Company · Ownership research

Transocean Ltd. RIG

CIK 0001451505 · CUSIP H8817H100

Insider trading Initial holdings Institutional holders

Quarter-end disclosures, not live holdings.

Several CUSIPs are reported for this company; this page shows CUSIP H8817H100 (RIG), not CUSIP H8817H900 (RIG), CUSIP H8817H950 (RIG), and does not merge CUSIPs.

This page lists the top 20 of 542 rows by value; the complete set is available through the API.

Some filings reported values in thousands; those figures were scaled ×1,000 to dollars.

Top 20 institutions

Weight means this stock's share of the manager's own portfolio.

By reported value

#	Manager	Value	Manager weight	Change vs prior	Source
01	BlackRock, Inc. CIK 2012383 · View history	$585.90M 88,371,248 shares	0.01%	+228.29K(+0.30%)Added	SEC filing ↗ May 13, 2026	▾
02	DIMENSIONAL FUND ADVISORS LP CIK 354204 · View history	$323.68M 48,819,576 shares	0.07%	+5.35M(+12.30%)Added	SEC filing ↗ May 7, 2026	▾
03	VANGUARD PORTFOLIO MANAGEMENT LLC CIK 2100121 · Amended · View history	$310.70M 46,862,730 shares	0.02%	—	SEC filing ↗ May 8, 2026	▾
04	TWO SIGMA INVESTMENTS, LP CIK 1179392 · View history	$308.05M 46,463,736 shares	0.26%	+22.23M(+91.70%)Added	SEC filing ↗ May 15, 2026	▾
05	VANGUARD CAPITAL MANAGEMENT LLC CIK 2100119 · Amended · View history	$293.53M 44,272,423 shares	0.01%	—	SEC filing ↗ May 15, 2026	▾
06	D. E. Shaw & Co., Inc. CIK 1009207 · View history	$260.31M 39,262,599 shares	0.21%	+22.84M(+139.00%)Added	SEC filing ↗ May 15, 2026	▾
07	Slate Path Capital LP CIK 1559706 · View history	$199.31M 30,062,100 shares	2.96%	+30.06MNew	SEC filing ↗ May 15, 2026	▾
08	Capital World Investors CIK 1422849 · View history	$196.09M 29,575,479 shares	0.03%	+13.91M(+88.80%)Added	SEC filing ↗ May 13, 2026	▾
09	STATE STREET CORP CIK 93751 · View history	$165.63M 24,982,204 shares	0.01%	+256.31K(+1.00%)Added	SEC filing ↗ May 15, 2026	▾
10	PILGRIM GLOBAL ADVISORS LLC CIK 1963918 · View history	$158.54M 23,913,120 shares	20.53%	-7.85M(-24.70%)Reduced	SEC filing ↗ May 15, 2026	▾
11	GEODE CAPITAL MANAGEMENT, LLC CIK 1214717 · View history	$155.65M 23,471,597 shares	0.01%	+674.42K(+3.00%)Added	SEC filing ↗ May 15, 2026	▾
12	AMERICAN CENTURY COMPANIES INC CIK 748054 · View history	$150.89M 22,759,181 shares	0.08%	-4.73M(-17.20%)Reduced	SEC filing ↗ May 15, 2026	▾
13	MORGAN STANLEY CIK 895421 · View history	$143.83M 21,693,064 shares	0.01%	-3.10M(-12.50%)Reduced	SEC filing ↗ May 15, 2026	▾
14	VAN ECK ASSOCIATES CORP CIK 869178 · View history	$140.14M 21,137,129 shares	0.11%	+4.31M(+25.60%)Added	SEC filing ↗ May 15, 2026	▾
15	Dalal Street, LLC CIK 1549575 · View history	$135.20M 20,392,672 shares	31.97%	-6.65M(-24.60%)Reduced	SEC filing ↗ May 14, 2026	▾
16	VOLORIDGE INVESTMENT MANAGEMENT, LLC CIK 1556921 · View history	$109.68M 16,542,717 shares	0.44%	+16.54MNew	SEC filing ↗ May 15, 2026	▾
17	MARSHALL WACE, LLP CIK 1318757 · View history	$106.37M 16,043,764 shares	0.11%	+16.01M(+42,120.40%)Added	SEC filing ↗ May 15, 2026	▾
18	Elliott Investment Management L.P. CIK 1791786 · View history	$103.61M 15,626,834 shares	0.65%	+15.63MNew	SEC filing ↗ May 15, 2026	▾
19	GOLDMAN SACHS GROUP INC CIK 886982 · View history	$85.54M 12,901,382 shares	0.01%	-3.14M(-19.60%)Reduced	SEC filing ↗ May 15, 2026	▾
20	KEYBANK NATIONAL ASSOCIATION/OH CIK 1089877 · View history	$83.92M 12,656,881 shares	0.31%	+405.80K(+3.30%)Added	SEC filing ↗ Apr 24, 2026	▾

Showing 20 / 542 institutions. The complete set is available through the API.

Coverage & totals by quarter

Reporting institutions

542

Cancelled or null records excluded

Disclosed shares

907,390,254

Not deduplicated across managers

Disclosed value

$6.01B

Not market cap or free float

Reporting institutions by quarter

Counts also change with data coverage and reporting entities; they do not measure net buying. Distinct managers with a live stock row in this CUSIP; totals may include overlapping filings and are not a share of the company.

Transocean Ltd. · Q1 2026

Explore all 542 reporting institutions.

This page includes 20 of 542 reporting institutions. Log in to look up the full history beyond 3 years, use advanced screening & filtering, download CSV, and get the complete set through the Akkru API.

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Sources, coverage & how to read this data

Figures are as reported to the SEC and merged with later amendments where Akkru could match them. Preview limits apply to what is listed, not to the totals, which come from the complete reported data. Nothing is zero-filled: a missing quarter or month is shown as missing.