“In wisdom gathered over time I have found that every experience is a form of exploration.” - Ansel Adams





Mark Blaxill
Executive Director

Mark Blaxill is co-founder and Executive Director of XLP Capital, a firm founded in 2015 and focused on technology strategy development, new technology business incubation and technology-based investments. Before starting XLP, Mr. Blaxill was a co-Founder and Managing Partner of 3LP Advisors, a firm focused on IP strategy development, patent transactions and IP-based investments. Previous to launching the launch of 3LP in 2008, he was a 25-year veteran of the Boston Consulting Group, where as senior vice president and partner, he headed the firm's Strategy Practice and recruited BCG’s core IP Strategy team. In this role, he launched the firm's Intellectual Property practice, developed proprietary tools for technology analysis, and co-authored BCG's first patent application.

He is the co-author of The Invisible Edge: Taking Your Strategy to the Next Level Using Intellectual Property (Portfolio, 2009), which was named Best Strategy Book in 2009 by a leading business journal. He has been named one of “The World’s Leading IP Strategists” by IAM Magazine. Mark credits that honor to the unique integration (developed over a decade and a half at BCG, 3LP and XLP) of the quantitative analyses of technology, patents, business and financial performance. One of his clients said something that made him proud: “a lot of companies can analyze your business and technology strategy. But what [you] can do, that’s a thing of beauty.”

Mr. Blaxill earned an M.B.A. with distinction from Harvard Business School and an A.B. from Princeton University's Woodrow Wilson School of Public and International Affairs, where he graduated summa cum laude and Phi Beta Kappa. None of this is especially important, but he did work very hard to succeed when he was younger.

Mark has two children, including a daughter diagnosed with autism and has been prominently involved in autism advocacy work, including efforts to quantify time trends in autism and chronic childhood illness and to assess the impact of a range of environmental factors. He writes often on autism, science and public policy issues and has published a number of articles, letters and commentaries on autism in scientific journals. He has testified before the Immunization Safety Review of the Institute of Medicine (2001), served on a Blue Ribbon Panel on Vaccine Safety (2004), initiated a symposium sponsored by the National Institute of Environmental Health Sciences entitled “Environmental Factors in Neurodevelopmental Disorders” (2005) and a workshop sponsored by the Institute of Medicine entitled “Autism and the Environment: Challenges and Opportunities for Research” (2007). He was a panelist at a “Meeting on Evaluating Reasons for ASD Trends” co-sponsored by the Centers for Disease Control and Autism Speaks (2011) and at a hearing “1 in 88 Children: A Look Into the Federal Response to Rising Rates of Autism” called by the House of Representatives’ Oversight and Government Reform Committee (2012). Recently divorced, he now divides his time between New York, Boston and Minneapolis.


Matt Stack
Managing Director

Matt Stack is a founder of XLP Capital, the founding manager of the Lambda Prime Investment Incubator Fund, and the Chief Investment Officer of XLP’s technology activist fund, Devonshire Capital Fund I. He is an experienced early and seed stage investor in high tech hardware and analytics companies with over $200M in completed deals, and serves as a technology advisor to a variety of institutions and family offices overseeing and directing over $500M. Over the past decade, Matt has acquired and developed a collection of minority interests in companies across North America ranging from small university spin outs to mid-sized industrial technology companies. Matt serves as an advisor to a number of privately held companies, where he manages and supervises technology and high performance computing investments. Matt has served as the Director of Computational Science at Mars Corporation and as a Partner at 3LP – a Boston-based elite Intellectual Property advisory firm.

Matt’s prior experiences include managing acquisitions for a $120M corporate-led technology buyout fund in Palo Alto, as well as spending 6 years at The Boston Consulting Group in the Boston and New York offices, where he worked on projects in the Health Care, IT, Retail, Industrial Goods, and Strategy practice areas. He frequently helped corporate clients with topics including corporate growth strategy, merger and acquisitions, and post-merger integration. Before BCG, Matt co-founded and invested in a health care software startup, a small electronics company, an advanced composites design firm, and a semiconductor distribution company that traded high performance semiconductor chips between Shenzhen, Tokyo, and Tecate.

Matt holds a B.S.E. in electrical engineering from Princeton University. He is a benefactor and sponsor of the TEDx conference series, and has sponsored research at the Santa Fe Institute in New Mexico, the Strategy Institute in New York, MIT’s Broad Institute, the Highlands Forum, the University of Oxford, and the Department of Defense. He is an accomplished computer hacker and cryptanalyst, and has written and advised on state-run network cyber-warfare policy, and agility-based strategic combat. Matt was recognized in 2009 by Hackaday as one of the top 10 most influential hardware hackers, and has been featured in Wired Magazine and the Wall Street Journal for his hobby electronics projects. He is the author of 11 neuroscience patents covering devices, analytical methods, and algorithms for detecting concussion and improving cognitive performance. In his spare time, he has been an Olympic hopeful in javelin, a competitive speedskater, a motorcycle collector, and is currently a professional windsurfer.




XLP Capital is a family office and as such is not required to be registered as an investment adviser with the U.S. Securities and Exchange Commission. Investments are made available only to accredited, qualified, or institutional investors that are eligible as family office clients, pursuant to the rules of the U.S. Investment Advisors Act of 1940. XLP does not seek or solicit investment for these funds or any other funds, and nothing on this page should constitute a solicitation for investment. The descriptions on this page is provided for information value only, as examples of prior investment related work XLP has conducted. XLP Capital assumes no liability for investment losses direct and indirectly resulting from recommendations made, implied, or inferred by its research. Likewise, XLP Capital assumes no claim to investment gains direct or indirectly resulting from trading profits, investment management or advisory fees obtained by following investment recommendations made, implied, or inferred by its research. Investment involves risk, and all investments should be made with the supervision of a professional investment manager or advisor. The materials on the Website are not an offer to sell or a solicitation of an offer to buy any investment, security or commodity, nor shall any security be offered or sold to any person, in any jurisdiction in which such offer would be unlawful under the securities laws of such jurisdiction.