Gainline Capital Partners

Investor type

PE / VC

Founded

2015

AUM

$1 300 M

Location

Stamford, Connecticut, United States

Investment Ticket

$10-50 m

Investment Stage

Pre-seed Seed Series B Late Stage (Series C+)

Region of investment

North America
Investor profile last updated: 16 August, 2026

Profile

Gainline Capital Partners is a private equity firm based in Stamford, Connecticut, established in 2015. The firm was co-founded by Allan Weinstein and Rick Sullivan, both experienced professionals with a background in finance. Gainline Capital prides itself on its deep experience and hands-on approach, focusing on small goals to achieve overall value creation. The team is composed of managing partners, principals, vice presidents, and other professionals, all of whom contribute to a collaborative and successful work environment.

The firm primarily invests in businesses within the business services, consumer, and niche manufacturing sectors. Gainline targets North America-based middle-market platforms, typically making control-oriented investments in companies with $5-50 million in EBITDA. The firm's investment strategy emphasizes opportunities for professionalizing businesses and applying their value creation playbook. The investment size usually ranges from $5 million to $50 million.

Gainline Capital Partners has a diverse portfolio of companies, including ANA Global, IMS Technology Services, LLC, M&M International, Harvest Right, Atlantic Energy, Galaxy Universal, Core Health & Fitness, WellStat, Southern Furniture Industries, and Source Advisors. Each of these companies benefits from Gainline's focus on creating sustainable business models and achieving strategic growth.

Industry

Business Services (B2B) Consumer Products Consumer Services (B2C) Retail SaaS Technology Energy Manufacturing Software Transportation Logistics Sports/SportsTech

Gainline Capital Partners Funds

Name Type
Questionare
Industry
Questionare
Stage
Questionare
Region
Size AUM Launch date
Gainline Equity Fund I LP
Private Equity (PE)
Business Services (B2B)
Consumer Products
Consumer Services (B2C)
Retail
SaaS
Software
Transportation
Technology
Logistics
Series B
Late Stage (Series C+)
North America
$5-10 m
$155 M
May 2019
Gainline Equity Fund II LP
Private Equity (PE)
Business Services (B2B)
Consumer Products
Consumer Services (B2C)
Retail
SaaS
Software
Sports/SportsTech
Energy
Logistics
Series B
Late Stage (Series C+)
North America
$5-10 m
$400 M
July 2023

Contacts

Name
Title
Email
avatar
Rick Sullivan Managing Partner
Managing Partner
r•••@•••
avatar
Zach Greenspan Vice President
Vice President
z•••@•••
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Investment-team contacts for Gainline Capital Partners — including verified work emails and LinkedIn profiles — are available to Private Equity List subscribers.
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FAQs about Gainline Capital Partners

Gainline Capital Partners is a venture capital and private equity firm. It backs companies at Pre-seed, Seed, Series B and Late Stage (Series C+), writing tickets of $10-50 m.
Gainline Capital Partners is located in Stamford, Connecticut, United States.
Gainline Capital Partners was founded in 2015.
Gainline Capital Partners invests in companies and startups in Business Services (B2B), Consumer Products, Consumer Services (B2C), Retail, SaaS, Technology, Energy, Manufacturing, Software, Transportation, Logistics, Sports/SportsTech.
Gainline Capital Partners invests in companies and startups in North America.
Gainline Capital Partners invests in companies and startups at Pre-seed, Seed, Series B, Late Stage (Series C+).
Gainline Capital Partners usually invests $10-50 m on average.
Gainline Capital Partners has around $1 300m assets under management.
Gainline Capital Partners last fund was created/launched in 2023-07-10
Gainline Capital Partners can be reached through its website www.gainlinecapital.com and its LinkedIn page. Its general enquiries address is [email protected]. Cold-mailing a general inbox rarely reaches a partner, so Private Equity List also lists the investment-team contacts for Gainline Capital Partners — names, roles, verified work emails and LinkedIn profiles — available on a Pro plan from $129/month (see pricing). Contacts are sourced from the firm's website and LinkedIn and re-verified on a rolling cycle. Spot a stale contact, or none at all? Report it — we re-run that firm within 48h and get back to you.
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Private Equity List re-verifies investor profiles on a rolling cycle, pulling from the firm's own website and LinkedIn rather than a one-off import. This profile was last updated on 16 August, 2026. Something out of date here? Report it — we re-run that firm within 48h and get back to you.