This document summarizes research on the influence of human behavior on startup valuations at early funding stages. Interviews with 58 early-stage investors found that when information is limited to support valuation models, investors rely on heuristics, biases, and previous experiences. This challenges the traditional perspective that valuations are purely rational. The research establishes a theoretical foundation to further explore how human behavior impacts the valuation process and brings attention to the non-financial factors in valuations. Future work could validate current claims through quantitative research and explore valuations from the entrepreneur's perspective.