YC founders set their valuation terms and rarely negotiate, especially with non-lead investors. Attempting to do so is a major red flag that you don't understand the ecosystem's norms. The deal is typically 'take it or leave it,' as founders have often already taken money at those terms.

YC now provides founders an investor's conversion rate (meetings vs. checks). A low rate signals to founders not to prioritize that meeting, forcing VCs to abandon a "catch-all" meeting approach in favor of being highly selective upfront to avoid damaging their reputation within the ecosystem.

Unlike typical fundraising environments, YC Demo Day flips the power dynamic. YC was created to empower founders, so investors must understand they are competing for a chance to invest. Approaching founders with a sense of entitlement is a critical mistake.

Showing up unprepared is a recipe for failure. Investors should proactively use YC's launch platform and track founders on social media to create a shortlist *before* the event. This preparation is essential for having the conviction to make fast, informed investment decisions.

Investors can be non-committal. To cut through ambiguity, founders must create a forcing function by directly asking for the term sheet. If the investor stalls or deflects, it's a negative signal, and the founder should move on.

Rounds for top YC companies often close within 2-3 days of Demo Day. Investors who delay follow-ups by even a few days will miss out. Successful investors book meetings for the next day on the night of Demo Day to stay competitive.

There's a common misconception that all YC rounds close on Demo Day. In reality, many excellent companies are still raising capital afterward. Persistent and helpful investors can still secure an allocation in the days and weeks following the event, or position themselves for the next round.

The most sought-after YC companies have rounds that fill and oversubscribe on the first day of fundraising, often within hours. This extreme velocity means VCs who require multiple meetings or lengthy diligence will lose the deal, necessitating a process built for one-call decisions.

A VC canceled a meeting on a founder who had already flown in for it. This single disrespectful act led the founder to tell the story for a decade, actively harming the firm's reputation. It's a stark reminder that in a small ecosystem, every interaction matters.