Check out which companies are making headlines after the bell Monday:
Giga-tronics - The provider of electronic instruments reported a fourth-quarter loss of $1.27 million, with its shares falling sharply in after-hours trading.
Micron Technology - The maker of semiconductor devices posted third-quarter earnings per share of 79 cents, excluding items, on $3.98 billion in revenue. Analysts had expected EPS of 70 cents on $3.89 billion in sales. Shares gained in after-hours trading.
Molson Coors Brewing - Morgan Stanley upgraded the brewer to equal-weight from underweight. Shares rose in after-hours trading.
Nabors Industries - The provider of drilling and rig services rose in after-hours trading after Fitch revised the company's outlook to stable from negative.
Sonic - The operator of drive-in restaurants reported third-quarter earnings per share of 30 cents on $152.2 million in revenue. Analysts had estimated EPS of 29 cents on $150 million in sales. Shares jumped in after-hours trading.
—By CNBC's Kate Gibson
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