Kirby Corporation
US ˙ NYSE ˙ US4972661064

SecurityKEX / Kirby Corporation
InstitutionDimensional Fund Advisors Lp
Latest Disclosed Ownership2,617,538 shares
Latest Disclosed Value $ 347,828,792
Dimensional Fund Advisors Lp reports 5.35% increase in ownership of KEX / Kirby Corporation

On May 7, 2026 - Dimensional Fund Advisors Lp filed a 13F-HR form disclosing ownership of 2,617,538 shares of Kirby Corporation (US:KEX) valued at $347,818,449 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 12, 2026 disclosing 2,484,508 shares of Kirby Corporation. This represents a change in shares of 5.35% during the quarter. The current value of the position is $369,203,735 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)
2026-05-07 2026-03-31 13F KIRBY COM 497266106 2,617,538 133,030 5.35 347,829 27.06 0.0156
2026-02-12 2025-12-31 13F KIRBY COM 497266106 2,484,508 93,676 3.92 273,745 37.20 0.0574
2025-11-12 2025-09-30 13F KIRBY COM 497266106 2,390,832 4,927 0.21 199,518 -26.27 0.0428
2025-08-12 2025-06-30 13F KIRBY COM 497266106 2,385,905 18,790 0.79 270,594 13.17 0.0626
2025-05-13 2025-03-31 13F KIRBY COM 497266106 2,367,115 -8,204 -0.35 239,097 -4.86 0.0594
2025-02-13 2024-12-31 13F KIRBY COM 497266106 2,375,319 -96,607 -3.91 251,310 -16.96 0.0604
2024-11-07 2024-09-30 13F KIRBY COM 497266106 2,471,926 -216,562 -8.06 302,649 -5.98 0.0734
2024-08-09 2024-06-30 13F KIRBY COM 497266106 2,688,488 -67,744 -2.46 321,895 22.52 0.0841
2024-05-10 2024-03-31 13F KIRBY COM 497266106 2,756,232 131,961 5.03 262,724 27.56 0.0711
2024-02-07 2023-12-31 13F KIRBY COM 497266106 2,624,271 62,378 2.43 205,954 -2.91 0.0601
2023-11-09 2023-09-30 13F KIRBY COM 497266106 2,561,893 78,191 3.15 212,130 10.99 0.0696
2023-08-09 2023-06-30 13F KIRBY COM 497266106 2,483,702 68,693 2.84 191,118 13.54 0.0609
2023-05-12 2023-03-31 13F KIRBY COM 497266106 2,415,009 126,725 5.54 168,322 114,404.76 0.0567
2023-02-09 2022-12-31 13F KIRBY COM 497266106 2,288,284 62,063 2.79 147 -99.89 0.0435
2022-11-10 2022-09-30 13F KIRBY COM 497266106 2,226,221 75,994 3.53 135,287 3.42 0.0519
2022-08-12 2022-06-30 13F KIRBY COM 497266106 2,150,227 166,282 8.38 130,817 -8.66 0.0469
2022-05-13 2022-03-31 13F KIRBY COM 497266106 1,983,945 262,640 15.26 143,227 40.04 0.0441
2022-02-09 2021-12-31 13F KIRBY COM 497266106 1,721,305 -206,233 -10.70 102,278 10.63 0.0309
2021-11-12 2021-09-30 13F KIRBY COM 497266106 1,927,538 -52,177 -2.64 92,452 -22.99 0.0298
2021-08-12 2021-06-30 13F KIRBY COM 497266106 1,979,715 163,179 8.98 120,048 9.62 0.0380
2021-05-14 2021-03-31 13F KIRBY COM 497266106 1,816,536 89,557 5.19 109,510 22.34 0.0362
2021-03-08 2020-12-31 13F/A-2 KIRBY COM 497266106 1,726,979 -8,956 -0.52 89,511 42.56 0.0323
2021-02-11 2020-12-31 13F KIRBY COM 497266106 1,726,979 -8,956 89,511 32,326.6154
2020-11-12 2020-09-30 13F KIRBY COM 497266106 1,735,935 -161,303 -8.50 62,787 -38.21 0.0266
2020-08-13 2020-06-30 13F KIRBY COM 497266106 1,897,238 360,594 23.47 101,615 52.13 0.0447
2020-05-14 2020-03-31 13F KIRBY COM 497266106 1,536,644 191,097 14.20 66,794 -44.55 0.0348
2020-02-14 2019-12-31 13F KIRBY COM 497266106 1,345,547 -79,386 -5.57 120,467 2.90 0.0439
2019-11-12 2019-09-30 13F KIRBY COM 497266106 1,424,933 65,761 4.84 117,073 9.03 0.0455
2019-08-13 2019-06-30 13F KIRBY COM 497266106 1,359,172 -345,253 -20.26 107,372 -16.13 0.0417
2019-08-12 2019-03-31 13F/A-2 KIRBY COM 497266106 1,704,425 -41,252 -2.36 128,025 8.88 0.0510
2019-05-10 2019-03-31 13F KIRBY COM 497266106 1,704,425 -41,252 128,025
2019-02-26 2018-12-31 13F/A-1 KIRBY COM 497266106 1,745,677 -20,516 -1.16 117,588 -19.05 0.0533
2019-02-13 2018-12-31 13F KIRBY COM 497266106 1,745,677 -20,516 117,588
2018-11-13 2018-09-30 13F KIRBY COM 497266106 1,766,193 -147,768 -7.72 145,267 -9.21 0.0553
2018-08-10 2018-06-30 13F KIRBY COM 497266106 1,913,961 -256,325 -11.81 160,007 -4.19 0.0638
2018-05-11 2018-03-31 13F KIRBY COM 497266106 2,170,286 -194,613 -8.23 167,004 5.71 0.0696
2018-02-12 2017-12-31 13F KIRBY COM 497266106 2,364,899 190,873 8.78 157,977 10.18 0.0655
2017-11-13 2017-09-30 13F KIRBY COM 497266106 2,174,026 246,064 12.76 143,380 11.25 0.0627
2017-08-11 2017-06-30 13F KIRBY COM 497266106 1,927,962 24,514 1.29 128,885 -4.02 0.0595
2017-05-12 2017-03-31 13F KIRBY COM 497266106 1,903,448 195,368 11.44 134,285 18.22 0.0642
2017-02-09 2016-12-31 13F KIRBY COM 497266106 1,708,080 -28,531 -1.64 113,591 5.24 0.0567
2016-11-10 2016-09-30 13F KIRBY COM 497266106 1,736,611 140,431 8.80 107,936 8.37 0.0583
2016-08-09 2016-06-30 13F KIRBY COM 497266106 1,596,180 79,516 5.24 99,600 8.92 0.0573
2016-05-13 2016-03-31 13F KIRBY COM 497266106 1,516,664 216,683 16.67 91,443 33.68 0.0547
2016-02-10 2015-12-31 13F KIRBY COM 497266106 1,299,981 259,980 25.00 68,406 6.18 0.0426
2015-11-13 2015-09-30 13F KIRBY COM 497266106 1,040,001 388,740 59.69 64,427 29.04 0.0423
2015-08-14 2015-06-30 13F KIRBY COM 497266106 651,261 158,532 32.17 49,928 35.04 0.0306
2015-05-14 2015-03-31 13F KIRBY COM 497266106 492,729 595 0.12 36,973 -6.95 0.0233
2015-02-06 2014-12-31 13F KIRBY COM 497266106 492,134 36,237 7.95 39,736 -26.05 0.0261
2014-11-13 2014-09-30 13F KIRBY COM 497266106 455,897 109,081 31.45 53,734 32.28 0.0381
2014-08-08 2014-06-30 13F KIRBY COM 497266106 346,816 60,871 21.29 40,620 40.32 0.0282
2014-05-14 2014-03-31 13F KIRBY COM 497266106 285,945 939 0.33 28,948 2.35 0.0216
2014-02-12 2013-12-31 13F KIRBY COM 497266106 285,006 12,010 4.40 28,283 19.73 0.0220
2013-11-13 2013-09-30 13F KIRBY COM 497266106 272,996 13,212 5.09 23,623 14.34 0.0204
2013-08-15 2013-06-30 13F KIRBY COM 497266106 259,784 259,784 20,661 0.0195
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.