Your equity book in three readings: positions marked to market, the transaction ledger that produced them, and the allocation that shows where the risk has quietly ended up. Cost basis, unrealised profit and loss and weight are all derived from the transaction history rather than stored separately, so they cannot drift out of agreement with each other.

Every position carries a reading of what its numbers mean rather than a fourth restatement of the same figure. All holdings are simulated and have no real-world value.