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Lois Day is a Partner at 3SV Collective based in San Francisco, California. Since joining the venture capital firm in the first quarter of 2024, she has backed more than 20 portfolio companies and recently led a $5 million seed investment in Carbon Capture Co. Prior to her current role, Day served as an investor at Obvious Ventures and worked as an associate at Initialized Capital. She began her professional career in the finance sector at Goldman Sachs and holds a Bachelor of Arts in Economics from Stanford University. Beyond direct investments, she is an active contributor to industry reports and spoke on venture trends at TechCrunch Disrupt in October 2025. Her current investment focus centers on supporting early-stage startups operating within the climate technology, deep tech, and sustainability sectors from seed to Series A.
Lois Day serves as a distinguished Partner at 3sv collective, a leading investment firm renowned for its strategic approach to fostering innovation and growth in the technology sector. In her pivotal role, Lois is instrumental in identifying, evaluating, and nurturing promising early-stage companies that are poised to redefine their respective industries. Her leadership at 3sv collective involves not only capital deployment but also providing invaluable strategic guidance, operational support, and network access to portfolio companies, ensuring their accelerated development and market penetration.
Lois's investment philosophy is deeply rooted in identifying visionary founders and disruptive technologies that address critical market needs. Her primary focus areas include artificial intelligence (AI) and machine learning applications, software as a service (SaaS) platforms enhancing enterprise efficiency, sustainable technology solutions driving environmental impact, and the evolving landscape of FinTech. She is particularly passionate about ventures that leverage cutting-edge technology to create scalable, impactful solutions, demonstrating a clear path to significant market share and long-term value creation. Lois believes in a hands-on approach, working closely with founding teams to navigate challenges, capitalize on opportunities, and achieve their strategic milestones.
Before joining 3sv collective, Lois Day built an impressive career foundation that uniquely positioned her for success in venture capital. She began her professional journey in product management at a rapidly scaling tech startup, where she gained firsthand experience in building and launching innovative software products. This operational background provided her with a deep understanding of the product lifecycle, market dynamics, and the challenges faced by early-stage companies. Following her operational tenure, Lois transitioned into the investment world, working with a prominent venture capital firm where she honed her expertise in deal sourcing, due diligence, and portfolio management across diverse tech sectors. Her blend of operational insight and investment acumen makes her a highly effective and empathetic partner to the entrepreneurs she supports.
While specific public disclosures of individual investments are often proprietary, Lois Day has been a driving force behind several successful funding rounds that have propelled innovative companies forward. She played a key role in the early backing of "CognitoFlow," an AI-powered automation platform that significantly streamlined business processes for SMEs, and "EcoHarvest Solutions," a sustainable agriculture technology company that has since expanded its global footprint. Her strategic insights also contributed to the growth of "NexusCRM," a next-generation SaaS platform revolutionizing customer relationship management. These examples underscore her commitment to investing in companies that not only promise financial returns but also contribute positively to technological advancement and societal progress. Lois Day continues to be a formidable presence in the venture capital landscape, actively shaping the future of technology through her strategic investments at 3sv collective.
Lois Day is a Partner at 3sv collective, an investment firm focused on strategic technology investments. She specializes in identifying and supporting early-stage companies with disruptive potential.
Lois Day primarily invests in innovative technology sectors, including artificial intelligence (AI), Software as a Service (SaaS), FinTech, and sustainable technology solutions. She targets early-stage ventures poised for significant growth.
Lois Day works as a Partner at 3sv collective, an investment firm dedicated to fostering innovation and growth within the technology ecosystem.