Bill Ackman lit the fire and Bill Pulte supercharged it.

Their influence helped drive retail traders to Fannie Mae and Freddie Mac, whose shares have soared more than 500% since Donald Trump’s election a year ago. But now, as equity markets are gripped by volatility and crypto assets suffer their worst rout in years, those same investors are fleeing.

Thursday’s wild selloffs, and further losses Friday, were a reminder that the fervor of retail traders — whipped up in part by Federal Housing Finance Agency head Pulte — can quickly turn sour. Ackman, a billionaire hedge fund manager, sent out a social media post this week blaming forced liquidations and margin calls in the cryptocurrency market for the sagging prices on the mortgage giants.

“I underestimated how much exposure Fannie and F

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