No, Amazon did not increase its stake in Vermont electric aviation company Beta Technologies.

But if you read financial blogs on Tuesday, you could be forgiven for thinking so.

On Tuesday evening, financial news outlet Barron’s published a story headlined, “Beta stock soars 25%. Thank Amazon.”

Indeed, Beta Technologies saw a sudden surge in its stock price, which had been declining steeply since the company’s initial public offering at $34 in November. In the 90 minutes after the market closed on Tuesday, its stock price moved from $16.77 a share to more than $20.

The reason, Barron’s and others noted, appeared to be that Amazon had just filed paperwork with the U.S. Securities and Exchange…