αTheAlphaInsider

O'Sullivan Michael J.

Outside the top-25 by R-coefficient, but with purchase history.

R-coefficient
skill with Bayesian shrinkage
60d win rate
% of purchases with positive return
Avg 60d return
after their purchases

🧱 Conviction tranches

Repeated purchases of the same stock within ≤5 days — an accumulation pattern.

TickerDateTradesSpanSharesAmount
BRK-B2026-08-1211d488$250K
BRK-B2026-05-0611d536$251K

Purchase history

Later sales by the same insider on the same ticker — realized gain vs average buy price. Empty = position still held.

DateTickerRoleSharesAvg priceAmountSalesAvg sell priceGain %
2026-08-12BRK-BUnknown488$512.44$250K0
2026-05-06BRK-BUnknown536$467.44$251K0