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tocks finished firmly higher Friday, capping a tumultuous week of trading in U.S. markets that concluded with the three main equity indexes booking weekly gains.

But despite the upbeat note that the final full week in March delivered, strategists and market participants were chirping about a major block trade in the final minutes of Friday trading that could portend further stress on the market, which has been subject to bouts of turbulence as rising interest rates amid the rollout of COVID vaccines and a $1.9 trillion aid package complicate the financial outlook.

Media stocks were hammered on Friday, with shares of ViacomCBS and Discovery part of what Bloomberg News reported as an“unprecedented” $35 billion in block trades, that included Chinese companies as well as the U.S. media conglomerates.

Both shares ended the week down more than 27%, capping a period that saw ViacomCBS’s Class B sharesVIAC,-27.31%finishing at their lowest level since Jan. 25 and booking its steepest daily percentage drop in its history.

Discovery sharesDISCA,-27.45%,meanwhile, posted their sharpest one-day drop since Sept. 18, 2008, falling to their lowest close since Feb. 4 and producing the second-worst performance among S&P 500 stocks, with the second-most activity of any member of the broad-market benchmark.

ASunday report by Bloomberg News, citing people familiar with the matter, pointed to Archegos Capital Management LLC — the family office of trader Bill Hwang — as an institution that sold a major block of Viacom and Discovery as well as dumping shares of Chinese technology companies and other U.S. media conglomerates.The Wall Street Journallater reported the same.

It is unclear what the big sales will ultimately mean for Monday’s open in the U.S., but market participants were eagerly awaiting.

“While the speed of the fall has attracted attention for all of the wrong reasons, prompting speculation of a large margin-call liquidation, what most people appear to have missed is that both of these companies have seen their share prices almost quadruple since October last year,” wrote Michael Hewson, chief market analyst at CMC Markets, in a Sunday note.

The Dow Jones Industrial AverageDJIA,+1.39%closed up 453.40 points, or 1.4%, on Friday, the S&P 500 indexSPX,+1.66%finished 65.02 points, or 1.7%, higher to settle at 3,974.54, while the Nasdaq Composite IndexCOMP,+1.24%rose 161.05 points, or 1.2%, to finish at 13,138.72.