Wall Street ticked modestly higher early Monday ahead of a highly-anticipated interest rate decision later this week by the Federal Reserve.

Futures for the S&P 500 edged up 0.2% before the opening bell, while futures for the Dow Jones Industrial Average were unchanged. Nasdaq futures were up 0.3%.

Among the biggest stock movers in premarket were a trio of companies that are moving up to trade on the S&P 500, including Carvana, CRH and Comfort Systems USA. Auto retailer Carvana climbed nearly 9%, building materials company CRH jumped 7% and construction contractor Comfort Systems USA rose 1.4%.

Berkshire Hathaway lost less than 1% after the Warren Buffett-led conglomerate announced that investment manager and Geico CEO Todd Combs is leaving the company and heading to JPMorgan Chase. Buf

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