https://www.cnbc.com/2018/07/31/ipg-photonics-shares-drop-most-in-sp-500-on-big-earnings-miss.html

Laser-manufacturer IPG Photonics shares tanked on Tuesday after reporting disappointing second-quarter earnings before the bell.

Shares were down 26 percent, making it the worst performer in the Standard and Poor's 500 index on Tuesday.