Marten Transport, Ltd.
US ˙ NasdaqGS ˙ US5730751089

SecurityMRTN / Marten Transport, Ltd.
InstitutionDimensional Fund Advisors Lp
Latest Disclosed Ownership4,855,737 shares
Ownership 6.00%
Dimensional Fund Advisors Lp ownership in MRTN / Marten Transport, Ltd.

2026-01-21 - Dimensional Fund Advisors Lp has filed an SCHEDULE 13G/A form with the Securities and Exchange Commission (SEC) disclosing ownership of 4,855,737 shares of Marten Transport, Ltd. (US:MRTN). This represents 6.0 percent ownership of the company. In their previous filing dated 2024-02-09 , Dimensional Fund Advisors Lp had reported owning 5,839,975 shares, indicating a decrease of -16.85 percent.

Institutional Ownership: 13D/G Filings

This table shows a history of the 13D/G filings made by the investor and/or investor group. Note that the share values in this table are not directly comparable to any numbers shown in the 13F table (if any).

File
Date		Effective
Date		Form Prev
Shares		 Latest
Shares		 ΔShares
(Percent)		 Ownership
(Percent)		 ΔOwnership
(Percent)
2026-01-21 2026-01-21 13G/A 5,839,975 4,855,737 -16.85 6.00 -16.67
2024-02-09 2024-02-09 13G/A 6,037,923 5,839,975 -3.28 7.20 -2.70
2023-02-10 2023-02-10 13G/A 5,950,614 6,037,923 1.47 7.40 2.78
2022-02-08 2022-02-08 13G/A 6,389,331 5,950,614 -6.87 7.20 -6.49
2021-02-12 2021-02-12 13G/A 4,548,220 6,389,331 40.48 7.70 -7.45
2020-02-12 2020-02-12 13G/A 4,563,975 4,548,220 -0.35 8.32 -0.72
2019-02-08 2019-02-08 13G/A 4,582,170 4,563,975 -0.40 8.38 -0.24
2018-02-09 2018-02-09 13G/A 2,834,710 4,582,170 61.65 8.40 -3.45
2017-02-09 2017-02-09 13G/A 2,853,827 2,834,710 -0.67 8.70 2.47
2016-02-09 2016-02-09 13G/A 2,853,827 8.49
2015-02-05 2015-02-05 13G/A 2,822,964 8.45
2014-02-10 2014-02-10 13G/A 2,728,991 8.21
2013-02-11 2013-02-11 13G/A 1,718,474 7.79
2012-02-14 2012-02-14 13G/A 1,679,330 7.64

Important Note: One of the primary uses of the 13D/G filings is to evaluate the ability of a firm to control a company (ie, the "beneficial ownership"). To that end, firms are required to report not just direct holdings in companies, but indirect holdings that they control. For investment firms, these indirect holdings can include shares in funds they manage, advisory accounts, and in the case of activist campaigns, pledged votes. Therefore, share counts listed in 13D/G filings can differ significantly than share counts listed in 13F filings.

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)
2026-05-07 2026-03-31 13F MARTEN TRANS COM 573075108 4,893,498 37,761 0.78 64,250 16.27 0.0029
2026-02-12 2025-12-31 13F MARTEN TRANS COM 573075108 4,855,737 -270,441 -5.28 55,259 1.12 0.0116
2025-11-12 2025-09-30 13F MARTEN TRANS COM 573075108 5,126,178 -156,779 -2.97 54,645 -20.37 0.0117
2025-08-12 2025-06-30 13F MARTEN TRANS COM 573075108 5,282,957 -222,431 -4.04 68,626 -9.15 0.0159
2025-05-13 2025-03-31 13F MARTEN TRANS COM 573075108 5,505,388 -245,157 -4.26 75,533 -15.85 0.0188
2025-02-13 2024-12-31 13F MARTEN TRANS COM 573075108 5,750,545 -70,810 -1.22 89,766 -12.88 0.0216
2024-11-07 2024-09-30 13F MARTEN TRANS COM 573075108 5,821,355 -9,836 -0.17 103,038 -4.23 0.0250
2024-08-09 2024-06-30 13F MARTEN TRANS COM 573075108 5,831,191 14,660 0.25 107,585 0.09 0.0281
2024-05-10 2024-03-31 13F MARTEN TRANS COM 573075108 5,816,531 -23,444 -0.40 107,489 -12.27 0.0291
2024-02-07 2023-12-31 13F MARTEN TRANS COM 573075108 5,839,975 27,091 0.47 122,524 6.94 0.0358
2023-11-09 2023-09-30 13F MARTEN TRANS COM 573075108 5,812,884 -11,029 -0.19 114,573 -8.50 0.0376
2023-08-09 2023-06-30 13F MARTEN TRANS COM 573075108 5,823,913 -13,023 -0.22 125,216 2.40 0.0399
2023-05-12 2023-03-31 13F MARTEN TRANS COM 573075108 5,836,936 -200,987 -3.33 122,281 102,657.14 0.0412
2023-02-09 2022-12-31 13F MARTEN TRANS COM 573075108 6,037,923 41,294 0.69 119 -99.90 0.0353
2022-11-10 2022-09-30 13F MARTEN TRANS COM 573075108 5,996,629 61,270 1.03 114,902 15.10 0.0441
2022-08-12 2022-06-30 13F MARTEN TRANS COM 573075108 5,935,359 -56,209 -0.94 99,831 -6.19 0.0358
2022-05-13 2022-03-31 13F MARTEN TRANS COM 573075108 5,991,568 40,954 0.69 106,413 4.21 0.0328
2022-02-09 2021-12-31 13F MARTEN TRANS COM 573075108 5,950,614 -70,605 -1.17 102,112 8.08 0.0309
2021-11-12 2021-09-30 13F MARTEN TRANS COM 573075108 6,021,219 -33,070 -0.55 94,474 -5.37 0.0304
2021-08-12 2021-06-30 13F MARTEN TRANS COM 573075108 6,054,289 -158,957 -2.56 99,835 -5.54 0.0316
2021-05-14 2021-03-31 13F MARTEN TRANS COM 573075108 6,213,246 -176,085 -2.76 105,688 -4.00 0.0350
2021-03-08 2020-12-31 13F/A-2 MARTEN TRANS COM 573075108 6,389,331 -277,335 -4.16 110,088 1.18 0.0398
2021-02-11 2020-12-31 13F MARTEN TRANS COM 573075108 6,389,331 -277,335 110,088 39,757.9341
2020-11-12 2020-09-30 13F MARTEN TRANS COM 573075108 6,666,666 2,174,700 48.41 108,802 -3.73 0.0461
2020-08-13 2020-06-30 13F MARTEN TRANS COM 573075108 4,491,966 -55,216 -1.21 113,016 21.13 0.0497
2020-05-14 2020-03-31 13F MARTEN TRANS COM 573075108 4,547,182 -1,038 -0.02 93,304 -4.54 0.0486
2020-02-14 2019-12-31 13F MARTEN TRANS COM 573075108 4,548,220 -33,565 -0.73 97,741 2.66 0.0356
2019-11-12 2019-09-30 13F MARTEN TRANS COM 573075108 4,581,785 -15,113 -0.33 95,211 14.12 0.0370
2019-08-13 2019-06-30 13F MARTEN TRANS COM 573075108 4,596,898 61,250 1.35 83,432 3.17 0.0324
2019-08-12 2019-03-31 13F/A-2 MARTEN TRANS COM 573075108 4,535,648 -28,327 -0.62 80,870 9.44 0.0322
2019-05-10 2019-03-31 13F MARTEN TRANS COM 573075108 4,535,648 -28,327 80,870
2019-02-26 2018-12-31 13F/A-1 MARTEN TRANS COM 573075108 4,563,975 42,170 0.93 73,891 -22.37 0.0335
2019-02-13 2018-12-31 13F MARTEN TRANS COM 573075108 4,563,975 42,170 73,891
2018-11-13 2018-09-30 13F MARTEN TRANS COM 573075108 4,521,805 -4,725 -0.10 95,183 -10.33 0.0362
2018-08-10 2018-06-30 13F MARTEN TRANS COM 573075108 4,526,530 -29,033 -0.64 106,146 2.19 0.0423
2018-05-11 2018-03-31 13F MARTEN TRANS COM 573075108 4,555,563 -26,607 -0.58 103,867 11.66 0.0433
2018-02-12 2017-12-31 13F MARTEN TRANS COM 573075108 4,582,170 -31,104 -0.67 93,018 -1.88 0.0386
2017-11-13 2017-09-30 13F MARTEN TRANS COM 573075108 4,613,274 1,814,763 64.85 94,798 23.63 0.0414
2017-08-11 2017-06-30 13F MARTEN TRANS COM 573075108 2,798,511 -12,322 -0.44 76,679 16.33 0.0354
2017-05-12 2017-03-31 13F MARTEN TRANS COM 573075108 2,810,833 -23,877 -0.84 65,915 -0.20 0.0315
2017-02-09 2016-12-31 13F MARTEN TRANS COM 573075108 2,834,710 -11,639 -0.41 66,049 10.50 0.0330
2016-11-10 2016-09-30 13F MARTEN TRANS COM 573075108 2,846,349 -5,037 -0.18 59,773 5.87 0.0323
2016-08-09 2016-06-30 13F MARTEN TRANS COM 573075108 2,851,386 -5,333 -0.19 56,458 5.57 0.0325
2016-05-13 2016-03-31 13F MARTEN TRANS COM 573075108 2,856,719 2,892 0.10 53,478 5.87 0.0320
2016-02-10 2015-12-31 13F MARTEN TRANS COM 573075108 2,853,827 1,182 0.04 50,513 9.51 0.0315
2015-11-13 2015-09-30 13F MARTEN TRANS COM 573075108 2,852,645 1,638 0.06 46,128 -25.44 0.0303
2015-08-14 2015-06-30 13F MARTEN TRANS COM 573075108 2,851,007 13,629 0.48 61,865 -6.02 0.0379
2015-05-14 2015-03-31 13F MARTEN TRANS COM 573075108 2,837,378 14,414 0.51 65,825 6.67 0.0416
2015-02-06 2014-12-31 13F MARTEN TRANS COM 573075108 2,822,964 -7,516 -0.27 61,711 22.42 0.0405
2014-11-13 2014-09-30 13F MARTEN TRANS COM 573075108 2,830,480 30,001 1.07 50,411 -19.46 0.0357
2014-08-08 2014-06-30 13F MARTEN TRANS COM 573075108 2,800,479 18,584 0.67 62,589 4.55 0.0435
2014-05-14 2014-03-31 13F MARTEN TRANS COM 573075108 2,781,895 52,904 1.94 59,864 8.65 0.0447
2014-02-12 2013-12-31 13F MARTEN TRANS COM 573075108 2,728,991 36,811 1.37 55,097 19.33 0.0429
2013-11-13 2013-09-30 13F MARTEN TRANS COM 573075108 2,692,180 58,997 2.24 46,171 11.90 0.0400
2013-08-15 2013-06-30 13F MARTEN TRANS COM 573075108 2,633,183 2,633,183 41,261 0.0389
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.