SIEM Industries
SIEM Industries is a Luxembourg-incorporated industrial holding company operating through autonomous affiliates in offshore energy services (Subsea7 stake, Siem Offshore, EMGS), ocean shipping (Siem Shipowning, Siem Car Carriers, Seven Yield, Reefers Norway), and financial investments, serving enterprise clients via long-term charter contracts.
- Company typePublic
- Founded1980
- HeadquartersGeorge Town, Cayman Islands
- Headcount1–10
- GTM typeB2B
- OfferingServices
What SIEM Industries does
SIEM Industries S.A. is a Luxembourg-incorporated industrial holding company formed in 1980, operating through autonomous affiliates across three segments: Offshore Energy Services, Ocean Shipping, and Financial Investments. The Offshore Energy Services segment is anchored by minority stakes in Subsea7 S.A. (subsea engineering and construction for oil and gas as well as offshore wind installations) and EMGS (electromagnetic formation data for offshore energy field mapping), complemented by wholly-owned Siem Offshore AS which owns 9 offshore vessels (OSCV, AHTS, and PSV types) time-chartered to enterprise clients. The Ocean Shipping segment encompasses Siem Shipowning Inc. (6-vessel international shipping fleet), Siem Car Carriers AS (global PCTC and RO-RO liner service for automobiles, trucks, and project cargo), Seven Yield (long-term ship leasing via bareboat charters to industrial shipping and offshore clients), and a 50% interest in Reefers Norway AS (6 reefer vessels for refrigerated cargo). The Financial Investments segment manages cash generated by group activities across listed and unlisted shares, bonds, financial instruments, and private equity within core areas of expertise.
The company generates revenue primarily through long-term time charter and bareboat charter contracts with enterprise clients in the offshore energy and maritime shipping industries, supplemented by vessel leasing income and financial investment returns. The group is currently unprofitable with 0% return on equity as of May 2026, and revenue is not publicly disclosed. The company trades on OTCPK under ticker SEMU.F with a market capitalization of approximately $1.02 billion, and is 79.97%-controlled by the Telos Trust linked to founder and Chairman Kristian Siem and his family — a structure reinforced by a May 2026 share buyback at $75.00 per share (up to 500,000 shares / $37.5 million) approved by 98.18% of voting shareholders. Headcount stood at 955 employees across group companies in 2025 (essentially flat versus 964 in 2024), with offices in Luxembourg, Kristiansand, Sutton (UK), and Singapore.
Recent strategic activity has centered on fleet rationalization and expansion: three second-hand PCTC vessels were acquired in February-April 2026, the offshore subsea construction vessel Siem Day was divested in January 2026, the reefer Southampton Star was sold in April 2026, and the remaining 80% of Siem Oil Service Invest Holdings was acquired in April 2025 with vessels transferred to Siem Offshore in May 2025. The most consequential strategic positioning is the February 2025 memorandum of understanding with Eni S.p.A. and CDP Equity S.p.A. regarding the cross-border merger of Subsea7 and Saipem, in which Siem is a key stakeholder.
SIEM Industries firmographics
Firmographics- Name
- SIEM Industries
- Legal name
- Siem Industries S.A.
- Website
- https://siemindustries.com
- Company type
- Public
- Founded year
- 1980
- Operating status
- Operating
- Headcount range
- 1–10 employees
- Short description
- SIEM Industries is a Luxembourg-incorporated industrial holding company operating through autonomous affiliates in offshore energy services (Subsea7 stake, Siem Offshore, EMGS), ocean shipping (Siem Shipowning, Siem Car Carriers, Seven Yield, Reefers Norway), and financial investments, serving enterprise clients via long-term charter contracts.
- Ownership category
- akta.pro rank
SIEM Industries industry classification
Industry- Product category
- Industrial Shipping & Offshore Services
- NAICS
- Management of Companies and Enterprises (55111), Ship and Boat Building (3366), Mining and Oil and Gas Field Machinery Manufacturing (33313)
- SIC
- Water Transportation (4400), Services-Equipment Rental & Leasing, Nec (7359)
- akta.pro primary industry
- Marine & Offshore Energy O&M (Offshore Wind, Platforms, Subsea Assets) (EUAEAGAO)
- akta.pro secondary industry
- Offshore Wind & Renewable Support Vessel Construction (SOV, CTV, WTIV) (IMAJACAG)
Keywords
Where SIEM Industries is headquartered
LocationHeadquarters
- HQ city
- George Town
- HQ country
- Cayman Islands
Offices4 records
Markets served
SIEM Industries business model
Business model- GTM type
- B2B
- Offering type
- Services
- Cost components
- Operations, Personnel, Infrastructure, Supply Chain, Others
Revenue model
- Offshore Energy Services: Revenue generated through Subsea7 (engineering and underwater construction for oil industry and offshore wind farm installations), Siem Offshore (offshore support vessels chartered out), and EMGS (formation data for offshore energy fields). Vessels are time chartered to offshore services customers on long-term contracts.
- Ocean Shipping: Revenue from vessel ownership and operation for ocean transportation of automobiles, trucks, refrigerated cargo (reefers), and project cargo. Siem Shipowning Inc. operates 6 vessels. Siem Car Carriers AS operates a global liner service. Seven Yield provides long-term ship leasing and bareboat charter solutions. Revenue is generated via vessel charters and leasing arrangements with shipping clients.
- Financial Investments: Professional management and risk-adjusted return on cash generated by the group's offshore energy services and ocean shipping activities. Investments include listed and unlisted shares, bonds, financial instruments, and private equity.
Go-to-market motion1 record
Distribution channels2 records
SIEM Industries product offering
Product offeringCore offering
SIEM Industries S.A. is an industrial holding company that operates through autonomous affiliates across three segments: Offshore Energy Services (engineering and underwater construction via Subsea 7, offshore support vessels via Siem Offshore, and electromagnetic formation data via EMGS), Ocean Shipping (vessel ownership and operation for transport of automobiles, trucks, refrigerated cargo, and project cargo via Siem Shipping, Siem Car Carriers, and Siem Shipowning, plus ship leasing solutions via Seven Yield), and Financial Investments (listed and unlisted shares, bonds, financial instruments, and private equity).
Product overview
SIEM Industries is an industrial holding company organized into three core segments: Offshore Energy Services, Ocean Shipping, and Financial Investments. The company operates through autonomous affiliates rather than as a unified product platform. In Offshore Energy Services, the portfolio includes Subsea 7 (engineering and underwater construction for oil/gas and offshore wind), Siem Offshore (offshore support vessels), and EMGS (electromagnetic formation data for offshore energy fields). The Ocean Shipping segment encompasses Siem Shipping (refrigerated cargo and automobile transportation), Siem Car Carriers (global RO-RO liner service), and Seven Yield (ship leasing solutions). Financial Investments manages listed/unlisted shares, bonds, financial instruments, and private equity. The company holds interests in various subsidiaries including Reefers Norway, Siem Shipowning, and Siem Oil Service Invest Holdings.
Differentiator
Problem solved
Functional benefit
Products and services
- Subsea 7 Engineering and underwater construction services for the oil and gas industry, including offshore wind farm installations for electricity generation. Served through subsidiary Subsea 7 S.A.
- Siem Offshore Owner and operator of 9 offshore support vessels (OSCV, AHTS, PSV) time chartered out in the offshore services industry. Served through indirect Norwegian subsidiary Siem Offshore AS.
- EMGS (Electromagnetic Geoservices) Provides electromagnetic formation data to determine the location and size of offshore energy fields. Minority investment stake of SIEM Industries.
- Siem Car Carriers Global liner service specializing in the movement of new automobiles, roll on roll off (RO-RO) and project cargo, operating PCTC vessels. Wholly owned indirect Norwegian subsidiary of SIEM Industries.
- Siem Shipping Ocean transportation of automobiles, trucks, and refrigerated fruit and vegetables to clients on a long-term basis. Operates through Siem Shipowning Inc. and Reefers Norway AS.
- Seven Yield Wholly owned subsidiary providing long-term ship leasing solutions to the industrial shipping and offshore sector through bareboat charter contracts of existing and newbuild vessels. Singapore-based.
- Financial Investments Professional management and risk-adjusted return on cash generated by group activities, with investments in listed and unlisted shares, bonds, financial instruments, and private equity primarily within core expertise areas.
Companies that use SIEM Industries
Customer profileSegments3 records
Ideal customer profiles3 records
SIEM Industries technology and API
TechnologyTechnology focussed No
API detail
- Has API
- No
- API docs
- API detail
Core technology
AI maturity
App detail
SIEM Industries partnerships and signals
Strategic signalPartnerships
Five partnerships are on record, tiered core and minor.
- Eni S.p.AcoreSiem Industries S.A. entered into a memorandum of understanding (MoU) with Eni S.p.A. (and CDP Equity S.p.A., controlling shareholders of Saipem) in connection with the cross-border merger of Subsea7 S.A. and Saipem S.p.A. The MoU will be replaced by a shareholders agreement.
- CDP Equity S.p.AcoreSiem Industries S.A. entered into a memorandum of understanding (MoU) with CDP Equity S.p.A. (and Eni S.p.A., controlling shareholders of Saipem) in connection with the cross-border merger of Subsea7 S.A. and Saipem S.p.A. The MoU will be replaced by a shareholders agreement.
- Grimaldi GroupminorSiem Industries subsidiary Seven Yield Holdings Pte Ltd reached agreement to acquire the MV Eurocargo Catania from Grimaldi Group in Italy. The 3,700 lane metre RoRo vessel was delivered by Odense Shipyard in Denmark in 2011 and taken over in January 2025.
- Unike HotellerminorThe Siem Group, as new owner of Ramme, entered an agreement with Unike Hoteller for the management of Ramme Fjordhotell. Unike Hoteller commenced work on including Ramme in its hotel portfolio, with formal takeover on 1 January 2025.
- Aurora Offshore A/SminorSiem Offshore A/S entered into agreements with Aurora Offshore A/S for the technical and commercial management of the OSV fleet. The management change from Sea1 Offshore took place during Q1 2025. Siem Offshore A/S also agreed to acquire 40% ownership in Aurora Offshore A/S.
Scale indicators9 records
Recent moves9 records
Expansion highlights6 records
SIEM Industries competitors and assessment
Company assessmentDirect peers
- Vroon: Dutch family-controlled shipping/offshore operator with PSVs, AHTS and offshore wind support vessels. Closely comparable to Siem Offshore's vessel mix and the long-term time-charter commercial model.
- Tidewater Inc. World's largest OSV owner-operator with global fleet of more than 200 vessels. Closest direct competitor to Siem Offshore in the OSV market, sharing time-charter exposure to major offshore operators.
- BW Offshore: Singapore-listed FPSO and offshore production contractor owned by the BW Group shipping/oil-services conglomerate. Comparable offshore energy services profile alongside Seven Yield's ship-leasing offerings.
- Solstad Offshore: Norwegian OSV specialist operating AHTS, PSV and subsea construction vessels. Direct competitor for the same North Sea OSV charter market as Siem Offshore's 9-vessel fleet.
- DOF Group ASA: Norwegian subsea and OSV operator (AHTS, PSV, subsea construction) recently emerged from restructuring. Direct competitor in the same North Sea offshore support vessel pool and subsea installation market as Siem Offshore.
- SEACOR Holdings: U.S. holding company owning SEACOR Marine, with OSVs, liftboats, and offshore energy services — directly comparable to Siem Offshore segment. Similar diversified offshore/business mix and active fleet management.
- Stolt-Nielsen Limited: Norway-based, Luxembourg-listed industrial holding combining tanker, terminal, and aquaculture operations — closely comparable structure to Siem's diversified shipping/offshore/finance holding model. Direct competitor in offshore chemical logistics and shipping asset ownership.
- Teekay Corporation: Bermuda-based holding with parallel exposure to offshore (Teekay Offshore/EOLP), shuttle tankers, and LNG. Operates a comparable mixed-segment strategy with public-market trading constraints and similar tonnage-heavy balance sheet.
Regional players
- Havila Shipping: Norwegian coastal and offshore supply vessel operator. Compares primarily to the Norwegian-registry portions of Siem Offshore's PSV/AHTS fleet, but on a smaller, regionally focused footprint.
Emerging players
- GC Rieber Shipping: Norwegian smaller-scale offshore/subsea shipping company focused on high-end subsea and offshore wind operations. Smaller but technically comparable to Siem Offshore's renewable-energy-tinged strategy.
Market position
Strengths5 records
Weaknesses5 records
Competitive moat4 records
Key risks7 records
Key highlights7 records
Customer concentration
SIEM Industries social profiles
Digital presenceSIEM Industries financial estimates
Financial estimateRevenue estimate
Valuation estimate
SIEM Industries leadership team
Management profileNumber of profiles
Profiles9 records
SIEM Industries subsidiaries and ownership
Company hierarchySubsidiaries14 records
SIEM Industries funding detail
Funding detailFunding overview
Funding rounds
Investors
Funding detail is available on the Subscription and Enterprise plan.Contact sales →
SIEM Industries M&A and investment
M&A and investmentM&A
Investments
M&A and investment is available on the Subscription and Enterprise plan.Contact sales →
Frequently asked questions about SIEM Industries
What does SIEM Industries do?
SIEM Industries S.A. is an industrial holding company that operates through autonomous affiliates across three segments: Offshore Energy Services (engineering and underwater construction via Subsea 7, offshore support vessels via Siem Offshore, and electromagnetic formation data via EMGS), Ocean Shipping (vessel ownership and operation for transport of automobiles, trucks, refrigerated cargo, and project cargo via Siem Shipping, Siem Car Carriers, and Siem Shipowning, plus ship leasing solutions via Seven Yield), and Financial Investments (listed and unlisted shares, bonds, financial instruments, and private equity).
Is SIEM Industries a public or private company?
SIEM Industries is a public company. It is classified as family owned and is currently operating.
When was SIEM Industries founded?
SIEM Industries was founded in 1980. It employs 1 to 10 people.
Where is SIEM Industries based?
SIEM Industries is headquartered in George Town, Cayman Islands.
How does SIEM Industries make money?
Three revenue lines are on record. Offshore Energy Services are the primary driver. The others are ocean Shipping and financial Investments.
Who are SIEM Industries's main competitors?
Direct peers on record are Vroon, Tidewater Inc., BW Offshore, Solstad Offshore, DOF Group ASA, SEACOR Holdings, Stolt-Nielsen Limited and Teekay Corporation. Havila Shipping is listed as a regional player. GC Rieber Shipping is listed as an emerging player.
Does SIEM Industries have an API?
No public API is recorded for SIEM Industries.
What industry is SIEM Industries in?
SIEM Industries's product category is Industrial Shipping & Offshore Services. Its primary akta.pro industry code is EUAEAGAO, Marine & Offshore Energy O&M (Offshore Wind, Platforms, Subsea Assets), with a secondary code of IMAJACAG, Offshore Wind & Renewable Support Vessel Construction (SOV, CTV, WTIV). Its NAICS code is 55111 and its SIC code is 4400.