If you buy the same stock three times at different prices, your account holds three lots. When you sell, the cost basis depends on which lots the sale draws from: FIFO (first-in, first-out), or a specific-lot selection. Average-cost methods blur this; lot tracking preserves it, which matters for tax reporting and for understanding true performance.
How Finlynq tracks lots
Finlynq records per-purchase lots and computes realized gains by closing specific lots on a sale. It's multi-currency aware, so realized gains can be expressed in your base currency using historical exchange rates at the open and close of each lot, and it supports short positions and dividend reinvestment. Cash sleeves are tracked as explicit holdings so currency-on-currency FX gains surface correctly.
The result is a portfolio view built for people who actually reconcile their investments, not just glance at a balance.