FillStub Reconstructs the Life of an Options Trade

Field notes

The sample ledger exposes the reconciliation steps rather than presenting only a final return: 87 broker rows become 43 contracts and 13 structures, with rolls, assignments, and expirations retained in sequence. It also distinguishes 40 contracts for a 60/40 Section 1256 treatment and carries a cash-settlement amount through an assignment example. The page says files are parsed in the browser and lists tastytrade, IBKR, thinkorswim, and Robinhood as supported sources.