Sanofi SA vs Bristol-Myers Squibb: why the prices moved differently

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  Amlitelimab discontinued for atopic dermatitis Sanofi stopped developing amlitelimab for atopic dermatitis after a pipeline review found it was no better than current treatments. This removes a key future immunology drug, which can lower investor expectations for growth and weigh on the stock price.

  This is a major pipeline failure that directly affects Sanofi's future revenue prospects.

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  Advertising watchdog questions Dupixent claims The National Advertising Division recommended Sanofi modify or stop some Dupixent TV and prescriber claims about long-lasting clearer skin and fast itch relief. This could limit marketing and slow sales of Sanofi's biggest drug, a negative for the stock.

  Regulatory scrutiny of Dupixent marketing could hurt sales of Sanofi's top revenue driver.

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  New Phase 1 trial for oral STAT6 degrader Sanofi began a Phase 1 trial of an oral STAT6 degrader for type 2 inflammatory diseases, triggering a $10 million milestone to partner Nurix. This early-stage asset shows pipeline progress and could become a future growth driver, supporting the stock.

  It demonstrates continued pipeline advancement despite the amlitelimab setback.

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  High dividend yield and buyback support valuation Sanofi offers a 5.6% dividend yield and completed a €1 billion buyback, with total shareholder yield near 11%. Dupixent sales grew 31% and the stock trades at a low forward P/E of 9, making it attractive to income and value investors.

  These capital returns and cheap valuation provide a floor for the stock price.

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  New drug sales surge 48.3% Sanofi's new and acquired drugs, like Altuviiio and Sarclisa, grew sales 48.3% to €1.3 billion in Q2. This shows the company is building new revenue sources beyond Dupixent, which supports the stock price.

  This is a key positive fundamental driver showing Sanofi's growth diversification.

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  Expanded Regeneron alliance Sanofi will pay $1 billion upfront and up to $7 billion in milestones to co-develop four new antibodies with Regeneron. This broadens Sanofi's pipeline and settles litigation, boosting investor confidence.

  This major partnership expansion is a new positive catalyst for Sanofi's future growth.

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  Competitive threats to key drugs Novartis's remibrutinib beat Sanofi's Aubagio in MS trials, and AstraZeneca's tozorakimab may reach more COPD patients than Dupixent. These rival drugs could erode Sanofi's sales in important markets.

  These competitive losses directly threaten Sanofi's existing product revenue.

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  Portfolio restructuring with Cheplapharm Sanofi is handing 20 mature medicines and three plants to Cheplapharm for a 26.4% stake. This simplifies the business but removes steady revenue, with no impact on 2026 guidance.

  This strategic divestment has ambiguous implications for Sanofi's future earnings.

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  EU approval of MenQuadfi for infants Sanofi won EU approval to use its MenQuadfi vaccine in infants as young as six weeks, opening a new market. This should boost vaccine sales and strengthen Sanofi's pediatric portfolio, supporting the stock price.

  This is a new regulatory win that directly expands Sanofi's vaccine market and revenue potential.

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  Novavax partnership advances with milestones Sanofi's partnership with Novavax is progressing, with a Phase 3 COVID/flu combo study planned and milestone payments ahead. Sanofi will lead commercial launches of Nuvaxovid, adding to its vaccine business and future revenue.

  This shows Sanofi's collaboration is moving forward, with potential milestone income and expanded commercial reach.

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  Permanent halt of infant RSV vaccine trial Sanofi permanently stopped its Phase 3 RSV vaccine trial in infants after an infant death, raising safety and regulatory concerns. This removes a potential future product and may hurt Sanofi's reputation in pediatric vaccines, weighing on the stock.

  This is a major pipeline setback with reputational and regulatory implications that could lower investor confidence.

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  Competition heats up from AbbVie and Moderna AbbVie is buying Apogee to get a drug that could rival Sanofi's top-selling Dupixent, while Moderna won FDA approval for the first mRNA flu shot, challenging Sanofi's flu vaccine franchise. Both threaten key Sanofi products.

  These are new competitive threats that could pressure Sanofi's sales in two major areas: immunology and flu vaccines.

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  Q2 earnings beat and raised 2026 guidance Sanofi reported Q2 sales up 17.8% and raised its 2026 outlook, with Dupixent sales jumping 37.6% to €5.2 billion. This strong performance and confident guidance signal accelerating growth, which should lift investor confidence and support a higher share price.

  This is the most significant new event, directly showing Sanofi's financial health and future prospects.

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  Amlitelimab development halted for atopic dermatitis Sanofi discontinued amlitelimab for moderate-to-severe atopic dermatitis, a key pipeline candidate, due to insufficient efficacy and safety data. This removes a potential growth driver and may hurt sentiment, as investors had high hopes for the drug in a large market.

  This is a major pipeline setback that could negatively impact future revenue expectations.

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  Dupixent partner Regeneron beats estimates Regeneron's strong quarterly results, driven by Dupixent sales up 38% to $6 billion, confirm robust demand for Sanofi's top-selling drug. As Sanofi records these sales, the beat reinforces confidence in Dupixent's growth trajectory and Sanofi's earnings power.

  This provides independent validation of Dupixent's blockbuster performance, a key value driver for Sanofi.

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  Aqemia AI collaboration expands with new target Sanofi expanded its AI-driven drug discovery partnership with Aqemia, nominating a new target and potentially paying up to $140 million in milestones. This strengthens Sanofi's early-stage pipeline and shows commitment to innovative technologies, which could yield future blockbuster drugs.

  This highlights Sanofi's investment in cutting-edge R&D, supporting long-term growth prospects.

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  FDA approves Sarclisa Escena on-body injector The FDA approved subcutaneous Sarclisa Escena for all multiple myeloma uses, the first anticancer treatment given via on-body injector. It cuts treatment time and infusion reactions, which can lift sales and strengthen Sanofi's cancer franchise.

  This is a new regulatory approval that expands a key product's use and could drive future revenue.

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  Nexviazyme hits all goals in infant Pompe disease trial Sanofi's Nexviazyme met all endpoints in a phase 3 study for infants with infantile-onset Pompe disease, supporting a US label extension filing later in 2026. Success in a rare disease with few options adds a new growth driver.

  Positive late-stage trial data for an existing drug opens a new patient population and revenue stream.

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  WAYRILZ positioned in fast-growing AIHA market A market report projects 14.4% annual growth for warm autoimmune hemolytic anemia treatments through 2036, with no approved therapies yet. Sanofi's WAYRILZ is a key late-stage candidate, giving it a large untapped opportunity if approved.

  Highlights a new market opportunity for a Sanofi pipeline drug, supporting long-term growth prospects.

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  UBS cautious on Sanofi within favored pharma sector UBS likes European pharma as a safer bet than AI but is more cautious on Sanofi, preferring AstraZeneca and Roche. This relative caution may steer some investor money away from Sanofi shares, limiting upside versus peers.

  Analyst preference can influence capital flows and relative stock performance.

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  Dupixent sales surge 30.8% to €4.17B Dupixent sales jumped 30.8% to €4.17 billion in Q1 2026, driven by new approvals including COPD. Management targets €22 billion by 2030. This strong growth supports Sanofi's revenue and profit outlook, pushing the stock up.

  Dupixent is Sanofi's biggest growth driver, and its sales performance directly impacts earnings and investor confidence.

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  Multiple new drug approvals in Japan and EU Sanofi received approvals for Sarclisa SC and Wayrilz in Japan, and Cenrifki in the EU. These expand its specialty care portfolio into new markets and indications, offering new revenue streams and boosting long-term growth prospects.

  New approvals open additional revenue sources and demonstrate pipeline strength, which can lift the stock.

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  EU antitrust probe into flu vaccine marketing The EU opened an antitrust investigation into Sanofi over alleged disparagement of a rival flu vaccine. If confirmed, Sanofi could face a fine for abuse of dominance. This creates legal and financial uncertainty, weighing on the stock.

  Regulatory investigations can lead to fines and reputational damage, directly affecting investor sentiment and potential costs.

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  AbbVie acquires Apogee to compete with Dupixent AbbVie is buying Apogee Therapeutics for $10.9 billion, gaining zumilokibart, a potential competitor to Dupixent with less frequent dosing. This intensifies competition in inflammatory diseases, threatening future Dupixent sales and market share.

  Competitive threats to Sanofi's top-selling drug can pressure future revenue and stock valuation.

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  Reblozyl Sales Near $1.3 Billion, FDA Sets 2027 Decision Reblozyl sales hit nearly $1.3 billion in the first half of 2026, up 23%, as it helps replace older drugs losing patent protection. The FDA accepted a supplemental application for use in myelofibrosis-associated anemia, with a decision expected by March 2027. This supports future revenue growth and lifts BMY's outlook.

  Shows a key growth drug's strong sales and a regulatory step that could expand its use, directly supporting BMY's revenue replacement story.

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  Zenbexus Launch Advances with Onco360 Pharmacy Network Bristol selected Onco360 for the specialty pharmacy network of its newly approved myeloma drug Zenbexus, moving the launch forward. Getting the drug to patients is key to replacing revenue from older myeloma drugs facing generic competition. Successful rollout could add a new blockbuster stream over time.

  Highlights concrete progress in commercializing a new drug that is central to offsetting patent losses.

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  Bristol Raises Guidance and Builds $2.3 Billion Houston Campus Bristol raised its full-year revenue guidance to about $49–50 billion and announced a $2.3 billion manufacturing campus in Houston. The guidance raise signals confidence in the business, while the plant expands capacity for future drugs. Both support the stock by improving the profit outlook and long-term supply.

  Guidance raise and major investment show management's confidence and capacity for growth, key drivers for the stock.

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  Patent Cliff and Weak Financials Weigh on Sentiment Analysts warn that Bristol's low valuation reflects looming patent expirations on Revlimid, Pomalyst, and Eliquis, which will cause revenue declines. One report also flagged weak long-term financials: slow revenue growth, falling margins, and declining earnings per share. These concerns keep a lid on the stock despite new drug progress.

  Presents the main counterweight: patent losses and weak financial trends that could pressure the stock even as new drugs grow.

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  Growth Portfolio Now 56% of Revenue, EPS Estimates Raised Bristol's growth products (Opdivo, Camzyos, Sotyktu, etc.) now make up 56% of total revenue, up from 51.8% a year ago, with first-half sales up 13%. Analysts have raised 2026 EPS estimates to $6.91 from $6.34, reflecting confidence that new drugs are replacing older ones losing patent protection. This supports a higher stock price.

  Shows the core shift from legacy to growth products that is driving earnings upgrades and investor optimism.

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  Zenbexus (iberdomide) Wins FDA Approval and Shows Strong Phase 3 Data The FDA granted accelerated approval to Zenbexus for multiple myeloma, the first in a new drug class. In a Phase 3 trial, it doubled the rate of deep responses (MRD-negative complete responses) versus standard treatment. This adds a potential blockbuster revenue stream and validates Bristol's pipeline, lifting the stock.

  A new approved drug with superior efficacy data is a major growth catalyst that directly boosts future revenue expectations.

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  Sotyktu Shows Sustained Two-Year Efficacy in Psoriatic Arthritis Bristol's Sotyktu maintained strong efficacy and safety over two years in patients with psoriatic arthritis, with responses improving through week 104. This supports the drug's long-term use and potential to capture more market share in a large patient population, adding to revenue growth.

  Long-term data reinforces the commercial potential of a key growth product, supporting revenue forecasts.

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  Camzyos Approval Expanded to Pediatric Patients The FDA expanded Camzyos's label to include pediatric patients with obstructive hypertrophic cardiomyopathy, making it the only approved therapy for this age group. This broadens the patient pool and strengthens Camzyos's growth trajectory, a positive for Bristol's revenue outlook.

  Label expansion opens a new patient population, directly increasing the drug's market size and sales potential.

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  Zenbexus FDA Approval Adds New Myeloma Growth Driver The FDA approved Bristol's oral Zenbexus for relapsed multiple myeloma, a new revenue stream to help replace older drugs losing patent protection. It's an accelerated approval needing confirmatory trials and faces intense competition, so it builds gradually rather than instantly lifting the stock.

  This is a new drug approval that directly adds a future revenue driver for BMY.

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  J&J's Oral Psoriasis Pill Approved in China, Threatening Sotyktu Johnson & Johnson won Chinese approval for its once-daily oral psoriasis pill, which will compete with Bristol's Sotyktu in a market of over 8 million patients. This adds competitive pressure that could limit Sotyktu's growth in China, weighing on BMY's sentiment.

  New competitive threat in a key market that could slow BMY's psoriasis drug sales.

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  Five-Year Camzyos Data Reinforces Long-Term Heart Drug Profile Bristol presented five-year data showing its heart drug Camzyos keeps working safely, with most patients improving. This strengthens confidence in a key growth product and supports its use long-term, a positive for BMY's revenue outlook.

  New clinical data that supports the durability and safety of a key growth drug.

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  CAR-T Safety Concerns After Novartis Deaths; Bristol Pauses Similar Trials Novartis halted CAR-T trials after three patient deaths, and Bristol paused its own similar trials as a precaution. This raises regulatory and safety worries for Bristol's CAR-T programs, adding uncertainty that can pressure the stock until the reviews clear.

  New safety event that directly affects BMY's CAR-T development and investor risk perception.

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  Arlo-cel Meets Primary Endpoint in Phase 2 Myeloma Trial Bristol's experimental CAR-T therapy arlo-cel met its main goal in a mid-stage myeloma trial, showing strong response rates in hard-to-treat patients. This is a potential first-in-class treatment that could become a future growth driver, boosting optimism about the pipeline.

  New positive clinical trial result that advances a potential new therapy for BMY.

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  Bristol Raises 2026 Revenue Guidance on Eliquis Strength Bristol raised full-year 2026 revenue guidance to $49–$50 billion from $46–$47.5 billion, after Eliquis sales grew 19% to $8.6 billion in the first half. The company now expects Eliquis growth of 20–25% for the year, up from 10–15%, and a smaller decline in older drugs. This directly boosts earnings expectations and investor confidence, pushing BMY shares up.

  This is the most significant new positive catalyst, directly raising revenue and profit outlook.

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  Bristol Partners with Chai Discovery on AI Antibody Discovery Bristol announced a collaboration with Chai Discovery to use AI and machine learning for discovering new therapeutic antibodies. This aims to speed up drug discovery and strengthen the pipeline, supporting long-term growth. While the impact is not immediate, it reinforces Bristol's commitment to innovation and could lead to new revenue streams, positively influencing investor sentiment.

  This new partnership shows Bristol's ongoing investment in AI to enhance pipeline, a key long-term growth driver.

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  Bristol to Invest $2.3 Billion in Houston Manufacturing Plant Bristol announced a $2.3 billion investment in a new Houston manufacturing campus, part of a larger $40 billion U.S. investment pledge. The plant will produce small-molecule medicines, biologics, and antibody-drug conjugates, creating jobs and expanding capacity. This move supports long-term supply chain resilience and may ease tariff pressures, positively affecting BMY's outlook.

  This new capital investment demonstrates commitment to U.S. manufacturing and could mitigate tariff risks, a positive for the stock.

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  Revived $6.7 Billion Celgene Lawsuit Adds Legal Uncertainty A federal appeals court reinstated a $6.7 billion lawsuit alleging Bristol delayed FDA approval of certain drugs to avoid paying contingent value rights to former Celgene shareholders. This brings renewed legal and financial uncertainty, potentially leading to a large cash payout and weighing on investor sentiment. The risk premium on BMY may increase, pressuring the stock price.

  This new legal development introduces a significant potential liability, a negative factor for the stock.

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  Q2 earnings beat and raised guidance Bristol reported Q2 revenue of $12.97 billion, beating estimates, and raised full-year guidance. Strong sales of Eliquis and newer drugs like Camzyos and Reblozyl drove the beat. This shows the growth portfolio is replacing lost older-drug sales faster than feared, boosting investor confidence and supporting the stock price.

  This is a major positive event that directly impacts BMY's financial outlook and investor confidence.

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  AstraZeneca merger talks called off After reports of merger talks, AstraZeneca's board decided to call them off, and Reuters reported no discussions ever took place. The potential takeover premium evaporated, removing a catalyst that had briefly lifted BMY shares. This leaves BMY to face its patent cliff alone, weighing on sentiment.

  The merger speculation was a key driver of BMY's stock movement, and its termination is a significant negative development.

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  FDA approves ZENBEXUS for multiple myeloma The FDA granted accelerated approval to ZENBEXUS, a first-in-class CELMoD therapy, for relapsed multiple myeloma. This new treatment offers a potential revenue stream to help offset losses from older drugs facing patent expirations, strengthening BMY's oncology portfolio and long-term growth prospects.

  This is a new product approval that directly addresses BMY's need to replace lost revenue from expiring patents.

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  Expanded AI partnerships for drug discovery Bristol expanded its partnership with Nvidia to build a next-generation AI supercomputer and struck a deal with Schrödinger to deploy its AI co-scientist Bunsen. These investments aim to speed up drug discovery and reduce costs, supporting long-term pipeline efficiency and innovation.

  These partnerships highlight BMY's commitment to technological innovation, which could improve future drug development and cost efficiency.

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  Q2 beat and raised full-year guidance Bristol reported roughly $13.0 billion in quarterly revenue, beating expectations by $1.23 billion, with cancer drugs driving growth. Adjusted earnings per share jumped about 40% to $2.04. Management raised full-year revenue and profit guidance above consensus, signaling the growth portfolio is replacing lost older-drug sales faster than feared.

  This is the core fundamental news of the period and directly supports a higher valuation for BMY.

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  Reported AstraZeneca merger talks boost BMY shares The Financial Times and other outlets reported preliminary merger discussions between AstraZeneca and Bristol-Myers Squibb that could create a nearly $400 billion drugmaker. BMY shares rose about 8% in premarket trading before fading to near flat, as investors saw a possible takeover premium but also big antitrust hurdles and doubts a deal gets done.

  This is the single biggest new event moving BMY's stock this period and explains the sharp price reaction.

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  Deal skepticism and antitrust concerns cap the rally AstraZeneca shares fell about 9% while BMY's early 8% gain faded to near flat, showing the market doubts the deal's value and feasibility. Analysts flagged direct competition in lung cancer between Opdivo and Imfinzi, and estimated neither company has the standalone financial firepower to buy the other outright. A deal may never happen.

  It is the essential counterweight to the merger headline and explains why BMY's initial surge did not hold.

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  Cytokinetics launches Myqorzo, competing with Camzyos Cytokinetics launched Myqorzo in the U.S. and Germany for the same heart condition Camzyos treats. With over 275 prescribers already, this new rival could steal Camzyos sales, weighing on BMY's revenue growth.

  This is a new competitive threat that directly pressures a key BMY drug.

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  Trump administration drug-pricing deals include Bristol Myers Squibb Bristol agreed to voluntary most-favored-nation pricing, aligning some U.S. drug prices with lower prices abroad. With top sellers like Revlimid and Eliquis already facing patent expirations, this makes replacing lost revenue even harder.

  This is a new pricing agreement that directly affects BMY's revenue outlook.

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  FDA accepts mezigdomide application for multiple myeloma The FDA accepted Bristol's application for mezigdomide in relapsed multiple myeloma, with a decision expected by May 2027. The drug showed strong trial results, offering a potential new treatment to help offset lost sales from older drugs.

  This is a new regulatory milestone that advances a promising pipeline drug.

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  Bristol expands AI drug discovery with NVIDIA and new San Diego hub Bristol is building the most powerful AI supercomputer in life sciences with NVIDIA and opened a 427,000-square-foot San Diego research hub. These investments aim to speed up drug discovery and improve pipeline efficiency, supporting long-term growth.

  These new technology investments could enhance BMY's ability to develop new drugs faster.

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  Three pipeline wins in two weeks Bristol reported positive late-stage results for three experimental drugs: SUCCESSOR-2 in multiple myeloma, izalontamab brengitecan in breast and esophageal cancer, and a CAR-T therapy with a 96% response rate. New treatments help replace sales lost as older drugs face cheaper copies.

  This is the main new force lifting BMY: fresh pipeline data that can offset patent losses.

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  Congress probes China trials A House committee opened an investigation into Bristol over clinical trials at Chinese military hospitals and in Xinjiang. This adds legal and reputational risk, and could lead to restrictions or penalties, which weighs on the stock.

  It is a new regulatory threat that could hurt BMY's reputation and operations.

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  Medicare price negotiation risk Proposed changes would make Medicare drug price negotiation permanent from 2029 and tighten rules on fixed-combination drugs. This could pressure future U.S. prices for some Bristol medicines, though legal challenges and a broad product mix may soften the blow.

  It flags a new pricing risk that could lower BMY's future revenue.

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  Roche rival beats Krazati Roche's divarasib outperformed Bristol's Krazati in a Phase III lung cancer trial, meeting survival goals. This competitive threat could erode Krazati's market share and future sales, a negative for BMY.

  It shows a new competitive loss that could reduce BMY's oncology revenue.

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