Hannah Aaron Lang

As my colleague Dan Gallagher reported, investors are used to seeing big numbers from these kinds of tech companies.

What they're missing is the assurance that it can last.

Shares of Micron, which have surged more than 300% over the past 12 months, fell almost 4% on Thursday after the company reported results.

And finally, shares of Supermicrocomputer posted one of their biggest daily declines ever on Friday after U.S.

prosecutors charged three people, including the company's co-founder, with smuggling machines with high-end NVIDIA chips to China.

The stock was down roughly 30% in Friday afternoon trading.

Yikes.

The move in Supermicro stock erased more than $4 billion from its market value.

For context, at Thursday's close, Supermicro had a market cap of roughly $18.5 billion.

In an unsealed indictment, prosecutors accused the three people of helping smuggle servers into China through, quote, "...a tangled web of lies, obfuscation, and concealment."

all to drive sales and generate revenues in violation of U.S.

law, end quote.

While Supermicro wasn't named as a defendant, the company did place its co-founder on leave after learning of his alleged role in the scheme.

The company also said it placed a second employee on leave and fired a contractor.

The debacle left Supermicro's stock in shambles.

For the week, shares lost 33 percent, the most of any stock in the S&P 500.

And now you know what's news in markets this week.

You can read about more stocks that moved on the week's news in our live markets coverage on WSJ.com.

Today's show was produced by Alexis Moore with supervising producer Jana Herron.

I'm Hannah Aaron Lang.