"Xilinx Earnings Miss Wall Street's Target, Stock Tanks Late" (XLNX)

There was an odd trade in very early afterhours action, maybe eight minutes after the bell where someone sold ~17,000 shares at the market and at a $1.79 discount to the previous trade.
Said someone wanted out and didn't want to go sit on the offer and I wondered why they were in such a hurry with the earnings not due for another 12 minutes.
Odd.

Today's last AH print was at  $127.8099  down $11.9101 (8.52%) with the after-hours low being $121.63.  (16:27:05 PM)
Anyway, all that is for others to ponder, on to the explanations.

First up, Investor's Business Daily:

Chipmaker Xilinx (XLNX) late Wednesday missed analyst estimates for earnings in its fiscal fourth quarter, but beat views on sales. The Xilinx earnings news pummeled its stock in extended trading.

The San Jose, Calif.-based company earned an adjusted 94 cents a share on sales of $828 million in the March period. Analysts expected Xilinx earnings of 96 cents a share on sales of $819 million, according to Zacks Investment Research. On a year-over-year basis, Xilinx earnings rose 34% while sales climbed 30%.

Xilinx stock tumbled 12%, near 123, in after-hours trading on the stock market today. During the regular session, Xilinx stock rose 1.9% to 139.72.

For the current quarter, Xilinx expects sales of $850 million, based on the midpoint of its guidance. It did not give a target for earnings per share....MORE

And the above-mentioned Zacks:
Xilinx (XLNX) Lags Q4 Earnings Estimates

Xilinx (XLNX - Free Report) came out with quarterly earnings of $0.94 per share, missing the Zacks Consensus Estimate of $0.96 per share. This compares to earnings of $0.64 per share a year ago. These figures are adjusted for non-recurring items.
This quarterly report represents an earnings surprise of -2.08%. A quarter ago, it was expected that this computer chipmaker would post earnings of $0.85 per share when it actually produced earnings of $0.92, delivering a surprise of 8.24%.

Over the last four quarters, the company has surpassed consensus EPS estimates three times....MORE

The company also announced they made an acquisition beefing up their data center offerings:

Xilinx to Acquire Solarflare 

But the press release has the same timestamp as the earnings release.  Don't do that. Get the numbers out first.
The stock was up 64.0% Year-to-Date; Dec. 31 to April 24 - close-to-close, but tomorrow's open is definitely going to cut into the YTD and annualized returns.

If we open at that $127.81 we're back to April 4th when it closed at $127.82.

FinViz

It's going higher but probably not tomorrow.