Mibau and Stema

What Mibau and Stema does

Mibau Stema Group is one of the largest suppliers of mineral building materials in Northern and Central Europe, producing and distributing aggregates - primarily crushed rock, sand, and gravel - for the asphalt, construction, concrete, infrastructure, and offshore industries. The group operates an integrated value chain running from extraction at three Norwegian quarries (Jelsa, Tau, and Dirdal, with Jelsa described as Europe's largest of its kind at ~13 million tonnes per year and total capacity exceeding 20 million tonnes) through to delivery at customer construction sites via its own fleet of seven self-discharging vessels and a network of 40+ terminals along the North Sea and Baltic coasts across seven countries (Germany, Denmark, Norway, the UK, France, the Netherlands, and Poland).

The company's product portfolio centres on four categories - aggregates, infrastructure materials, rock armour (for coastal and maritime protection, expanded via the 2025 Titania partnership), and offshore aggregates - with technically differentiated supporting assets including the world's first fully automated Laboratory 4.0 for grain size distribution (EN 933-1) at Jelsa, drone-based quarry surveying, a digital delivery-request app, and custom EPD/MKI calculation tools. All three Norwegian quarries run on 100% hydropower and are certified to ISO 9001, ISO 14001, and ISO 45001, with Jelsa being the first Norwegian recipient of the Concrete Sustainability Council's Gold certificate. The group employs around 500 people and is 60%-owned by DAX-listed Heidelberg Materials AG, with the remaining shares held by the founding Hartmann family.

The business model is enterprise B2B sales-led: pricing is project-specific and quote-based, contracts are typically long-term and infrastructure-anchored (e.g., Fehmarn Belt Tunnel, Banedanmark railway modernisation, Maasvlakte, Meerwind Süd / Ost offshore wind), and revenue is generated principally from sale of bulk aggregates bundled with owned-vessel logistics and terminal handling. The group positions integrated logistics - including two newbuild dual-fuel self-unloading vessels ordered for 2028 delivery and a new ~50,000 m² Amsterdam terminal opening in 2026 - as the primary competitive lever, enabling direct quarry-to-site service for governments, engineering consultancies, contractors, and material suppliers across Northern Europe.

Name

Mibau and Stema

Legal name

Mibau Stema Group GmbH

Website

https://mibau-stema.com

Company type

Private

Founded year

1975

Operating status

Operating

Headcount range

11–50 employees

Short description

Mibau Stema Group is a European supplier of aggregates - crushed rock, sand, gravel, and rock armour - produced from three Norwegian quarries totalling 20+ million tonnes annual capacity and delivered via an owned fleet of seven self-discharging vessels and 40+ terminals across seven countries. It serves construction, infrastructure, offshore, and concrete customers across Northern and Western Europe.

Ownership category

akta.pro rank

Product category

Construction Aggregates

NAICS

Nonmetallic Mineral Mining and Quarrying (2123), Construction Sand and Gravel Mining (212321)

SIC

Mining & Quarrying Of Nonmetallic Minerals (No Fuels) (1400), Wholesale-Lumber & Other Construction Materials (5030)

akta.pro primary industry

Construction Aggregates Mining & Processing (Sand, Gravel, Crushed Stone) (IMADAAAI)

akta.pro secondary industries

Aggregate Processing & Value-Added Products (Washing, Screening, Asphalt/Concrete Aggregates) (IMAKAHAH), Sand & Gravel Extraction & Processing (IMAKAHAB), Aggregates & Dimension Stone Trading (Sand & Gravel, Crushed Stone, Limestone, Granite, Marble) (IMAKAJAG)

Keywords

• Construction aggregates supply
• Bulk material logistics
• Maritime shipping services
• Rock armour supply
• Quarry operations

Headquarters

HQ city

Grays

HQ country

United Kingdom

HQ region

Europe

Offices9 records

Markets served

GTM type

B2B

Offering type

Hardware or Manufacturing

Cost components

Operations, Supply Chain, Infrastructure, Personnel, Technology or R&D, Marketing or Sales

Revenue model

1. Aggregates Sales (Crushed Rock, Sand, Gravel): Primary revenue from extraction and sale of high-quality aggregates from Norwegian quarries. Products include crushed rock, sand, and gravel for construction, infrastructure, offshore, and coastal protection applications. Sold directly to B2B customers including asphalt plants, concrete manufacturers, contractors, and government bodies. Integrated value chain from quarry to customer.
2. Logistics and Shipping Services: Revenue generated through owned fleet of self-discharging vessels delivering aggregates from quarries to terminals and directly to construction sites. Freight and logistics services are bundled with product supply as part of the integrated offering.
3. Rock Armour and Special Project Materials: Supply of specialised rock armour products for coastal protection and maritime construction projects. Through Titania partnership, supplies sustainable rock armour in LMA and HMA sizes, including ultra-large pieces exceeding 15 tonnes.

Go-to-market motion2 records

Distribution channels4 records

Marketing channels4 records

Core offering

Mibau Stema Group extracts, processes, and supplies high-quality construction aggregates (crushed rock, sand, and gravel) from three Norwegian quarries, with an annual production capacity exceeding 20 million tonnes. The company operates a fully integrated value chain delivering aggregates from quarry to construction site via its own fleet of self-discharging vessels and a network of more than 40 terminals across Northern Europe. It also supplies specialised rock armour for coastal protection and aggregates for offshore energy infrastructure.

Product overview

Mibau Stema Group is a leading European supplier of sustainable aggregates operating an integrated production, logistics, and sales value chain. The core product portfolio consists of four main product categories — Aggregates (crushed rock, sand, gravel), Infrastructure materials, Rock Armour (coastal protection), and Offshore aggregates — sourced from three Norwegian quarries (Jelsa, Tau, Dirdal) with a combined production capacity exceeding 20 million tonnes per year. The company differentiates through its integrated logistics service: a modern fleet of seven self-discharging vessels and over 40 terminals along the North and Baltic Seas enable fast, reliable delivery from quarry to construction site. Supporting services include Laboratory 4.0 (fully automated quality control), drone-based quarry surveying, digital delivery request tools, engineering and solutions, sustainability certifications (EPDs, CSC), and disposal services. The Titania partnership adds sustainable rock armour sourced from Tellnes mine overburden. With approximately 500 employees across seven countries and operations backed by ISO certifications, the group serves the asphalt, construction, concrete, and infrastructure industries across Northern and Western Europe.

Differentiator

Problem solved

Functional benefit

Products and services

• Aggregates (Sand, Gravel, Crushed Rock) High-quality aggregates (sand, gravel, and crushed rock) produced from the Jelsa, Tau, and Dirdal quarries in Norway, sold to asphalt plants, concrete manufacturers, construction contractors, and government bodies. Overall production capacity exceeds 20 million tonnes per year, with Jelsa being Europe's largest quarry of its kind.
• Infrastructure Materials Aggregates and materials for infrastructure construction including roads, railway lines, tunnels, bridges, and general construction. Provided as solution-based material supply from quarry to construction site, optimised for project-specific technical requirements.
• Rock Armour Rock armour products for coastal protection and hydraulic engineering projects. Through the Titania partnership, sustainable rock armour is available in all LMA and HMA sizes, including ultra-large pieces exceeding 15 tonnes, sourced from Tellnes mine overburden (quartz-free metamorphic anorthosite with density approximately 2.7 t/m³).
• Offshore Aggregates Aggregates and materials for offshore construction applications including wind farm foundations, offshore platforms, and marine infrastructure. Dirdal quarry is tailored specifically to serve the offshore industry's needs.
• Aggregate Logistics Integrated logistics service for transporting aggregates from quarries to construction sites and terminals. Operated using an owned fleet of seven self-discharging vessels and over 40 terminals along the North and Baltic Seas, enabling fast, reliable delivery.
• Shipping Services Expertise in sea and river transportation of bulk materials using a fleet of fuel-efficient self-discharging vessels. Services include direct unloading at locations and water-to-land solutions for inland destinations.
• Terminal Network Services Over 40 strategically located terminals along the North and Baltic Seas in Denmark, Germany, United Kingdom, Netherlands, France, and Poland for collection and dispatch of bulk materials.
• Engineering and Solutions Engineering and consulting service accompanying customers from project concept to completion. Includes road construction optimisation, concrete mix design optimisation, rock armour structure optimisation with filter consideration, and functional use of mineral resources with technical calculations by independent engineering firms.
• Granobase® Innovative product concept for the Dutch civil engineering sector (GWW), forming the basis for new aggregate applications and solutions and positioning Mibau Stema as a full-fledged knowledge partner for Dutch municipalities, engineering consultancies, and contractors.
• Laboratory 4.0 Quality Testing World's first fully automated laboratory for grain size distribution determination in accordance with EN 933-1, located at Jelsa quarry, Norway. Features fully automated robotic sample preparation (splitting, washing, drying), automated analysis of production and ship samples, and operates 24/7.
• Drone Surveying Service Drone surveying and mapping service for quarry development and inventory tracking at terminals. Provides accurate 3D models, reduces time and effort compared to traditional ground-based survey methods, and enables optimised operations.
• Disposal Services Portfolio of disposal services ensuring effective and sustainable waste treatment for soil and construction waste, including bulk material deliveries and special transports, through a Europe-wide disposal network.

Quantifiable outcome

• 20+ million tonnes annual production capacity
• +6 more outcomes

Named customers7 records

Segments5 records

Ideal customer profiles4 records

Technology focussed No

API detail

Has API

No

API docs

API detail

Core technology

AI maturity

App detail

Feature5 records

Partnerships

Four partnerships are on record, tiered important and core.

• Port of AmsterdamimportantStrategic or Co-development Partner · 2 February 2026Cooperation with Port of Amsterdam for development of Mibau Stema Nederland's second terminal in Afrikahaven. Port provides the quayside infrastructure with 13.5m dredged water depth, enabling the two newest future self-discharging vessels to berth without restrictions. Terminal expected operational end Q2/early Q3 2026. Multimodal approach serving via sea, inland shipping, road, and rail.
• Hartmann Family and Canada Steamship Lines (CSL)importantTechnology or Integration · 28 August 2025Joint investment in two new state-of-the-art self-unloading vessels. Hartmann family (co-shareholder in Mibau Stema Group) and CSL partnering with Mibau Stema for ship construction at Chengxi Shipyard. Vessels are based on the proven blueprint of MV Starnes and MV Fjordnes (delivered 2020-2021) with significant design enhancements.
• Titania (A Kronos Company)coreStrategic or Co-development Partner · 1 January 2025Partnership to repurpose by-products from Titania's Tellnes mine (Europe's largest ilmenite source) for sustainable rock armour production. Over 100 million tonnes of rock already available from existing overburden stocks. Material is quartz-free metamorphic anorthosite with density ~2.7t/m³. Shipments handled through Titania's dedicated port facility at Jøssingfjorden. Available in all LMA and HMA sizes plus ultra-large pieces exceeding 15 tonnes. Mibau Stema provides marketing and logistics expertise; Titania provides high-quality mining by-product and century-plus mining expertise.
• Heidelberg Materials (Sand and Gravel)importantStrategic or Co-development Partner · 1 January 1994Long-standing exclusive distribution agreement for sand and gravel products from Heidelberg Materials' pits in north Germany (Langhagen, Damsdorf, and other sites). Mibau Stema distributes Heidelberg Materials' sand and gravel from five gravel pits, including Langhagen (largest in Mecklenburg-Vorpommern with 1.5 million tonnes capacity and 70 million tonnes reserves). Also distributes from four additional pits and along the Weser river.

Scale indicators10 records

Recent moves10 records

Expansion highlights6 records

Market position

Competitive moat6 records

Key risks6 records

Key highlights7 records

Customer concentration

• Facebookfacebook.com/stemashippinguk
• LinkedInlinkedin.com/company/stemashippinguk

Compliance6 records

Revenue estimate

Valuation estimate

Number of profiles

Profiles12 records

Subsidiaries7 records

Funding overview

Funding rounds

Investors

Funding detail is available on the Subscription and Enterprise plan.Contact sales →

M&A

Investments

M&A and investment is available on the Subscription and Enterprise plan.Contact sales →

Frequently asked questions about Mibau and Stema