Seeking Alpha 汇总散户分析师评级：上调 RIVN/MU、下调 AMZN/AMD，均无新增基本面事实

Recent analyst calls from Seeking Alpha include rating upgrades for Rivian Automotive ( RIVN ) and Micron Technology ( MU ), driven by delivery momentum and potential shareholder catalysts respectively. On the downgrade side, Amazon.com ( AMZN ) faces margin pressures amid economic headwinds, while Advanced Micro Devices ( AMD ) sees its rating cut due to stretched valuations despite strong fundamentals. Upgrades Rivian Automotive ( RIVN ): Upgrade to Positive by The Asian Investor . The analyst points to strong Q3 delivery growth of 45.8% year-over-year, fueled by robust adoption of the company's lower-cost R2 SUV, which is positioning Rivian for estimate upgrades and improved profitability. " With the EV enterprise now seemingly seeing its R2 sales go into overdrive, analysts are set to revise their estimates higher, and the company's longer-term delivery prospects are improving. Further, with significant growth acceleration in terms of deliveries, Rivian is also set for revenue gains as well as an improving profitability profile. " Micron Technology ( MU ): Upgrade to Neutral by Uttam Dey . The analyst sees shares potentially entering the final stages of a major shakeout, with AI inference tailwinds and upcoming shareholder-related catalysts following the expiration of CHIPS Act restrictions on December 9, 2026. " I strongly expect Micron to make major investments before the end of this year, which should anchor the company’s outlook of CY27 and improve the visibility of Micron's fundamental outlook moving forward. " Downgrades Amazon.com ( AMZN ): Downgrade by Manika Premsingh . Despite the stock gaining 13% since June, the analyst warns that macro risks have intensified, with margin pressures looming from inflation, higher fuel costs, increased interest expenses, and risks of slowing e-commerce growth. " Going by Amazon's ability to surprise in recent times, I won't rule out a better than expected performance over the remainder of 2026 and even in 2027. But the risks can't be ignored either. Not at a time when the company has a key rising vulnerability in the form of massive capex and rising interest expenses, and its e-commerce sales growth can see a pullback. " Advanced Micro Devices ( AMD ): Downgrade to Hold by Louis Gerard . While AMD has surged over 41% since early September and management projects data center revenue to double to $70 billion by 2027, the analyst notes that valuation metrics have become stretched despite strong fundamentals and sector-leading positioning. " I just believe that the price has gotten too high too fast considering just simple valuation metrics, and yes, that is despite believing that AMD is a great firm that is uniquely positioned as the leader in CPUs and the second-runner in GPUs and AI accelerators. But for the time being, I do not think that I’m willing to pay this price. "