Stump-Franki Spezialtiefbau

What Stump-Franki Spezialtiefbau does

Stump-Franki Spezialtiefbau GmbH, now operating as PORR Spezialtiefbau GmbH since January 1, 2024, is a German specialized foundation engineering contractor headquartered in Munich and operating as an independent service area within the publicly listed PORR Group. The company delivers deep foundation and underground engineering services for large-scale infrastructure and commercial construction projects, including diaphragm wall construction (Schlitzwandtechnik), bored pile systems, driven pile systems based on the proprietary Frankipfahl, ground anchoring via the Duplex Anchor system, and fully-displacing Atlas pile technology. Its intellectual property is anchored in heritage innovations dating back to 1908 (Frankipfahl invention by Edgard Frankignoul), 1969 (first German general building approval for the Duplex Anchor), 1985 (Atlas pile), and 1990 (expanded diaphragm wall capabilities), supplemented by an in-house fleet of specialized piling rigs and Atlas equipment.

The business model is project-based enterprise services delivery. Revenue is generated from one-time, quote-driven construction contracts whose value depends on project complexity, depth requirements, soil conditions, and scale. The company sells directly to general contractors, project developers, and public sector clients via a field sales motion, typically through competitive tendering for infrastructure, high-rise, industrial, and urban excavation projects. Pricing is not publicly disclosed. Since the 2024 rebrand, the entity is positioned as a full-service provider along the entire PORR construction value chain, enabling single-source delivery of complex excavation pits with all trades in-house. Geographic reach extends across Germany, Austria, Switzerland, Czech Republic, Poland, Slovakia, and Romania via the PORR Group's coordinated European footprint. Revenue is not publicly disclosed at the entity level; financials are consolidated within PORR Group reporting.

Name

Stump-Franki Spezialtiefbau

Legal name

Stump-Franki Spezialtiefbau GmbH

Website

https://stump-franki.de

Company type

Private

Founded year

2019

Operating status

Operating

Headcount range

501–1,000 employees

Short description

Stump-Franki Spezialtiefbau (now PORR Spezialtiefbau GmbH) is a Munich-based German specialized foundation engineering contractor within the PORR Group, delivering deep foundation, diaphragm wall, piling, and anchoring solutions for large-scale infrastructure and commercial construction projects across Europe.

Ownership category

akta.pro rank

Product category

Specialized Foundation Engineering Services

NAICS

Poured Concrete Foundation and Structure Contractors (23811)

SIC

Construction - Special Trade Contractors (1700)

akta.pro primary industry

Piling & Deep Foundations (Driven, Bored, CFA, Micropiles) (IMAFAOAA)

akta.pro secondary industry

Earth Retention & Excavation Support (Sheet/Soldier Piles, Diaphragm Walls, Bracing) (IMAFAOAD)

Keywords

• Specialized foundation engineering
• Deep foundation construction
• Diaphragm wall construction
• Ground anchoring systems
• Excavation pit engineering

Headquarters

HQ city

München

HQ country

Germany

HQ region

Europe

Offices3 records

Markets served

GTM type

B2B

Offering type

Services

Cost components

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

Revenue model

1. Specialist Foundation Engineering Services: Revenue generated from providing specialized deep foundation and civil engineering construction services including diaphragm walls, bored piles, driven piles, ground anchors, and complex excavation pit construction for infrastructure and building projects.

Go-to-market motion1 record

Distribution channels1 record

Marketing channels4 records

Core offering

Stump-Franki Spezialtiefbau (now PORR Spezialtiefbau GmbH) delivers specialized deep foundation and geotechnical construction services for large-scale infrastructure, high-rise, and building construction projects in Germany. Its offering covers diaphragm wall construction, bored and driven pile foundations (including the proprietary Frankipfahl, Duplex anchor, and Atlas pile systems), ground anchoring, and complete excavation pit construction with all trades performed in-house.

Product overview

Stump-Franki Spezialtiefbau (now PORR Spezialtiefbau GmbH) operates as a specialized foundation engineering company offering comprehensive deep foundation and geotechnical services. The company was formed in April 2019 through the merger of Stump Spezialtiefbau and FRANKI Grundbau, both long-established companies with roots dating back to 1908 and 1932 respectively. The product portfolio centers on specialized foundation technologies including the Frankipfahl (Frankipile), Duplex-Anker (Duplex Anchor), Atlaspfahl (Atlas Pile), and Schlitzwandtechnik (Diaphragm Wall Technology). Since January 2024, the company rebranded to PORR Spezialtiefbau GmbH, integrating as an independent service area within the PORR Group while maintaining its specialized foundation engineering expertise. The company offers all construction steps along the project value chain from design to execution for complex foundation and excavation projects.

Differentiator

Problem solved

Functional benefit

Products and services

• Frankipfahl (Frankipile) driven pile system Cast-in-place concrete driven pile foundation with an enlarged pile foot, providing load-bearing deep foundation for building and infrastructure projects; the proprietary system has been deployed for over a century across the Stump and FRANKI legacy businesses.
• Duplex-Anker (Duplex Anchor) ground anchoring system Specialized ground anchor system for retaining and stabilizing structures, used in excavation pits, slopes, and structural support applications; granted the first general building approval for such technology in Germany.
• Atlaspfahl (Atlas Pile) fully-displacing pile system Fully-displacing pile technology installed using specialized Atlas equipment, providing efficient deep foundations with reduced material consumption for building and infrastructure construction projects.
• Schlitzwandtechnik (Diaphragm Wall Technology) Diaphragm wall construction using slurry wall techniques, used for complex excavation pit construction and structural support in deep foundation projects.
• Complex excavation pit construction services Full-service construction of complex excavation pits, with all trades delivered in-house (earthworks, anchoring, dewatering, structural support), serving building, infrastructure, and urban development projects.

Segments1 record

Ideal customer profiles1 record

Technology focussed No

API detail

Has API

No

API docs

API detail

Core technology

AI maturity

App detail

Feature4 records

Partnerships

One partnership is on record.

• PORR GroupcoreStrategic or Co-development Partner · 1 April 2019Stump-Franki Spezialtiefbau GmbH was created in April 2019 through the merger of Stump Spezialtiefbau and FRANKI Grundbau, both subsidiaries of PORR Group. As of January 1, 2024, the company rebranded to PORR Spezialtiefbau GmbH, operating as an autonomous business unit within the PORR Group. The integration enables full-service project delivery along the entire construction value chain.

Scale indicators2 records

Recent moves5 records

Expansion highlights4 records

Others

• Fugro N.V. Dutch geotechnical services and site-investigation firm; comparable from a market and customer perspective as a supplier of geotechnical data and engineering services used alongside foundation construction, though operating upstream of contracting.

Direct peers

• Trevi S.p.A. Italian specialty foundation contractor providing deep foundations, ground improvement, and underground works across Europe, Africa, and the Americas; competes for the same large infrastructure tenders and applies comparable diaphragm wall and piling technologies.
• Bauer AG: German-headquartered global specialist foundation contractor (Bauer Spezialtiefbau) offering the full range of piling, diaphragm wall, ground anchoring, and soil-improvement techniques to the same customer segment of large infrastructure and high-rise developers.
• Rädlinger ZEMUS GmbH: German specialty foundation engineering contractor covering piling, ground improvement, and civil works; a regional direct peer competing for mid-sized foundation tenders in Germany.
• Keller Group plc: UK-listed global geotechnical contractor delivering piling, ground engineering, and ground improvement services; directly comparable to Stump-Franki/PORR Spezialtiefbau in proprietary techniques, project-based revenue, and capital-intensive fleet model.
• Implenia AG: Swiss-based construction and specialist foundation engineering group; a direct competitor in DACH markets for foundation piling, diaphragm walls, and tunneling, with similar integration across heavy civil and building construction.

Broad incumbents

• Bilfinger SE: German-listed industrial services and civil engineering group with foundation engineering capabilities and adjacent heavy-civil activities; an adjacent incumbent competing for selected infrastructure foundation scopes.
• Züblin AG (Stuttgart): German subsidiary of Strabag SE and a leading German foundation engineering contractor; directly competes with Stump-Franki/PORR Spezialtiefbau on infrastructure piling, ground anchors, and diaphragm walls across DACH.
• Strabag AG: Austrian-headquartered global construction group with in-house special foundation engineering capabilities; competes with PORR Spezialtiefbau on infrastructure tenders and operates at similar scale across DACH and CEE markets.

Regional players

• Neidhardt Grundbau GmbH: Independent German specialist in pile foundations, diaphragm walls, and ground anchoring; regional peer offering similar deep-foundation methods across northern Germany.

Market position

Strengths4 records

Weaknesses5 records

Competitive moat5 records

Key risks6 records

Key highlights6 records

Customer concentration

• Xxing.com/companies/porrdeutschlandgmbh
• YouTubeyoutube.com/@porrdeutschland
• Facebookfacebook.com/PORR-Deutschland-101546239162777
• LinkedInlinkedin.com/company/porr-deutschland
• Instagraminstagram.com/porr_deutschland

Revenue estimate

Valuation estimate

Number of profiles

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 Stump-Franki Spezialtiefbau