Marten Transport, Ltd.
US ˙ NasdaqGS ˙ US5730751089

SecurityMRTN / Marten Transport, Ltd.
InstitutionJanus Henderson Group Plc
Latest Disclosed Ownership27,758 shares
Latest Disclosed Value $ 364,879
Janus Henderson Group Plc ownership in MRTN / Marten Transport, Ltd.

On May 18, 2026 - Janus Henderson Group Plc filed a 13F-HR/A form disclosing ownership of 27,758 shares of Marten Transport, Ltd. (US:MRTN) valued at $364,463 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 17, 2026 disclosing 27,758 shares of Marten Transport, Ltd.. This represents a change in shares of 0.00% during the quarter. The current value of the position is $492,982 USD.

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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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)
2026-05-18 2026-03-31 13F/A-1 MARTEN TRANS COM 573075108 27,758 0 0.00 365 15.19 0.0001
2026-05-15 2026-03-31 13F MARTEN TRANS COM 573075108 27,758 0 0.00 365 15.19 0.0001
2026-02-17 2025-12-31 13F MARTEN TRANS COM 573075108 27,758 0 0.00 316 6.76 0.0001
2025-11-14 2025-09-30 13F MARTEN TRANS COM 573075108 27,758 0 0.00 296 -17.78 0.0001
2025-08-14 2025-06-30 13F MARTEN TRANS COM 573075108 27,758 0 0.00 361 -5.01 0.0002
2025-05-15 2025-03-31 13F MARTEN TRANS COM 573075108 27,758 0 0.00 380 -12.47 0.0002
2025-02-14 2024-12-31 13F MARTEN TRANS COM 573075108 27,758 0 0.00 433 -11.81 0.0002
2024-11-14 2024-09-30 13F MARTEN TRANS COM 573075108 27,758 0 0.00 492 -3.91 0.0003
2024-08-14 2024-06-30 13F MARTEN TRANS COM 573075108 27,758 -297 -1.06 512 -1.16 0.0003
2024-05-15 2024-03-31 13F MARTEN TRANS COM 573075108 28,055 -26,712 -48.77 518 -55.00 0.0003
2024-02-14 2023-12-31 13F MARTEN TRANS COM 573075108 54,767 26,668 94.91 1,149 107.78 0.0007
2023-11-14 2023-09-30 13F MARTEN TRANS COM 573075108 28,099 2 0.01 554 -8.29 0.0004
2023-08-14 2023-06-30 13F MARTEN TRANS COM 573075108 28,097 -27,508 -49.47 604 -48.20 0.0004
2023-05-15 2023-03-31 13F MARTEN TRANS COM 573075108 55,605 24,028 76.09 1,165 86.54 0.0008
2023-02-14 2022-12-31 13F MARTEN TRANS COM 573075108 31,577 -9,254 -22.66 625 -20.20 0.0004
2023-01-13 2022-09-30 13F/A-1 MARTEN TRANS COM 573075108 40,831 -1,511 -3.57 782 9.83 0.0006
2022-11-14 2022-09-30 13F MARTEN TRANS COM 573075108 40,831 -1,511 782 0.0002
2022-08-15 2022-06-30 13F MARTEN TRANS COM 573075108 42,342 -5,925 -12.28 712 -17.02 0.0005
2022-05-16 2022-03-31 13F MARTEN TRANS COM 573075108 48,267 -6,440 -11.77 858 -8.63 0.0004
2022-02-14 2021-12-31 13F MARTEN TRANS COM 573075108 54,707 5,472 11.11 939 21.47 0.0004
2021-11-16 2021-09-30 13F MARTEN TRANS COM 573075108 49,235 -4,909 -9.07 773 -13.44 0.0003
2021-08-16 2021-06-30 13F MARTEN TRANS COM 573075108 54,144 17,778 48.89 893 44.73 0.0004
2021-05-17 2021-03-31 13F MARTEN TRANS COM 573075108 36,366 8,969 32.74 617 30.72 0.0003
2021-02-16 2020-12-31 13F MARTEN TRANS COM 573075108 27,397 5,221 23.54 472 30.39 0.0002
2020-11-16 2020-09-30 13F MARTEN TRANS COM 573075108 22,176 2,492 12.66 362 -26.87 0.0002
2020-08-14 2020-06-30 13F MARTEN TRANS COM 573075108 19,684 3,044 18.29 495 45.16 0.0003
2020-05-14 2020-03-31 13F MARTEN TRANS COM 573075108 16,640 -1,567,427 -98.95 341 -99.00 0.0002
2020-02-18 2019-12-31 13F MARTEN TRANS COM 573075108 1,584,067 222,078 16.31 34,042 20.28 0.0174
2019-11-14 2019-09-30 13F MARTEN TRANS COM 573075108 1,361,989 2,566 0.19 28,302 14.70 0.0153
2019-07-31 2019-06-30 13F MARTEN TRANS COM 573075108 1,359,423 -19,824 -1.44 24,674 0.33 0.0134
2019-04-30 2019-03-31 13F MARTEN TRANS COM 573075108 1,379,247 4,832 0.35 24,592 10.52 0.0136
2019-02-06 2018-12-31 13F MARTEN TRANS COM 573075108 1,374,415 -36,927 -2.62 22,252 -25.10 0.0142
2018-11-09 2018-09-30 13F MARTEN TRANS COM 573075108 1,411,342 -13,059 -0.92 29,709 -11.06 0.0159
2018-08-10 2018-06-30 13F MARTEN TRANS COM 573075108 1,424,401 67,121 4.95 33,402 7.94 0.0190
2018-05-14 2018-03-31 13F MARTEN TRANS COM 573075108 1,357,280 -21,562 -1.56 30,946 10.56 0.0182
2018-03-12 2017-12-31 13F/A-1 MARTEN TRANS COM 573075108 1,378,842 514,015 59.44 27,990 57.49 0.0172
2018-02-09 2017-12-31 13F MARTEN TRANS COM 573075108 1,378,842 514,015 27,990
2017-11-14 2017-09-30 13F MARTEN TRANS COM 573075108 864,827 186,501 27.49 17,772 -4.38 0.0114
2017-08-17 2017-06-30 13F/A-1 MARTEN TRANS COM 573075108 678,326 -36,068 -5.05 18,586 10.94 0.0127
2017-05-03 2017-03-31 13F MARTEN TRANS COM 573075108 714,394 -33,032 -4.42 16,753 -3.80 0.1176
2017-01-30 2016-12-31 13F MARTEN TRANS COM 573075108 747,426 1,262 0.17 17,415 11.14 0.1284
2016-10-24 2016-09-30 13F MARTEN TRANS COM 573075108 746,164 90,787 13.85 15,669 20.75 0.1155
2016-07-29 2016-06-30 13F MARTEN TRANS COM 573075108 655,377 239,562 57.61 12,976 66.70 0.1079
2016-05-12 2016-03-31 13F MARTEN TRANS COM 573075108 415,815 -12,055 -2.82 7,784 2.79 0.0631
2016-02-03 2015-12-31 13F MARTEN TRANS COM 573075108 427,870 6,817 1.62 7,573 11.24 0.0608
2015-11-16 2015-09-30 13F MARTEN TRANS COM 573075108 421,053 11,280 2.75 6,808 -23.44 0.0600
2015-08-17 2015-06-30 13F MARTEN TRANS COM 573075108 409,773 -5,606 -1.35 8,892 -30.57 0.0699
2015-06-02 2015-03-31 13F/A-1 MARTEN TRANS COM 573075108 415,379 -33,228 -7.41 12,807 30.59 0.0988
2015-05-15 2015-03-31 13F MARTEN TRANS COM 573075108 415,379 12,807
2015-02-12 2014-12-31 13F MARTEN TRANS COM 573075108 448,607 448,607 9,807 0.0707
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.