Marten Transport, Ltd.
US ˙ NasdaqGS ˙ US5730751089

SecurityMRTN / Marten Transport, Ltd.
InstitutionCitigroup Inc
Latest Disclosed Ownership54,959 shares
Latest Disclosed Value $ 721,612
Citigroup Inc reports 93.43% increase in ownership of MRTN / Marten Transport, Ltd.

On May 11, 2026 - Citigroup Inc filed a 13F-HR form disclosing ownership of 54,959 shares of Marten Transport, Ltd. (US:MRTN) valued at $721,612 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 13, 2026 disclosing 28,413 shares of Marten Transport, Ltd.. This represents a change in shares of 93.43% during the quarter. The current value of the position is $962,882 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)
2026-05-11 2026-03-31 13F MARTEN TRANS COM 573075108 54,959 26,546 93.43 722 123.22 0.0002
2026-02-13 2025-12-31 13F MARTEN TRANS COM 573075108 28,413 1,497 5.56 323 12.94 0.0001
2025-11-10 2025-09-30 13F MARTEN TRANS COM 573075108 26,916 -33,467 -55.42 287 -63.52 0.0001
2025-08-11 2025-06-30 13F MARTEN TRANS COM 573075108 60,383 -32,674 -35.11 784 -38.56 0.0004
2025-05-12 2025-03-31 13F MARTEN TRANS COM 573075108 93,057 6,942 8.06 1,277 -5.06 0.0007
2025-02-12 2024-12-31 13F MARTEN TRANS COM 573075108 86,115 6,883 8.69 1,344 -4.14 0.0008
2024-11-12 2024-09-30 13F MARTEN TRANS COM 573075108 79,232 34,154 75.77 1,402 68.71 0.0008
2024-08-12 2024-06-30 13F MARTEN TRANS COM 573075108 45,078 6,071 15.56 832 15.42 0.0005
2024-05-10 2024-03-31 13F MARTEN TRANS COM 573075108 39,007 1,720 4.61 721 -7.93 0.0005
2024-02-09 2023-12-31 13F MARTEN TRANS COM 573075108 37,287 10,694 40.21 782 49.24 0.0006
2023-12-06 2023-09-30 13F/A-1 MARTEN TRANS COM 573075108 26,593 -39,963 -60.04 524 -63.36 0.0004
2023-11-09 2023-09-30 13F MARTEN TRANS COM 573075108 26,593 -39,963 524 0.0002
2023-08-10 2023-06-30 13F MARTEN TRANS COM 573075108 66,556 25,148 60.73 1,431 64.94 0.0009
2023-05-11 2023-03-31 13F MARTEN TRANS COM 573075108 41,408 -5,776 -12.24 867 -7.07 0.0006
2023-02-09 2022-12-31 13F MARTEN TRANS COM 573075108 47,184 7,708 19.53 933 23.41 0.0007
2022-11-10 2022-09-30 13F MARTEN TRANS COM 573075108 39,476 10,460 36.05 756 54.92 0.0005
2022-08-10 2022-06-30 13F MARTEN TRANS COM 573075108 29,016 -26,090 -47.35 488 -50.15 0.0004
2022-05-12 2022-03-31 13F MARTEN TRANS COM 573075108 55,106 6,494 13.36 979 17.39 0.0006
2022-02-10 2021-12-31 13F MARTEN TRANS COM 573075108 48,612 14,863 44.04 834 57.36 0.0004
2021-11-10 2021-09-30 13F MARTEN TRANS COM 573075108 33,749 -2,123 -5.92 530 -10.47 0.0003
2021-08-10 2021-06-30 13F MARTEN TRANS COM 573075108 35,872 28,257 371.07 592 358.91 0.0004
2021-05-13 2021-03-31 13F MARTEN TRANS COM 573075108 7,615 -12,258 -61.68 129 -62.28 0.0001
2021-02-11 2020-12-31 13F MARTEN TRANS COM 573075108 19,873 12,371 164.90 342 180.33 0.0002
2020-11-12 2020-09-30 13F MARTEN TRANS COM 573075108 7,502 -33,427 -81.67 122 -88.16 0.0001
2020-08-12 2020-06-30 13F MARTEN TRANS COM 573075108 40,929 26,968 193.17 1,030 258.89 0.0008
2020-05-12 2020-03-31 13F MARTEN TRANS COM 573075108 13,961 -32,763 -70.12 287 -71.41 0.0003
2020-02-12 2019-12-31 13F MARTEN TRANS COM 573075108 46,724 22,239 90.83 1,004 97.25 0.0007
2019-11-08 2019-09-30 13F MARTEN TRANS COM 573075108 24,485 -5,524 -18.41 509 -6.43 0.0004
2019-08-12 2019-06-30 13F MARTEN TRANS COM 573075108 30,009 6,025 25.12 544 27.10 0.0004
2019-05-13 2019-03-31 13F MARTEN TRANS COM 573075108 23,984 -2,208 -8.43 428 0.94 0.0004
2019-02-12 2018-12-31 13F MARTEN TRANS COM 573075108 26,192 -22 -0.08 424 -23.19 0.0004
2018-11-13 2018-09-30 13F MARTEN TRANS COM 573075108 26,214 17,842 213.12 552 181.63 0.0005
2018-08-10 2018-06-30 13F MARTEN TRANS COM 573075108 8,372 -5,170 -38.18 196 -36.57 0.0002
2018-05-11 2018-03-31 13F MARTEN TRANS COM 573075108 13,542 -1,722 -11.28 309 -0.32 0.0003
2018-02-12 2017-12-31 13F MARTEN TRANS COM 573075108 15,264 -15,400 -50.22 310 -50.87 0.0002
2017-11-13 2017-09-30 13F MARTEN TRANS COM 573075108 30,664 2,713 9.71 631 -17.62 0.0005
2017-08-11 2017-06-30 13F MARTEN TRANS COM 573075108 27,951 -4,615 -14.17 766 0.26 0.0007
2017-05-12 2017-03-31 13F MARTEN TRANS COM 573075108 32,566 -39,512 -54.82 764 -54.50 0.0007
2017-02-10 2016-12-31 13F MARTEN TRANS COM 573075108 72,078 54,097 300.86 1,679 344.18 0.0015
2016-11-10 2016-09-30 13F MARTEN TRANS COM 573075108 17,981 3,536 24.48 378 32.17 0.0004
2016-08-12 2016-06-30 13F MARTEN TRANS COM 573075108 14,445 -8,088 -35.89 286 -32.07 0.0003
2016-05-13 2016-03-31 13F MARTEN TRANS COM 573075108 22,533 10,873 93.25 421 104.37 0.0005
2016-02-12 2015-12-31 13F MARTEN TRANS COM 573075108 11,660 2,456 26.68 206 38.26 0.0002
2015-11-13 2015-09-30 13F MARTEN TRANS COM 573075108 9,204 7,636 486.99 149 325.71 0.0001
2015-08-13 2015-06-30 13F MARTEN TRANS COM 573075108 1,568 -679 -30.22 35 -32.69 0.0000
2015-05-14 2015-03-31 13F MARTEN TRANS COM 573075108 2,247 -2,883 -56.20 52 -53.98 0.0001
2015-02-17 2014-12-31 13F MARTEN TRANS COM 573075108 5,130 2,108 69.76 113 113.21 0.0001
2014-11-14 2014-09-30 13F MARTEN TRANS COM 573075108 3,022 -710 -19.02 53 -36.90 0.0000
2014-08-14 2014-06-30 13F MARTEN TRANS COM 573075108 3,732 -319 -7.87 84 -3.45 0.0001
2014-05-15 2014-03-31 13F MARTEN TRANS COM 573075108 4,051 -4,777 -54.11 87 -51.40 0.0001
2014-02-14 2013-12-31 13F MARTEN TRANS COM 573075108 8,828 4,326 96.09 179 132.47 0.0002
2013-11-14 2013-09-30 13F MARTEN TRANS COM 573075108 4,502 -5,773 -56.18 77 -52.17 0.0001
2013-08-14 2013-06-30 13F MARTEN TRANS COM 573075108 10,275 10,275 161 0.0002
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.