EX-21 3 ex_311051.htm EXHIBIT 21

Exhibit 21

List of Tidewater Inc. Subsidiaries as of December 31, 2021

| 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 | Antilles Marine Service Limited | Trinidad and Tobago | 50%
4 | Arabia Shipping Limited | Cayman Islands | 100%
5 | Arrendadora de Naves del Golfo, S.A. de C.V., SOFOM, ENR | Mexico | 100%
6 | Chalvoyage (M) Sdn. Bhd. | Malaysia | 49%
7 | Compania Marítima de Magallanes Limitada | Chile | 100%
8 | Divetide Limited | Thailand | 49%
9 | DTDW Holdings Limited | Cyprus | 40%
10 | DTDW Marine Services B.V. | Netherlands | 40%
11 | Equipo Mara, C.A. | Venezuela | 19.90%
12 | Global Panama Marine Service, Inc. | Panama | 100%
13 | GM Offshore, Inc. | Delaware | 100%
14 | GOMI Holdings, Inc. | Delaware | 100%
15 | Gorgon NewCo, LLC | Delware | 100%
16 | Gulf Channel Offshore Servicos LDA | Angola | 49%
17 | Gulf Fleet Abu Dhabi | Abu Dhabi | 49%
18 | Gulf Fleet Middle East Limited | Cayman Islands | 100%
19 | Gulf Fleet N.V. | Netherlands Antilles | 100%
20 | Gulf Fleet Supply Vessels, L.L.C. | Louisiana | 100%
21 | Gulf Offshore Marine International, S. de R.L. | Panama | 100%
22 | GulfMark Americas, Inc. | Delaware | 100%
23 | GulfMark Asia Pte. Ltd. | Singapore | 100%
24 | GulfMark Capital, LLC | Delaware | 100%
25 | GulfMark de Mexico, S. de R.L. de C.V. | Mexico | 100%
26 | GulfMark Foreign Investments LLC | Delaware | 100%
27 | GulfMark Guernsey International Limited | Guernsey | 100%
28 | GulfMark Malaysia, Inc. | Malaysia | 100%
29 | GulfMark Malaysia Sdn. Bhd. | Malaysia | 49%
30 | GulfMark Malta Limited | Malta | 100%
31 | GulfMark Management, Inc. | Delaware | 100%
32 | GulfMark Marine Trinidad Limited | Trinidad & Tobago | 49%
33 | GulfMark Maritime S. de R.L. de C.V. | Mexico | 100%
34 | GulfMark North Sea Limited | United Kingdom | 100%
35 | GulfMark Oceans, L.P. | Cayman Islands | 100%
36 | GulfMark Resources, LLC | Delaware | 100%
37 | GulfMark Servicios de Mexico, S. de R.L. de C.V. | Mexico | 49%
38 | GulfMark Servicos Maritimos do Brasil Limitada | Brazil | 100%
39 | GulfMark Shipping, LLC | Delaware | 100%
40 | GulfMark Thailand, LLC | Delaware | 100%
41 | GulfMark UK International Limited | United Kingdom | 100%
42 | Hilliard Oil & Gas, Inc. | Nevada | 100%
43 | Indigo Fleet Limited | Cayman Islands | 100%
44 | International Maritime Services, Inc. | Cayman Islands | 100%
45 | Java Boat Corporation | Louisiana | 100%

46 | Java Boat Corporation B.V. | Netherlands | 100%
47 | JB Holding Company B.V. | Netherlands | 100%
48 | Logistica Mexicana del Caribe, S. de R.L. de C.V. | Mexico | 100%
49 | Maré Alta do Brasil Navegacão Ltda. | Brazil | 100%
50 | Mashhor Marine Sdn. Bhd. | Brunei | 70%
51 | Middle East Ships Limited | Cayman Islands | 100%
52 | Navegadores Servicos de Apoio Maritimo Ltda. | Brazil | 100%
53 | Naviera Tidex, S. de R.L. de C.V. | Mexico | 49%
54 | O.I.L. (Nigeria) Limited | Nigeria | 82.10%
55 | Offshore Labuan Leasing Inc. | Labuan | 100%
56 | Offshore Marine Inc. | Labuan | 49%
57 | Pacific Tidewater Pty. Ltd. | Australia | 100%
58 | Pan Marine do Brasil Ltda. | Brazil | 100%
59 | Pan Marine International Dutch Holdings, L.L.C. | Louisiana | 100%
60 | Pan Marine International, Inc. | Cayman Islands | 100%
61 | Pental Insurance Co. Ltd. | Bermuda | 100%
62 | Point Marine, L.L.C. | Louisiana | 100%
63 | Purple Fleet Limited | Cayman Islands | 100%
64 | Quality Shipyards, L.L.C. | Louisiana | 100%
65 | S.O.P., Inc. | Louisiana | 100%
66 | SEA Maritime Services Pte. Ltd. | Singapore | 100%
67 | Semaring Enterprise Sdn. Bhd. | Malaysia | 51%
68 | Semaring Logistics (M) Sdn. Bhd. | Malaysia | 49%
69 | Servicios Costa Afuera de Mexico, S. de R.L. de C.V. | Mexico | 100%
70 | Sonatide Marine Services, Ltd. | Cayman Islands | 49%
71 | Sonatide Marine, Ltd. | Cayman Islands | 49%
72 | Southern Ocean Services Pte. Ltd. | Singapore | 100%
73 | TDW International Unrestricted, Inc. | Cayman Islands | 100%
74 | Tide States Vessels, L.L.C. | Louisiana | 100%
75 | Tide States, L.L.C. | Louisiana | 100%
76 | Tideflo Marine Services Limited | Nigeria | 40%
77 | Tidewater (India) Private Limited | India | 100%
78 | Tidewater Al Rushaid Co. Ltd. | Saudi Arabia | 50%
79 | Tidewater Caribe, C.A. | Venezuela | 100%
80 | Tidewater Corporate Services, L.L.C. | Delaware | 100%
81 | Tidewater Crewing Guernsey Ltd. | Guernsey | 100%
82 | Tidewater Crewing Limited | Cayman Islands | 100%
83 | Tidewater Cyprus Limited | Cyprus | 100%
84 | Tidewater de Mexico, S. de R.L. de C.V. | Mexico | 49%
85 | Tidewater Dutch Holdings Cooperatief U.A. | Netherlands | 100%
86 | Tidewater GOM, Inc. | Louisiana | 100%
87 | Tidewater GOM Limited | Cayman Islands | 100%
88 | Tidewater Investment Cooperatief U.A. | Netherlands | 100%
89 | Tidewater Investment SRL | Barbados | 100%
90 | Tidewater Marine AS | Norway | 100%
91 | Tidewater Marine Australia Pty Ltd | Australia | 100%
92 | Tidewater Marine Charter Services Pte. Ltd. | Singapore | 100%
93 | Tidewater Marine Fleet, L.L.C. | Louisiana | 100%
94 | Tidewater Marine Gabon S.A. | Gabon | 100%

95 | Tidewater Marine Hulls, L.L.C. | Louisiana | 100%
96 | Tidewater Marine Indonesia Limited | Vanuatu | 100%
97 | Tidewater Marine International Dutch Holdings, L.L.C. | Louisiana | 100%
98 | Tidewater Marine International Pte. Ltd. | Singapore | 100%
99 | Tidewater Marine International, Inc. | Cayman Islands | 100%
100 | Tidewater Marine Sakhalin, L.L.C. | Louisiana | 100%
101 | Tidewater Marine Service (M) Sdn. Bhd. | Malaysia | 100%
102 | Tidewater Marine Ships, L.L.C. | Louisiana | 100%
103 | Tidewater Marine Technical Services (Shenzhen) Co., Ltd. | China | 100%
104 | Tidewater Marine UK Ltd. | United Kingdom | 100%
105 | Tidewater Marine Vanuatu Limited | Vanuatu | 100%
106 | Tidewater Marine Vessels, L.L.C. | Louisiana | 100%
107 | Tidewater Marine West Indies Limited | Bahamas | 100%
108 | Tidewater Marine Western, L.L.C. | Delaware | 100%
109 | Tidewater Marine, L.L.C. | Louisiana | 100%
110 | Tidewater Mexico Holding, L.L.C. | Delaware | 100%
111 | Tidewater Norge AS | Norway | 100%
112 | Tidewater Offshore Sdn Bhd | Malaysia | 49%
113 | Tidewater Personnel UK LTD | United Kingdom | 100%
114 | Tidewater Rederi AS | Norway | 100%
115 | Tidewater Subsea ROV, L.L.C. | Louisiana | 100%
116 | Tidewater Subsea, L.L.C. | Louisiana | 100%
117 | Tidewater Support Services Limited | England | 100%
118 | Tidewater Venture, Inc. | Delaware | 100%
119 | Tidex Nigeria Limited | Nigeria | 60%
120 | Troms Offshore Fleet Holding AS | Norway | 100%
121 | Troms Offshore Management AS | Norway | 100%
122 | Troms Offshore Supply AS | Norway | 100%
123 | Twenty Grand (Brazil), L.L.C. | Louisiana | 100%
124 | Twenty Grand Marine Service, L.L.C. | Louisiana | 100%
125 | Vesselogistics Limited | Cyprus | 100%
126 | VTG Ships Limited | Cayman Islands | 100%
127 | VTG Supply Boat Liberia Inc. | Liberia | 100%
128 | Zapata Gulf Marine, L.L.C. | Louisiana | 100%
129 | Zapata Marine Service (Nigeria) Limited | Nigeria | 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.