Mark Friday

Mark Friday runs venture investing at Cathexis Ventures, the venture-capital arm of Cathexis Holdings LP — the Houston-based single-family office of billionaire William "Bill" Harrison (founder of the point-of-sale and payments group). He is based in Houston and has been the public face of the firm's startup investing since it formalized its process, appearing on his LinkedIn and aggregator profiles first as an "Associate" leading venture investments and, more recently, as a Managing Director.

Friday's background is technical rather than purely financial. He holds a B.S. in Electrical Engineering & Economics from Texas Christian University (2005–2009), and multiple profiles cite earlier engineering-oriented experience at Lockheed Martin Aeronautics, Bell Helicopter and Hatch before he moved into investing at Cathexis. He frequently frames this engineering training as an edge in evaluating hardware, deeptech and other technically complex startups on their technological foundations as well as their financials.

Under Friday, Cathexis Ventures formalized its investment activity in early 2018 and has since backed 90-plus companies (the firm cites "over 100"). It describes itself as a group of "generalist investors in the best teams building great products quickly and efficiently," and — because the capital comes from a family office rather than outside LPs — it can be flexible on timeline and follow-on support. Friday is active in the Houston innovation community, writing founder-education pieces for InnovationMap (on pitch decks and recommended reading) and appearing on the Oil & Gas Startups / Digital Wildcatters podcast to discuss investing.

• Stage & check: Leads and participates in Pre-Seed and Seed rounds with $250K–$1M initial checks, and can scale within the same round into the millions (up to ~$10M) — useful for founders who want one investor able to grow with the round.
• Generalist by design: Sector-agnostic, with a portfolio skewed toward SaaS (~60%) and hardware/deeptech (~30%), plus consumer. Stated personal interests include PropTech, EnergyTech, Consumer Internet, Fintech, Health, Robotics/AI, and Logistics/Marketplaces.
• Team and efficiency first: The firm bets on "the best teams building great products quickly and efficiently," prizing capital efficiency and execution speed over polish.
• Founder-centric capital: Cathexis frames its differentiation as investing "mental and emotional energy into founders," not just money — reflecting its patient, family-office backing.
• Global reach: Comfortable investing well outside the US — roughly 30% of the portfolio is international, with heavy exposure to LATAM (Baubap, Yummy, Paycaddy, Houm) and India (Decentro, Redcliffe, SalaryBox, Legistify).
• In his own words on getting the meeting: "The investor pitch deck doesn't get you the investment — the deck gets you the meeting." He urges founders to boil the story down: "Work on that elevator pitch and work on that short pitch deck."