Transocean Ltd.
US ˙ NYSE ˙ CH0048265513

SecurityRIG / Transocean Ltd.
InstitutionNomura Holdings Inc
Latest Disclosed Ownership876,168 shares
Latest Disclosed Value $ 5,808,994
Nomura Holdings Inc ownership in RIG / Transocean Ltd.

On May 15, 2026 - Nomura Holdings Inc filed a 13F-HR form disclosing ownership of 876,168 shares of Transocean Ltd. (US:RIG) valued at $5,808,994 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 17, 2026 disclosing 30,881 shares of Transocean Ltd.. This represents a change in shares of 2,737.24% during the quarter. The current value of the position is $5,213,200 USD.

Nomura Holdings Inc has a history of taking positions in derivatives of the underlying security (RIG) in the form of stock options. The firm currently holds call options representing 0 of underlying shares valued at $0 USD and put options representing 0 of underlying shares valued at $0 USD .

Note: prior versions of this page mistakenly stated that the share values represented the number of options, not the number of underlying shares. For more information on the data backing these reports, please see the SEC document Frequently Asked Questions About Form 13F.

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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Institutional Put/Call Ratios
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In addition to reporting standard equity and debt issues, institutions with more than 100MM assets under management must also disclose their put and call option holdings. Since put options generally indicate negative sentiment, and call options indicate positive sentiment, we can get a sense of the overall institutional sentiment by plotting the ratio of puts to calls. The chart to the right plots the historical put/call ratio for this instrument.

Using Put/Call Ratio as an indicator of investor sentiment overcomes one of the key deficiencies of using total institutional ownership, which is that a significant amount of assets under management are invested passively to track indices. Passively-managed funds do not typically buy options, so the put/call ratio indicator more closely tracks the sentiment of actively-managed funds.

RIG / Transocean Ltd. Historical Put/Call Ratio
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 876,168 845,287 2,737.24 5,809 4,473.23 0.0118
2026-02-17 2025-12-31 13F TRANSOCEAN REGISTERED SHS H8817H100 30,881 30,881 128 0.0002
2025-08-18 2025-06-30 13F/A-1 TRANSOCEAN REGISTERED SHS H8817H100 0 -143,832 -100.00 0 -100.00
2025-08-14 2025-06-30 13F TRANSOCEAN REGISTERED SHS H8817H100 0 0
2025-05-15 2025-03-31 13F TRANSOCEAN REGISTERED SHS H8817H100 143,832 111,181 340.51 456 272.95 0.0009
2025-02-14 2024-12-31 13F TRANSOCEAN REGISTERED SHS H8817H100 32,651 3,390 11.59 122 -1.61 0.0002
2025-01-13 2024-09-30 13F/A-1 TRANSOCEAN REGISTERED SHS H8817H100 29,261 29,261 124 0.0003
2024-11-14 2024-09-30 13F TRANSOCEAN REGISTERED SHS H8817H100 29,261 29,261 124 0.0002
2024-05-15 2024-03-31 13F TRANSOCEAN REG SHS H8817H100 0 -658,910 -100.00 0 -100.00
2024-03-27 2023-12-31 13F/A-1 TRANSOCEAN REG SHS H8817H100 658,910 218,801 49.72 4,184 15.80 0.0113
2024-02-14 2023-12-31 13F TRANSOCEAN REG SHS H8817H100 658,910 218,801 4,184 0.0086
2023-11-14 2023-09-30 13F TRANSOCEAN REG SHS H8817H100 440,109 -69,448 -13.63 3,613 1.18 0.0103
2023-08-14 2023-06-30 13F TRANSOCEAN REG SHS H8817H100 509,557 491,555 2,730.56 3,572 3,032.46 0.0097
2023-05-15 2023-03-31 13F TRANSOCEAN REG SHS H8817H100 18,002 -10,783 -37.46 114 0.0004
2023-02-15 2022-12-31 13F/A-1 TRANSOCEAN CMN H8817H100 28,785 28,785 0 0.0005
2023-02-14 2022-12-31 13F TRANSOCEAN CMN H8817H100 28,785 28,785 0 0.0006
2022-02-14 2021-12-31 13F TRANSOCEAN CMN H8817H100 0 -106,716 -100.00 0 -100.00
2021-11-15 2021-09-30 13F TRANSOCEAN CMN H8817H100 106,716 0 0.00 409 -14.97 0.0010
2021-08-16 2021-06-30 13F TRANSOCEAN CMN H8817H100 106,716 -103 -0.10 481 0.0012
2021-05-17 2021-03-31 13F TRANSOCEAN CMN H8817H100 106,819 -292,797 -73.27 0 -100.00 0.0009
2021-02-16 2020-12-31 13F TRANSOCEAN CMN H8817H100 399,616 192,361 92.81 1 -99.68 0.0019
2020-11-12 2020-09-30 13F TRANSOCEAN CMN H8817H100 207,255 64,417 45.10 308 -12.00 0.0007
2020-08-14 2020-06-30 13F TRANSOCEAN CMN H8817H100 142,838 142,838 350 0.0012
2020-05-15 2020-03-31 13F/A-1 TRANSOCEAN CMN H8817H100 0 -808,105 -100.00 0 -100.00
2020-02-14 2019-12-31 13F TRANSOCEAN CMN H8817H100 808,105 -150,792 -15.73 5,474 26.83 0.0203
2019-11-14 2019-09-30 13F TRANSOCEAN CMN H8817H100 958,897 -1,396,402 -59.29 4,316 -71.63 0.0164
2019-08-23 2019-06-30 13F/A-1 TRANSOCEAN CMN H8817H100 2,355,299 676,062 40.26 15,213 -1.27 0.0673
2019-08-14 2019-06-30 13F TRANSOCEAN CMN H8817H100 2,355,299 676,062 15,213
2019-05-14 2019-03-31 13F TRANSOCEAN CMN H8817H100 1,679,237 -73,999 -4.22 15,409 27.67 0.0651
2019-02-14 2018-12-31 13F TRANSOCEAN CMN H8817H100 1,753,236 -84,780 -4.61 12,069 -53.38 0.0449
2018-11-14 2018-09-30 13F TRANSOCEAN CMN H8817H100 1,838,016 1,616,325 729.09 25,888 768.72 0.0908
2018-08-17 2018-06-30 13F/A-1 TRANSOCEAN CMN H8817H100 221,691 -7,743 -3.37 2,980 31.51 0.0095
2018-08-14 2018-06-30 13F TRANSOCEAN CMN H8817H100 221,691 -7,743 2,658
2018-05-14 2018-03-31 13F/A-1 TRANSOCEAN CMN H8817H100 229,434 -200,112 -46.59 2,266 -50.65 0.0039
2018-05-14 2018-03-31 13F TRANSOCEAN CMN H8817H100 658,980 6,858
2018-02-14 2017-12-31 13F TRANSOCEAN CMN H8817H100 429,546 83,270 24.05 4,592 23.77 0.0082
2017-11-14 2017-09-30 13F TRANSOCEAN CMN H8817H100 346,276 70,215 25.43 3,710 61.44 0.0078
2017-08-15 2017-06-30 13F TRANSOCEAN CMN H8817H100 276,061 32,111 13.16 2,298 -24.26 0.0056
2017-05-18 2017-03-31 13F/A-1 TRANSOCEAN CMN H8817H100 243,950 91,682 60.21 3,034 34.78 0.0079
2017-05-15 2017-03-31 13F TRANSOCEAN CMN H8817H100 243,950 91,682 3,034
2017-02-13 2016-12-31 13F TRANSOCEAN CMN H8817H100 152,268 -176,998 -53.76 2,251 -35.89 0.0057
2016-11-14 2016-09-30 13F TRANSOCEAN CMN H8817H100 329,266 136,257 70.60 3,511 53.59 0.0098
2016-09-02 2016-06-30 13F/A-1 TRANSOCEAN CMN H8817H100 193,009 155,397 413.16 2,286 570.38 0.0075
2016-08-15 2016-06-30 13F TRANSOCEAN CMN H8817H100 193,009 2,286
2016-05-16 2016-03-31 13F TRANSOCEAN CMN H8817H100 37,612 -821,512 -95.62 341 -96.79 0.0012
2016-02-12 2015-12-31 13F TRANSOCEAN CMN H8817H100 859,124 249,260 40.87 10,623 13.75 0.0297
2015-11-16 2015-09-30 13F TRANSOCEAN CMN H8817H100 609,864 418,988 219.51 9,339 168.67 0.0335
2015-08-14 2015-06-30 13F TRANSOCEAN CMN H8817H100 190,876 176,236 1,203.80 3,476 1,307.29 0.0098
2015-05-15 2015-03-31 13F TRANSOCEAN CMN H8817H100 14,640 -281,574 -95.06 247 -95.88 0.0008
2015-02-17 2014-12-31 13F TRANSOCEAN CMN H8817H100 296,214 125,345 73.36 5,997 6.88 0.0160
2014-11-14 2014-09-30 13F TRANSOCEAN CMN H8817H100 170,869 118,785 228.06 5,611 140.61 0.0152
2014-08-13 2014-06-30 13F TRANSOCEAN CMN H8817H100 52,084 -55,050 -51.38 2,332 -47.30 0.0007
2014-05-14 2014-03-31 13F TRANSOCEAN CMN H8817H100 107,134 75,854 242.50 4,425 186.59 0.0014
2014-02-14 2013-12-31 13F TRANSOCEAN CMN H8817H100 31,280 -195,671 -86.22 1,544 -84.77 0.0071
2013-11-14 2013-09-30 13F TRANSOCEAN CMN H8817H100 226,951 93,850 70.51 10,135 58.63 0.0610
2013-08-15 2013-06-30 13F TRANSOCEAN CMN H8817H100 133,101 119,979 914.33 6,389 838.18 0.0519
2013-08-16 2013-03-31 13F/A-2 TRANSOCEAN CMN H8817H100 13,122 -13,304 -50.34 681 -42.09 0.0072
2013-08-16 2012-12-31 13F/A-1 TRANSOCEAN CMN H8817H100 26,426 26,426 1,176 0.0131
Disclosed Call Options
File
Date
Effective
Date
Form Security Class ID Opt Avg Share
Price
Shares ΔShares
(%)
Value
(x1000)
ΔValue
(%)
Prior Allocation
(%)
Allocation
(%)
ΔAllocation
(%)
Cost Basis
(x1000)
Profit
(x1000)
Return
(%)
2024-08-14 2024-06-30 13F TRANSOCEAN REGISTERED SHS Call 0 -100.00 0 -100.00 n/a n/a n/a
2024-05-15 2024-03-31 13F TRANSOCEAN REGISTERED SHS Call 469,000 -26.32 2,945 -27.12 n/a n/a n/a
2024-03-27 2023-12-31 13F/A TRANSOCEAN REG SHS Call 636,500 280.00 4,042 193.89 n/a n/a n/a
2024-02-14 2023-12-31 13F TRANSOCEAN REG SHS Call 636,500 4,042 n/a n/a n/a
2023-11-14 2023-09-30 13F TRANSOCEAN REG SHS Call 167,500 -63.59 1,375 -57.35 n/a n/a n/a
2023-08-14 2023-06-30 13F TRANSOCEAN REG SHS Call 460,000 95.74 3,225 115.80 n/a n/a n/a
2023-05-15 2023-03-31 13F TRANSOCEAN REG SHS Call 235,000 38.24 1,495 n/a n/a n/a
2023-02-15 2022-12-31 13F/A TRANSOCEAN CMN Call 170,000 1 n/a n/a n/a
2023-02-14 2022-12-31 13F TRANSOCEAN CMN Call 170,000 1 n/a n/a n/a
2021-05-17 2021-03-31 13F TRANSOCEAN CMN Call 0 -100.00 0 -100.00 n/a n/a n/a
2021-02-16 2020-12-31 13F TRANSOCEAN CMN Call 6,468,600 -31.86 18 -99.88 n/a n/a n/a
2020-11-12 2020-09-30 13F TRANSOCEAN CMN Call 9,493,100 14,094 n/a n/a n/a
2020-08-14 2020-06-30 13F TRANSOCEAN CMN Call 0 -100.00 0 -100.00 n/a n/a n/a
2020-05-15 2020-03-31 13F/A TRANSOCEAN CMN Call 1,000,000 1,795 n/a n/a n/a
2020-05-14 2020-03-31 13F TRANSOCEAN CMN Call 1,000,000 1,795 n/a n/a n/a
2019-05-14 2019-03-31 13F TRANSOCEAN CMN Call 0 -100.00 0 n/a n/a n/a
2019-02-14 2018-12-31 13F TRANSOCEAN CMN Call 1,554,600 100.44 0 n/a n/a n/a
2018-11-14 2018-09-30 13F TRANSOCEAN CMN Call 775,600 5.14 0 n/a n/a n/a
2018-08-17 2018-06-30 13F/A TRANSOCEAN CMN Call 737,700 -87.01 0 n/a n/a n/a
2018-08-14 2018-06-30 13F TRANSOCEAN CMN Call 737,700 0 n/a n/a n/a
2018-05-14 2018-03-31 13F/A TRANSOCEAN CMN Call 5,680,000 3,686.67 0 -100.00 n/a n/a n/a
2018-05-14 2018-03-31 13F TRANSOCEAN CMN Call 5,830,000 1,604 n/a n/a n/a
2018-02-14 2017-12-31 13F TRANSOCEAN CMN Call 150,000 0.00 1,604 -0.19 n/a n/a n/a
2017-11-14 2017-09-30 13F TRANSOCEAN CMN Call 150,000 -76.92 1,607 -70.30 n/a n/a n/a
2017-08-15 2017-06-30 13F TRANSOCEAN CMN Call 650,000 5,410 n/a n/a n/a
2016-05-16 2016-03-31 13F TRANSOCEAN CMN Call 0 -100.00 0 -100.00 n/a n/a n/a
2016-02-12 2015-12-31 13F TRANSOCEAN CMN Call 280,000 -22.93 3,462 -37.78 n/a n/a n/a
2015-11-16 2015-09-30 13F TRANSOCEAN CMN Call 363,300 29.75 5,564 9.12 n/a n/a n/a
2015-08-14 2015-06-30 13F TRANSOCEAN CMN Call 280,000 -3.15 5,099 4.57 n/a n/a n/a
2015-05-15 2015-03-31 13F TRANSOCEAN CMN Call 289,100 -32.06 4,876 -43.40 n/a n/a n/a
2015-02-17 2014-12-31 13F TRANSOCEAN CMN Call 425,500 -60.89 8,615 -75.88 n/a n/a n/a
2014-11-14 2014-09-30 13F TRANSOCEAN CMN Call 1,087,900 268.41 35,721 170.22 n/a n/a n/a
2014-08-13 2014-06-30 13F TRANSOCEAN CMN Call 295,300 1,700.61 13,219 1,852.58 n/a n/a n/a
2014-05-14 2014-03-31 13F TRANSOCEAN CMN Call 16,400 677 n/a n/a n/a
Disclosed Put Options
File
Date
Effective
Date
Form Security Class ID Opt Avg Share Price Shares ΔShares
(%)
Value
(x1000)
ΔValue
(%)
Prior Allocation
(%)
Allocation
(%)
ΔAllocation
(%)
Cost Basis
(x1000)
Profit
(x1000)
Return
(%)
2025-08-18 2025-06-30 13F/A TRANSOCEAN REGISTERED SHS Put 0 -100.00 0 -100.00 n/a n/a n/a
2025-08-14 2025-06-30 13F TRANSOCEAN REGISTERED SHS Put 0 0 n/a n/a n/a
2025-05-15 2025-03-31 13F TRANSOCEAN REGISTERED SHS Put 756,000 2,397 n/a n/a n/a
2024-05-15 2024-03-31 13F TRANSOCEAN REG SHS Put 0 -100.00 0 -100.00 n/a n/a n/a
2024-03-27 2023-12-31 13F/A TRANSOCEAN REG SHS Put 600,000 0.00 3,810 -22.66 n/a n/a n/a
2024-02-14 2023-12-31 13F TRANSOCEAN REG SHS Put 600,000 3,810 n/a n/a n/a
2023-11-14 2023-09-30 13F TRANSOCEAN REG SHS Put 600,000 0.00 4,926 17.12 n/a n/a n/a
2023-08-14 2023-06-30 13F TRANSOCEAN REG SHS Put 600,000 4,206 n/a n/a n/a
2023-05-15 2023-03-31 13F TRANSOCEAN CMN Put 0 -100.00 0 n/a n/a n/a
2023-02-15 2022-12-31 13F/A TRANSOCEAN CMN Put 187,000 0.00 1 -100.00 n/a n/a n/a
2023-02-14 2022-12-31 13F TRANSOCEAN CMN Put 187,000 1 n/a n/a n/a
2022-11-15 2022-09-30 13F TRANSOCEAN CMN Put 187,000 463 n/a n/a n/a
2022-08-17 2022-06-30 13F/A TRANSOCEAN CMN Put 0 -100.00 0 -100.00 n/a n/a n/a
2022-08-15 2022-06-30 13F TRANSOCEAN CMN Put 0 0 n/a n/a n/a
2022-05-18 2022-03-31 13F TRANSOCEAN CMN Put 187,000 0.00 867 68.02 n/a n/a n/a
2022-02-14 2021-12-31 13F TRANSOCEAN CMN Put 187,000 516 n/a n/a n/a
2021-05-17 2021-03-31 13F TRANSOCEAN CMN Put 0 -100.00 0 -100.00 n/a n/a n/a
2021-02-16 2020-12-31 13F TRANSOCEAN CMN Put 613,400 0.00 2 -99.89 n/a n/a n/a
2020-11-12 2020-09-30 13F TRANSOCEAN CMN Put 613,400 60.66 911 -2.57 n/a n/a n/a
2020-08-14 2020-06-30 13F TRANSOCEAN CMN Put 381,800 0.00 935 36.50 n/a n/a n/a
2020-05-15 2020-03-31 13F/A TRANSOCEAN CMN Put 381,800 -3.61 685 -74.47 n/a n/a n/a
2020-05-14 2020-03-31 13F TRANSOCEAN CMN Put 381,800 685 n/a n/a n/a
2020-02-14 2019-12-31 13F TRANSOCEAN CMN Put 396,100 3.75 2,683 56.08 n/a n/a n/a
2019-11-14 2019-09-30 13F TRANSOCEAN CMN Put 381,800 1,719 n/a n/a n/a
2018-08-17 2018-06-30 13F/A TRANSOCEAN CMN Put 0 -100.00 0 -100.00 n/a n/a n/a
2018-05-14 2018-03-31 13F TRANSOCEAN CMN Put 200,000 0.00 2,138 0.00 n/a n/a n/a
2018-02-14 2017-12-31 13F TRANSOCEAN CMN Put 200,000 0.00 2,138 -0.23 n/a n/a n/a
2017-11-14 2017-09-30 13F TRANSOCEAN CMN Put 200,000 -88.35 2,143 -85.00 n/a n/a n/a
2017-08-15 2017-06-30 13F TRANSOCEAN CMN Put 1,716,900 535.89 14,289 325.52 n/a n/a n/a
2017-05-18 2017-03-31 13F/A TRANSOCEAN CMN Put 270,000 22.73 3,358 3.23 n/a n/a n/a
2017-05-15 2017-03-31 13F TRANSOCEAN CMN Put 270,000 3,358 n/a n/a n/a
2017-02-13 2016-12-31 13F TRANSOCEAN CMN Put 220,000 3,253 n/a n/a n/a
2016-05-16 2016-03-31 13F TRANSOCEAN CMN Put 0 -100.00 0 -100.00 n/a n/a n/a
2016-02-12 2015-12-31 13F TRANSOCEAN CMN Put 100,000 -81.38 1,237 -84.96 n/a n/a n/a
2015-11-16 2015-09-30 13F TRANSOCEAN CMN Put 537,100 53.46 8,225 29.06 n/a n/a n/a
2015-08-14 2015-06-30 13F TRANSOCEAN CMN Put 350,000 34.41 6,373 45.10 n/a n/a n/a
2015-05-15 2015-03-31 13F TRANSOCEAN CMN Put 260,400 -29.64 4,392 -41.39 n/a n/a n/a
2015-02-17 2014-12-31 13F TRANSOCEAN CMN Put 370,100 1,203.17 7,493 703.11 n/a n/a n/a
2014-11-14 2014-09-30 13F TRANSOCEAN CMN Put 28,400 2,266.67 933 1,766.00 n/a n/a n/a
2014-05-14 2014-03-31 13F TRANSOCEAN CMN Put 1,200 50 n/a n/a n/a
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.