Teradyne is trading 5.5% down at $305.76 after investors reacted negatively to its quarterly results and outlook. - Third-quarter revenue of $1.306 billion and non-GAAP EPS of $2.29 beat expectations. - Fourth-quarter guidance is $1.25 billion–$1.35 billion in revenue and $1.95–$2.25 in non-GAAP EPS, pointing to a possible sequential step-down from Q3. - The semiconductor sector is up 2.59%, so it does not explain Teradyne’s decline.