Late Night Market Recap Stocks Making the Biggest Moves

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•  19 May 2026
 

$CHWY
Chewy fell 9.11% on volume of 19 million shares, making it the most significant decliner in today data set. The news feed shows no direct company-specific catalyst tied to the move — the information attached to the ticker references candy product launches which appear to be data feed errors unrelated to Chewy. The decline is notable given the volume and may reflect broader consumer discretionary pressure or portfolio rebalancing. Watch for any after-hours commentary or analyst updates before Wednesday open.

$SNOW
Snowflake gained 3.27% on volume of 12.26 million shares. The catalyst appears tied to broader data infrastructure sentiment following the Zeta Global and OpenAI deal news that has been driving AI platform stocks higher this week. Snowflake is directly positioned in the AI data layer and the market is beginning to reprice cloud data warehousing names as agentic AI deployments require faster and larger data pipelines. The move follows a pattern of AI infrastructure names catching a bid on days when AI deal flow is visible in the feed.

$WAY
Waystar gained 5.66% after the company announced a $200 million stock repurchase program. The buyback signal is a meaningful capital allocation statement from a healthcare payments software platform that has been building momentum. A $200 million repurchase on a company of this size reflects management confidence in the business trajectory and removes supply from the market. The move on 3 million shares was clean and volume-confirmed.

$HSAI
Hesai Group fell 9.02% despite reporting first quarter 2026 results that beat both top-line and bottom-line estimates. Quarterly net revenues reached RMB 680.6 million, approximately $98.7 million, and lidar shipments hit 471,723 units. Net income came in at RMB 18.3 million. The sell-the-news reaction is the story here — the company delivered on the numbers but the stock still declined, which suggests either the guidance initiation for Q2 disappointed expectations or the broader Chinese technology sentiment weighed on the print. Hesai is the largest lidar supplier by shipment volume globally and the fundamental print was not the problem.

$DRVN
Driven Brands fell 7.09% on 1.92 million shares despite beating both top-line and bottom-line estimates and initiating full-year 2026 guidance. The pattern mirrors Hesai — beat and guide, stock sells off. In Driven Brands case the automotive services franchisor may be facing investor skepticism around the durability of the guidance given cost pressures in the automotive services sector. The 8-K filing confirms the earnings release was formal and official. Worth watching whether the selloff holds into Wednesday or if buyers step in on the dip given the fundamental beat.

$AMT
American Tower gained 3.12% on 3.18 million shares after filing a 424B5 prospectus supplement, which typically indicates a secondary offering or debt issuance. The fact that the stock gained on a dilutive filing suggests the capital raise is being interpreted as growth-positive, likely tied to infrastructure expansion in international markets or refinancing at favorable rates. American Tower is a direct beneficiary of AI-driven tower demand as carriers upgrade networks to handle increased data traffic from AI-enabled devices.

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