Transocean Ltd.
US ˙ NYSE ˙ CH0048265513

SecurityRIG / Transocean Ltd.
InstitutionDimensional Fund Advisors Lp
Latest Disclosed Ownership48,819,576 shares
Latest Disclosed Value $ 323,682,016
Dimensional Fund Advisors Lp reports 12.31% increase in ownership of RIG / Transocean Ltd.

On May 7, 2026 - Dimensional Fund Advisors Lp filed a 13F-HR form disclosing ownership of 48,819,576 shares of Transocean Ltd. (US:RIG) valued at $323,673,789 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 12, 2026 disclosing 43,470,312 shares of Transocean Ltd.. This represents a change in shares of 12.31% during the quarter. The current value of the position is $301,704,980 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 TRANSOCEAN REGISTERED SHS H8817H100 48,819,576 5,349,264 12.31 323,682 80.29 0.0145
2026-02-12 2025-12-31 13F TRANSOCEAN REGISTERED SHS H8817H100 43,470,312 7,516,589 20.91 179,531 60.05 0.0377
2025-11-12 2025-09-30 13F TRANSOCEAN REGISTERED SHS H8817H100 35,953,723 -2,947,804 -7.58 112,174 11.33 0.0241
2025-08-12 2025-06-30 13F TRANSOCEAN REGISTERED SHS H8817H100 38,901,527 -1,758,912 -4.33 100,755 -21.83 0.0233
2025-05-13 2025-03-31 13F TRANSOCEAN REGISTERED SHS H8817H100 40,660,439 651,843 1.63 128,894 -14.09 0.0320
2025-02-13 2024-12-31 13F TRANSOCEAN REGISTERED SHS H8817H100 40,008,596 809,864 2.07 150,029 -9.95 0.0360
2024-11-07 2024-09-30 13F TRANSOCEAN REGISTERED SHS H8817H100 39,198,732 2,472,737 6.73 166,597 -15.21 0.0404
2024-08-09 2024-06-30 13F TRANSOCEAN REGISTERED SHS H8817H100 36,725,995 5,856,414 18.97 196,484 1.35 0.0513
2024-05-10 2024-03-31 13F TRANSOCEAN REGISTERED SHS H8817H100 30,869,581 -4,821,039 -13.51 193,861 -14.46 0.0525
2024-02-07 2023-12-31 13F TRANSOCEAN REG SHS H8817H100 35,690,620 6,719,483 23.19 226,641 -4.72 0.0662
2023-11-09 2023-09-30 13F TRANSOCEAN REG SHS H8817H100 28,971,137 9,158,330 46.22 237,864 71.29 0.0780
2023-08-09 2023-06-30 13F TRANSOCEAN REG SHS H8817H100 19,812,807 266,743 1.36 138,867 11.70 0.0443
2023-05-12 2023-03-31 13F TRANSOCEAN REG SHS H8817H100 19,546,064 2,833,074 16.95 124,317 163,475.00 0.0419
2023-02-09 2022-12-31 13F TRANSOCEAN REG SHS H8817H100 16,712,990 1,378,583 8.99 76 -99.80 0.0225
2022-11-10 2022-09-30 13F TRANSOCEAN REG SHS H8817H100 15,334,407 -1,790,807 -10.46 37,877 -33.59 0.0145
2022-08-12 2022-06-30 13F TRANSOCEAN REG SHS H8817H100 17,125,214 4,200,901 32.50 57,031 -3.45 0.0205
2022-05-13 2022-03-31 13F TRANSOCEAN CLA H8817H100 12,924,313 535,577 4.32 59,071 72.75 0.0182
2022-02-09 2021-12-31 13F TRANSOCEAN CLA H8817H100 12,388,736 -446,826 -3.48 34,195 -29.71 0.0103
2021-11-12 2021-09-30 13F TRANSOCEAN CLA H8817H100 12,835,562 -2,119,586 -14.17 48,648 -28.04 0.0157
2021-08-12 2021-06-30 13F TRANSOCEAN CLA H8817H100 14,955,148 9,107,350 155.74 67,601 225.69 0.0214
2021-05-14 2021-03-31 13F TRANSOCEAN CLA H8817H100 5,847,798 3,763,847 180.61 20,756 331.25 0.0069
2021-03-08 2020-12-31 13F/A-2 TRANSOCEAN CLA H8817H100 2,083,951 -1,565,236 -42.89 4,813 63.37 0.0017
2021-02-11 2020-12-31 13F TRANSOCEAN CLA H8817H100 2,083,951 -1,565,236 4,813 1,738.1998
2020-11-12 2020-09-30 13F TRANSOCEAN CLA H8817H100 3,649,187 -102,975 -2.74 2,946 -57.08 0.0012
2020-08-13 2020-06-30 13F TRANSOCEAN CLA H8817H100 3,752,162 -5,413,739 -59.06 6,864 -35.43 0.0030
2020-05-14 2020-03-31 13F TRANSOCEAN CLA H8817H100 9,165,901 427,487 4.89 10,631 -82.32 0.0055
2020-02-14 2019-12-31 13F TRANSOCEAN CLA H8817H100 8,738,414 -140,194 -1.58 60,117 51.47 0.0219
2019-11-12 2019-09-30 13F TRANSOCEAN CLA H8817H100 8,878,608 489,326 5.83 39,690 -26.19 0.0154
2019-08-13 2019-06-30 13F TRANSOCEAN CLA H8817H100 8,389,282 895,295 11.95 53,774 -17.62 0.0209
2019-08-12 2019-03-31 13F/A-2 TRANSOCEAN CLA H8817H100 7,493,987 14,217 0.19 65,278 25.74 0.0260
2019-05-10 2019-03-31 13F TRANSOCEAN CLA H8817H100 7,493,987 14,217 65,278
2019-02-26 2018-12-31 13F/A-1 TRANSOCEAN CLA H8817H100 7,479,770 142,562 1.94 51,913 -49.28 0.0235
2019-02-13 2018-12-31 13F TRANSOCEAN CLA H8817H100 7,479,770 142,562 51,913
2018-11-13 2018-09-30 13F TRANSOCEAN CLA H8817H100 7,337,208 659,298 9.87 102,351 14.04 0.0390
2018-08-10 2018-06-30 13F TRANSOCEAN CLA H8817H100 6,677,910 -4,334,639 -39.36 89,751 -17.68 0.0358
2018-05-11 2018-03-31 13F TRANSOCEAN CLA H8817H100 11,012,549 1,478,859 15.51 109,024 7.07 0.0454
2018-02-12 2017-12-31 13F TRANSOCEAN CLA H8817H100 9,533,690 -3,195,674 -25.10 101,821 -25.66 0.0422
2017-11-13 2017-09-30 13F TRANSOCEAN CLA H8817H100 12,729,364 135,470 1.08 136,965 32.14 0.0599
2017-08-11 2017-06-30 13F TRANSOCEAN CLA H8817H100 12,593,894 210,390 1.70 103,650 -32.77 0.0479
2017-05-12 2017-03-31 13F TRANSOCEAN CLA H8817H100 12,383,504 1,254,887 11.28 154,170 -6.02 0.0737
2017-02-09 2016-12-31 13F TRANSOCEAN CLA H8817H100 11,128,617 770,565 7.44 164,037 48.56 0.0819
2016-11-10 2016-09-30 13F TRANSOCEAN CLA H8817H100 10,358,052 2,428,623 30.63 110,417 17.12 0.0597
2016-08-09 2016-06-30 13F TRANSOCEAN CLA H8817H100 7,929,429 601,808 8.21 94,275 40.77 0.0542
2016-05-13 2016-03-31 13F TRANSOCEAN CLA H8817H100 7,327,621 2,487,299 51.39 66,969 11.76 0.0401
2016-02-10 2015-12-31 13F TRANSOCEAN CLA H8817H100 4,840,322 602,670 14.22 59,920 9.47 0.0373
2015-11-13 2015-09-30 13F TRANSOCEAN CLA H8817H100 4,237,652 348,994 8.97 54,737 -12.68 0.0359
2015-08-14 2015-06-30 13F TRANSOCEAN CLA H8817H100 3,888,658 927,973 31.34 62,684 44.33 0.0384
2015-05-14 2015-03-31 13F TRANSOCEAN CLA H8817H100 2,960,685 -119,675 -3.89 43,431 -23.09 0.0274
2015-02-06 2014-12-31 13F TRANSOCEAN CLA H8817H100 3,080,360 54,733 1.81 56,473 -41.63 0.0371
2014-11-13 2014-09-30 13F TRANSOCEAN CLA H8817H100 3,025,627 404,523 15.43 96,747 -18.02 0.0685
2014-08-08 2014-06-30 13F TRANSOCEAN CLA H8817H100 2,621,104 36,902 1.43 118,014 10.49 0.0820
2014-05-14 2014-03-31 13F TRANSOCEAN CLA H8817H100 2,584,202 72,197 2.87 106,810 -13.95 0.0798
2014-02-12 2013-12-31 13F TRANSOCEAN CLA H8817H100 2,512,005 168,067 7.17 124,129 19.00 0.0967
2013-11-13 2013-09-30 13F TRANSOCEAN CLA H8817H100 2,343,938 46,070 2.00 104,306 -5.35 0.0903
2013-08-15 2013-06-30 13F TRANSOCEAN CLA H8817H100 2,297,868 2,297,868 110,197 0.1038
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.