Sands Capital, a private equity firm, led a $320m Series D funding round in Klaviyo, a customer data and marketing automation platform. Additional investors include Counterpoint Global (Morgan Stanley), Whale Rock Capital Management, ClearBridge Investments, Lone Pine Capital, Owl Rock Capital, Glynn Capital, Keith Block, Accel and Summit Partners. "Klaviyo has become the standard for how many online businesses are interacting with their customers, empowering an all-around better way of doing business and redefining what it takes for them to achieve independent success. We are extremely excited to start a long-term partnership with the team at Klaviyo as they further grow their powerful, yet easy to use software platform that customers love," Michael Clarke, Sands Capital Managing Director.