Shares of Warren Buffett's Berkshire Hathaway hit $300,000 — each — for the first time

One "A" share of Warren Buffett's Berkshire Hathaway will set you back about $300,000 as of Monday.

The conglomerate's most expensive share class touched that milestone for the first time in the morning. It has outperformed the S&P 500 this year — rising more than 22% versus the index's 20% gain. It was up more than 1% in trading on Monday.

One share would get you roughly two of Tesla's most expensive car models available now.

If that lofty price makes you break out in hives, the company's B shares trade around $199.72, also up around 22% for the year.

Buffett, the billionaire investor, has long refused to split Berkshire's A shares, which are the world's most expensive stock, saying he wanted long-term investors not short-term speculators. Earlier this year, CNBC reported that stock splits are on the decline lately.

Berkshire's per-share book value rose 10.7% last year, the company told its shareholders in a letter earlier this year. Over 52 years, this measure has increased 19% annually.

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