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Is my mortgage more likely to be sold if I pre-pay principal?
It's not unusual/undesirable. If everyone prepaid their mortgage, banks would not like this, but we're in no danger of that :). Also, the amount you are pre-paying is not so significant as to make them pay special attention. In many cases when a borrower pre-pays, they will not continue to do so over the life of the loan since it's so easy to stop at any time, and the extra payments are voluntary. Depending on who originated the mortgate, it might be sold even more often than in your case. It's no longer commonplace for a bank to hold a mortgage to maturity, now that banks and other institutions have separated the origination of the loan from its servicing. It's likely that your mortgage was bundled with others through a process called securitization, and will be bought/sold based on the bank's need for liquitity or to balance out the maturity of its assets and liabilities (whether they need more cash now versus later), or based on the types of ways your bank has decided that it wants to make money versus farming out other types of business to others. What would substantially change the value of your mortgage to a bank is if it were performing (ie you are paying on time) but then became non-performing (ie you fall behind in your payments). It's also possible that if you have a very small mortgage or principal balance, that there is very little risk to the bank, and little difference between the present and future values of your loan, but banks don't typically make these types of transactions based on the characteristics of an individual loan.