Until recently, all Canadian mutual funds were required to disclose all their individual trades, offering a unique and ideal opportunity to measure and analyze the cost and performance of mutual funds' trades. We find that active management delivers both cheaper trades and better subsequent performance, and that the dissipative effect of flow-driven transactions costs is primarily through forced sales. Fund size associates with both cheaper trades and better subsequent performance, and a series of trades predicts more price movement in the predicted direction, indicating the value to funds of keeping their trading anonymous.