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The Venture Codex

Mainsail Partners

One Front Street, Suite 3000, San Francisco, CA, 94111, United States

Overview

Mainsail Partners is a private equity firm that invests exclusively in profitable, growing companies in the United States and Canada. The firm works in partnership with management to build our portfolio companies into market leaders. Drawing on our network and expertise in operations, strategy, and finance, Mainsail represents a uniquely attractive partner to help shareholders and management teams build value in their businesses.

Total investments
31
Lead investments
29
Investments · 12mo
4
Active investors
11

Sector focus

  • Enterprise Software
  • Financial Services
  • Venture Capital
  • Wellness
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Investment portfolio

  • Steelhead Technologies

    Led · Equity · Dec 2025

    Founded in 2021, Steelhead Technologies offers an enterprise resource planning (ERP) software platform tailored to finishers and fabricators. The cloud solution digitizes the shop floor and unifies quoting, inventory, production, quality, and accounting into a single system. A configurable workflow engine allows customers to model specific processes such as stamping, plating, anodizing, heat treating, welding, bending, assembling, powder coating, and painting. More than 1.6 billion parts have been processed through the platform, and customer revenue trends suggest a 17% annual growth rate. Led by CEO Jeff Halonen, the company plans to use new capital to broaden its platform’s capabilities and roll out additional AI-driven tools aimed at boosting efficiency and profitability for its users. Headquartered in Calumet, Michigan, Steelhead focuses exclusively on the manufacturing and metal finishing sectors.

  • FieldFlo

    Led · Equity · Oct 2025

    FieldFlo offers a mobile-first, cloud platform that digitizes subcontractors’ critical workflows, including time tracking, certifications, incident reporting, and inventory management. Designed by former abatement and demolition professionals, the software serves as both a system of record and a risk-management tool, helping contractors remain compliant with OSHA, EPA, and state regulations while reducing on-site incidents and insurance claims. Users praise the product’s intuitive interface, configurability, and industry-specific workflows. Recent product extensions include Safety Academy, a centralized training and certification module, and FLŌTime, an enhanced digital timesheet that verifies on-site labor compliance. Backed by fresh growth capital, the company plans to accelerate product innovation, broaden its platform functionality, and scale its team to support a growing North American customer base. No revenue or user metrics were disclosed in the article.

  • CourtReserve

    Led · Equity · Oct 2025

    Founded in 2016 by Tim Owens and Ashley Owens, CourtReserve offers an end-to-end software platform that handles court scheduling, memberships, payments and mobile engagement for racquet and paddle sports clubs. The St. Augustine, FL company positions its solution as an operational backbone that allows facilities to scale while improving member experience. More than 2,000 clubs and 5 million players currently use the platform, highlighting meaningful traction in a fragmented market. Revenue figures were not disclosed, but the company’s adoption metrics suggest a sizeable, engaged user base. With fresh capital, CourtReserve plans to accelerate product development, deepen third-party integrations, and bolster customer support. The firm also aims to expand its footprint to additional sports facilities across North America. These initiatives are designed to maintain growth momentum and strengthen its community-centric value proposition.

  • Flyntlok

    Led · Equity · Oct 2025

    Based in Anchorage, Alaska, Flyntlok offers a vertical SaaS dealer-management platform purpose-built for heavy equipment, heavy and medium-duty truck, and outdoor power equipment dealers. The software streamlines point-of-sale, purchase and work orders, rentals, transportation scheduling, fleet and inventory planning, and integrates in real time with QuickBooks and Sage Intacct for accounting functions. Founder and CEO Sean McLaughlin originally built the system inside his own dealership, Craig Taylor Equipment, using it to scale that business from $20 million to more than $105 million in revenue over 11 years. Today, Flyntlok supports dealers across hundreds of locations and emphasizes a “dealer-first” approach with deep OEM integrations and high-touch customer support. With fresh capital, the company plans to roll out new AI-driven features through the resources of Mainsail AI Labs, helping dealers surface sales opportunities, automate repetitive tasks and uncover revenue hidden in their data. Flyntlok will also expand its customer success program to maintain the hands-on guidance that distinguishes the brand. The company intends to showcase emerging AI capabilities at the Equip Exposition in October.

  • ChiroHD

    Led · Equity · May 2025

    ChiroHD is a Marietta, GA–based provider of practice management software for chiropractic clinics. The platform offers scheduling, texting, insurance management, integrated financials and care management features and runs in any browser on any device with no installation or on-site server updates. Its Patient App supports scheduling and check-in, patient engagement, x-ray viewing and family check-in. Team-facing features include text appointment reminders, drag-and-drop and bulk scheduling, patient app check-in and real-time appointment status. Led by CEO Gabriel Doty and CTO Luke Doty, the company plans to use the new funding to expand operations and grow its business reach. No revenue or user metrics were disclosed in the article.

Team