TRANSMEDICS GROUP INC (TMDX) Top Institutional Shareholders
TRANSMEDICS GROUP INC (TMDX) is currently reported in institutional portfolios tracked by InsiderSet based on the latest available SEC Form 13F filings for the quarter ended March 31, 2026. The institutional investors covered on this page collectively reported approximately $3.47B in TMDX holdings during the latest filing period.
Blackrock, Inc. is currently the largest disclosed institutional shareholder of TMDX tracked by InsiderSet, reporting ownership valued at approximately $526.21M in its March 31, 2026 SEC Form 13F filing. Based on current market prices and the latest disclosed share count, the position is now estimated to be worth approximately $387.58M, representing an estimated loss of -26.35% since the filing period.
The top 10 institutional shareholders tracked on this page collectively account for approximately 56% of the total disclosed TMDX value among the investors covered in this analysis. Major shareholders include Blackrock, Inc., Fmr Llc, Vanguard Portfolio Management Llc, and several other long-term asset managers with concentrated positions in TRANSMEDICS GROUP INC (TMDX).
This page ranks the largest institutional TMDX shareholders using publicly disclosed SEC Form 13F data, including reported values, estimated current holding values, portfolio allocation percentages, ownership concentration metrics, and historical holding changes across major hedge funds and investment firms.
Institutional Holders
410
Total Reported Value
$3.47B
Largest Holder
Blackrock, Inc.
Largest Position
$526.21M
Insider Transactions (90d)
0
Latest Filing Quarter
Q1 2026
New Institutional Positions
60
Funds Exiting Positions
0
| Name | Investor/Manager | Portfolio % | Quantity | Reported Balance | Current Estimated Value | Gain/loss Since Filing | Estimated Portfolio Performance |
|---|---|---|---|---|---|---|---|
| Blackrock, Inc. | 0.01% | 5,293,331 | $526,210,036 | $387,577,696 | -$138,632,340 | -26.35% | |
| Fmr Llc | 0.03% | 5,096,243 | $506,617,469 | $373,146,912 | -$133,470,557 | -26.35% | |
| Vanguard Portfolio Management Llc | 0.01% | 1,919,535 | $190,820,974 | $140,548,353 | -$50,272,621 | -26.35% | |
| Vanguard Capital Management Llc | 0.00% | 1,478,152 | $146,943,090 | $108,230,289 | -$38,712,801 | -26.35% | |
| State Street Corp | 0.00% | 1,319,479 | $131,169,407 | $96,612,252 | -$34,557,155 | -26.35% | |
| Invesco Ltd. | 0.02% | 1,037,974 | $103,184,995 | $76,000,456 | -$27,184,539 | -26.35% | |
| Ubs Am, A Distinct Business Unit Of Ubs Asset Management Americas Llc | 0.02% | 939,523 | $93,397,982 | $68,791,874 | -$24,606,108 | -26.35% | |
| Nomura Asset Management International Inc. | 0.15% | 885,841 | $88,061,000 | $64,861,278 | -$23,199,722 | -26.35% | |
| Goldman Sachs Group Inc | 0.01% | 866,282 | $86,117,068 | $63,429,168 | -$22,687,900 | -26.35% | |
| Geode Capital Management, Llc | 0.01% | 839,155 | $83,435,834 | $61,442,929 | -$21,992,905 | -26.36% | |
| Hood River Capital Management Llc | 0.70% | 699,770 | $69,564,136 | $51,237,159 | -$18,326,977 | -26.35% | |
| Morgan Stanley | 0.00% | 694,150 | $69,005,561 | $50,825,663 | -$18,179,898 | -26.35% | |
| Ubs Group Ag | 0.01% | 580,793 | $57,736,632 | $42,525,663 | -$15,210,969 | -26.35% | |
| Eventide Asset Management, Llc | 0.90% | 548,824 | $54,531,064 | $40,184,893 | -$14,346,171 | -26.31% | |
| Dimensional Fund Advisors Lp | 0.01% | 516,679 | $51,354,981 | $37,831,236 | -$13,523,745 | -26.33% | |
| Wellington Management Group Llp | 0.01% | 486,473 | $48,360,280 | $35,619,553 | -$12,740,727 | -26.35% | |
| Capital World Investors | 0.01% | 374,177 | $37,196,936 | $27,397,240 | -$9,799,696 | -26.35% | |
| Citigroup Inc | 0.02% | 357,381 | $35,527,245 | $26,167,437 | -$9,359,808 | -26.35% | |
| Wasatch Advisors Lp | 0.23% | 346,144 | $34,410,175 | $25,344,664 | -$9,065,511 | -26.35% | |
| Emerald Advisers, Llc | 1.08% | 342,791 | $34,076,853 | $25,099,157 | -$8,977,696 | -26.35% | |
| Northern Trust Corp | 0.00% | 338,159 | $33,616,386 | $24,760,002 | -$8,856,384 | -26.35% | |
| Braidwell Lp | 1.09% | 329,391 | $32,744,759 | $24,118,009 | -$8,626,750 | -26.35% | |
| Two Sigma Investments, Lp | 0.03% | 325,140 | $32,322,167 | $23,806,751 | -$8,515,416 | -26.35% | |
| Frontier Capital Management Co Llc | 0.33% | 320,471 | $31,858,071 | $23,464,887 | -$8,393,184 | -26.35% | |
| Charles Schwab Investment Management Inc | 0.00% | 318,926 | $31,704,434 | $23,351,762 | -$8,352,672 | -26.35% | |
| Millennium Management Llc | 0.02% | 306,080 | $30,427,413 | $22,411,178 | -$8,016,235 | -26.35% | |
| Baillie Gifford & Co | 0.03% | 305,194 | $30,339,335 | $22,346,305 | -$7,993,030 | -26.35% | |
| Bank Of America Corp | 0.00% | 295,176 | $29,343,447 | $21,612,787 | -$7,730,660 | -26.35% | |
| Wells Fargo & Company/Mn | 0.01% | 273,801 | $27,218,597 | $20,047,709 | -$7,170,888 | -26.35% | |
| Royce & Associates Lp | 0.24% | 244,382 | $24,294,015 | $17,893,650 | -$6,400,365 | -26.35% | |
| Vanguard Fiduciary Trust Co | 0.01% | 236,394 | $23,499,928 | $17,308,769 | -$6,191,159 | -26.35% | |
| Principal Financial Group Inc | 0.01% | 231,433 | $23,006,754 | $16,945,524 | -$6,061,230 | -26.35% | |
| Emerald Mutual Fund Advisers Trust | 1.11% | 229,326 | $22,797,298 | $16,791,250 | -$6,006,048 | -26.35% | |
| Bank Of New York Mellon Corp | 0.00% | 211,368 | $21,012,053 | $15,476,365 | -$5,535,688 | -26.35% | |
| Deutsche Bank Ag\ | 0.01% | 195,433 | $19,427,994 | $14,309,604 | -$5,118,390 | -26.35% | |
| Barclays Plc | 0.01% | 190,578 | $18,945,358 | $13,954,121 | -$4,991,237 | -26.35% | |
| Blair William & Co/Il | 0.05% | 174,017 | $17,299,030 | $12,741,525 | -$4,557,505 | -26.35% | |
| Arrowmark Colorado Holdings Llc | 0.45% | 171,068 | $17,005,870 | $12,525,599 | -$4,480,271 | -26.35% | |
| Candriam S.C.A. | 0.08% | 158,766 | $15,782,928 | $11,624,847 | -$4,158,081 | -26.35% | |
| Man Group Plc | 0.03% | 158,409 | $15,747,438 | $11,598,707 | -$4,148,731 | -26.35% | |
| Davidson Kempner Capital Management Lp | 0.31% | 146,400 | $14,553,624 | $10,719,408 | -$3,834,216 | -26.35% | |
| Bnp Paribas Financial Markets | 0.01% | 144,529 | $14,367,628 | $10,582,413 | -$3,785,215 | -26.35% | |
| Susquehanna International Group, Llp | 0.02% | 133,875 | $13,308,514 | $9,802,328 | -$3,506,187 | -26.35% | |
| Firstwave Capital Management Llc | 13.18% | 124,268 | $12,353,482 | $9,098,903 | -$3,254,579 | -26.35% | |
| Public Sector Pension Investment Board | 0.04% | 122,255 | $12,153,370 | $8,951,511 | -$3,201,859 | -26.35% | |
| Envestnet Asset Management Inc | 0.00% | 116,546 | $11,585,788 | $8,533,498 | -$3,052,290 | -26.35% | |
| Exoduspoint Capital Management, Lp | 0.12% | 115,345 | $11,466,446 | $8,445,561 | -$3,020,885 | -26.35% | |
| Oppenheimer & Co Inc | 0.14% | 113,472 | $11,280,252 | $8,308,420 | -$2,971,832 | -26.35% | |
| Trexquant Investment Lp | 0.08% | 106,300 | $10,567,283 | $7,783,286 | -$2,783,997 | -26.35% | |
| Ameriprise Financial Inc | 0.00% | 104,714 | $10,409,818 | $7,667,159 | -$2,742,659 | -26.35% |
Frequently asked questions about TMDX
Who owns the most TMDX stock?
The largest holders of TMDX are typically major institutional investors such as asset managers and hedge funds reporting on Form 13F. The table above ranks tracked superinvestors by reported position size using the latest available filings for TRANSMEDICS GROUP INC (TMDX).
Is TMDX widely held by superinvestors?
Many widely followed stocks like TMDX appear across numerous superinvestor portfolios because of liquidity, index inclusion, and fundamentals. The holder count and table above show how broadly TMDX is represented among the institutional managers we track.
What do “Current Estimated Value”, “Gain/loss Since Filing”, and “Estimated Portfolio Performance” mean?
Current Estimated Value is reported share quantity from the latest 13F times our most recent split-adjusted U.S. session close. Gain/loss Since Filing is that estimate minus the reported 13F dollar value; Estimated Portfolio Performance is that difference as a percent of the reported value. Green means the estimate is above the filing value; red means below (not purchase cost). If many filers share the same implied filing price per share, the performance % may match across rows. These are not official fund marks or live quotes.