Foresite Capital Management IV, LLC — Full 13F Portfolio Breakdown

Foresite Capital Management IV, LLC's disclosed holdings carry a Herfindahl concentration index of 0.361 — mathematically equivalent to about 3 equally-sized positions, well below its 8 actual disclosed holdings. That gap points to a strategy built around a small core of high-conviction bets rather than broad diversification.

Position sizes vary widely across the portfolio (a coefficient of variation of 1.47), with a handful of outsized bets alongside many smaller positions.

Recent activity leans toward adding more aggressively to already-large existing positions than to newly initiated ones (a 4.0 percentage-point tilt) — a pattern consistent with a momentum-following approach.

Sector classification currently covers about 14% of this portfolio's disclosed value; the remainder includes holdings (e.g. unmapped tickers, options, or other security types) not yet covered by our sector mapping.