A 10-Q is filed after the first, second and third fiscal quarters; there’s no 10-Q for the fourth quarter, because the 10-K covers the full year. In the SEC’s words, it gives similar but more abbreviated disclosure, and its financial statements are unaudited. Large accelerated and accelerated filers get 40 days after the quarter ends; everyone else, 45. Sources: SEC, Investor.gov; Form 10-Q instructions.
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Sources are in the description. Question for you: did you know there's no 10-Q for the fourth quarter?