The S&P 500 was up 0.7% in midday trading to 2,142.68.

The Dow Jones Industrial Average was up 0.6% to 18,192.72.

The NASDAQ was up 0.9% to 5,175.18.

The yield on a 10-year Treasury bond was up 1% to 1.69%.

The price of gold was down 0.4% to $1,329.

HEALTHCARE

Laguna Hills-based Glaukos Corp. was up 3.8% to $33.25 and a $1.1 billion market cap on above-average volume. The company makes medical devices to treat glaucoma.

Irvine-based NuGene International Inc. was up 20% to 75 cents and a $30 million market cap on very high volume. The company makes skin care products.

RETAIL

Irvine-based Tilly’s Inc. was up 4.4% to $9.80 and a $280 million market cap on high volume. The company runs a chain of youth apparel stores.

Irvine-based Boot Barn Holdings Inc. was down 6.5% to $10.21 and a $270 million market cap on moderate volume. The company runs a chain of western apparel stores.

FINANCE

Irvine-based Consumer Portfolio Services Inc. was up 4.9% to $4.08 and a $101 million market cap on above-average volume. The company services retail automobile loans.