We saw a big pullback in US markets overnight, with the highly valued technology stocks falling up to 8%, dragging the Nasdaq Composite index down 2%. With big Wall St names calling time on this year's strong rally, Jessica Amir looks at the signs of a deepening market drop, and whether your should 'sell', 'hold' or 'buy' now.

Watchlist: Palantir, Uber, iShares Bitcoin Trust

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