Dell's venture investment group rides high on billion-dollar IPOs

Unicorns — private companies valued at at least $1 billion — are a rarity. But Dell Technologies Capital has seen three of its portfolio companies reach that lofty status before going public in the past six months.DocuSign Inc. (Nasdaq: DOCU) held an initial public offering in April, Zscaler Inc. (Nasdaq: ZS) had its IPO in March ,and New York-based MongoDB Inc. (Nasdaq: MDB) went public last October; their combined market value now exceeds $11 billion.They were among the 11 exits fo