Hart Callahan Named One Of GrowthCap’s Top 40 Under 40 Growth Investors of 2025

NewSpring General Partner Hart Callahan has been named to GrowthCap’s Top 40 Under 40 Growth Investors of 2025, an annual recognition highlighting the next generation of leaders shaping the growth investing landscape.

“I’m honored to be recognized as part of the 2025 Top 40 Under 40 Growth Investors. This award reflects the incredible founders, management teams, and colleagues I’ve had the privilege to partner with, and the collaborative work we do every day to help build enduring, high-growth companies.” — Hart Callahan

Now in its twelfth year, the Top 40 Under 40 awards reflect the depth of talent driving the future of growth equity. Throughout 2025, investors operated with a disciplined mindset, balancing the implications of artificial intelligence adoption alongside evolving market dynamics. Those recognized this year stood out for their focus on strong fundamentals, operational excellence, and long-term value creation.

Hart’s selection reflects his ability to navigate complexity, partner meaningfully with management teams, and drive durable success across his portfolio. His work exemplifies the qualities GrowthCap seeks to recognize, including thoughtful investment judgment, collaborative leadership, and a commitment to building enduring growth companies.

Honorees represent a broad cross-section of the growth investing ecosystem, from repeat recipients who continue to raise the bar to first-time awardees making a significant impact. Hart was selected through a highly competitive evaluation process drawing on proprietary research, nomination submissions, and feedback from peers, colleagues, and portfolio company leaders.

Hart Callahan is a General Partner at NewSpring, focused on the firm’s dedicated growth equity strategy. Since joining NewSpring in 2014, he has advanced through the ranks from Analyst to Partner, leading and supporting investments in high-growth SaaS and enterprise software companies.

Over more than a decade at the firm, Hart has partnered with founders and management teams to accelerate revenue growth, refine go-to-market strategies, expand into new markets, and drive successful exits. He is recognized for identifying proprietary opportunities, structuring flexible growth solutions, and guiding companies through complex transactions. His work has contributed to the development of category-leading businesses across NewSpring’s portfolio.

Hart holds a BA in finance and an MBA from Bryant University.

The GrowthCap Top40 Under 40 Growth Investors of 2025 award is prepared by GrowthCap Advisory. The designation is awarded on an annual basis, and Hart Callahan received the award in 2026. The list of GrowthCap Top Software Investors for 2025 was published on January 7, 2026. Honorees reflect a cross-section of the growth investing ecosystem, including both repeat recipients and first-time awardees. GrowthCap’s evaluation process draws on proprietary research, nomination submissions, and feedback from colleagues, peers, and portfolio company leaders. While not every nominee could be recognized, those selected reflect the depth of talent shaping the growth investing industry.