Image source: Alliance Fiber Optic Products.

What: Shares of Alliance Fiber Optic Products (NASDAQ:AFOP.DL) jumped 19.5% early Friday after the company announced it has entered into a merger agreement with Corning (NYSE:GLW).

So what: Corning technically hasn't started the formal offer yet, but a letter (contained in an SEC filing this morning) from Alliance Fiber Optic CEO Peter Chang to employees indicates Corning intends to acquire all shares of AFOP common stock outstanding at $18.50 per share.

"Corning has been one of our key customers over the past few years," Chang wrote. "[...] We believe Corning's strong track record and reputation in our industry, along with its size and scale, will provide an excellent platform for our products to gain access to a broader customer base and drive a higher level of growth than AFOP would be able to achieve as a stand-alone company."

Now what: The offer will expire at 12:00 a.m. ET 20 business days after it is commenced. Of course, that may not appease some investors considering that even after today's pop, Alliance Fiber Optic Products shares now sit just slightly higher than they were this time last year. To its credit, though, Alliance Fiber Optic shares have more than tripled over the past five years.

Nonetheless, it should come as no surprise that at least two law firms have come out of the woodwork this morning to announce investigations over whether the proposed sale is truly in the best interest of shareholders. But unless those shareholders have the time and resolve to take the long-shot bet such lawsuits will either prevent a sale or negotiate a higher price -- and with shares now trading at almost exactly the proposed offer -- I think investors would be wise to take today's gains and put them to work elsewhere.

This article represents the opinion of the writer, who may disagree with the “official” recommendation position of a Motley Fool premium advisory service. We’re motley! Questioning an investing thesis -- even one of our own -- helps us all think critically about investing and make decisions that help us become smarter, happier, and richer.