Amazing, I can’t find “bullet bond” or “balloon” in CFA L3 books!
The closest I can get:
A bullet maturity means that the issue is not callable, putable, or sinkable prior to its scheduled final maturity. The trend toward bullet securities does not pertain to the high-yield market, where callables remain the structure of choice. With the hope of credit-quality improvement, many high-yield issuers expect to refinance prior to maturity at lower rates.
(Level III Volume 4 Fixed Income and Equity Portfolio Management , 4th Edition. Pearson Learning Solutions p. 70).
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PS. By searching “bullet”, I got bullet portfolio.