Transocean Ltd.
US ˙ NYSE ˙ CH0048265513

SecurityRIG / Transocean Ltd.
InstitutionAlliancebernstein L.p.
Latest Disclosed Ownership1,053,115 shares
Latest Disclosed Value $ 4,349,365
Alliancebernstein L.p. reports 14.89% increase in ownership of RIG / Transocean Ltd.

On May 15, 2026 - Alliancebernstein L.p. filed a 13F-HR form disclosing ownership of 1,053,115 shares of Transocean Ltd. (US:RIG) valued at $6,982,152 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 17, 2026 disclosing 916,615 shares of Transocean Ltd.. This represents a change in shares of 14.89% during the quarter. The current value of the position is $6,508,251 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 1,053,115 136,500 14.89 4,349 14.90 0.0012
2026-02-17 2025-12-31 13F TRANSOCEAN REGISTERED SHS H8817H100 916,615 149,386 19.47 3,786 58.17 0.0012
2025-11-14 2025-09-30 13F TRANSOCEAN REGISTERED SHS H8817H100 767,229 47 0.01 2,394 20.43 0.0008
2025-08-14 2025-06-30 13F TRANSOCEAN REGISTERED SHS H8817H100 767,182 0 0.00 1,987 -18.26 0.0006
2025-05-15 2025-03-31 13F TRANSOCEAN REGISTERED SHS H8817H100 767,182 -30 -0.00 2,432 -15.50 0.0009
2025-02-12 2024-12-31 13F TRANSOCEAN REGISTERED SHS H8817H100 767,212 -3,615 -0.47 2,877 -12.18 0.0010
2024-11-14 2024-09-30 13F TRANSOCEAN REGISTERED SHS H8817H100 770,827 -133,399 -14.75 3,276 -32.27 0.0011
2024-08-14 2024-06-30 13F TRANSOCEAN REGISTERED SHS H8817H100 904,226 872,398 2,740.98 4,838 2,330.65 0.0017
2024-05-14 2024-03-31 13F TRANSOCEAN REGISTERED SHS H8817H100 31,828 -61,950 -66.06 200 -66.55 0.0001
2024-02-14 2023-12-31 13F TRANSOCEAN REG SHS H8817H100 93,778 81,229 647.29 595 477.67 0.0002
2023-11-14 2023-09-30 13F TRANSOCEAN REG SHS H8817H100 12,549 -7,967 -38.83 103 -27.97 0.0000
2023-08-15 2023-06-30 13F TRANSOCEAN REG SHS H8817H100 20,516 4,700 29.72 144 43.00 0.0001
2023-05-15 2023-03-31 13F TRANSOCEAN REG SHS H8817H100 15,816 0 0.00 101 38.89 0.0000
2023-02-15 2022-12-31 13F TRANSOCEAN REG SHS H8817H100 15,816 0 0.00 72 84.62 0.0000
2022-11-15 2022-09-30 13F TRANSOCEAN REG SHS H8817H100 15,816 0 0.00 39 -26.42 0.0000
2022-08-15 2022-06-30 13F TRANSOCEAN REG SHS H8817H100 15,816 0 0.00 53 -26.39 0.0000
2022-05-13 2022-03-31 13F TRANSOCEAN REG SHS H8817H100 15,816 -983 -5.85 72 56.52 0.0000
2022-02-14 2021-12-31 13F TRANSOCEAN REG SHS H8817H100 16,799 16,799 46 0.0000
2021-11-10 2021-09-30 13F TRANSOCEAN REG SHS H8817H100 0 -20,599 -100.00 0 -100.00
2021-07-30 2021-06-30 13F TRANSOCEAN REG SHS H8817H100 20,599 -834,388 -97.59 93 -96.94 0.0000
2021-05-06 2021-03-31 13F TRANSOCEAN REG SHS H8817H100 854,987 11,593 1.37 3,035 55.80 0.0013
2021-02-08 2020-12-31 13F TRANSOCEAN REG SHS H8817H100 843,394 -9,300 -1.09 1,948 183.14 0.0009
2020-11-12 2020-09-30 13F TRANSOCEAN REG SHS H8817H100 852,694 -627,329 -42.39 688 -74.59 0.0004
2020-08-13 2020-06-30 13F TRANSOCEAN REG SHS H8817H100 1,480,023 477,910 47.69 2,708 133.05 0.0016
2020-05-14 2020-03-31 13F TRANSOCEAN REG SHS H8817H100 1,002,113 56,740 6.00 1,162 -82.13 0.0008
2020-02-18 2019-12-31 13F TRANSOCEAN REG SHS H8817H100 945,373 29,830 3.26 6,504 58.94 0.0037
2019-11-14 2019-09-30 13F TRANSOCEAN REG SHS H8817H100 915,543 63,380 7.44 4,092 -25.08 0.0025
2019-08-14 2019-06-30 13F TRANSOCEAN REG SHS H8817H100 852,163 10,310 1.22 5,462 -25.51 0.0034
2019-05-14 2019-03-31 13F TRANSOCEAN REG SHS H8817H100 841,853 410 0.05 7,333 25.57 0.0048
2019-02-13 2018-12-31 13F TRANSOCEAN REG SHS H8817H100 841,443 620,560 280.95 5,840 89.55 0.0043
2018-11-08 2018-09-30 13F TRANSOCEAN REG SHS H8817H100 220,883 -3,891 -1.73 3,081 1.99 0.0020
2018-08-13 2018-06-30 13F TRANSOCEAN REG SHS H8817H100 224,774 -17,966 -7.40 3,021 25.72 0.0021
2018-05-14 2018-03-31 13F TRANSOCEAN REG SHS H8817H100 242,740 10,417 4.48 2,403 -3.14 0.0017
2018-02-13 2017-12-31 13F TRANSOCEAN REG SHS H8817H100 232,323 -5,690 -2.39 2,481 -3.12 0.0018
2017-11-13 2017-09-30 13F TRANSOCEAN REG SHS H8817H100 238,013 -369,536 -60.82 2,561 -48.78 0.0019
2017-08-10 2017-06-30 13F TRANSOCEAN REG SHS H8817H100 607,549 8,207 1.37 5,000 -32.99 0.0039
2017-05-11 2017-03-31 13F TRANSOCEAN REG SHS H8817H100 599,342 -11,853 -1.94 7,462 -17.17 0.0059
2017-02-13 2016-12-31 13F TRANSOCEAN REG SHS H8817H100 611,195 11,593 1.93 9,009 40.94 0.0075
2016-11-10 2016-09-30 13F TRANSOCEAN REG SHS H8817H100 599,602 -1,268 -0.21 6,392 -10.53 0.0054
2016-08-11 2016-06-30 13F TRANSOCEAN REG SHS H8817H100 600,870 184,810 44.42 7,144 87.85 0.0062
2016-05-13 2016-03-31 13F TRANSOCEAN REG SHS H8817H100 416,060 -132,438 -24.15 3,803 -43.99 0.0032
2016-02-16 2015-12-31 13F/A-1 TRANSOCEAN REG SHS H8817H100 548,498 71,635 15.02 6,790 10.21 0.0058
2016-02-12 2015-12-31 13F TRANSOCEAN REG SHS H8817H100 548,498 7,087
2015-11-13 2015-09-30 13F TRANSOCEAN REG SHS H8817H100 476,863 -17,981 -3.63 6,161 -22.77 0.0053
2015-08-14 2015-06-30 13F TRANSOCEAN REG SHS H8817H100 494,844 10,722 2.21 7,977 12.72 0.0066
2015-05-13 2015-03-31 13F TRANSOCEAN REG SHS H8817H100 484,122 -1,169 -0.24 7,077 -20.61 0.0057
2015-02-13 2014-12-31 13F TRANSOCEAN REG SHS H8817H100 485,291 -6,100 -1.24 8,914 -43.41 0.0074
2014-11-13 2014-09-30 13F TRANSOCEAN REG SHS H8817H100 491,391 3,311 0.68 15,753 -28.32 0.0133
2014-08-13 2014-06-30 13F TRANSOCEAN REG SHS H8817H100 488,080 -237,416 -32.72 21,978 -26.69 0.0185
2014-05-13 2014-03-31 13F TRANSOCEAN REG SHS H8817H100 725,496 634 0.09 29,978 -16.32 0.0259
2014-02-13 2013-12-31 13F TRANSOCEAN REG SHS H8817H100 724,862 337,328 87.04 35,823 107.73 0.0320
2013-11-14 2013-09-30 13F TRANSOCEAN REG SHS H8817H100 387,534 -47,468 -10.91 17,245 -17.32 0.0170
2013-08-13 2013-06-30 13F TRANSOCEAN REG SHS H8817H100 435,002 435,002 20,858 0.0221
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.