MARTEN TRANSPORT LTD (MRTN) Institutional Shareholders
MARTEN TRANSPORT LTD (MRTN) is currently reported in institutional portfolios tracked by InsiderSet based on the latest available SEC Form 13F filings for the quarter ended June 30, 2026. The institutional investors covered on this page collectively reported approximately $1.05B in MRTN holdings during the latest filing period.
Blackrock, Inc. is currently the largest disclosed institutional shareholder of MRTN tracked by InsiderSet, reporting ownership valued at approximately $174.52M in its June 30, 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 $153.00M, representing an estimated loss of -12.33% since the filing period.
The top 10 institutional shareholders tracked on this page collectively account for approximately 55% of the total disclosed MRTN value among the investors covered in this analysis. Major shareholders include Blackrock, Inc., Dimensional Fund Advisors Lp, American Century Companies Inc, and several other long-term asset managers with concentrated positions in MARTEN TRANSPORT LTD (MRTN).
This page ranks the largest institutional MRTN 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
228
Total Reported Value
$1.05B
Largest Holder
Blackrock, Inc.
Largest Position
$174.52M
Insider Transactions (90d)
1
Latest Filing Quarter
Q2 2026
New Institutional Positions
71
Funds Exiting Positions
0
| Name | Investor/Manager | Portfolio % | Quantity | Reported Balance | Current Estimated Value | Gain/loss Since Filing | Estimated Portfolio Performance |
|---|---|---|---|---|---|---|---|
| Blackrock, Inc. | 0.00% | 10,058,930 | $174,522,436 | $152,996,325 | -$21,526,111 | -12.33% | |
| Dimensional Fund Advisors Lp | 0.02% | 4,999,156 | $86,737,142 | $76,037,163 | -$10,699,979 | -12.34% | |
| American Century Companies Inc | 0.02% | 2,800,863 | $48,594,973 | $42,601,126 | -$5,993,847 | -12.33% | |
| State Street Corp | 0.00% | 2,723,602 | $47,254,495 | $41,425,986 | -$5,828,509 | -12.33% | |
| Fmr Llc | 0.00% | 2,702,378 | $46,886,258 | $41,103,169 | -$5,783,089 | -12.33% | |
| Vanguard Capital Management Llc | 0.00% | 2,524,859 | $43,806,304 | $38,403,105 | -$5,403,199 | -12.33% | |
| Goldman Sachs Group Inc | 0.00% | 2,101,794 | $36,466,135 | $31,968,287 | -$4,497,848 | -12.33% | |
| Nuveen, Llc | 0.01% | 1,945,243 | $33,749,951 | $29,587,146 | -$4,162,805 | -12.33% | |
| Two Sigma Investments, Lp | 0.02% | 1,830,565 | $31,760,303 | $27,842,894 | -$3,917,409 | -12.33% | |
| Geode Capital Management, Llc | 0.00% | 1,554,058 | $26,968,001 | $23,637,222 | -$3,330,779 | -12.35% | |
| Cramer Rosenthal Mcglynn Llc | 1.34% | 1,523,757 | $26,437,184 | $23,176,344 | -$3,260,840 | -12.33% | |
| Royce & Associates Lp | 0.19% | 1,394,890 | $24,201,342 | $21,216,277 | -$2,985,065 | -12.33% | |
| Morgan Stanley | 0.00% | 1,353,069 | $23,475,803 | $20,580,179 | -$2,895,624 | -12.33% | |
| Vanguard Portfolio Management Llc | 0.00% | 1,218,980 | $21,149,303 | $18,540,686 | -$2,608,617 | -12.33% | |
| Charles Schwab Investment Management Inc | 0.00% | 1,198,050 | $20,786,168 | $18,222,341 | -$2,563,828 | -12.33% | |
| Sixth Street Partners Management Company, L.P. | 0.00% | 1,198,050 | $20,786,168 | $18,222,341 | -$2,563,828 | -12.33% | |
| Ameriprise Financial Inc | 0.00% | 1,081,606 | $18,765,866 | $16,451,227 | -$2,314,639 | -12.33% | |
| Boston Partners | 0.02% | 1,049,147 | $18,203,041 | $15,957,526 | -$2,245,515 | -12.34% | |
| Russell Investments Group, Ltd. | 0.01% | 922,443 | $16,004,399 | $14,030,358 | -$1,974,041 | -12.33% | |
| Arrowstreet Capital, Limited Partnership | 0.01% | 919,740 | $15,957,489 | $13,989,245 | -$1,968,244 | -12.33% | |
| London Co Of Virginia | 0.08% | 853,969 | $14,816,386 | $12,988,868 | -$1,827,518 | -12.33% | |
| 12Th Street Asset Management Company, Llc | 1.88% | 758,634 | $13,162,300 | $11,538,823 | -$1,623,477 | -12.33% | |
| Citadel Advisors Llc | 0.01% | 722,251 | $12,531,055 | $10,985,438 | -$1,545,617 | -12.33% | |
| Next Century Growth Investors Llc | 0.64% | 699,305 | $12,132,941 | $10,636,429 | -$1,496,512 | -12.33% | |
| Northern Trust Corp | 0.00% | 667,681 | $11,584,266 | $10,155,428 | -$1,428,838 | -12.33% | |
| Jpmorgan Chase & Co | 0.00% | 604,366 | $10,606,623 | $9,192,407 | -$1,414,216 | -13.33% | |
| Deprince Race & Zollo Inc | 0.19% | 767,686 | $10,079,717 | $11,676,504 | +$1,596,787 | +15.84% | |
| Nuance Investments, Llc | 1.61% | 546,871 | $9,488,211 | $8,317,908 | -$1,170,303 | -12.33% | |
| Bank Of America Corp | 0.00% | 486,041 | $8,432,812 | $7,392,684 | -$1,040,128 | -12.33% | |
| Aqr Capital Management Llc | 0.00% | 395,125 | $6,855,412 | $6,009,851 | -$845,561 | -12.33% | |
| Vanguard Fiduciary Trust Co | 0.00% | 384,638 | $6,673,469 | $5,850,344 | -$823,125 | -12.33% | |
| Norges Bank | 0.00% | 379,000 | $6,575,650 | $5,764,590 | -$811,060 | -12.33% | |
| Teacher Retirement System Of Texas | 0.02% | 363,027 | $6,298,519 | $5,521,641 | -$776,878 | -12.33% | |
| Heartland Advisors Inc | 0.27% | 350,000 | $6,072,500 | $5,323,500 | -$749,000 | -12.33% | |
| Bank Of New York Mellon Corp | 0.00% | 329,668 | $5,719,745 | $5,014,250 | -$705,495 | -12.33% | |
| Invesco Ltd. | 0.00% | 323,199 | $5,607,503 | $4,915,857 | -$691,646 | -12.33% | |
| Nicholas Company, Inc. | 0.10% | 315,135 | $5,467,592 | $4,793,203 | -$674,389 | -12.33% | |
| Mackenzie Financial Corp | 0.01% | 313,098 | $5,432,250 | $4,762,221 | -$670,029 | -12.33% | |
| Principal Financial Group Inc | 0.00% | 279,992 | $4,857,862 | $4,258,678 | -$599,184 | -12.33% | |
| Stanley-Laman Group, Ltd. | 0.48% | 270,445 | $4,692,225 | $4,113,468 | -$578,757 | -12.33% | |
| Buckland Partners Management Co Llc | 2.27% | 267,594 | $4,642,756 | $4,070,105 | -$572,651 | -12.33% | |
| Polar Asset Management Partners Inc. | 0.08% | 255,800 | $4,438,130 | $3,890,718 | -$547,412 | -12.33% | |
| Ubs Group Ag | 0.00% | 250,880 | $4,352,768 | $3,815,885 | -$536,883 | -12.33% | |
| Allianz Asset Management Gmbh | 0.00% | 241,291 | $4,186,399 | $3,670,036 | -$516,363 | -12.33% | |
| Aptus Capital Advisors, Llc | 0.03% | 204,337 | $3,545,247 | $3,107,966 | -$437,281 | -12.33% | |
| Us Bancorp \De\ | 0.00% | 200,518 | $3,478,988 | $3,049,879 | -$429,109 | -12.33% | |
| Public Sector Pension Investment Board | 0.01% | 198,609 | $3,445,866 | $3,020,843 | -$425,023 | -12.33% | |
| Rhumbline Advisers | 0.00% | 146,904 | $2,548,802 | $2,234,410 | -$314,392 | -12.33% | |
| Legal & General Group Plc | 0.00% | 132,866 | $2,305,224 | $2,020,892 | -$284,332 | -12.33% | |
| Connor, Clark & Lunn Investment Management Ltd. | 0.00% | 125,451 | $2,176,575 | $1,908,110 | -$268,465 | -12.33% |
Frequently asked questions about MRTN
Who owns the most MRTN stock?
The largest holders of MRTN 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 MARTEN TRANSPORT LTD (MRTN).
Is MRTN widely held by superinvestors?
Many widely followed stocks like MRTN appear across numerous superinvestor portfolios because of liquidity, index inclusion, and fundamentals. The holder count and table above show how broadly MRTN 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.