Here are the biggest calls on Wall Street on Tuesday: Deutsche Bank upgrades Palantir to buy from hold Deutsche call Palantir's earnings results "exceptional." "With an even more- reasonable valuation following another substantial beat and raise, we are upgrading our rating to Buy from Hold while maintaining our $200 TP." Read more. Wells Fargo initiates APi Group as overweight Wells says the fire and safety company has a differentiated offering. "We're initiating coverage of APG with an Overweight rating and a $53 price target, as the company offers a highly compelling roll-up M & A playbook and differentiated go-to- market strategy that helps insulate it from many competitive pressures." Loop initiates Rubrik as buy Loop says the cybersecurity company is firing on all cylinders. "In our view, RBRK is among the best-positioned vendors to capture this opportunity, which we expect to accelerate as agentic AI adoption expands." TD Cowen initiates Summit Midstream as buy The firm says the midstream company has "visible growth." "We initiate SMC with a Buy and $39 PT." Oppenheimer initiates ADI Global Distribution as outperform Oppenheimer says it sees several tailwinds ahead. "We initiate coverage of ADI Global Distribution with an Outperform rating and a $30 price target. Spun from Resideo on August 4, ADIG is the No. 1 North American specialty distributor of low-voltage security, audio-visual, and fire/life-safety products." Piper Sandler initiates CoreWeave as overweight Piper says the stock has plenty more room to run. "CoreWeave primarily serves the very high-end in the market, which are most challenged by energy and component bottlenecks." Roth initiates Arteris as buy Roth says the stock has plenty of room for growth. "AIP is a provider of system intellectual property (IP) semiconductor technology that accelerates the complex system-on-chip (SOC) designs of its semiconductor customers." Bank of America initiates SK Hynix as buy The firm says the stock is undervalued. "We also initiate the ADR at PO of US$250, at a premium of 20% to the local shares, reflecting both the post-IPO observed premium and consistent with Micron's 2027-28E P/E premium above Hynix's local-share multiple." Oppenheimer downgrades Walmart to perform from outperform Oppenheimer says it sees "less compelling outperformance" for Walmart. "Ahead of earnings on 8/20, we spent time revisiting our investment thesis. Based on our work, we are downgrading shares to Perform from Outperform and removing our $140 PT." UBS upgrades BBB Foods to buy from neutral UBS says the LatAm food company is at inflection point. "We upgrade TBBB to Buy, with a new PT of US$51/share." Morgan Stanley reinstates QXO as overweight Morgan Stanley says the building products distributing company has plenty of upside. "We resume coverage of QXO at Overweight and see NTM [next twelve months] focus shifting toward integration + operational execution following a period of robust M & A. PhillipCapital downgrades Apple to reduce from accumulate The firm says it has supply chain concerns for Apple. "We downgrade our recommendation from NEUTRAL to REDUCE, with an unchanged DCF target price of US$290. ... .Supply constraints and rising memory and AI regulations weigh on the near term, and so far, there is no clear evidence that Apple Intelligence is meaningfully driving product upgrades." Wolfe upgrades Madrigal Pharmaceuticals to outperform from peer perform Wolfe says the selloff in shares of the biotech company is overdone. " MDGL Upgrade to Outperform. Stock overcorrected when new bullish signals around the corner." Jefferies downgrades Cigna to hold from buy Jefferies says it sees a lack of positive catalysts for Cigna . "Relative valuation is depressed, but durable catalysts are lacking." Raymond James initiates Vishay Intertechnology as outperform The firm says the semis manufacturer is in the midst of a turnaround. "We are initiating coverage of Vishay Intertechnology with an Outperform rating and $40 price target. In recent years, the company has been undergoing a significant business transformation — Vishay 3.0 — refocusing investment in larger markets with secular growth catalysts and transitioning away from pure commodity products." JPMorgan downgrades Nike to underweight from neutral JPMorgan says the turnaround is taking too long. "... and while NKE has begun to realize initial greenshoots from its Sport Offense strategy within North America & running category, the balance of the portfolio including Intl regions continue to face actions to reset the marketplace & sell-through results remain challenged globally..." Read more. Bank of America reiterates Micron as buy Bank of America says Micron shares are compelling at current levels. "In our view, MU r emains still attractive given: 1) Bear-case earnings (potentially ~$100+) could still be far above historical peak (~$12); 2) Broadening LTAs [long term agreement] (50-70%+ of capacity) improve supply/demand visibility, reduce price volatility..." Wolfe upgrades Landstar System to outperform from peer perform Wolfe says now is the time to own transport stocks like Landstar. "We remain upbeat that we're at the onset of another strong transport cycle. So with transport stocks pulling back in recent weeks, we're looking for buying opportunities within the group and raising our rating on LSTR from Peer Perform to Outperform." Bank of America downgrades Duolingo to underperform from neutral The firm downgraded the stock on valuation. "We downgrade DUOL to Underperform from Neutral because, at 16x BofA's CY27E EBITDA, DUOL shares are valued at a 6x premium to midcap subscription stocks, whose EBITDA growth is similar to DUOL's. Bank of America upgrades Femsa to buy from neutral Bank of America says the LatAm consumer company is firing on all cylinders. " FEMSA is one of Latam's largest consumer companies with interests in beverages, retail, restaurants and fuel. Coke FEMSA (47%-owned) is the world's largest Coke bottler."