트랜스메딕스 그룹, Inc.
MX ˙ BMV ˙ US89377M1099
SecurityMX:TMDX / TransMedics Group, Inc.
InstitutionMillennium Management Llc
ManagerIsrael Englander
Latest Disclosed Ownership306,080 shares
Latest Disclosed Value $ 30,427,413
Millennium Management Llc ownership in TMDX / TransMedics Group, Inc.

On May 15, 2026 - Millennium Management Llc filed a 13F-HR form disclosing ownership of 306,080 shares of TransMedics Group, Inc. (MX:TMDX) valued at $30,427,413 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 17, 2026 disclosing 149,031 shares of TransMedics Group, Inc.. This represents a change in shares of 105.38% during the quarter.

Millennium Management Llc 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 5,800 of underlying shares valued at $576,578 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.

MX: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 306,080 157,049 105.38 30,427 67.84 0.0127
2026-02-17 2025-12-31 13F TRANSMEDICS GROUP COM 89377M109 149,031 100,217 205.30 18,130 231.06 0.0076
2025-11-14 2025-09-30 13F TRANSMEDICS GROUP COM 89377M109 48,814 -66,100 -57.52 5,477 -64.44 0.0023
2025-08-14 2025-06-30 13F TRANSMEDICS GROUP COM 89377M109 114,914 114,914 15,400 0.0074
2025-05-15 2025-03-31 13F TRANSMEDICS GROUP COM 89377M109 0 -164,925 -100.00 0 -100.00
2025-02-14 2024-12-31 13F TRANSMEDICS GROUP COM 89377M109 164,925 53,088 47.47 10,283 -41.43 0.0050
2024-11-14 2024-09-30 13F TRANSMEDICS GROUP COM 89377M109 111,837 37,223 49.89 17,558 56.24 0.0083
2024-08-14 2024-06-30 13F TRANSMEDICS GROUP COM 89377M109 74,614 22,238 42.46 11,238 190.24 0.0052
2024-05-15 2024-03-31 13F TRANSMEDICS GROUP COM 89377M109 52,376 24,149 85.55 3,873 73.87 0.0017
2024-02-14 2023-12-31 13F TRANSMEDICS GROUP COM 89377M109 28,227 19,122 210.02 2,228 347.19 0.0010
2023-11-14 2023-09-30 13F TRANSMEDICS GROUP COM 89377M109 9,105 -15,936 -63.64 498 -76.31 0.0003
2023-08-14 2023-06-30 13F TRANSMEDICS GROUP COM 89377M109 25,041 15,124 152.51 2,103 179.89 0.0010
2023-05-15 2023-03-31 13F TRANSMEDICS GROUP COM 89377M109 9,917 -133,047 -93.06 751 -91.49 0.0004
2023-02-14 2022-12-31 13F TRANSMEDICS GROUP COM 89377M109 142,964 65,469 84.48 8,824 172.77 0.0049
2022-11-14 2022-09-30 13F TRANSMEDICS GROUP COM 89377M109 77,495 -163,815 -67.89 3,235 -57.37 0.0019
2022-08-15 2022-06-30 13F TRANSMEDICS GROUP COM 89377M109 241,310 241,310 7,589 0.0047
2021-11-15 2021-09-30 13F TRANSMEDICS GROUP COM 89377M109 0 -78,422 -100.00 0 -100.00
2021-08-16 2021-06-30 13F TRANSMEDICS GROUP COM 89377M109 78,422 49,383 170.06 2,602 115.93 0.0016
2021-05-17 2021-03-31 13F TRANSMEDICS GROUP COM 89377M109 29,039 29,039 -62.97 1,205 -53.69 0.0009
2019-11-14 2019-09-30 13F TRANSMEDICS GROUP COM 89377M109 0 -26,262 -100.00 0 -100.00
2019-08-15 2019-06-30 13F/A-1 TRANSMEDICS GROUP COM 89377M109 26,262 26,262 761 0.0011
2019-08-14 2019-06-30 13F SELECT ENERGY SVCS CL A COM 89377M109 11,567 134 0.0002
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 COM Call 5,800 -87.36 577 -89.68 n/a n/a n/a
2026-02-17 2025-12-31 13F TRANSMEDICS GROUP COM Call 45,900 -36.78 5,584 -31.45 n/a n/a n/a
2025-11-14 2025-09-30 13F TRANSMEDICS GROUP COM Call 72,600 118.67 8,146 83.07 n/a n/a n/a
2025-08-14 2025-06-30 13F TRANSMEDICS GROUP COM Call 33,200 -18.02 4,449 63.33 n/a n/a n/a
2025-05-15 2025-03-31 13F TRANSMEDICS GROUP COM Call 40,500 2,725 n/a n/a n/a
2025-02-14 2024-12-31 13F TRANSMEDICS GROUP COM Call 0 -100.00 0 -100.00 n/a n/a n/a
2024-11-14 2024-09-30 13F TRANSMEDICS GROUP COM Call 2,400 0.00 377 4.16 n/a n/a n/a
2024-08-14 2024-06-30 13F TRANSMEDICS GROUP COM Call 2,400 -94.06 361 -87.91 n/a n/a n/a
2024-05-15 2024-03-31 13F TRANSMEDICS GROUP COM Call 40,400 -26.55 2,987 -31.19 n/a n/a n/a
2024-02-14 2023-12-31 13F TRANSMEDICS GROUP COM Call 55,000 83.33 4,341 164.37 n/a n/a n/a
2023-11-14 2023-09-30 13F TRANSMEDICS GROUP COM Call 30,000 200.00 1,642 95.71 n/a n/a n/a
2023-08-14 2023-06-30 13F TRANSMEDICS GROUP COM Call 10,000 840 n/a n/a n/a
2021-11-15 2021-09-30 13F TRANSMEDICS GROUP COM Call 0 -100.00 0 -100.00 n/a n/a n/a
2021-08-16 2021-06-30 13F TRANSMEDICS GROUP COM Call 100,000 3,318 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
(%)
2026-02-17 2025-12-31 13F TRANSMEDICS GROUP COM Put 0 -100.00 0 -100.00 n/a n/a n/a
2025-11-14 2025-09-30 13F TRANSMEDICS GROUP COM Put 14,400 -46.86 1,616 -55.52 n/a n/a n/a
2025-08-14 2025-06-30 13F TRANSMEDICS GROUP COM Put 27,100 -22.13 3,632 55.10 n/a n/a n/a
2025-05-15 2025-03-31 13F TRANSMEDICS GROUP COM Put 34,800 340.51 2,341 375.81 n/a n/a n/a
2025-02-14 2024-12-31 13F TRANSMEDICS GROUP COM Put 7,900 14.49 493 -54.57 n/a n/a n/a
2024-11-14 2024-09-30 13F TRANSMEDICS GROUP COM Put 6,900 0.00 1,083 4.23 n/a n/a n/a
2024-08-14 2024-06-30 13F TRANSMEDICS GROUP COM Put 6,900 -93.75 1,039 -87.27 n/a n/a n/a
2024-05-15 2024-03-31 13F TRANSMEDICS GROUP COM Put 110,400 8,163 n/a n/a n/a
2024-02-14 2023-12-31 13F TRANSMEDICS GROUP COM Put 0 -100.00 0 -100.00 n/a n/a n/a
2023-11-14 2023-09-30 13F TRANSMEDICS GROUP COM Put 61,200 3,351 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.