Transocean Ltd.
US ˙ NYSE ˙ CH0048265513

SecurityRIG / Transocean Ltd.
InstitutionNorthern Trust Corp
Latest Disclosed Ownership8,142,544 shares
Latest Disclosed Value $ 53,985,067
Northern Trust Corp reports 3.10% increase in ownership of RIG / Transocean Ltd.

On May 14, 2026 - Northern Trust Corp filed a 13F-HR form disclosing ownership of 8,142,544 shares of Transocean Ltd. (US:RIG) valued at $53,985,067 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 17, 2026 disclosing 7,897,577 shares of Transocean Ltd.. This represents a change in shares of 3.10% during the quarter. The current value of the position is $50,320,922 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)
2026-05-14 2026-03-31 13F TRANSOCEAN REGISTERED SHS H8817H100 8,142,544 244,967 3.10 53,985 65.52 0.0015
2026-02-17 2025-12-31 13F TRANSOCEAN REGISTERED SHS H8817H100 7,897,577 615 0.01 32,617 32.38 0.0009
2025-11-14 2025-09-30 13F TRANSOCEAN REGISTERED SHS H8817H100 7,896,962 994,301 14.40 24,639 37.82 0.0032
2025-08-13 2025-06-30 13F TRANSOCEAN REGISTERED SHS H8817H100 6,902,661 -153,510 -2.18 17,878 -20.08 0.0025
2025-05-13 2025-03-31 13F TRANSOCEAN REGISTERED SHS H8817H100 7,056,171 -414,530 -5.55 22,368 -20.16 0.0033
2025-02-14 2024-12-31 13F TRANSOCEAN REGISTERED SHS H8817H100 7,470,701 520,053 7.48 28,015 -5.16 0.0040
2024-11-13 2024-09-30 13F TRANSOCEAN COM H8817H100 6,950,648 4,391,662 171.62 29,540 115.78 0.0048
2024-08-14 2024-06-30 13F TRANSOCEAN COM H8817H100 2,558,986 325,588 14.58 13,691 -2.39 0.0023
2024-05-14 2024-03-31 13F TRANSOCEAN COM H8817H100 2,233,398 -65,703 -2.86 14,026 -3.93 0.0024
2024-02-13 2023-12-31 13F TRANSOCEAN COM H8817H100 2,299,101 71,514 3.21 14,599 -20.17 0.0026
2023-11-13 2023-09-30 13F TRANSOCEAN COM H8817H100 2,227,587 -15,623 -0.70 18,288 16.31 0.0035
2023-08-11 2023-06-30 13F TRANSOCEAN COM H8817H100 2,243,210 107,267 5.02 15,725 15.75 0.0030
2023-05-15 2023-03-31 13F TRANSOCEAN COM H8817H100 2,135,943 34,956 1.66 13,585 41.80 0.0027
2023-02-13 2022-12-31 13F TRANSOCEAN COM H8817H100 2,100,987 -1,188,259 -36.13 9,581 17.92 0.0020
2022-11-14 2022-09-30 13F TRANSOCEAN COM H8817H100 3,289,246 80,289 2.50 8,124 -23.97 0.0019
2022-08-12 2022-06-30 13F TRANSOCEAN COM H8817H100 3,208,957 -33,688 -1.04 10,685 -27.89 0.0023
2022-05-13 2022-03-31 13F TRANSOCEAN COM H8817H100 3,242,645 -163,191 -4.79 14,818 57.64 0.0026
2022-02-08 2021-12-31 13F TRANSOCEAN COM H8817H100 3,405,836 -152,898 -4.30 9,400 -30.31 0.0015
2021-11-15 2021-09-30 13F TRANSOCEAN COM H8817H100 3,558,734 6,988 0.20 13,488 -15.98 0.0024
2021-08-13 2021-06-30 13F TRANSOCEAN REG SHS H8817H100 3,551,746 -4,337,844 -54.98 16,054 -42.68 0.0028
2021-05-12 2021-03-31 13F TRANSOCEAN REG SHS H8817H100 7,889,590 831,842 11.79 28,007 71.79 0.0052
2021-02-11 2020-12-31 13F TRANSOCEAN REG SHS H8817H100 7,057,748 -363,024 -4.89 16,303 172.22 0.0032
2020-11-16 2020-09-30 13F TRANSOCEAN REG SHS H8817H100 7,420,772 2,299,670 44.91 5,989 -36.09 0.0013
2020-08-14 2020-06-30 13F TRANSOCEAN COM H8817H100 5,121,102 310,019 6.44 9,371 67.88 0.0022
2020-05-14 2020-03-31 13F TRANSOCEAN REG SHS H8817H100 4,811,083 -22,012 -0.46 5,582 -83.21 0.0016
2020-02-14 2019-12-31 13F TRANSOCEAN REG SHS H8817H100 4,833,095 282,746 6.21 33,252 63.49 0.0074
2019-11-13 2019-09-30 13F TRANSOCEAN COM H8817H100 4,550,349 354,796 8.46 20,339 -24.37 0.0049
2019-08-13 2019-06-30 13F TRANSOCEAN REG SHS H8817H100 4,195,553 -19,498 -0.46 26,893 -26.75 0.0064
2019-05-13 2019-03-31 13F TRANSOCEAN REG SHS H8817H100 4,215,051 84,349 2.04 36,712 28.06 0.0091
2019-02-12 2018-12-31 13F TRANSOCEAN REG SHS H8817H100 4,130,702 678,920 19.67 28,668 -40.46 0.0080
2018-11-14 2018-09-30 13F TRANSOCEAN REG SHS H8817H100 3,451,782 -75,224 -2.13 48,152 1.58 0.0118
2018-09-18 2018-06-30 13F/A-1 TRANSOCEAN REG SHS H8817H100 3,527,006 -44,063 -1.23 47,402 34.08 0.0120
2018-08-14 2018-06-30 13F TRANSOCEAN REG SHS H8817H100 3,556,665 -14,404 47,801
2018-05-09 2018-03-31 13F TRANSOCEAN REG SHS H8817H100 3,571,069 305,572 9.36 35,353 1.37 0.0092
2018-02-14 2017-12-31 13F TRANSOCEAN REG SHS H8817H100 3,265,497 -152,288 -4.46 34,875 -5.17 0.0088
2017-11-13 2017-09-30 13F TRANSOCEAN REG SHS H8817H100 3,417,785 -259,266 -7.05 36,775 21.52 0.0096
2017-08-11 2017-06-30 13F TRANSOCEAN COM H8817H100 3,677,051 -336,273 -8.38 30,262 -39.43 0.0085
2017-05-12 2017-03-31 13F TRANSOCEAN COM H8817H100 4,013,324 197,718 5.18 49,965 -11.16 0.0144
2017-02-13 2016-12-31 13F TRANSOCEAN COM H8817H100 3,815,606 385,308 11.23 56,242 53.81 0.0172
2016-11-09 2016-09-30 13F TRANSOCEAN COM H8817H100 3,430,298 -112,352 -3.17 36,567 -13.19 0.0114
2016-08-12 2016-06-30 13F TRANSOCEAN REG SHS H8817H100 3,542,650 754,533 27.06 42,123 63.78 0.0137
2016-08-19 2016-03-31 13F/A-1 TRANSOCEAN REG SHS H8817H100 2,788,117 -2,153 -0.08 25,719 -25.54 0.0085
2016-05-13 2016-03-31 13F Transocean Ltd Zug COMM H8817H100 2,788,097 25,483
2016-02-12 2015-12-31 13F Transocean Ltd Zug COMM H8817H100 2,790,270 -62,924 -2.21 34,543 -6.29 0.0115
2015-11-12 2015-09-30 13F Transocean Ltd Zug COMM H8817H100 2,853,194 2,853,194 0.00 36,863 0.0123
2015-08-13 2015-06-30 13F Transocean Ltd Zug COMM H8817H100 0 -2,561,372 -100.00 0 -100.00
2015-05-14 2015-03-31 13F Transocean Ltd Zug COMM H8817H100 2,561,372 -122,623 -4.57 37,576 -23.62 0.0113
2015-02-12 2014-12-31 13F Transocean Ltd Zug COM H8817H100 2,683,995 13,400 0.50 49,197 -42.38 0.0149
2014-11-13 2014-09-30 13F Transocean Ltd Zug COMM H8817H100 2,670,595 -285,293 -9.65 85,379 -35.85 0.0268
2014-08-14 2014-06-30 13F TRANSOCEAN com H8817H100 2,955,888 234,486 8.62 133,103 18.31 0.0415
2014-05-14 2014-03-31 13F TRANSOCEAN COMM H8817H100 2,721,402 75,769 2.86 112,503 -13.95 0.0354
2014-02-21 2013-12-31 13F/A-1 TRANSOCEAN COM H8817H100 2,645,633 1,368,458 107.15 130,747 130.05 0.0419
2014-02-12 2013-12-31 13F TRANSOCEAN COM H8817H100 2,645,633 130,747
2013-11-13 2013-09-30 13F TRANSOCEAN COM H8817H100 1,277,175 506,829 65.79 56,834 53.86 0.0200
2013-08-09 2013-06-30 13F TRANSOCEAN COM H8817H100 770,346 770,346 36,939 0.0134
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.