Should You Buy Berkshire Hathaway Stock Before Jan. 30?

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To say that Berkshire Hathaway (NYSE: BRK.A) (NYSE: BRK.B) has been a big winner for investors over the long term would be an understatement. Between 1964 and 2023, Berkshire's overall gain was a jaw-dropping 4,384,748% -- more than 140 times greater than the S&P 500's gain during the period. Berkshire has also outperformed the S&P 500 since the end of 2023.

There could be a reason to invest in the conglomerate led by Warren Buffett sooner rather than later. The question is: Should you buy Berkshire Hathaway stock before Jan. 30?

What's special about Jan. 30?

You might be wondering what's special about that date. No, Berkshire Hathaway isn't scheduled to report its latest quarterly results then. The company's next quarterly update will probably come in late February. Neither has Berkshire announced any other special event for this week.

However, another company will report its results for the first quarter of fiscal year 2025 on Jan. 30 -- Apple (NASDAQ: AAPL). And it could be one of Apple's more important updates in quite a while. Investors will be especially interested in learning how Apple Intelligence, the bundle of new generative AI features available with iOS 18, affected iPhone sales.

Why does Apple's quarterly update matter to Berkshire Hathaway? Even though Buffett has reduced his company's stake in the consumer technology giant in recent quarters, Apple remains by far the largest holding in Berkshire's portfolio. Berkshire is the sixth largest institutional shareholder, owning around 2% of Apple.

What history shows

Berkshire's position in Apple currently makes up roughly 6.7% of the conglomerate's market cap. That's a significant enough level that Apple's performance matters to Berkshire. But just how much does it matter?

Over the past five years, the correlation coefficient between Apple's and Berkshire's stock performances using monthly returns is 0.49. That's a moderate correlation; 1.0 is very strong.

Could Berkshire Hathaway's share price jump if Apple reports exceptionally great results later this week, though? Maybe. However, if history is any guide, don't count on it.

For example, Apple blew past Wall Street's expectations with its fiscal 2020 third-quarter results, reported on July 30, 2020. The company also announced a 4-for-1 stock split that excited investors. Apple stock promptly soared 10.5% the next day. Berkshire Hathaway's share price increased by less than 1%, a ho-hum move despite Apple's great quarterly update.