The Vickers Top Buyers & Sellers is a daily report that identifies the five companies the largest insider purchase transactions based on the dollar value of the transactions as well as the five companies the largest insider sales transactions based on the dollar value of the transactions.

Berkshire Hathaway is a holding company with subsidiaries in a diverse range of industries, including insurance, railroads, utilities, energy, finance, manufacturing, and retailing. Its major subsidiaries include GEICO, Burlington Northern Santa Fe, Precision Castparts, and McLane Company. As of December 31, 2024, Berkshire also had about $283 billion of equity investments, including significant stakes in Apple Inc., Bank of America, Coca-Cola, American Express, and Chevron.

Costco operates a membership-based, no-frills retail model, predicated on offering a select product assortment in bulk quantities at bargain prices. The firm avoids maintaining costly product displays by keeping inventory on pallets and limits distribution expenses by storing its inventory at point of sale in the warehouse. Given Costco’s frugal cost structure, the firm is able to price its merchandise below competing retailers, driving high sales volume per warehouse and allowing the retailer to generate strong profits on thin margins. Costco operates over 600 warehouses in the United States and boasts over 60% market share in the domestic warehouse club industry. Internationally, Costco operates another 280 warehouses, primarily in markets such as Canada, Mexico, Japan, and the UK.

Taiwan Semiconductor Manufacturing Co. is the world's largest dedicated chip foundry, with over 60% market share. TSMC was founded in 1987 as a joint venture of Philips, the government of Taiwan, and private investors. It went public as an ADR in the US in 1997. TSMC's scale and high-quality technology allow the firm to generate solid operating margins, even in the highly competitive foundry business. Furthermore, the shift to the fabless business model has created tailwinds for TSMC. The foundry leader has an illustrious customer base, including Apple, AMD, and Nvidia, that looks to apply cutting-edge process technologies to its semiconductor designs. TSMC employs more than 73,000 people.