Transocean Ltd.
US ˙ NYSE ˙ CH0048265513

SecurityRIG / Transocean Ltd.
InstitutionSei Investments Co
Latest Disclosed Ownership284,360 shares
Latest Disclosed Value $ 1,174,408
Sei Investments Co reports 265.81% increase in ownership of RIG / Transocean Ltd.

On February 13, 2026 - Sei Investments Co filed a 13F-HR form disclosing ownership of 284,360 shares of Transocean Ltd. (US:RIG) valued at $1,174,407 USD as of December 31, 2025. The entity filed a previous 13F-HR on November 13, 2025 disclosing 77,734 shares of Transocean Ltd.. This represents a change in shares of 265.81% during the quarter. The current value of the position is $1,757,345 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)
2026-02-13 2025-12-31 13F TRANSOCEAN REGISTERED SHS H8817H100 284,360 206,626 265.81 1,174 385.12 0.0012
2025-11-13 2025-09-30 13F TRANSOCEAN REGISTERED SHS H8817H100 77,734 1,117 1.46 243 22.22 0.0003
2025-08-14 2025-06-30 13F TRANSOCEAN REGISTERED SHS H8817H100 76,617 28,975 60.82 198 31.13 0.0002
2025-05-14 2025-03-31 13F/A-1 TRANSOCEAN REGISTERED SHS H8817H100 47,642 -442 -0.92 151 -16.11 0.0002
2025-05-13 2025-03-31 13F TRANSOCEAN REGISTERED SHS H8817H100 48,084 0 180 0.0002
2025-02-11 2024-12-31 13F TRANSOCEAN REGISTERED SHS H8817H100 48,084 -404,714 -89.38 180 -90.64 0.0002
2024-11-12 2024-09-30 13F TRANSOCEAN REGISTERED SHS H8817H100 452,798 47,798 11.80 1,924 -11.17 0.0025
2024-08-13 2024-06-30 13F TRANSOCEAN REGISTERED SHS H8817H100 405,000 6,520 1.64 2,167 -13.43 0.0031
2024-05-07 2024-03-31 13F TRANSOCEAN REGISTERED SHS H8817H100 398,480 941 0.24 2,502 -0.87 0.0037
2024-02-14 2023-12-31 13F TRANSOCEAN REG SHS H8817H100 397,539 74,046 22.89 2,524 -4.93 0.0041
2023-11-14 2023-09-30 13F TRANSOCEAN REG SHS H8817H100 323,493 61,955 23.69 2,656 44.84 0.0048
2023-08-11 2023-06-30 13F TRANSOCEAN REG SHS H8817H100 261,538 0 0.00 1,833 10.22 0.0032
2023-05-12 2023-03-31 13F TRANSOCEAN REG SHS H8817H100 261,538 -4,908 -1.84 1,663 36.99 0.0031
2023-02-10 2022-12-31 13F TRANSOCEAN REG SHS H8817H100 266,446 -1,061 -0.40 1,215 83.66 0.0027
2022-11-14 2022-09-30 13F TRANSOCEAN REG SHS H8817H100 267,507 -7,913 -2.87 661 -27.92 0.0015
2022-08-15 2022-06-30 13F TRANSOCEAN REG SHS H8817H100 275,420 -29,115 -9.56 917 -34.12 0.0020
2022-05-13 2022-03-31 13F TRANSOCEAN REG SHS H8817H100 304,535 3,569 1.19 1,392 67.51 0.0028
2022-02-14 2021-12-31 13F TRANSOCEAN REG SHS H8817H100 300,966 9,760 3.35 831 -24.73 0.0016
2021-11-12 2021-09-30 13F TRANSOCEAN REG SHS H8817H100 291,206 0 0.00 1,104 -16.11 0.0023
2021-08-06 2021-06-30 13F TRANSOCEAN REG SHS H8817H100 291,206 -9,232 -3.07 1,316 23.34 0.0029
2021-05-12 2021-03-31 13F TRANSOCEAN REG SHS H8817H100 300,438 0 0.00 1,067 53.75 0.0027
2021-02-08 2020-12-31 13F TRANSOCEAN REG SHS H8817H100 300,438 0 0.00 694 186.78 0.0018
2020-12-04 2020-09-30 13F/A-1 TRANSOCEAN REG SHS H8817H100 300,438 0 0.00 242 -56.00 0.0007
2020-11-06 2020-09-30 13F TRANSOCEAN REG SHS H8817H100 300,438 0 242 582.6822
2020-08-17 2020-06-30 13F/A-1 TRANSOCEAN REG SHS H8817H100 300,438 -671 -0.22 550 57.14 0.0017
2020-08-11 2020-06-30 13F TRANSOCEAN REG SHS H8817H100 317,812 16,703 2,187 5,932.3539
2020-05-14 2020-03-31 13F TRANSOCEAN REG SHS H8817H100 301,109 -16,703 -5.26 350 -84.00 0.0013
2020-02-06 2019-12-31 13F TRANSOCEAN REG SHS H8817H100 317,812 263 0.08 2,187 54.12 0.0065
2019-11-12 2019-09-30 13F TRANSOCEAN REG SHS H8817H100 317,549 -13,687 -4.13 1,419 -33.16 0.0036
2019-08-14 2019-06-30 13F TRANSOCEAN REG SHS H8817H100 331,236 137,427 70.91 2,123 25.77 0.0069
2019-05-15 2019-03-31 13F TRANSOCEAN REG S3 H8817H100 193,809 -158,978 -45.06 1,688 -65.70 0.0057
2019-02-13 2018-12-31 13F TRANSOCEAN REG SHS H8817H100 352,787 23 0.01 4,921 0.00 0.0175
2018-11-08 2018-09-30 13F TRANSOCEAN REG SHS H8817H100 352,764 50,562 16.73 4,921 21.15 0.0178
2018-08-03 2018-06-30 13F TRANSOCEAN REG SHS H8817H100 302,202 141,644 88.22 4,062 155.47 0.0138
2018-05-11 2018-03-31 13F TRANSOCEAN REG SHS H8817H100 160,558 -78,842 -32.93 1,590 -37.82 0.0061
2018-02-08 2017-12-31 13F TRANSOCEAN REG SHS H8817H100 239,400 8,211 3.55 2,557 2.81 0.0089
2017-11-06 2017-09-30 13F TRANSOCEAN REG SHS H8817H100 231,189 23,908 11.53 2,487 45.87 0.0088
2017-07-31 2017-06-30 13F TRANSOCEAN REG SHS H8817H100 207,281 12,147 6.22 1,705 -29.84 0.0068
2017-05-05 2017-03-31 13F TRANSOCEAN REG SHS H8817H100 195,134 4,293 2.25 2,430 -13.62 0.0106
2017-02-02 2016-12-31 13F TRANSOCEAN REG SHS H8817H100 190,841 11,012 6.12 2,813 46.82 0.0136
2016-11-04 2016-09-30 13F TRANSOCEAN REG SHS H8817H100 179,829 100,740 127.38 1,916 103.61 0.0097
2016-08-11 2016-06-30 13F TRANSOCEAN REG SHS H8817H100 79,089 10,019 14.51 941 49.13 0.0056
2016-05-10 2016-03-31 13F/A-1 TRANSOCEAN REG SHS H8817H100 69,070 59,268 604.65 631 417.21 0.0039
2016-02-03 2015-12-31 13F TRANSOCEAN REG SHS H8817H100 9,802 1,474 17.70 122 12.96 0.0007
2015-11-02 2015-09-30 13F/A-1 TRANSOCEAN REG SHS H8817H100 8,328 7,754 1,350.87 108 1,100.00 0.0010
2015-10-30 2015-09-30 13F TRANSOCEAN REG SHS H8817H100 8,328 109
2015-08-07 2015-06-30 13F/A-1 TRANSOCEAN REG SHS H8817H100 574 164 40.00 9 50.00 0.0001
2015-08-04 2015-06-30 13F TRANSOCEAN REG SHS H8817H100 574 164 9 0.0001
2015-05-14 2015-03-31 13F/A-1 TRANSOCEAN REG SHS H8817H100 410 -406,520 -99.90 6 -99.92 0.0001
2015-05-01 2015-03-31 13F TRANSOCEAN REG SHS H8817H100 410 6
2015-02-10 2014-12-31 13F TRANSOCEAN REG SHS H8817H100 406,930 406,930 7,458 0.0659
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.