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The S&P 500 climbed 0.6% to 4,159.50 in midday trading.
The Dow Jones Industrial Average increased 0.7% to 34,061.47, while the Nasdaq also rose 0.7% to 13,881.31.
Crude oil fell 2.2% to $61.31 a barrel.
Gold was up 0.8% to $1,793.
The yield on a 10-year Treasury increased 0.128% to 1.564%.

Irvine-based Edwards Lifesciences Corp. (NYSE: EW) jumped 5.8% to $94.81 and a $59 billion market cap. The maker of heart devices, Orange County’s most valuable publicly traded company, yesterday reported first-quarter revenue and profit that topped analysts’ average estimates.

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Staar Surgical Company (Nasdaq: STAA) climbed 5.3% to $125.09 and a $5.8 billion market cap. The Lake Forest maker of ophthalmic products earlier today announced its first-quarter results will be released on May 5. Volume was about a fourth of the daily average.

Newport Beach’s Clean Energy Fuels Corp. (Nasdaq: CLNE) rose 5.8% to $9.89 and a $2 billion market cap. Shares of the supplier of renewable natural gas have been on a roller coaster this week. On April 19, the shares jumped as much as 26% after announcing a fuel supply agreement with Amazon, which is also being issued warrants to buy up to 53.1 million shares in Clean Energy. On April 20, the shares fell 21% following a downgrade from a Raymond James analyst who criticized the Amazon deal.