The most important date of the first quarter has nearly arrived -- and I'm not talking about Valentine's Day. Tomorrow, Feb. 14, marks the deadline for institutional investors to file Form 13F with the Securities and Exchange Commission (SEC).

A 13F provides an under-the-hood look at what money managers with at least $100 million in assets under management bought and sold in the latest quarter (in this instance, the quarter ended Dec. 31, 2023). Although 13Fs have their flaws -- e.g., they provide a snapshot from 45 days prior, meaning positions could be outdated -- they can provide clues and insights as to what stocks, industries, and trends are piquing the interest of Wall Street's smartest and most successful investors.

Perhaps no investor garners more attention come 13F release time than Berkshire Hathaway's (NYSE: BRK.A)(NYSE: BRK.B) CEO Warren Buffett.

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Source Fool.com