Stocks making the biggest moves midday: Sphere, Riot, Instacart, Insulet and more

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Check out the companies making headlines in midday trading.

Sphere — Shares of the media and entertainment company climbed 10% in midday trading after a U2 show debuted its Las Vegas Sphere venue on Friday night. Built by Madison Square Garden Entertainment, Sphere is said to be the newest iteration of immersive and futuristic concert experiences, complete with a next-generation wraparound screen.

Bitcoin stocks — Stocks tied to digital currency trading advanced in lockstep with a rally in crypto prices. Notably, Riot jumped 11.6%, while Marathon Digital popped 6.9%. Coinbase and MicroStrategy both added more than 2%.

Discover Financial Services — The credit card issuer surged almost 6%, the biggest gain in the S&P 500 Monday, after it disclosed in an 8K filing with the Securities and Exchange Commission a consent agreement with the Federal Deposit Insurance Corp.

Gold and silver miners — Gold and silver miners struggled Monday as prices for the metals slid. Coeur Mining and Harmony Gold Mining both dropped nearly 6%. Hecla Mining slid more than 5%, while Gold Resources shares fell more than 4%.

Instacart — Maplebear, the food delivery company doing business as Instacart, fell roughly 5% in midday trading. On Monday, The Information, citing people familiar with the matter, reported the Wall Street bank that underwrote Instacart's initial public offering forecast a weak second-half outlook with slower revenue growth and lower profits. Separately, Gordon Haskett initiated coverage of the company with a hold rating.

SolarEdge — Shares eased 3.7% following a downgrade to equal weight from overweight at Barclays. The firm said the company will likely see price cuts in the next year.

Insulet — Shares of the