Here are stocks making headlines before the opening bell: Sunrun , First Solar , Enphase Energy — Solar stocks were under pressure Tuesday morning after President Donald Trump issued an executive order calling for the rollback of green energy subsidies, including to "build upon and strengthen" some of the changes in the recent tax bill. Sunrun fell more than 7%, Enphase dropped 3.7% and First Solar slid 2.6%. Datadog — The cloud security stock fell more than 2% following a downgrade to sell from neutral at Guggenheim. Datadog is at risk of losing significant revenue from OpenAI if the artificial intelligence giant opts to build in-house solutions for some of its technology needs, Guggenheim said. JPMorgan Chase , Goldman Sachs , Bank of America — Shares of the three major banks were set to open lower following downgrades from HSBC. JPMorgan and Goldman Sachs each dipped less than 1% after downgrades to reduce from hold. Bank of America dropped 2% after being downgraded to hold from buy. The ratings changes come ahead of the second-quarter earnings season for banks. Shake Shack — Shares of the fast-casual restaurant slipped 1.4% following a downgrade at Loop Capital to hold from buy. After surging 60% over the past couple of months, the stock's current valuation reflects Shake Shack's fundamentals, the firm said. Vertiv Holdings — The AI infrastructure stock rose 2.8% after an upgrade to buy from hold at Melius Research. The investment firm said "the race to spend on AI seems back on track," which would benefit Vertiv. KeyCorp — The financial stock rose about 1% in premarket trading after UBS upgraded the regional bank to buy from neutral. The Wall Street firm said KeyCorp has superior capital arsenal, strong loan growth momentum and the potential for net interest income upside surprises. Coinbase — The crypto exchange gained 1% after KULR Technology Group secured a $20 million credit facility with Coinbase. Chemours — The chemicals company rallied more than 10%, putting it on track to build on its 11.7% advance from the past month. A catalyst for Tuesday's move was not clear. — CNBC's Michelle Fox Theobald and Yun Li contributed.
