What Ottostumm | Mogs does

Ottostumm | Mogs is a privately held B2B manufacturer of premium steel and architectural bronze window and door systems, founded in 2008 by Karl Otto Stumm. The company operates a dual-entity corporate structure: Italian-based OTTOSTUMM S.R.L. (Maserada sul Piave, Veneto, VAT IT04245540267) houses design and R&D offices, while Swiss-based Ottostumm SA (Stabio, Switzerland) operates production facilities. The firm employs approximately 36 people and serves architects, real estate developers, and general contractors who specify steel and bronze window systems for high-end residential, hospitality, cultural, and commercial projects worldwide, with documented installations including the Venice Biennale Central Pavilion, Hotel Britannique Curio Collection by Hilton, the De Castelli Showroom in Milan, and Masseria Cristalli in Puglia.\n\nThe product portfolio is organized around four primary system families: FerroFinestra (hot-rolled steel non-thermal-break and thermal-break windows including Stucco, W20, W40, W50 TB, W75 TB, D75 TB, T42 TB, WLS75 TB Lift&Slide, and W40 FIRE); BronzoFinestra (the FerroFinestra design expressed in proprietary extruded architectural bronze — B40, B75 TB, DB75 TB, BLS75 TB Lift&Slide); Mogs 2mm (ultra-slim 2mm steel profiles — M65 TB and MLS72 TB Lift&Slide); and the Neutra Minimal Sliding system. These are supplemented by the ah! sub-brand (ah!38, ah!60, ah!UM), Basic 50 and Basic 60 entry-level systems, CW50-1 TB and CW60-1 TB curtain walls, and Custom CPX TB bespoke solutions. The company is the only manufacturer retaining the original hot-rolling production technique from the late 1800s for Stucco, W20, and W40 series, while modern thermal-break lines integrate polyamide or polyurethane insulating cores. Systems are produced in six material variants — hot-rolled steel, cold-formed galvanized/pickled steel, AISI 316L marine-grade stainless steel, Cor-Ten weathering steel, color-coated steel, and architectural bronze — using hot-rolling, cold profiling, extrusion, and laser welding in Swiss high-precision facilities under AEnEC-certified energy management.\n\nRevenue is generated through project-based direct sales of hardware systems, with no public pricing disclosed; quotes are issued based on specifications, material choices, quantities, and finishing requirements. The go-to-market combines specification-driven direct sales support from Italian design offices with downstream execution through a structured international network of certified partner window fabricators (serramentisti) trained and certified at the company's workshop. Marketing is event-driven, anchored by participation in BAU Munich, Architect@Work across Milan, Paris, London, Rotterdam, Rome, Berlin, and Barcelona, SAIE Bari, and Batimat Paris, complemented by a global project portfolio, a restricted professional download area, and active LinkedIn, Instagram, Facebook, and Pinterest channels. The company holds five consecutive Archiproducts Design Awards (2021–2025) across multiple product lines and operates an internal laboratory for air permeability, wind load resistance, water tightness, opening cycles, shear testing, and salt spray corrosion testing.

Name

Ottostumm | Mogs

Legal name

OTTOSTUMM S.R.L.

Website

https://ottostumm-mogs.com

Company type

Private

Founded year

2008

Operating status

Operating

Headcount range

11–50 employees

Short description

Ottostumm | Mogs is a premium Italian-Swiss manufacturer of steel and architectural bronze window and door systems, serving architects, developers, and general contractors through certified fabrication partners across high-end residential, hospitality, and cultural projects worldwide.

Ownership category

akta.pro rank

Product category

Architectural Steel and Bronze Window Systems

NAICS

Metal Window and Door Manufacturing (332321)

SIC

Metal Doors, Sash, Frames, Moldings & Trim (3442)

akta.pro primary industry

Windows (IMADAIAC)

akta.pro secondary industries

Custom Window & Door Fabrication & Replacement (HSAPAJAI), Storefronts, Curtain Wall & Window Wall Systems (IMADAIAG)

Keywords

• Steel window systems
• Bronze window systems
• Thermal break windows
• Architectural window manufacturer
• Curtain wall systems

Headquarters

HQ city

Maserada sul Piave

HQ country

Italy

HQ region

Europe

Offices2 records

Markets served

GTM type

B2B

Offering type

Hardware or Manufacturing

Cost components

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

Revenue model

1. Steel and Bronze Window Systems: Direct sale of proprietary steel and architectural bronze window and door systems to architectural firms, developers, and through partner fabricator network. Revenue is project-based with order quantities determined by architectural specifications. Systems include FerroFinestra, BronzoFinestra, Mogs 2mm, and curtain wall solutions.

Go-to-market motion3 records

Distribution channels2 records

Marketing channels9 records

Core offering

Ottostumm | Mogs designs and manufactures proprietary steel and architectural bronze window, door, sliding, and curtain wall systems. Systems are produced using hot-rolling, cold profiling, extrusion, and laser welding in Swiss high-precision production facilities, then fabricated and installed through a certified international network of partner window fabricators (serramentisti). Architectural consultancy and technical assistance are provided free of charge from project inception through execution.

Product overview

Ottostumm | Mogs is a manufacturer of distinctive steel and architectural bronze window and door systems, founded in 2008, combining Swiss technology with Italian design. The product portfolio consists of four main system families: FerroFinestra (historic hot-rolled steel window systems, including Stucco, W20, W40, W50 TB, W75 TB, D75 TB, WLS75 TB Lift&Slide, and W40 FIRE variants), BronzoFinestra (the same elegant FerroFinestra design expressed in extruded architectural bronze — B40, B75 TB, DB75 TB, BLS75 TB Lift&Slide), Mogs 2mm (ultra-slim 2 mm steel profiles — M65 TB and MLS72 TB Lift&Slide), and Custom solutions. These are complemented by the Neutra Minimal Sliding system, the ah! sub-brand (ah!38, ah!60, ah!UM), Basic 50 and Basic 60 entry-level systems, FerroFinestra T42 TB, and CW50-1 TB and CW60-1 TB curtain wall systems. Systems are produced across six primary steel and bronze material types (hot-rolled steel, cold-formed galvanized/pickled steel, AISI 316L stainless steel, Cor-Ten steel, color-coated steel, and architectural bronze), manufactured in Swiss high-precision production facilities using hot rolling, extrusion, cold profiling, and laser welding. A comprehensive services layer covers technical assistance, architectural consultancy, R&D, training, testing and certification, and special sample production. The company operates design/R&D offices in Italy and production facilities in Switzerland, serving prestigious architectural projects worldwide.

Differentiator

Problem solved

Functional benefit

Brands

• FerroFinestra: Hot-rolled steel window and door system series inspired by 1920s architecture, available in multiple profile variants (Stucco, W20, W40, W50 TB, W75 TB, D75 TB, WLS75 TB Lift&Slide, T42 TB, W40 FIRE).
• BronzoFinestra
• Mogs 2mm
• Neutra Minimal Sliding
• Basic
• Curtain Walls (CW)
• Custom CPX TB
• ah!

Products and services

• FerroFinestra Stucco Nostalgic FerroFinestra sub-line recalling late 1800s-early 1900s design, featuring hot-rolled steel profiles with characteristic arrow-shaped profile design. The stucco (traditional glass-fixing material) is often replaced by a glass-stop while retaining evocative aesthetics suitable for interior partitions.
• FerroFinestra W20 Direct descendant of the English 'Universal Gamma' system; a complete line of hot-rolled steel profiles reinterpreting the historic 20th-century design in a modern key. Enables stylistic continuity between exterior envelope and interior design choices.
• FerroFinestra W40 Authentic reinterpretation of the elegant, clean style that marked architecture from the early 20th century onwards. Only system on the market to retain the original hot-rolling production technique introduced in the late 1800s. Features thick-section steel profiles for robustness, enabling large glazed areas with ultra-slim frames in all opening types. Winner of the Archiproducts Design Award 2025.
• FerroFinestra W50 TB Thermal-break version of the original FerroFinestra maintaining identical profiles and proportions of the FerroFinestra W40 series. Uses high-density polyurethane thermal break and accommodates high-performance insulating glass up to 38 mm, meeting international energy-efficiency standards and contemporary comfort requirements.
• FerroFinestra W75 TB Thermal-break system maintaining the elegant, clean design of the FerroFinestra family with exceptional thermal insulation. Features co-planar and overlapping aesthetics, efficient polyamide insulating core, and profile design accommodating the latest selective insulating glazing. Available in pickled steel, galvanized steel, stainless steel, and Cor-Ten steel. Archiproducts Design Award 2023 winner.
• FerroFinestra D75 TB Dedicated door series complementing and enriching the FerroFinestra W75 TB system, maintaining the formal cleanliness and simplicity of the family. With extremely reduced visual profile for its category, enables any door type including security and anti-panic doors in galvanized steel, stainless steel, or Cor-Ten steel.
• FerroFinestra WLS75 TB (Lift&Slide) Lift-and-slide system enabling large sliding glazed openings with minimalist design and excellent performance. The perimeter frame can be fully recessed into the wall for maximum formal cleanliness. Accommodates insulating or safety glass up to 51 mm thickness; panels up to 400 kg. Available in pickled, galvanized, stainless, and Cor-Ten steel.
• W40 FIRE Fire-rated steel door system capitalizing on steel's structural stability under fire conditions. With protection classes from E30 to E120 and EW30 to EW120, offers fire and smoke barrier solutions for residential, commercial, and institutional interiors. Maintains the original hot-rolling production method, with evocative and authentic design.
• BronzoFinestra B40 Complete window and door system sharing the elegant, evocative design of the FerroFinestra W40 series, expressed in prestigious architectural bronze. Architectural bronze is a living material subject to natural oxidation acquiring unique tonal variations over time. Ideal for restoration work and equally fascinating in contemporary architecture.
• BronzoFinestra B75 TB Noble, timeless metal system delivering maximum performance. With warm tones and artisanal finishes making each installation unique, the B75 TB series offers both co-planar and overlapping aesthetics. Features efficient polyamide insulating core and profile design accommodating latest selective insulating glazing for excellent energy performance. Archiproducts Design Award 2024 winner.
• BronzoFinestra DB75 TB Dedicated door system complementing the BronzoFinestra B75 TB family, executed in architectural bronze with same thermal-break performance and high-end aesthetics.
• BronzoFinestra BLS75 TB (Lift&Slide) Lift-and-slide variant of the BronzoFinestra family in architectural bronze, combining the prestige of the bronze material with large sliding openings and thermal-break performance.
• Mogs 2mm M65 TB Slim-profile steel window system with 2 mm steel thickness, achieving extremely reduced visual profile with maximum robustness. Features thermal-break technology with polyamide insulation. Available in galvanized steel, stainless steel, and Cor-Ten steel. Enables large openings with ultra-slim frames. Archiproducts Design Award 2022 winner.
• Mogs 2mm MLS72 TB (Lift&Slide) Lift-and-slide variant of the Mogs 2mm family, enabling large sliding openings with ultra-slim profiles and thermal-break performance in a 72 mm system.
• Basic 50 Entry-level steel window system in the Ottostumm | Mogs portfolio, providing accessible access to the company's steel window technology.
• Basic 60 Steel window system offering enhanced thermal performance compared to the Basic 50, as the 60 mm profile depth suggests increased insulation capacity.
• Custom CPX TB Bespoke custom steel window system designed and manufactured to architect-specific requirements, offering maximum design freedom within the Ottostumm | Mogs production capabilities.
• Neutra Minimal Sliding First minimal sliding system in steel, featuring incredibly reduced visible sections and fully recessed frame. Accommodates large glazed panes with high-performance glazing. Design and performance benchmark for minimal sliding windows and doors.
• FerroFinestra T42 TB Thermal-break FerroFinestra system in the 42 mm profile depth range, providing a mid-range option within the FerroFinestra family with thermal-break performance.
• Facciate CW50-1 TB Curtain wall system with 50 mm profile depth and thermal break, enabling large-scale facade applications with Ottostumm | Mogs steel framing technology.
• Facciate CW60-1 TB Curtain wall system with 60 mm profile depth and thermal break, providing enhanced thermal performance for large-scale facade applications.
• ah!38 Minimal sliding window system in the ah! series, with 38 mm frame depth, representing the most compact entry in Ottostumm | Mogs's minimal sliding portfolio.
• ah!60 Minimal sliding window system in the ah! series, with 60 mm frame depth, offering enhanced thermal performance compared to the ah!38 entry-level model.
• ah!UM Minimal sliding system in the ah! series designed for ultra-minimal configurations, representing the most advanced minimal sliding solution in the ah! sub-brand.
• Technical Assistance & Architectural Consultancy Technical support to architects and clients from project inception including feasibility checks, specification descriptions, local design requirement evaluations, and preliminary cost estimates. Coordinates with the most suitable window-partner network for project execution.
• Research and Development Internal R&D department continuously engaged in researching the most advanced solutions and most efficient accessories to guarantee perfect long-term functionality. Develops new-generation steel profiles combining the charm of historic steel windows with modern comfort requirements.
• Training Ongoing training programs at the Ottostumm | Mogs workshop dedicated to clients and partners to introduce company systems and latest product developments, plus dedicated sessions for technical and design deepening.
• Test and Certifications Windows and doors made with Ottostumm | Mogs steel and architectural bronze systems undergo all major international tests and certifications at leading testing bodies, covering resistance to weather (water, air, wind), anti-intrusion and safety, and robustness. Includes internal laboratory for air permeability, wind load resistance, water tightness, opening cycles, shear, and salt spray corrosion testing.
• Special Samples Workshop-laboratory service for developing and testing new products and solutions to achieve maximum performance and design levels. Produces mock-ups, samples, and models dedicated to each client's requirements and the specificity of the project to be implemented.

Quantifiable outcome

• Thermal conductivity approximately 3 times lower than aluminum, resulting in significantly reduced energy consumption for building climatization
• +2 more outcomes

Named customers8 records

Segments4 records

Ideal customer profiles3 records

Technology focussed No

API detail

Has API

No

API docs

API detail

Core technology

AI maturity

App detail

Feature8 records

Partnerships

Two partnerships are on record, tiered core.

• Swiss Energy Agency for the Economy (AEnEC)coreOthersSwiss facilities operate under supervision of AEnEC for continuous reduction of CO2 emissions and greenhouse gases, with annual certification of energy efficiency improvements. Electricity sourced exclusively from European hydroelectric power plants.
• Ottostumm SA (Swiss Entity)coreOthersSwiss subsidiary entity (Ottostumm SA, via Baragge 2, CH-6885 Stabio, Switzerland) co-titled with OTTOSTUMM SRL for data protection purposes under GDPR, indicating integrated Swiss-Italian corporate structure.

Scale indicators3 records

Recent moves6 records

Expansion highlights6 records

Broad incumbents

• Jansen AG: Swiss manufacturer of steel profile systems for windows, doors, and facades, with a much broader portfolio across standard and engineered profile families. Operates as a broader incumbent in the same architectural steel-systems space, serving glass/façade fabricators and contract glaziers rather than direct architectural specification.
• Aluprof SA: One of Europe's largest architectural aluminum systems manufacturers, offering window, door, sliding, and curtain-wall systems. A broad incumbent operating in adjacent categories (premium windows, curtain walls) at greater scale than Ottostumm | Mogs and not specialized in the steel/bronze heritage niche.
• Schüco International: Large German architectural systems provider for windows, doors, and façades, including steel-profile ranges for fire-rated and heritage applications. A broader incumbent offering overlapping capabilities across many materials and project types, but not specialized in the slim-steel/bronze heritage niche Ottostumm | Mogs serves.
• Reynaers Aluminium: Belgian global manufacturer of architectural aluminum window, door, sliding, and curtain-wall systems. A broader incumbent with overlapping end-use applications (premium residential, commercial, curtain wall) but differentiated material (aluminum vs. steel/bronze) and much larger scale.
• Forster Profilsysteme: Swiss manufacturer of steel and stainless-steel profile systems for windows, doors, and façades with strong positions in fire-rated and security applications. Comparable on steel profile technology, thermal-break innovation, and European project specification channels, though selling profiles to fabricators rather than finished specification products directly.

Direct peers

• Sky-Frame: Swiss premium manufacturer of frameless sliding window and façade systems. Directly comparable to Ottostumm | Mogs's minimal sliding and lift-and-slide ranges on product format, premium architectural specification, and target end-user, with overlap in the high-end residential and hospitality segments.
• Secco Sistemi: Italian manufacturer of profiled metal window and door systems in brass, stainless steel, and galvanized steel. A direct competitor sharing the same Italian/Swiss craftsmanship positioning, premium architectural specification channel, and overlapping product categories including thermal-break and bronze window/door ranges.
• Crittall Windows: The UK's iconic steel-window manufacturer, founded in 1889, producing steel windows and doors for heritage restoration and contemporary architecture. Directly comparable to Ottostumm | Mogs because both make steel-framed window systems targeting architectural specification, with overlapping positioning on slim profiles and historic aesthetic authenticity.
• Vitrocsa: Swiss specialist in ultra-minimal sliding window systems, competing directly with Ottostumm | Mogs's Neutra Minimal Sliding and ah! series for premium architectural specification in large glazed openings. Comparable on product category (minimal-frame sliding), target customer (luxury residential and boutique commercial architects), and Swiss precision-manufacturing positioning.

Emerging players

• Raico Bautechnik: German specialist in steel and aluminum curtain-wall, window, and façade systems with growing premium and sustainability positioning. Comparable to Ottostumm | Mogs's CW50-1 TB and CW60-1 TB curtain-wall offerings on product format, though smaller and more focused on façade engineering than heritage aesthetic differentiation.

Market position

Strengths5 records

Weaknesses5 records

Competitive moat5 records

Key risks6 records

Key highlights7 records

Customer concentration

• Facebookfacebook.com/mogs.steel
• LinkedInlinkedin.com/company/ottostumm-mogs
• Instagraminstagram.com/ottostumm_mogs
• Pinterestpinterest.it/ottostumm_mogs

Revenue estimate

Valuation estimate

Number of profiles

Profiles1 record

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 Ottostumm | Mogs