Transocean Ltd.
US ˙ NYSE ˙ CH0048265513

SecurityRIG / Transocean Ltd.
InstitutionMorgan Stanley
Latest Disclosed Ownership21,693,064 shares
Latest Disclosed Value $ 143,825,020
Morgan Stanley reports 12.49% decrease in ownership of RIG / Transocean Ltd.

On May 15, 2026 - Morgan Stanley filed a 13F-HR form disclosing ownership of 21,693,064 shares of Transocean Ltd. (US:RIG) valued at $143,825,014 USD as of March 31, 2026. The entity filed a previous 13F-HR/A on May 27, 2026 disclosing 24,790,325 shares of Transocean Ltd.. This represents a change in shares of -12.49% during the quarter. The current value of the position is $134,063,136 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)
2026-05-15 2026-03-31 13F TRANSOCEAN REGISTERED SHS H8817H100 21,693,064 -3,097,261 -12.49 143,825 40.48 0.0087
2026-05-27 2025-12-31 13F/A-1 TRANSOCEAN REGISTERED SHS H8817H100 24,790,325 2,135,964 9.43 102,384 44.85 0.0061
2026-02-13 2025-12-31 13F TRANSOCEAN REGISTERED SHS H8817H100 24,790,325 2,135,964 102,384 0.0061
2026-05-27 2025-09-30 13F/A-1 TRANSOCEAN REGISTERED SHS H8817H100 22,654,361 4,230,367 22.96 70,682 48.12 0.0043
2025-11-14 2025-09-30 13F TRANSOCEAN REGISTERED SHS H8817H100 22,654,361 4,230,367 70,682 0.0043
2025-08-15 2025-06-30 13F TRANSOCEAN REGISTERED SHS H8817H100 18,423,994 6,480,573 54.26 47,718 26.04 0.0031
2025-05-15 2025-03-31 13F TRANSOCEAN REGISTERED SHS H8817H100 11,943,421 -1,982,480 -14.24 37,861 -27.50 0.0027
2025-05-15 2024-12-31 13F/A-1 TRANSOCEAN REGISTERED SHS H8817H100 13,925,901 -4,367,668 -23.88 52,222 -32.83 0.0037
2025-02-14 2024-12-31 13F TRANSOCEAN REGISTERED SHS H8817H100 13,925,901 -4,367,668 52,222 0.0037
2025-05-14 2024-09-30 13F/A-2 TRANSOCEAN REGISTERED SHS H8817H100 18,293,569 -5,377,654 -22.72 77,748 -38.61 0.0056
2025-02-14 2024-09-30 13F/A-1 TRANSOCEAN REGISTERED SHS H8817H100 18,293,569 -5,377,654 77,748 0.0056
2024-11-14 2024-09-30 13F TRANSOCEAN REGISTERED SHS H8817H100 18,293,569 -5,377,654 77,748 0.0056
2025-05-14 2024-06-30 13F/A-2 TRANSOCEAN REGISTERED SHS H8817H100 23,671,223 4,757,380 25.15 126,641 6.62 0.0098
2024-10-17 2024-06-30 13F/A-1 TRANSOCEAN REGISTERED SHS H8817H100 23,671,223 4,757,380 126,641 0.0098
2024-08-14 2024-06-30 13F TRANSOCEAN REGISTERED SHS H8817H100 23,671,223 4,757,380 126,641 0.0098
2024-10-17 2024-03-31 13F/A-2 TRANSOCEAN REGISTERED SHS H8817H100 18,913,843 3,925,430 26.19 118,779 24.80 0.0095
2024-08-16 2024-03-31 13F/A-1 TRANSOCEAN REGISTERED SHS H8817H100 18,913,843 3,925,430 118,779 0.0095
2024-05-15 2024-03-31 13F TRANSOCEAN REGISTERED SHS H8817H100 18,913,843 3,925,430 118,779 0.0095
2024-08-16 2023-12-31 13F/A-1 TRANSOCEAN REG SHS H8817H100 14,988,413 -586,119 -3.76 95,176 -25.57 0.0084
2024-02-13 2023-12-31 13F TRANSOCEAN REG SHS H8817H100 14,988,413 -586,119 95,176 0.0084
2023-11-15 2023-09-30 13F TRANSOCEAN REG SHS H8817H100 15,574,532 -1,443,172 -8.48 127,867 7.19 0.0130
2023-08-14 2023-06-30 13F TRANSOCEAN REG SHS H8817H100 17,017,704 -1,222,170 -6.70 119,294 2.84 0.0118
2023-05-15 2023-03-31 13F TRANSOCEAN REG SHS H8817H100 18,239,874 -90,483 -0.49 116,006 38.79 0.0124
2023-02-14 2022-12-31 13F TRANSOCEAN REG SHS H8817H100 18,330,357 6,925,085 60.72 83,586 196.70 0.0095
2022-11-14 2022-09-30 13F TRANSOCEAN REG SHS H8817H100 11,405,272 2,589,943 29.38 28,172 -4.04 0.0038
2022-10-27 2022-06-30 13F/A-1 TRANSOCEAN REG SHS H8817H100 8,815,329 -249,619 -2.75 29,357 -29.13 0.0038
2022-08-15 2022-06-30 13F TRANSOCEAN REG SHS H8817H100 8,815,329 -249,619 29,357 0.0038
2022-10-27 2022-03-31 13F/A-1 TRANSOCEAN REG SHS H8817H100 9,064,948 2,350,008 35.00 41,426 123.53 0.0056
2022-05-13 2022-03-31 13F TRANSOCEAN REG SHS H8817H100 9,064,948 2,350,008 41,426 0.0056
2022-02-14 2021-12-31 13F TRANSOCEAN REG SHS H8817H100 6,714,940 -366,895 -5.18 18,533 -30.95 0.0023
2021-11-15 2021-09-30 13F TRANSOCEAN REG SHS H8817H100 7,081,835 -761,627 -9.71 26,841 -24.29 0.0036
2021-08-23 2021-06-30 13F/A-1 TRANSOCEAN REG SHS H8817H100 7,843,462 4,994,272 175.29 35,452 250.49 0.0047
2021-08-16 2021-06-30 13F TRANSOCEAN REG SHS H8817H100 7,843,462 4,994,272 35,452 0.0047
2021-05-17 2021-03-31 13F TRANSOCEAN REG SHS H8817H100 2,849,190 312,377 12.31 10,115 72.61 0.0015
2021-02-16 2020-12-31 13F TRANSOCEAN REG SHS H8817H100 2,536,813 409,325 19.24 5,860 241.49 0.0009
2020-11-13 2020-09-30 13F TRANSOCEAN REG SHS H8817H100 2,127,488 -1,292,747 -37.80 1,716 -72.58 0.0003
2020-08-14 2020-06-30 13F TRANSOCEAN REG SHS H8817H100 3,420,235 -11,155,257 -76.53 6,258 -62.99 0.0014
2020-05-26 2020-03-31 13F/A-1 TRANSOCEAN REG SHS H8817H100 14,575,492 11,471,457 369.57 16,908 -20.82 0.0046
2020-05-15 2020-03-31 13F TRANSOCEAN REG SHS H8817H100 14,575,492 11,471,457 16,908 1,298.8869
2020-02-14 2019-12-31 13F TRANSOCEAN REG SHS H8817H100 3,104,035 -2,177,174 -41.22 21,355 -9.54 0.0050
2019-11-14 2019-09-30 13F TRANSOCEAN REG SHS H8817H100 5,281,209 2,590,226 96.26 23,606 36.84 0.0062
2019-08-14 2019-06-30 13F TRANSOCEAN REG SHS H8817H100 2,690,983 752,984 38.85 17,251 2.20 0.0046
2019-05-15 2019-03-31 13F TRANSOCEAN REG SHS H8817H100 1,937,999 407,237 26.60 16,880 58.89 0.0048
2019-02-14 2018-12-31 13F TRANSOCEAN REG SHS H8817H100 1,530,762 66,063 4.51 10,624 -48.00 0.0032
2019-04-23 2018-09-30 13F/A-2 TRANSOCEAN REG SHS H8817H100 1,464,699 -332,958 -18.52 20,432 -15.43 0.0051
2018-11-20 2018-09-30 13F/A-1 TRANSOCEAN REG SHS H8817H100 1,464,699 0 20,432 0.0051
2018-11-14 2018-09-30 13F TRANSOCEAN REG SHS H8817H100 1,464,699 -332,958 20,432
2019-04-23 2018-06-30 13F/A-1 TRANSOCEAN REG SHS H8817H100 1,797,657 -420,248 -18.95 24,160 10.04 0.0065
2018-08-14 2018-06-30 13F TRANSOCEAN REG SHS H8817H100 1,797,657 -420,248 24,160
2019-04-23 2018-03-31 13F/A-1 TRANSOCEAN REG SHS H8817H100 2,217,905 409,036 22.61 21,956 13.66 0.0061
2018-05-14 2018-03-31 13F TRANSOCEAN REG SHS H8817H100 2,217,905 409,036 21,956
2019-04-23 2017-12-31 13F/A-1 TRANSOCEAN REG SHS H8817H100 1,808,869 -1,008,033 -35.79 19,318 -36.26 0.0053
2018-02-14 2017-12-31 13F TRANSOCEAN REG SHS H8817H100 1,808,869 -1,008,033 19,318
2017-11-14 2017-09-30 13F TRANSOCEAN REG SHS H8817H100 2,816,902 395,232 16.32 30,308 52.06 0.0091
2017-08-11 2017-06-30 13F TRANSOCEAN REG SHS H8817H100 2,421,670 -139,917 -5.46 19,931 -37.50 0.0060
2017-05-22 2017-03-31 13F/A-1 TRANSOCEAN REG SHS H8817H100 2,561,587 475,201 22.78 31,890 3.70 0.0098
2017-05-12 2017-03-31 13F TRANSOCEAN REG SHS H8817H100 2,561,587 31,890
2017-02-22 2016-12-31 13F/A-1 TRANSOCEAN REG SHS H8817H100 2,086,386 987,921 89.94 30,753 162.62 0.0101
2017-02-13 2016-12-31 13F TRANSOCEAN REG SHS H8817H100 2,086,386 30,753
2016-11-10 2016-09-30 13F TRANSOCEAN REG SHS H8817H100 1,098,465 -726,635 -39.81 11,710 -46.04 0.0040
2016-08-12 2016-06-30 13F TRANSOCEAN REG SHS H8817H100 1,825,100 -1,060,757 -36.76 21,700 -17.73 0.0078
2016-05-12 2016-03-31 13F TRANSOCEAN REG SHS H8817H100 2,885,857 -1,310,259 -31.23 26,377 -49.22 0.0102
2016-02-09 2015-12-31 13F TRANSOCEAN REG SHS H8817H100 4,196,116 -477,290 -10.21 51,948 -13.97 0.0188
2016-02-08 2015-09-30 13F/A-1 TRANSOCEAN REG SHS H8817H100 4,673,406 1,185,768 34.00 60,381 7.40 0.0223
2015-11-09 2015-09-30 13F TRANSOCEAN REG SHS H8817H100 4,673,406 60,381
2015-08-12 2015-06-30 13F TRANSOCEAN REG SHS H8817H100 3,487,638 1,090,457 45.49 56,222 59.87 0.0195
2015-05-14 2015-03-31 13F TRANSOCEAN REG SHS H8817H100 2,397,181 -700,878 -22.62 35,167 -38.07 0.0130
2015-02-13 2014-12-31 13F TRANSOCEAN REG SHS H8817H100 3,098,059 -1,153,091 -27.12 56,787 -58.22 0.0208
2014-12-16 2014-09-30 13F/A-1 TRANSOCEAN REG SHS H8817H100 4,251,150 1,059,865 33.21 135,910 -5.42 0.0523
2014-11-14 2014-09-30 13F TRANSOCEAN REG SHS H8817H100 4,251,150 135,910
2014-08-12 2014-06-30 13F TRANSOCEAN REG SHS H8817H100 3,191,285 21,750 0.69 143,704 9.67 0.2458
2014-05-13 2014-03-31 13F TRANSOCEAN REG SHS H8817H100 3,169,535 822,799 35.06 131,029 12.98 0.0549
2014-02-13 2013-12-31 13F TRANSOCEAN REG SHS H8817H100 2,346,736 250,470 11.95 115,976 24.33 0.0493
2013-11-13 2013-09-30 13F TRANSOCEAN COM H8817H100 2,096,266 -278,463 -11.73 93,283 -18.08 0.0441
2013-08-08 2013-06-30 13F TRANSOCEAN COM H8817H100 2,374,729 2,374,729 113,869 0.0574
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.