HELIX ENERGY SOLUTIONS GROUP INC 10-K

Item 2. Properties VESSELS AND OTHER OPERATING ASSETS As of December 31, 2025, our fleet included 26 owned vessels, eight IRSs, three SILs, the ROAM, 20 P&A systems, six CT systems, 39 ROVs, six trenchers and three IROV boulder grabs. We also had seven vessels under time charter agreements. All of our chartered vessels and 11 of our owned vessels have DP capabilities specifically designed to meet the needs of our customers’ offshore activities. Our Seawell and Well Enhancer vessels also have built-in saturation diving systems. Listing of Vessels and Other Assets Related to Operations as of December 31, 2025 (1) ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Placed ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Flag ​ in ​ Length ​ ​ ​ ​ ​ ​ State ​ ​ ​ Service (2) ​ ​ ​ (Feet) ​ ​ ​ DP Floating Production Unit — ​ ​ ​ ​ Helix Producer I Bahamas 4/2009 528 DP2 Well Intervention — ​ ​ ​ ​ Q4000 (3) U.S. 4/2002 312 DP3 Seawell (4) U.K. 7/2002 368 DP2 Well Enhancer (4) U.K. 10/2009 432 DP3 Q5000 Bahamas 4/2015 358 DP3 Sea Helix 1 (5) Bahamas 6/2016 521 DP3 Siem Helix 2 (5) Bahamas 2/2017 521 DP3 Q7000 Bahamas 1/2020 320 DP3 8 IRSs, 3 SILs and the ROAM (6) — Various — — Helix Alliance — ​ ​ ​ ​ EPIC Hedron (heavy lift barge) Vanuatu 7/2022 400 — 9 liftboats, 6 OSVs, 3 DSVs and 1 crew boat U.S. 7/2022 Various DP1 (7) 20 P&A systems and 6 CT systems — Various — — Robotics — ​ ​ ​ ​ 39 ROVs, 6 Trenchers and 3 IROV boulder grabs (4), (8) — Various — — 5 chartered robotics support vessels (5) Various Various 240 - 419 DP2 or DP3 30 Table of Contents (1) We maintain our vessels in accordance with standards of seaworthiness, safety and health set by governmental regulations and classification organizations. We maintain our fleet to the standards for seaworthiness, safety and health set by the ABS, Bureau Veritas (“BV”), Det Norske Veritas (“DNV”), Lloyds Register of Shipping (“Lloyds”), and the U.S. Coast Guard. ABS, BV, DNV and Lloyds are classification societies used by vessel owners to certify that their vessels meet certain structural, mechanical and safety equipment standards. (2) Represents the date we placed our owned vessels in service (rather than the date of commissioning) or the date the original charters for our chartered vessels commenced, as applicable. (3) Subject to a vessel mortgage securing our MARAD Debt described in Note 7. (4) Serves as security for the Amended ABL Facility described in Note 7. (5) Vessels under time charter agreements. (6) We own a 50% interest in the ROAM and three of the IRSs. (7) DP capabilities are only applicable to five OSVs. (8) Average age of our Robotics assets is approximately 13.0 years . ​ We incur routine dry dock, inspection, maintenance and repair costs pursuant to applicable statutory regulations in order to maintain our vessels in accordance with the rules of the applicable class society. In addition to complying with these requirements, we have our own asset maintenance programs that we believe help us to continue to provide our customers with well-maintained, reliable assets. FACILITIES Our corporate headquarters are located at 3505 West Sam Houston Parkway North, Suite 400, Houston, Texas 77043. Except for two owned properties related to Helix Alliance, we currently lease all of our facilities, which are primarily located in Texas, Louisiana, Scotland, Singapore and Brazil. ​