Oak Investment Partners

A group of four managing partners — Bandel Carano, Ed Glassmeyer, Fred Harman, and Ann Lamont — lead all investment decisions. The firm's 10-person investment team operates as a flat partnership without a formal CEO. Each managing partner has been with Oak for multiple decades, creating continuity in underwriting and portfolio-company engagement.

Oak is structured as a traditional multistage venture capital firm, not a family office. It raises institutional capital and has deployed $9 billion since 1978 across over 525 companies. The firm does not manage a single pool of family wealth.

Oak invests across the full company lifecycle — from seed and early-stage startups through growth equity and public-company PIPEs. The firm also executes spinouts of operating divisions and technology assets. This flexibility allows it to follow winning companies through multiple financing rounds.

Oak's sourcing advantage comes from a four-decade affiliate network of roughly 250 senior executives who span industries and geographies. These operators surface opportunities through their own professional networks and commercial relationships. The firm also benefits from repeat founder partnerships, with portfolio CEOs like Kayak's Steve Hafner and Castlight Health's Gio Colella publicly endorsing Oak's long-term support.

Oak deploys capital through direct investments rather than acting as a fund-of-funds. The firm takes board seats and embeds its executive network into portfolio companies. There is no public record of Oak committing capital to other venture funds as a limited partner.

Oak's published focus is on Information Technology, Internet and Consumer, Financial Services Technology, Healthcare Information and Services, and Clean Energy. The firm does not invest in sectors outside this remit, such as hard industrial manufacturing, defense, or resource extraction.

The firm is headquartered in Wilton, Connecticut, with an additional office in Menlo Park, California. While Oak has backed international portfolio companies, it does not publicly list investment offices outside the United States.