Mainsail Partners
Growth equityAustin · Growth · 95 people tracked
Investment thesis
Mainsail Partners focuses on supporting bootstrapped founders building AI-powered vertical market leaders in B2B software. The firm partners with companies leveraging AI to capture significant market opportunities within specific verticals and sectors.
Source: firm website, verified Jul 21, 2026.
Team · 95 people
from the firm's website
What they invest in
from 2 of 59 portfolio companiesEnterprise Software ×2SaaS ×2E-commerce ×1Logistics & Supply Chain ×1
HQs:United States×1
Investments · 59 tracked
founders shown can be your intro pathExtensiv provides software for omnichannel fulfillment, enabling brands and third-party logistics (3PL) providers to coordinate warehouse operations and order management. The platform serves logistics professionals and e-commerce brands managing inventory and fulfillment across multiple channels.
E-commerceEnterprise SoftwareLogistics & Supply ChainSaaS
Fullbay is a software platform designed for heavy-duty truck and trailer repair shops to manage service operations, technician productivity, parts inventory, and invoicing. The platform serves diesel repair shop owners, technicians, service managers, and office staff to streamline workflows and improve profitability.
Enterprise SoftwareSaaS
Board seats · per SEC filings
what is this? ⓘRaise · filed Feb 2025 · via Vinay Kashyap
Inferred from directors named on each company's SEC Form D — public regulatory data, not a portfolio list published by the firm.
Frequently asked questions
- What stage does Mainsail Partners invest at?
- Mainsail Partners invests at the Growth stage.
- What is Mainsail Partners's typical check size?
- Mainsail Partners typically writes checks of $10M – $75M.
- What sectors does Mainsail Partners focus on?
- Mainsail Partners focuses on AI & Machine Learning, Cybersecurity, Enterprise Software, Fintech, Healthtech, SaaS.
- Where is Mainsail Partners located?
- Mainsail Partners is headquartered in Austin, US.
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