Laura & John Arnold Foundation SEC 13F Holdings (Q2 2026) — Top Position: ISHARES EXPANDED TECH-SOFTWA

Laura & John Arnold Foundation's disclosed holdings carry a Herfindahl concentration index of 0.309 — mathematically equivalent to about 3 equally-sized positions, close to its 5 actual disclosed holdings. Value is spread relatively evenly across the portfolio rather than concentrated in a handful of names.

Position sizes are fairly uniform across the portfolio (a coefficient of variation of 0.83), suggesting a disciplined, rules-based approach to how much capital goes into each idea.

Recent activity leans toward initiating meaningfully larger new positions than it adds to existing ones (a 3.8 percentage-point tilt) — a pattern consistent with a more contrarian, new-idea-driven approach.

Sector classification currently covers about 43% 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.