WindSail Capital Group

WindSail Capital Group, LLC is a private equity and venture capital firm based in Boston, Massachusetts, established in 2013. The firm specializes in providing growth capital to companies focused on energy innovation and sustainability across various industries. WindSail offers a range of financing solutions, including senior secured loans, junior secured loans, stretch loans, and bridge loans, primarily targeting U.S.-based businesses. With an investment strategy that emphasizes flexible financing options, WindSail aims to support companies that are either revenue-generating or in the early stages of commercial development. The firm typically invests equity ranging from $2 million to $8 million and debt from $2 million to $10 million, ensuring its portfolio companies have the necessary resources to facilitate growth while minimizing equity dilution.

Ian Bowles

Co-Founder and Managing Director

Andrew Chang

Vice President

Jessica Hart

Principal

Matthew O'Rourke

Vice President

Past deals in Boston, MA

Nanoramic Laboratories

Venture Round in 2024
Nanoramic Laboratories is a Boston-based company focused on developing advanced energy storage technologies and materials. It specializes in designing, manufacturing, and licensing Neocarbonix electrodes for rechargeable lithium-ion batteries, as well as producing FastCAP ultracapacitors, which utilize nanocarbon-based electrodes for enhanced performance. The company also offers Thermexit, a line of high-performance thermal interface gap filler pads. Originating from research funded by NASA, the Department of Energy, and the Department of Defense, Nanoramic's innovations aim to revolutionize industries such as electric vehicle batteries and consumer electronics. Established in 2008 and formerly known as FastCAP Systems Corporation, Nanoramic continues to expand its product offerings, which include ultracapacitors capable of operating in extreme temperatures and various energy storage solutions tailored to meet market demands.

WeSpire

Debt Financing in 2015
WeSpire Inc. is an engagement platform based in Boston, Massachusetts, that specializes in sustainability and corporate responsibility programs for global corporations. Founded in 2010, the company, formerly known as Practically Green, LLC, empowers organizations to engage their employees in impactful initiatives through persuasive technology. WeSpire's platform incorporates dynamic content, social levers, and gamification, utilizing applied behavioral science to drive participation and measure outcomes across various areas, including energy, water, waste, transportation, food, volunteerism, and corporate citizenship. The company collaborates with prominent brands such as Unilever, MGM Resorts International, and Sony to foster engagement in sustainability and well-being programs, helping organizations achieve measurable positive impacts.

Nanoramic Laboratories

Debt Financing in 2014
Nanoramic Laboratories is a Boston-based company focused on developing advanced energy storage technologies and materials. It specializes in designing, manufacturing, and licensing Neocarbonix electrodes for rechargeable lithium-ion batteries, as well as producing FastCAP ultracapacitors, which utilize nanocarbon-based electrodes for enhanced performance. The company also offers Thermexit, a line of high-performance thermal interface gap filler pads. Originating from research funded by NASA, the Department of Energy, and the Department of Defense, Nanoramic's innovations aim to revolutionize industries such as electric vehicle batteries and consumer electronics. Established in 2008 and formerly known as FastCAP Systems Corporation, Nanoramic continues to expand its product offerings, which include ultracapacitors capable of operating in extreme temperatures and various energy storage solutions tailored to meet market demands.
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