 -78,503 -11.91 57,737 -28.01 0.0016
2026-01-29 2025-12-31 13F TRANSMEDICS GROUP COM 89377M109 659,296 -196,767 -22.99 80,203 -16.50 0.0130
2025-11-13 2025-09-30 13F TRANSMEDICS GROUP COM 89377M109 856,063 379,925 79.79 96,050 50.53 0.0150
2025-08-14 2025-06-30 13F TRANSMEDICS GROUP COM 89377M109 476,138 -265,197 -35.77 63,807 27.93 0.0110
2025-05-13 2025-03-31 13F TRANSMEDICS GROUP COM 89377M109 741,335 151,093 25.60 49,877 35.53 0.0092
2025-02-14 2024-12-31 13F TRANSMEDICS GROUP COM 89377M109 590,242 530,990 896.16 36,802 295.62 0.0068
2024-11-14 2024-09-30 13F TRANSMEDICS GROUP COM 89377M109 59,252 26,841 82.81 9,303 90.58 0.0020
2024-08-14 2024-06-30 13F TRANSMEDICS GROUP COM 89377M109 32,411 -12,788 -28.29 4,882 46.05 0.0012
2024-05-13 2024-03-31 13F TRANSMEDICS GROUP COM 89377M109 45,199 4,936 12.26 3,342 5.19 0.0008
2024-02-09 2023-12-31 13F TRANSMEDICS GROUP COM 89377M109 40,263 16,309 68.08 3,178 142.33 0.0010
2023-11-09 2023-09-30 13F TRANSMEDICS GROUP COM 89377M109 23,954 20,904 685.38 1,311 412.11 0.0005
2023-08-11 2023-06-30 13F TRANSMEDICS GROUP COM 89377M109 3,050 -11,286 -78.72 256 -76.41 0.0001
2023-05-12 2023-03-31 13F TRANSMEDICS GROUP COM 89377M109 14,336 4,472 45.34 1,086 78.45 0.0004
2023-02-08 2022-12-31 13F TRANSMEDICS GROUP COM 89377M109 9,864 6,786 220.47 609 375.00 0.0002
2022-11-10 2022-09-30 13F TRANSMEDICS GROUP COM 89377M109 3,078 -576 -15.76 128 11.30 0.0001
2022-08-10 2022-06-30 13F TRANSMEDICS GROUP COM 89377M109 3,654 -9,989 -73.22 115 -68.66 0.0000
2022-05-16 2022-03-31 13F TRANSMEDICS GROUP COM 89377M109 13,643 -11,692 -46.15 367 -24.49 0.0001
2022-02-14 2021-12-31 13F TRANSMEDICS GROUP COM 89377M109 25,335 22,310 737.52 486 386.00 0.0001
2021-11-15 2021-09-30 13F TRANSMEDICS GROUP COM 89377M109 3,025 675 28.72 100 28.21 0.0000
2021-08-13 2021-06-30 13F TRANSMEDICS GROUP COM 89377M109 2,350 -1,199 -33.78 78 -47.30 0.0000
2021-05-12 2021-03-31 13F TRANSMEDICS GROUP COM 89377M109 3,549 -5,729 -61.75 148 -19.57 0.0000
2021-02-11 2020-12-31 13F TRANSMEDICS GROUP COM 89377M109 9,278 1,548 20.03 184 73.58 0.0001
2020-11-12 2020-09-30 13F TRANSMEDICS GROUP COM 89377M109 7,730 -5,888 -43.24 106 -56.56 0.0000
2020-07-31 2020-06-30 13F TRANSMEDICS GROUP COM 89377M109 13,618 -896 -6.17 244 39.43 0.0001
2020-05-01 2020-03-31 13F TRANSMEDICS GROUP COM 89377M109 14,514 -8,330 -36.46 175 -59.68 0.0001
2020-02-14 2019-12-31 13F TRANSMEDICS GROUP COM 89377M109 22,844 11,348 98.71 434 58.97 0.0002
2019-11-14 2019-09-30 13F TRANSMEDICS GROUP COM 89377M109 11,496 4,700 69.16 273 38.58 0.0001
2019-08-14 2019-06-30 13F TRANSMEDICS GROUP COM 89377M109 6,796 6,796 197 0.0001
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
(%)
2026-05-05 2026-03-31 13F TRANSMEDICS GROUP COM Call 1,000 99 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.