The S&P 500 (SNPINDEX: ^GSPC) declined 12% during the next five trading days, leaving the index 19% below the record high reached in February. Ahead of that tariff-driven market crash, Warren Buffett's Berkshire Hathaway made two interesting capital allocation decisions in the fourth quarter.

While we don't know yet if Buffett bought stocks in April, he did buy five stocks during the early part of the S&P 500's plunge. Japanese regulatory filings revealed that Berkshire added to its positions in Itochu (OTC: ITOCF) (OTC: ITOCY),

Berkshire Hathaway 's ( BRK.A -0.33%) ( BRK.B -0.11%) portfolio has changed significantly over the past year, even though billionaire investor and company CEO Warren Buffett hasn't exactly been loading the company's portfolio with stocks. Investors have been taking note of Buffett's seemingly conservative investment strategy and what it might mean.