The stock prices of the so-called Quantum Four are back on the rise today, after already accruing significant gains yesterday as well.

The upward trend is a reversal for IonQ, D-Wave, Rigetti, and Quantum Computing Inc., which have all seen their shares decline since the beginning of the year.

Why are they on the rise again? Here’s what you need to know:

What’s happened?

Yesterday, the stock prices of America’s four largest publicly traded quantum computing companies all rose significantly. As of yesterday’s close, here’s where the quantum computing companies’ stock prices stood: 

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IonQ, Inc. (NYSE: IONQ): up 6.23% to $33.59 D-Wave Quantum Inc. (NYSE: QBTS): up 5.31% to $19.65 Rigetti Computing, Inc. (Nasdaq: RGTI): up 6.98% to $17.63 Quantum Computing Inc. (Nasdaq: QUBT): up 7.03% to $8.68

But the upward momentum hasn’t stopped there. Currently in premarket trading, the stock prices of all four quantum companies are surging again.

According to Yahoo Finance data, as of the time of this writing in premarket trading, the four companies’ stock prices are up the following amounts:

The last two trading days have marked (so far) a dramatic reversal for the stock prices of these four companies. Since the beginning of the year, shares of all four companies had tumbled between 15% and 25% as of yesterday’s close.

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