Tidewater Inc.
US ˙ NYSE ˙ US88642R1095

SecurityTDW / Tidewater Inc.
InstitutionDimensional Fund Advisors Lp
Latest Disclosed Ownership1,838,769 shares
Latest Disclosed Value $ 153,623,022
Dimensional Fund Advisors Lp reports 4.91% increase in ownership of TDW / Tidewater Inc.

On May 7, 2026 - Dimensional Fund Advisors Lp filed a 13F-HR form disclosing ownership of 1,838,769 shares of Tidewater Inc. (US:TDW) valued at $153,629,150 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 12, 2026 disclosing 1,752,685 shares of Tidewater Inc.. This represents a change in shares of 4.91% during the quarter. The current value of the position is $136,068,906 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 TIDEWATER INC COM 88642R109 1,838,769 86,084 4.91 153,623 73.53 0.0069
2026-02-12 2025-12-31 13F TIDEWATER INC COM 88642R109 1,752,685 215,145 13.99 88,529 7.96 0.0186
2025-11-12 2025-09-30 13F TIDEWATER INC COM 88642R109 1,537,540 -751 -0.05 81,999 15.55 0.0176
2025-08-12 2025-06-30 13F TIDEWATER INC COM 88642R109 1,538,291 -67,611 -4.21 70,966 4.54 0.0164
2025-05-13 2025-03-31 13F TIDEWATER INC COM 88642R109 1,605,902 54,173 3.49 67,886 -20.03 0.0169
2025-02-13 2024-12-31 13F TIDEWATER INC COM 88642R109 1,551,729 286,097 22.61 84,888 -6.57 0.0204
2024-11-07 2024-09-30 13F TIDEWATER INC COM 88642R109 1,265,632 -12,077 -0.95 90,859 -25.31 0.0220
2024-08-09 2024-06-30 13F TIDEWATER INC COM 88642R109 1,277,709 -214,757 -14.39 121,649 -11.40 0.0318
2024-05-10 2024-03-31 13F TIDEWATER INC COM 88642R109 1,492,466 -313,017 -17.34 137,307 5.46 0.0372
2024-02-07 2023-12-31 13F TIDEWATER INC COM 88642R109 1,805,483 31,292 1.76 130,195 3.25 0.0380
2023-11-09 2023-09-30 13F TIDEWATER INC COM 88642R109 1,774,191 -100,202 -5.35 126,096 21.36 0.0414
2023-08-09 2023-06-30 13F TIDEWATER INC COM 88642R109 1,874,393 50,729 2.78 103,905 29.25 0.0331
2023-05-12 2023-03-31 13F TIDEWATER INC COM 88642R109 1,823,664 263,179 16.87 80,389 140,931.58 0.0271
2023-02-09 2022-12-31 13F TIDEWATER INC COM 88642R109 1,560,485 187,015 13.62 58 -99.81 0.0170
2022-11-10 2022-09-30 13F TIDEWATER INC COM 88642R109 1,373,470 206,306 17.68 29,805 21.08 0.0114
2022-08-12 2022-06-30 13F TIDEWATER INC COM 88642R109 1,167,164 91,365 8.49 24,616 5.25 0.0088
2022-05-13 2022-03-31 13F TIDEWATER INC COM 88642R109 1,075,799 121,346 12.71 23,388 128.80 0.0072
2022-02-09 2021-12-31 13F TIDEWATER INC COM 88642R109 954,453 -44,908 -4.49 10,222 -15.19 0.0031
2021-11-12 2021-09-30 13F TIDEWATER INC COM 88642R109 999,361 -132,880 -11.74 12,053 -11.65 0.0039
2021-08-12 2021-06-30 13F TIDEWATER INC COM 88642R109 1,132,241 24,159 2.18 13,643 -1.74 0.0043
2021-05-14 2021-03-31 13F TIDEWATER INC COM 88642R109 1,108,082 24,661 2.28 13,884 48.32 0.0046
2021-03-08 2020-12-31 13F/A-2 TIDEWATER INC COM 88642R109 1,083,421 21,658 2.04 9,361 31.40 0.0034
2021-02-11 2020-12-31 13F TIDEWATER INC COM 88642R109 1,083,421 21,658 9,361 3,380.6956
2020-11-12 2020-09-30 13F TIDEWATER INC COM 88642R109 1,061,763 -14,352 -1.33 7,124 18.44 0.0030
2020-08-13 2020-06-30 13F TIDEWATER INC COM 88642R109 1,076,115 -11,693 -1.07 6,015 -21.89 0.0026
2020-05-14 2020-03-31 13F TIDEWATER INC COM 88642R109 1,087,808 91,748 9.21 7,701 -59.90 0.0040
2020-02-14 2019-12-31 13F TIDEWATER INC COM 88642R109 996,060 116,359 13.23 19,204 44.48 0.0070
2019-11-12 2019-09-30 13F TIDEWATER INC COM 88642R109 879,701 123,172 16.28 13,292 -25.17 0.0052
2019-08-13 2019-06-30 13F TIDEWATER INC COM 88642R109 756,529 305,038 67.56 17,763 69.66 0.0069
2019-08-12 2019-03-31 13F/A-2 TIDEWATER INC COM 88642R109 451,491 237,059 110.55 10,470 155.24 0.0042
2019-05-10 2019-03-31 13F TIDEWATER INC COM 88642R109 451,491 237,059 10,470
2019-02-26 2018-12-31 13F/A-1 TIDEWATER INC COM 88642R109 214,432 190,350 790.42 4,102 446.21 0.0019
2019-02-13 2018-12-31 13F TIDEWATER INC COM 88642R109 214,432 190,350 4,102
2018-11-13 2018-09-30 13F TIDEWATER INC COM 88642R109 24,082 6,009 33.25 751 43.59 0.0003
2018-08-10 2018-06-30 13F TIDEWATER INC COM 88642R109 18,073 4,729 35.44 523 36.91 0.0002
2018-05-11 2018-03-31 13F TIDEWATER INC COM 88642R109 13,344 -874,688 -98.50 382 -62.59 0.0002
2017-05-12 2017-03-31 13F TIDEWATER COM 886423102 888,032 -428,985 -32.57 1,021 -77.27 0.0005
2017-02-09 2016-12-31 13F TIDEWATER COM 886423102 1,317,017 -134,784 -9.28 4,491 9.70 0.0022
2016-11-10 2016-09-30 13F TIDEWATER COM 886423102 1,451,801 -29,225 -1.97 4,094 -37.32 0.0022
2016-08-09 2016-06-30 13F TIDEWATER COM 886423102 1,481,026 -12,404 -0.83 6,532 -35.95 0.0038
2016-05-13 2016-03-31 13F TIDEWATER COM 886423102 1,493,430 -3,280 -0.22 10,198 -2.10 0.0061
2016-02-10 2015-12-31 13F TIDEWATER COM 886423102 1,496,710 -76,189 -4.84 10,417 -49.60 0.0065
2015-11-13 2015-09-30 13F TIDEWATER COM 886423102 1,572,899 -22,902 -1.44 20,669 -43.02 0.0136
2015-08-14 2015-06-30 13F TIDEWATER COM 886423102 1,595,801 -185,139 -10.40 36,273 6.41 0.0222
2015-05-14 2015-03-31 13F TIDEWATER COM 886423102 1,780,940 -11,050 -0.62 34,088 -41.31 0.0215
2015-02-06 2014-12-31 13F TIDEWATER COM 886423102 1,791,990 86,927 5.10 58,080 -12.73 0.0381
2014-11-13 2014-09-30 13F TIDEWATER COM 886423102 1,705,063 298,114 21.19 66,553 -15.75 0.0472
2014-08-08 2014-06-30 13F TIDEWATER COM 886423102 1,406,949 130,510 10.22 78,999 27.30 0.0549
2014-05-14 2014-03-31 13F TIDEWATER COM 886423102 1,276,439 -33,165 -2.53 62,059 -20.04 0.0464
2014-02-12 2013-12-31 13F TIDEWATER COM 886423102 1,309,604 29,929 2.34 77,615 2.30 0.0605
2013-11-13 2013-09-30 13F TIDEWATER COM 886423102 1,279,675 24,498 1.95 75,868 6.10 0.0657
2013-08-15 2013-06-30 13F TIDEWATER COM 886423102 1,255,177 1,255,177 71,509 0.0673
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.