Exhibit 21.
List of Tidewater Inc. Subsidiaries as of December 31, 2025
|
Name of Subsidiary or Organization |
Jurisdiction of Incorporation |
Percentage of Voting Securities Owned |
|
|
1 |
3291361 Nova Scotia ULC |
Canada |
100% |
|
2 |
Al Wasl Marine LLC |
Dubai |
49% |
|
3 |
Anscor Tidewater Ship Management Corporation |
Philippines |
24.99% |
|
4 |
Arabia Shipping Limited |
Cayman Islands |
100% |
|
5 |
Arrendadora de Naves del Golfo, S.A. de C.V., SOFOM, ENR |
Mexico |
100% |
|
6 |
Divetide Limited |
Thailand |
49% |
|
7 |
Dromond Shipping Pte. Ltd. |
Singapore |
100% |
|
8 |
DTDW Holdings Limited |
Cyprus |
40% |
|
9 |
DTDW Marine Services B.V. |
Netherlands |
40% |
|
10 |
Equipo Mara, C.A. |
Venezuela |
19.90% |
|
11 |
Gallivat Corporation |
Panama |
100% |
|
12 |
Global Panama Marine Service, Inc. |
Panama |
100% |
|
13 |
GM Offshore, Inc. |
Delaware |
100% |
|
14 |
Gorgon NewCo, LLC |
Delaware |
100% |
|
15 |
Gulf Fleet Abu Dhabi |
Abu Dhabi |
49% |
|
16 |
Gulf Fleet Middle East Limited |
Cayman Islands |
100% |
|
17 |
Gulf Fleet Supply Vessels, L.L.C. |
Louisiana |
100% |
|
18 |
Gulf Offshore Marine International, S. de R.L. |
Panama |
100% |
|
19 |
GulfMark Americas, Inc. |
Delaware |
100% |
|
20 |
GulfMark Asia Pte. Ltd. |
Singapore |
100% |
|
21 |
GulfMark de Mexico, S. de R.L. de C.V. |
Mexico |
100% |
|
22 |
GulfMark Malaysia, Inc. |
Malaysia |
100% |
|
23 |
GulfMark Malta Limited |
Malta |
100% |
|
24 |
GulfMark Management, Inc. |
Delaware |
100% |
|
25 |
GulfMark Maritime S. de R.L. de C.V. |
Mexico |
100% |
|
26 |
GulfMark North Sea Limited |
United Kingdom |
100% |
|
27 |
GulfMark Oceans, L.P. |
Cayman Islands |
100% |
|
28 |
GulfMark Resources, LLC |
Delaware |
100% |
|
29 |
GulfMark Servicios de Mexico, S. de R.L. de C.V. |
Mexico |
49% |
|
30 |
GulfMark Servicos Maritimos do Brasil Limitada |
Brazil |
100% |
|
31 |
GulfMark Shipping, LLC |
Delaware |
100% |
|
32 |
GulfMark UK International Limited |
United Kingdom |
100% |
|
33 |
Hilliard Oil & Gas, Inc. |
Nevada |
100% |
|
34 |
Indigo Fleet Limited |
Cayman Islands |
100% |
|
35 |
International Maritime Services, Inc. |
Cayman Islands |
100% |
|
36 |
Java Boat Corporation |
Louisiana |
100% |
|
37 |
JB Holding Company B.V. |
Netherlands |
100% |
|
38 |
Logistica Mexicana del Caribe, S. de R.L. de C.V. |
Mexico |
100% |
|
39 |
Maré Alta do Brasil Navegacão Ltda. |
Brazil |
100% |
|
40 |
Middle East Ships Limited |
Cayman Islands |
100% |
|
41 |
Navegadores Servicos de Apoio Maritimo Ltda. |
Brazil |
100% |
|
42 |
Naviera Tidex, S. de R.L. de C.V. |
Mexico |
49% |
Exhibit 21.
| Name of Subsidiary or Organization |
Jurisdiction of Incorporation |
Percentage of Voting Securities Owned |
|
|
43 |
Pacific Tidewater Pty. Ltd. |
Australia |
100% |
|
44 |
Pan Marine do Brasil Ltda. |
Brazil |
100% |
|
45 |
Pan Marine International, Inc. |
Cayman Islands |
100% |
|
46 |
Pental Insurance Co. Ltd. |
Bermuda |
100% |
|
47 |
PT Tidewater Marine Offshore |
Indonesia |
48.98% |
|
48 |
Purple Fleet Limited |
Cayman Islands |
100% |
|
49 |
S.O.P., Inc. |
Louisiana |
100% |
|
50 |
SEA Maritime Services Pte. Ltd. |
Singapore |
100% |
|
51 |
Serrata Investments, Inc. |
Philippines |
40% |
|
52 |
Servicios Costa Afuera de Mexico, S. de R.L. de C.V. |
Mexico |
100% |
|
53 |
Southern Ocean Services Pte. Ltd. |
Singapore |
100% |
| 54 | TDW International Unrestricted, Inc. | Cayman Islands | 100% |
| 55 | TDW International Vessels (Unrestricted), LLC | Delaware | 100% |
| 56 | TDW International Vessels (Unrestricted) II, LLC | Delaware | 100% |
| 57 | TDW Marine Oceans, LLC | Delaware | 100% |
|
58 |
Tide States Vessels, L.L.C. |
Louisiana |
100% |
|
59 |
Tide States, L.L.C. |
Louisiana |
100% |
|
60 |
Tidewater (India) Private Limited |
India |
100% |
|
61 |
Tidewater Adonai Services Limited |
Ghana |
49% |
|
62 |
Tidewater Al Rushaid Co. Ltd. |
Saudi Arabia |
50% |
|
63 |
Tidewater America, L.L.C. |
Delaware |
100% |
|
64 |
Tidewater Angola Marine Services, Ltd. |
Cayman Islands |
100% |
|
65 |
TTidewater Angola Marine, Ltd. |
Cayman Islands |
100% |
|
66 |
Tidewater Bahagia (B) Sdn. Bhd. |
Brunei |
100% |
|
67 |
Tidewater Caribe, C.A. |
Venezuela |
100% |
|
68 |
Tidewater Corporate Services, L.L.C. |
Delaware |
100% |
|
69 |
Tidewater Crewing Limited |
Cayman Islands |
100% |
|
70 |
Tidewater Cypriot Offshore Limited |
Cyprus |
100% |
|
71 |
Tidewater Cyprus Limited |
Cyprus |
100% |
|
72 |
Tidewater de Mexico, S. de R.L. de C.V. |
Mexico |
49% |
| 73 | Tidewater Dutch Maritime Holdings Cooperatief UA | Netherlands | 100% |
|
74 |
Tidewater Emergency Response Services PTE. LTD. |
Singapore |
100% |
|
75 |
Tidewater GOM Limited |
Cayman Islands |
100% |
|
76 |
Tidewater GOM, Inc. |
Louisiana |
100% |
| 77 | Tidewater Investment SRL | Barbados | 100% |
| 78 | Tidewater Marine AS | Norway | 100% |
|
79 |
Tidewater Marine Fleet, L.L.C. |
Louisiana |
100% |
|
80 |
Tidewater Marine Gabon S.A. |
Gabon |
100% |
|
81 |
Tidewater Marine Hulls, L.L.C. |
Louisiana |
100% |
|
82 |
Tidewater Marine International Pte. Ltd. |
Singapore |
100% |
|
83 |
Tidewater Marine International, Inc. |
Cayman Islands |
100% |
| 84 | Tidewater Marine Offshore Services LLC | Qatar | 49% |
| Name of Subsidiary or Organization |
Jurisdiction of Incorporation |
Percentage of Voting Securities Owned |
|
|
85 |
Tidewater Marine Service (M) Sdn. Bhd. |
Malaysia |
100% |
|
86 |
Tidewater Marine Ships, L.L.C. |
Louisiana |
100% |
|
87 |
Tidewater Marine UK Ltd. |
United Kingdom |
100% |
|
88 |
Tidewater Marine Vessels, L.L.C. |
Louisiana |
100% |
|
89 |
Tidewater Marine, L.L.C. |
Louisiana |
100% |
|
90 |
Tidewater Mexico Holding, L.L.C. |
Delaware |
100% |
|
91 |
Tidewater Navegacao Offshore Ltda. |
Brazil |
100% |
|
92 |
Tidewater Norge AS |
Norway |
100% |
|
93 |
Tidewater Offshore (North Sea) Limited |
United Kingdom |
100% |
|
94 |
Tidewater Offshore Crewing PTE. LTD. |
Singapore |
100% |
| 95 | Tidewater Offshore Crewing Services Ukraine Limited | Ukraine | 100% |
|
96 |
Tidewater Offshore Holdings Limited |
Bermuda |
100% |
|
97 |
Tidewater Offshore Limited |
Bermuda |
100% |
|
98 |
Tidewater Offshore NZ Limited |
New Zealand |
100% |
|
99 |
Tidewater Offshore Operations PTE. LTD. |
Singapore |
100% |
|
100 |
Tidewater Offshore Pty Limited |
Australia |
100% |
|
101 |
Tidewater Offshore Sdn Bhd |
Malaysia |
49% |
|
102 |
Tidewater Offshore Services PTE. LTD. |
Singapore |
100% |
|
103 |
Tidewater Personnel UK LTD |
United Kingdom |
100% |
|
104 |
Tidewater Production Solutions PTE. LTD. |
Singapore |
100% |
|
105 |
Tidewater Rederi AS |
Norway |
100% |
|
106 |
Tidewater Salvage PTE. LTD. |
Singapore |
100% |
|
107 |
Tidewater Seabed Shipping AS |
Norway |
100% |
|
108 |
Tidewater Ship Management Limited |
Hong Kong |
100% |
|
109 |
Tidewater Support Services Limited |
United Kingdom |
100% |
|
110 |
Tidewater Venture, Inc. |
Delaware |
100% |
|
111 |
Troms Offshore Management AS |
Norway |
100% |
|
112 |
Troms Offshore Supply AS |
Norway |
100% |
|
113 |
Turquoise Fleet Limited |
Mauritius |
100% |
|
114 |
Twenty Grand (Brazil), L.L.C. |
Louisiana |
100% |
|
115 |
Twenty Grand Marine Service, L.L.C. |
Louisiana |
100% |
|
116 |
VTG Ships Limited |
Cayman Islands |
100% |
|
117 |
Zapata Gulf Marine, L.L.C. |
Louisiana |
100% |
|
NOTE: The Company has elected to exclude certain subsidiaries that do not constitute a “Significant Subsidiary” as set forth in Section 601(b)(21) of Regulation S-K. |