Some of America’s top mutual fund companies have plowed billions of dollars into Dropbox, Palantir Technologies, Snapchat, Uber Technologies, and other startups still in venture capital mode. Now, after a year of volatile equity markets and a drop-off in initial public offering activity, fund companies are pulling back on making private deals. But since funds have to update their estimates of what existing investments are worth, their disclosures have become a way for market watchers to track the rising and falling fortunes of Silicon Valley’s “unicorns”—private companies that have touched $1 billion or more in investor valuation. Read the original story from Bloomberg.