What The Middlesex Corporation does

The Middlesex Corporation is a privately held heavy civil construction contractor founded in 1972 and headquartered in Littleton, Massachusetts. The company delivers large-scale infrastructure projects across the U.S. East Coast from Maine to Florida through offices in Massachusetts, Connecticut, Orlando, and Tampa. Its core service portfolio spans bridges, highways and interchanges, rail/transit, aviation facilities, marine and federal defense infrastructure, and energy transmission and distribution, complemented by in-house asphalt manufacturing, aggregate production, ready-mix concrete supply, and an owned heavy equipment fleet. Middlesex pursues work through competitive public-sector procurement under bid-build, design-build, CM/GC, and joint venture delivery methods, serving state departments of transportation (CTDOT, MassDOT/MBTA, FDOT), federal agencies (Amtrak, NAVFAC), aviation authorities (GOAA, HCAA, Central Florida Expressway Authority), and private enterprises (Brightline, Eversource, Liberty Utilities).

The company's revenue model is project-based, with contracts ranging from approximately $260K utility-scale work to over $1B mega-project joint ventures, where Middlesex often serves as a JV partner alongside tier-one firms such as Cianbro, Fluor, Balfour Beatty Infrastructure, Tutor Perini, and The Industrial Company. Pricing is not publicly disclosed; contracts are awarded through competitive bidding against prequalified competitors and bonded through Middlesex's balance sheet. The company operates a wholly owned subsidiary, Middlesex Paving, LLC, to consolidate paving and asphalt services. Middlesex differentiates through vertically integrated materials supply, a 52-year track record, sustained recognition as a Top Workplace and safety award recipient, and award-winning execution on complex movable bridges, commuter rail expansions, and naval drydock construction.

Ownership is concentrated in the Pereira family, with Robert Pereira serving as Chairman and CEO. The company has no disclosed parent company, no private equity backing, and no public listing. As of 2024, Middlesex was ranked #203 on the ENR Top 400 Contractors list, employs between 501 and 1,000 people, and reports no AI/ML, software, or technology platform products beyond its construction services and materials operations.

Name

The Middlesex Corporation

Legal name

The Middlesex Corporation

Website

https://middlesexco.com

Company type

Private

Founded year

1972

Operating status

Operating

Headcount range

501–1,000 employees

Short description

The Middlesex Corporation is a privately held, family-owned heavy civil construction contractor founded in 1972, delivering bridges, highways, rail/transit, aviation, marine, and energy infrastructure projects for state DOTs, federal agencies, and private utilities across the U.S. East Coast from Maine to Florida.

Ownership category

akta.pro rank

Product category

Heavy Civil Construction

NAICS

Heavy and Civil Engineering Construction (237), Other Heavy and Civil Engineering Construction (237990)

SIC

Heavy Construction Other Than Bldg Const - Contractors (1600)

akta.pro primary industry

Public Works General Contracting (IMAFAAAG)

akta.pro secondary industry

Quay & Waterfront Civil Works (Piers, Quays, Seawalls, Dredging, Revetments) (IMAJALAF)

Keywords

• Heavy civil construction
• Bridge construction services
• Highway infrastructure contracting
• Rail transit construction
• Asphalt paving services

Headquarters

HQ city

Littleton

HQ country

United States

HQ region

North America

Offices4 records

Markets served

GTM type

B2B

Offering type

Services

Cost components

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

Revenue model

1. Heavy Civil Construction Contracts: The Middlesex Corporation generates revenue by winning and executing large-scale heavy civil infrastructure construction contracts. Revenue is project-based, generated through competitive bidding on public sector infrastructure projects including bridges, highways, rail/transit, aviation, and energy projects. The company operates as prime contractor, joint venture partner, or subcontractor on projects valued from under $1M to over $1B. Additional revenue comes from asphalt manufacturing and materials supply through subsidiary operations.

Go-to-market motion1 record

Distribution channels1 record

Marketing channels8 records

Core offering

The Middlesex Corporation is a heavy civil infrastructure construction contractor that builds bridges, highways, interchanges, rail/transit systems, aviation facilities, marine infrastructure (including drydocks), and energy transmission and distribution systems for government agencies and private utilities along the US East Coast from Maine to Florida. The company also operates vertically integrated materials businesses producing asphalt, aggregates, and ready-mix concrete, and runs a dedicated paving division through Middlesex Paving, LLC.

Product overview

The Middlesex Corporation is a heavy civil construction company founded in 1972, offering a comprehensive suite of infrastructure construction services. The company's core offerings include Heavy/Civil Infrastructure (bridges, highways, interchanges, aviation), Rail/Transit systems, Energy infrastructure (electrical transmission and gas distribution), Paving services with proprietary Asphalt Manufacturing and Aggregates capabilities, and Marine construction. The company operates from offices in Massachusetts, Connecticut, and Florida, serving state departments of transportation, transit authorities, federal agencies, and private utilities along the East Coast from Maine to Florida.

Differentiator

Problem solved

Functional benefit

Products and services

• Heavy/Civil Infrastructure Construction Core infrastructure construction services for bridges, highways, interchanges, and aviation facilities for state DOTs and federal agencies throughout the eastern United States. Includes complex joint-venture projects on aggressive schedules.
• Bridge Construction Construction and replacement of bascule, arch, beam, and steel deck arch bridges for state DOTs, transit authorities, and federal agencies, including movable bridge rehabilitation and major river crossings.
• Highways & Interchanges Construction Construction of highways, toll roads, interchanges, and roadway widening projects for state DOTs and expressway authorities, including FDOT Turnpike projects and limited-access toll highways.
• Rail/Transit Construction Commuter rail, intercity passenger rail, and transit infrastructure construction including track installation, station construction, rail bridges, catenary systems, and corridor expansion for MBTA, Amtrak, and Brightline.
• Aviation Infrastructure Construction Airport construction including runways, taxiways, aprons, air cargo facilities, terminal aprons, parking structures, and landside civil infrastructure for county and city aviation authorities managing major commercial airports.
• Energy Infrastructure Construction Electrical transmission and distribution construction including underground ductbank installation, HPFF cable systems, gas main installation and replacement, and high-voltage cable systems for electric and gas utilities.
• Paving Services Asphalt paving services including milling, resurfacing, and new construction of roadways, parking lots, and airport facilities, operated through Middlesex Paving, LLC with its own estimating and sales channels.
• Asphalt Manufacturing Proprietary asphalt manufacturing producing various mix designs including polymer-modified binders, supplying both internal paving operations and external customers via [email protected].
• Aggregates Supply Aggregate production and supply for construction projects, providing raw material inputs for paving, concrete, and heavy civil operations.
• Mass Ready Mix Concrete Ready-mix concrete supply for construction projects, operated as a separate business at massreadymix.com providing concrete material for internal and external construction use.

Quantifiable outcome

• Ranked #203 in ENR Top 400 Contractors list (2024)
• +2 more outcomes

Named customers11 records

Segments5 records

Ideal customer profiles5 records

Technology focussed No

API detail

Has API

No

API docs

API detail

Core technology

AI maturity

App detail

Partnerships

Five partnerships are on record, tiered flagship and core.

• The Industrial Company (TIC) and Cianbro CorporationflagshipStrategic or Co-development Partner · 1 January 2021Three-way joint venture on P-381 Multi-Mission Drydock #1 ($1.1B) at Portsmouth Naval Shipyard for NAVFAC. Middlesex is constructing two new drydocks (525' x 100' each) for U.S. Navy submarine repairs. Project started 2021, expected completion 2026, with peak workforce of 400.
• Hensel PhelpscoreImplementation/ SI/ Consulting Partner · 1 January 2015Worked as General Contractor to Construction Manager at Risk (CMAR) Hensel Phelps on Orlando International Airport South Airport APM Complex ($40M). Middlesex performed sitework including pond construction, storm water, erosion control, roads, bridges, and MSE walls under GMP 1B and GMP 4 contracts.
• Cianbro CorporationflagshipStrategic or Co-development Partner · 1 January 2010Joint venture partner with Cianbro Corporation on multiple major infrastructure projects including Niantic River Bridge Replacement ($118M, 2010-2014) for AMTRAK, and Walk Bridge Replacement ($1.5B, CM/GC) for CTDOT. The joint venture combines heavy/civil bridge and rail work capabilities. Cianbro is a 1,000+ employee construction firm headquartered in Pittsfield, Maine.
• Tutor Perini CorporationcoreStrategic or Co-development PartnerJoint venture partner on South Coast Rail Middleboro Secondary & New Bedford Main Line Commuter Rail Expansion Phase I ($404M). Middlesex is the lead JV partner on this MBTA project involving 25 miles of new trackway and four commuter rail stations.
• Fluor, Balfour Beatty Infrastructure, Inc., and Herzog Contracting GroupflagshipStrategic or Co-development PartnerJoint venture partners on the $1.1B Green Line Extension project for MBTA, extending the Green Line from Cambridge to Somerville and Medford. Middlesex supplied 55% of labor and 45% of equipment as a JV partner. The project included seven new stations and a vehicle maintenance facility.

Scale indicators21 records

Recent moves6 records

Expansion highlights5 records

Direct peers

• Tutor Perini Corporation: Tutor Perini is a publicly traded heavy civil and building contractor with comparable East Coast mega-project execution (e.g., South Coast Rail JV lead). Both firms compete for and jointly execute billion-dollar transportation and infrastructure contracts in similar geographies.
• Cianbro Corporation: Cianbro is a 1,000+ employee heavy civil contractor based in Pittsfield, Maine, with overlapping East Coast focus. The two firms are repeat JV partners (Walk Bridge, Niantic River, P-381 Drydock), indicating nearly identical customer base, project types, and geographic footprint.
• Granite Construction Incorporated: Granite is a publicly traded heavy civil contractor specializing in transportation infrastructure, including bridges, highways, rail, and airports. Comparable project types, similar transportation-agency customer base, and vertically integrated materials operations.
• Lane Construction Corporation: Lane Construction (subsidiary of Webuild Group) is a heavy civil contractor focused on highways, bridges, tunnels, and rail. Directly comparable to Middlesex in project types and customers (state DOTs, transit authorities), with similar geographic East Coast presence.
• Flatiron Construction: Flatiron Construction is a heavy civil contractor specializing in bridges, highways, airports, and rail. Subsidiary of HOCHTIEF, with comparable transportation infrastructure focus and similar public-sector customer profile as Middlesex.
• Walsh Group / Walsh Construction: Walsh Group is a large privately held construction firm with a heavy civil division executing transportation infrastructure projects. Comparable scale of mega-project execution and similar vertically integrated capabilities.
• Balfour Beatty Infrastructure Inc. Balfour Beatty Infrastructure is the US heavy civil arm of Balfour Beatty plc, directly comparable to Middlesex in rail, highway, and bridge construction. Repeated JV partner on Green Line Extension, indicating overlapping customer base and delivery methods.
• Herzog Contracting Group: Herzog Contracting Group is a privately held rail and heavy civil contractor with comparable rail/transit focus (e.g., Green Line Extension JV partner). Directly comparable in commuter rail, track installation, and rail bridge work.
• The Industrial Company (TIC): TIC (part of Kiewit) is a heavy industrial and civil contractor specializing in complex industrial and government projects. Repeat JV partner with Middlesex on P-381 Drydock, indicating comparable capability for large-scale federal infrastructure work.

Broad incumbents

• Skanska USA Civil: Skanska USA is a larger, internationally backed civil contractor with broad heavy infrastructure portfolio. Competes with Middlesex for large transportation and transit projects, though typically at a larger scale and broader geographic footprint.

Market position

Strengths5 records

Weaknesses3 records

Competitive moat5 records

Key risks6 records

Key highlights7 records

Customer concentration

• YouTubeyoutube.com/channel/UC4YcSdAQEo-rc7BNwjPnJ4w
• Facebookfacebook.com/middlesexco/?ref=bookmarks
• LinkedInlinkedin.com/company/the-middlesex-corporation
• Instagraminstagram.com/middlesexcorp/?hl=en

Revenue estimate

Valuation estimate

Number of profiles

Profiles4 records

Subsidiaries1 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 The Middlesex Corporation