I sometimes suspect, maybe wrongly, that the cash collateral for CSP (CashSecurePut) trades maybe does not get released at expiration when no assignment occurred. Since the account values are constantly changing due to market-changes, it gets complicated to verify & control the above said issue. Am I alone, or have others a similar suspicion about the release of the held-back funds (collateral) at expiration when no assignment occured? My broker (TDA) unfortunately does not list these held-back collaterals somewhere explicitly; it all just happens "implicitly" or "internally". I just know that the amount "Strike minus PremiumReceived" gets held-back as collateral till the expiration (or assignment). But as said I'm not sure whether that amount then really gets released-back, or maybe simply gets forgotten... How to best verify/check/control that these funds have been correctly released back into the account value and buying power value? To the best of my knowledge, there are no explicit transaction entries about these held-back funds. Or does one need to write a program that parses the statement files and so does own calculations? How do others do it?