The Invesco QQQ Trust (QQQ) , which has even heavier exposure to Big Tech names, has brought in $5.8 billion of its own. "It's not really the overconcentration in the big names that worries me. It's actually the concentration in the big names compared to their earnings contribution," said Oktay Kavrak, director of communications and strategy at Leverage Shares. Whether you're passive or active, you probably have enough exposure to Nvidia and Apple and Microsoft," said Todd Sohn, ETF strategist at Strategas. There's a whiff of it, a scent of it," Sohn said, pointing out that money market funds attracted more cash than equity funds last week.

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Persons: Matthew Bartolini, Bartolini, It's, Oktay Kavrak, Todd Sohn, . Sohn, Kavrak, Sohn, Cathie Wood's Organizations: Vanguard, Big Tech, SPDR, Street Global Advisors, Microsoft, Nvidia, Nasdaq, RSP, Apple, Trust, Technology, Index, Fund, The Vanguard FTSE Locations: SPDR Americas, Europe