Check out the companies making headlines in midday trading: Insulet — The medical device stock surged more than 19% after first-quarter results beat estimates on the top and bottom lines. Insulet reported adjusted earnings of $1.02 per share on $569.0 million of revenue. Analysts surveyed by FactSet were looking for 79 cents per share and $543.3 million of revenue. The company also hiked its full-year guidance for revenue growth. Expedia — The travel booking platform declined 7% on lower-than-expected top-line results. First-quarter revenue came in at $2.99 billion, below the consensus forecast of $3.02 billion, per LSEG. Expedia also issued soft forward guidance. The Seattle-based company posted 40 cents in earnings per share, excluding items, for the quarter, surpassing Wall Street's estimate of 32 cents. Affirm — The buy now, pay later stock tumbled 13%. Affirm said to expect between $815 million and $845 million in revenue for the fiscal fourth quarter . That midpoint of $830 million is below the consensus estimate of $841 million from analysts polled by LSEG. Lyft — The ride-sharing app surged almost 23% after Lyft posted first-quarter net income of $2.57 million, or 1 cent per share. This was up from a net loss of $31.54 million, or 8 cents per share, this time last year. Lyft also boosted its share repurchase plan to $750 million. DraftKings — Shares of the sports betting company gained more than 2% on the heels of its narrower-than-expected loss for the first quarter. DraftKings lost 7 cents per share, one cent less than analysts had expected, according to LSEG. Revenue for the quarter missed expectations, however, and the company also lowered its full-year revenue and adjusted EBITDA. Sweetgreen — Shares of the salad chain pulled back more than 17% after it lowered its full-year outlook. Sweetgreen now forecasts full-year earnings before interest, taxes, depreciation and amortization, or EBITDA, of roughly $30 million, a decrease from the earlier range of $32 million to $38 million and below the $33.4 million estimate from analysts polled by FactSet. Sweetgreen also cut its revenue estimate for the full year, with the company now expecting between $740 million and $760 million, compared to a prior forecast of between $760 million and $780 million. Microchip Technology — The semiconductor stock advanced 10% on the heels of better-than-expected first-quarter guidance. Microchip expects adjusted earnings in the first quarter of 18 cents to 26 cents per share, while analysts surveyed by LSEG forecast 16 cents per share. The firm also beat analysts' revenue estimates in the fourth quarter. Pinterest — Shares of the social media company gained 5%. Pinterest offered a rosy second-quarter revenue outlook of $960 million to $980 million, which at the midpoint surpassed analysts' expectations. First-quarter revenue of $855 million surpassed analysts' estimates that called for $847 million. Trade Desk — The digital marketing stock soared more than 21% following better-than-expected first-quarter results on the top and bottom lines. Trade Desk reported earnings per share of 33 cents, excluding items, on revenue of $616 million. Analysts surveyed by LSEG were expecting 25 cents in earnings per share and $584 million in revenue. BP — U.S. shares of the British oil and gas firm gained 3% following a Financial Times report that peer companies including Chevron, Shell and ExxonMobil have considered a takeover bid for BP. Monster Beverage — The energy drink stock jumped nearly 2% despite first-quarter revenue that missed Wall Street's estimates. Monster reported revenue of $1.85 billion, while analysts polled by FactSet were looking for $1.98 billion. — CNBC's Lisa Kailai Han, Jesse Pound, Hakyung Kim, Sean Conlon and Alex Harring contributed reporting.