Israeli cloud cybersecurity startup Upwind is in the final stages of closing a $100 million Series B round at a valuation of $850-$900 million.The round includes a mix of new and existing investors, such as Craft Ventures, Greylock, CyberStarts, Leaders Fund, Sheva Fund, and Penny Jar.Upwind plans to use the funding for R&D and hiring, aiming to add around 100 people to its staff.The startup focuses on assessing and securing cloud infrastructure, reducing alerts by 90% to enhance security operations.