Atlantic Investment Management, Inc. — 13F Filing & Top Stock Positions (Q2 2026)

Atlantic Investment Management, Inc.'s disclosed holdings carry a Herfindahl concentration index of 0.112 — mathematically equivalent to about 9 equally-sized positions, close to its 12 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 0.62), 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 4.1 percentage-point tilt) — a pattern consistent with a more contrarian, new-idea-driven approach.