Jennmaar

What Jennmaar does

Jennmar is a vertically integrated Pittsburgh-based manufacturer and single-source provider of ground support, rock stabilization, ventilation, and related infrastructure products serving the mining, tunneling, civil construction, and renewable energy industries. Its core offerings include rock bolts, cable bolts, resin anchorage systems (J-LOK, Jennchem), steel structures, carbide cutting tools (XCAL TOOLS, XCAL INDUSTRIES), flat rolled steel processing (JM Steel), ventilation products, and contract labor services (Jennmar Services), supported by proprietary engineering design systems such as the patented Roof Instability Rating (RIR) and Stress, Geologic, and Support (SGS) methodologies across a portfolio of 230+ patents. The company manufactures through 80+ facilities globally — including 59 production sites across the United States, Australia, Canada, China, Indonesia, France, Poland, Sweden, and Mexico — and distributes complementary products such as Draeger gas monitoring devices under exclusive agreements.

Jennmar generates revenue predominantly through direct B2B sales of industrial hardware under quote-based pricing to enterprise customers in coal mining, hard rock mining, tunneling, civil infrastructure, OEM manufacturing, and renewable energy segments, supplemented by contract labor and professional services revenue through Jennmar Services (over 1,500 hourly employees). Its go-to-market relies on regional sales teams and direct engineering support bundled with supply agreements. Since 2020, the company has executed at least 11 acquisitions — including Weber Mining & Tunnelling (July 2025), Rohrig Heavy Equipment Maintenance (May 2025), Australian Steel & Wire (May 2024), Dumotech (June 2024), G&R Gas Services (June 2024), and DSI Tunneling (December 2023) — expanding its product portfolio, geographic footprint, and downstream service capabilities.

In 2024, the company consolidated Frank Calandra Inc. and Calandra Group holdings under Jennmar Holdings LLC, and in May 2024 secured $250 million in funding led by FalconPoint Partners. In June 2026, KPS Capital Partners (~$19.5B AUM) completed a majority equity investment, with founder Tony Calandra transitioning to a board role and Dave Webster (formerly CEO of CPM Holdings) appointed as the new CEO to lead the next phase of growth.

Name

Jennmaar

Legal name

Jennmar Holdings LLC

Website

https://www.jennmar.com

Company type

Private

Founded year

1965

Operating status

Operating

Headcount range

1,001–5,000 employees

Short description

Jennmar is a Pittsburgh-based, vertically integrated manufacturer of ground support products, steel, carbide tools, ventilation systems, and contract labor services for the global mining, tunneling, civil construction, and renewable energy industries, operating 80+ facilities across six continents.

Ownership category

akta.pro rank

Headquarters

HQ city

Pittsburgh

HQ country

United States

HQ region

North America

Offices41 records

Markets served

GTM type

B2B

Offering type

Hardware or Manufacturing

Cost components

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

Revenue model

1. Ground Support Products: Manufacturing and sale of rock bolts, cable bolts, beams, channels, trusses, and related ground support products for mining and tunneling applications.
2. Chemical Products: Sale of chemical roof support, rock stabilization, and ventilation sealing products including resins, grouts, foams, and sealants through Jennchem affiliate.
3. Steel Services: Flat rolled steel products including master coils, slit coils, blanks, beams, sheets, flat bars, panels, roll forming, fabrication, slitting, stamping, and tubing through JM Steel.
4. Carbide Cutting Tools:
5. Ventilation Products: Flexible ducting, fans, silencers, tubing, and ventilation control products for mining, tunneling, aviation, and industrial applications.
6. Contract Labor & Recruitment Services: Providing well-trained personnel to coal mining, oil & gas, construction, and industrial plant industries, plus trucking and site development services.
7. Civil Infrastructure Products: Arch systems, lattice girders, liner plates, lagging systems, rock bolts for civil construction, tunneling, and infrastructure rehabilitation projects.
8. Renewable Energy Products: Steel tubing for solar tracking systems, torque tubes for smart solar trackers manufactured at JM Steel facilities.

Go-to-market motion3 records

Distribution channels5 records

Marketing channels6 records

Core offering

Jennmar manufactures and sells a comprehensive range of complementary ground support products (rock bolts, cable bolts, beams, channels, trusses, resin systems, and steel structures), chemical roof support and rock stabilization products, steel service products, carbide cutting tools, and ventilation products for the mining, tunneling, civil construction, and renewable energy industries. The company also provides contract labor and staffing services through Jennmar Services, operates as a single-source provider with engineering support, and sells exclusive-distributed Draeger safety products.

Product overview

Jennmar is a single-source provider offering a comprehensive portfolio of infrastructure products and services for mining, tunneling, civil construction, renewable energy, and industrial sectors. The core offerings center on ground support products (bolts, beams, channels, trusses, resins, rebar) manufactured across 20+ US facilities, supplemented by affiliated brands including Jennmar Engineering (geotechnical services and R&D), Jennmar Civil (tunneling and civil infrastructure products), Jennchem (chemical roof support and rock stabilization), JM Steel (flat rolled steel processing and fabrication), Jennmar Services (contract labor and staffing), XCAL TOOLS (carbide cutting and wear parts), XCAL INDUSTRIES (tungsten carbide blanks), and Jennmar Automation (custom automation systems). Following the 2025 acquisition of Weber Mining & Tunnelling, the portfolio expanded to include European-manufactured resins and foams for strata stabilization. The company also holds joint ventures in ventilation products (Turnstone), resin capsules (ROCBOLT), and drilling services (Falcon Drilling). Products are distributed through strategically located manufacturing facilities and warehouses across the US and internationally in Australia, Canada, Indonesia, Malaysia, Mongolia, Sweden, and China.

Differentiator

Problem solved

Functional benefit

Brands

• Jennchem: Chemical roof support, rock stabilization, and ventilation sealing products
• JM Steel
• Jennmar Civil
• Jennmar Services
• XCAL TOOLS
• XCAL INDUSTRIES
• Weber Mining & Tunnelling
• J-LOK
• Turnstone Industrial Solutions
• ROCBOLT

Products and services

• Mining Ground Support Products
• Soft Rock Support Products
• Chemicals, Cements, Grouts and Resins
• Civil and Infrastructure Products
• Steel Structure Products
• Carbide Cutting Tools
• Ventilation Products
• Solar and Renewable Energy Products
• Steel Service Products
• Jennmar Engineering Services
• Jennmar Automation Services
• Recruitment Solutions and Contract Labor
• Draeger Safety Products Distribution

Segments8 records

Ideal customer profiles5 records

Technology focussed No

API detail

Has API

No

API docs

API detail

Core technology

AI maturity

App detail

Feature6 records

Partnerships

Eight partnerships are on record, tiered minor, flagship and core.

• NextrackerminorStrategic or Co-development Partner · 1 January 2022Solar tube manufacturing partnership for solar tracker systems. JM Steel produces torque tubes and related products for Nextracker solar installations.
• KomatsuflagshipStrategic or Co-development Partner · 1 January 2021Jennmar and Komatsu announced a development agreement for pumpable resin solutions for underground hard rock mining drilling and bolting customers. The partnership leverages Komatsu's equipment expertise with Jennmar's chemical and resin capabilities.
• ABC Technology Group USAcoreStrategic or Co-development Partner · 1 January 2018Joint venture partner in Turnstone Industrial Solutions, LLC. ABC Technology Group's vertically-integrated manufacturing experience of high-quality ventilation products combined with Jennmar's sales and service network provides comprehensive ventilation solutions in the USA.
• Falcon Drilling CompanyminorStrategic or Co-development Partner · 1 January 2018Joint venture partner in Falcon Drilling, LLC, a Marcellus and Utica shale drilling contractor with operations in Pennsylvania, West Virginia, and Ohio. Board led by Tony Calandra and Don Donahue.
• JENNCHEM / Quaker ChemicalminorChannel Partner/ Reseller/ Distributor · 1 January 2018Exclusive distribution agreement between JENNCHEM and Quaker Chemical for chemical products in mining and tunneling applications.
• Murray EnergyminorChannel Partner/ Reseller/ Distributor · 1 January 2018Distribution agreement with Murray Energy for mining equipment and products in the coal mining industry.
• DSI UndergroundcoreStrategic or Co-development Partner · 1 January 2014Joint venture partner in ROCBOLT Resins (Australia) and ROCBOLT Technologies (South Africa, China, Mongolia) supplying resin capsules and ground support products to mining and tunneling markets.
• DraegercoreChannel Partner/ Reseller/ DistributorJennmar is the exclusive distributor for Draeger's gas monitoring devices for the US mining and tunneling industries. Jennmar's regional sales representatives provide sales and support for Draeger products including the X-am series monitors, thermal imaging cameras, and closed circuit breathing apparatus.

Scale indicators7 records

Recent moves7 records

Expansion highlights5 records

Broad incumbents

• Master Builders Solutions (BASF): Master Builders Solutions, part of BASF, provides chemical solutions for construction and mining including underground construction chemicals, resins, and ground support systems — directly competitive with Jennchem's chemical product portfolio.
• Sandvik Mining and Rock Solutions: Sandvik's mining division is a broad incumbent offering equipment, tools, and ground support solutions for mining and rock excavation. While Sandvik's portfolio is much broader than Jennmar's, it competes in mining consumables, rock tools, and underground equipment.
• Boart Longyear: Boart Longyear is a global provider of drilling services, equipment, and performance tooling for the mining industry. Its drilling consumables and tooling compete with Jennmar's carbide cutting tools and drilling products under XCAL TOOLS and XCAL INDUSTRIES.
• Atlas Copco: Atlas Copco is a broad industrial incumbent with significant mining and construction equipment presence, including compressors, tools, and assembly solutions. While primarily equipment-focused, it competes with Jennmar in mining-related consumables and tooling.
• Epiroc: Epiroc is a major broad incumbent in mining and infrastructure equipment, including rock drilling tools, ground support systems, and underground equipment. It competes with Jennmar across mining consumables and equipment categories globally.
• FLSmidth: FLSmidth is a broad incumbent in mining and cement industries, supplying equipment, consumables, and digital solutions. Its mining consumables portfolio overlaps with Jennmar's ground support, cutting tools, and mining services offerings.
• Orica: Orica is the world's largest provider of commercial explosives and blasting systems to mining and infrastructure markets, with expanding ground support offerings. Jennmar COO Michael Portwood was previously GM of Global Projects at Orica, highlighting overlap in mining chemicals and ground support.
• Komatsu Mining: Komatsu's mining division manufactures underground hard rock mining equipment, including drill rigs and bolters. Komatsu is a Jennmar strategic co-development partner (pumpable resin solutions) and competes in the integrated mining equipment and consumables market.

Direct peers

• DSI Underground: DSI Underground is a global competitor in ground support products (bolts, anchors, resin capsules) for mining and tunneling. DSI is both a Jennmar joint venture partner (ROCBOLT Resins in Australia/SE Asia) and a direct competitor in overlapping product categories and geographies.
• Minova: Minova is a direct competitor in ground support products including rock bolts, resin capsules, and chemical anchoring systems for mining and tunneling. Jennmar COO Michael Portwood was previously President of Minova, illustrating the close competition between the two companies in ground support solutions.

Market position

Strengths5 records

Weaknesses5 records

Competitive moat5 records

Key risks5 records

Key highlights7 records

Customer concentration

• Facebookfacebook.com/JennmarGroundControl
• LinkedInlinkedin.com/company/jennmar-corporation

Compliance3 records

Revenue estimate

Valuation estimate

Number of profiles

Profiles10 records

Subsidiaries18 records

Funding overview

Funding rounds1 record

Investors1 record

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

M&A8 records

Investments

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

Frequently asked questions about Jennmaar