Check out the companies making the biggest moves premarket: Hewlett Packard Enterprise — Shares rose more than 5% after Morgan Stanley upgraded the stock to overweight from equal-weight. Analysts at the bank said the company has an attractive risk/reward profile at the moment, and that the market is underappreciating the asymmetry between HPE's earnings power and valuation. Verisk Analytics — The data analytics company tumbled more than 6.5% after a Delaware judge on Friday ruled it must proceed with a $2.35 billion acquisition of AccuLynx. Verisk previously terminated a deal in December because a Federal Trade Commission review of the merger was not completed by the transaction's termination date. Apple — The technology company declined 1% after Jefferies downgraded the stock to underperform from hold. According to the bank's supply chain checks, analysts have concluded than an all-glass iPhone by Apple , something the company has never publicly announced, appears to be canceled. That puts pressure on Apple which is trying to create more expensive devices to combat the rising cost of memory. Rocket Lab — Shares rose nearly 3% as investors prepared for the company's second-quarter earnings report, which is set to be released after the bell Monday. While the stock rose nearly 60% during that period, shares are off more than 40% from their late-May highs. Berkshire Hathaway — The stock was up 0.5% after the company announced on Saturday it saw operating earnings growth of 16% in the second quarter. Manufacturing, service, and retailing earnings saw strong growth, as did the company's energy profits. However, insurance was weaker, where investment income declined 9%. Intel — The chipmaker fell 1% after it filed a proposal with the Securities and Exchange Commission to offer sales of its common stock. In the filing, the company did not disclose how many shares it plans to offer as part of the proposal.