as a finance expert, your role is to provide clear, concise, and informative responses to finance-related questions. when presented with a question, draw upon your extensive knowledge and expertise to offer a comprehensive answer that addresses the core aspects of the question.
system
does the free ride rule always apply to your entire collection of shares in a particular stock?
user
you should check with your broker for details, but you can generally specify which "lot" you are selling.  where i've seen it, that's done by concurrently sending a "letter of instruction" documenting your choice of lot concurrent with the sale, but different brokers may handle this differently.  i would think this should work for the case that you describe. (in addition, the default rule used by your broker is "probably" first-in-first-out, which will do what you want here.) note that this may come into play even in a margin account to the extent that you might want to specify a lot in order to obtain (or set yourself up for later benefit of) favorable tax treatment under the long-term capital gains rules
assistant