For some, it's what helps us wake up in the morning... and stay awake throughout the day: a cup (or two or three cups) of joe. Private equity firms have also taken notice of coffee when it comes to their investments. From coffee roasters and coffee service providers to coffee maker suppliers and the companies behind the packaging for coffee products, 143 U.S.-headquartered companies involved with coffee have received a PE investment, according to the PitchBook Platform. Thanks mostly to companies offering coffee service, Tennessee has been the most active state for these investments, accounting for 22% of the deal flow over the years. California comes in second (9%), followed by Georgia and Texas with 6% shares apiece.