Rosenbaum Jay D. 13F Disclosure & Portfolio Data

Rosenbaum Jay D.'s disclosed holdings carry a Herfindahl concentration index of 0.390 — mathematically equivalent to about 3 equally-sized positions, well below its 6 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 1.27), with a handful of outsized bets alongside many smaller positions.

No strong tilt toward either adding to existing winners or initiating outsized new positions was observed in the latest reported quarter.

Sector classification currently covers about 12% 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.