SK Telecom Ltd. (SKM) reached a four-year high after being identified as a key partner for Nvidia Corp. in developing a semiconductor company's digital twin using Nvidia's "Omniverse" platform. SK Telecom successfully created a digital twin of SK Hynix’s semiconductor factory and plans to expand this technology across various manufacturing industries. The stock surged nearly 19% in intraday trading, closing at $44.43.

Charles River Laboratories International, Inc. announced its participation in two upcoming investor conferences: the William Blair 46th Annual Growth Stock Conference on June 2nd, and the Jefferies Global Healthcare Conference on June 3rd. Management will discuss the company's strategic focus, business developments, and recent trends. Webcasts of both presentations will be available on the Investor Relations section of the company's website.

Qualcomm (QCOM) shares dropped 8.8% following Nvidia's announcement of its new RTX Spark superchip, which will compete in the devices market, including personal computers. This decline is attributed to investor profit-taking after QCOM hit a record high last Friday, combined with concerns about Nvidia's entry into a market dominated by Qualcomm's Snapdragon processors. Qualcomm is also set to pay a dividend of $0.92 to shareholders on June 25.

Jim Cramer has discussed Wells Fargo (WFC) multiple times, praising its CEO Charlie Scharf and the lifting of Federal Reserve restrictions. However, Cramer stated that other banks are currently performing better than WFC. Despite this, Wells Fargo's shares are up 3.7% over the past year but down 18.6% year-to-date, with analysts maintaining a "Hold" or "Buy" rating and setting price targets between $86.5 and $98.

Qualcomm (QCOM) experienced an 8.78% stock decline amidst new competition fears from Nvidia, which unveiled its RTX Spark superchip co-developed with Microsoft for the devices market. This new chip poses a direct threat to Qualcomm's Snapdragon processors, impacting its dominant position in PCs and other devices. The stock's fall also includes profit-taking after reaching an all-time high, with Qualcomm scheduled to pay a $0.92 dividend on June 25.

Jim Cramer highlighted that Applied Materials (AMAT) is struggling to meet the immense demand for semiconductor manufacturing equipment, particularly memory machines, essential for the AI era. Argus raised its price target for AMAT to $500 from $420, maintaining a Buy rating and citing strong AI chip demand for the company's long-term outlook. Impax US Sustainable Economy Fund also discussed AMAT, noting its strong performance driven by a February earnings beat and positioning as a key beneficiary of accelerating AI infrastructure investments.

Rocket Lab director Alexander R. Slusky sold 60,000 shares of common stock for approximately $8.96 million on May 28, 2026. The sales occurred as Rocket Lab shares traded near their 52-week high, following a 357% gain over the past year. Slusky still indirectly and directly holds a significant number of shares, while InvestingPro analysis suggests the stock is currently overvalued with high volatility.

This article lists the top gainers and losers in the US markets during Monday's after-hours trading session. It provides specific percentage changes and comments for each mentioned stock, highlighting significant movements for companies like CYPRESS ENVIRONMENTAL PARTNERS (CELP), SENTAGE HOLDINGS INC (SNTG), and OCEANPAL INC (OP) among gainers, and THREDUP INC (TDUP), DIGITAL BRANDS GROUP INC (DBGI), and ENSERVCO CORP (ENSV) among losers.

E. Michael Blum, a director at Richmond Mutual Bancorporation (RMBI), recently bought 1,500 shares of common stock at $14.355 per share in an open-market transaction, increasing his direct holdings to 44,185 shares. Additionally, Blum holds a fully exercisable right to purchase 36,580 more common shares at an exercise price of $10.53 per share, which is valid until October 1, 2030. This insider purchase signals confidence in the company.

Riskified director Shachar Erez sold over $1 million in Class A Ordinary Shares in late May through Qumra Capital, where he serves as a Managing Partner. Despite this insider sale, the company recently reported first-quarter 2026 earnings with revenue exceeding expectations, and DA Davidson reiterated a Buy rating with a $6.00 price target. This suggests ongoing market confidence in Riskified's prospects.