Seth Klarman on Position Sizing

Baupost's quarterly 13F filings consistently show a concentrated portfolio of fewer than thirty positions, with the top several holdings often representing the majority of disclosed equity exposure. Klarman has been explicit that the firm sees concentration as the natural consequence of process: when only a handful of ideas clear the firm's downside-first test, the portfolio simply reflects that. He contrasts this with the diversification taught in modern portfolio theory, which he views as a hedge against ignorance. In his framing, broad diversification is appropriate when an investor lacks the analytical conviction to differentiate opportunities. When an investor has done the work, broad diversification becomes a drag on returns without meaningfully reducing risk. The 13F further reveals that Baupost's positions are built slowly, often across multiple quarters. Rather than entering at a single price, the firm scales into positions as prices fluctuate around its estimate of value. This behavior is consistent with a value discipline: each incremental purchase is justified only when the price remains below the conservative estimate of intrinsic value, regardless of how much has already been accumulated.