Compare Stocks Compare stocks with our powerful stock comparison tool. Analyze fundamentals, price performance, and key financial indicators to make informed investment decisions. Our tool lets you compare up to ten stocks side by side based on Performance Charts, Price & Volume, MarketRank™, Analyst Ratings, Sales & Book Value, Profitability & Earnings, Dividends, Debt, Ownership, Headlines, and more. Simply enter up to ten stock symbols (e.g., BAC, JPM, WFC, C, GS) to get started and uncover top investment opportunities. Stocks to Compare Sections All Sections Selected Performance Chart Price & Volume MarketRank Analyst Ratings Sales & Book Value Profitability & Earnings Dividends Debt Ownership Miscellaneous Headlines About Compare NASDAQ:ATHXNASDAQ:PPBTNASDAQ:SILONASDAQ:SNPX On This Page Performance ChartPrice & VolumeMarketRank™Analyst RatingsSales & Book ValueProfitability & EarningsDividendsDebtOwnershipMiscellaneousHeadlinesAbout Comparison Ideas Stock Ideas Comparative Price Performance Over Time1 day7 days30 days90 days365 daysCompare Price & VolumeCompanyCurrent Price50-Day Moving Average52-Week RangeMarket CapBetaAvg. VolumeToday's VolumeATHXAthersys$0.00$0.01▼$1.99$833K-0.91.77 million shs1,000 shsPPBTPurple Biotech$2.21-1.3%$2.63$2.00▼$20.60$2.94M0.57269,772 shs55,821 shsSILOSilo Pharma$0.81+0.5%$1.12$0.71▼$4.50$3.65M0.372.18 million shs76,393 shsSNPXSynaptogenix$2.45+3.8%$2.45$1.84▼$5.09$3.41M1.0623,413 shs3,410 shsTen Starter Stocks For Beginners to Buy NowJust getting into the stock market? These 10 simple stocks can help beginning investors build long-term wealth without knowing options, technicals, or other advanced strategies.Get This Free ReportCompare Price PerformanceCompany1-Day Performance7-Day Performance30-Day Performance90-Day Performance1-Year PerformanceATHXAthersys0.00%0.00%0.00%0.00%-78.26%PPBTPurple Biotech0.00%-6.67%-10.04%-31.71%+223,999,900.00%SILOSilo Pharma-0.74%+8.00%-20.59%-51.20%-52.63%SNPXSynaptogenix+2.28%-0.21%+20.65%-20.75%-48.18%Compare MarketRank™CompanyOverall ScoreAnalyst's OpinionShort Interest ScoreDividend StrengthESG ScoreNews and Social Media SentimentCompany OwnershipEarnings & ValuationATHXAthersysN/AN/AN/AN/AN/AN/AN/AN/APPBTPurple Biotech2.0658 of 5 stars3.55.00.00.00.60.00.6SILOSilo Pharma0.3764 of 5 stars0.04.00.00.00.60.00.6SNPXSynaptogenix2.4281 of 5 stars3.55.00.00.00.00.00.6Compare Analyst ForecastsCompanyConsensus Rating ScoreConsensus RatingConsensus Price Target% Upside from Current PriceATHXAthersys 0.00N/AN/AN/APPBTPurple Biotech 3.00Buy$33.001,393.21% UpsideSILOSilo Pharma 0.00N/AN/AN/ASNPXSynaptogenix 3.00Buy$14.00471.43% UpsideCurrent Analyst Ratings BreakdownCompare Sales & Book ValueCompanyAnnual RevenuePrice/SalesCashflowPrice/CashBook ValuePrice/BookATHXAthersys$146K0.00N/AN/A($1.33) per share0.00PPBTPurple BiotechN/AN/AN/AN/A$27.18 per shareN/ASILOSilo Pharma$72.10K50.62N/AN/A$2.14 per share0.38SNPXSynaptogenixN/AN/AN/AN/A$25.27 per shareN/ACompare Profitability & EarningsCompanyNet IncomeEPSTrailing P/E RatioForward P/E RatioP/E GrowthNet MarginsReturn on Equity (ROE)Return on Assets (ROA)Next Earnings DateATHXAthersys-$72.53M-$2.03N/AN/AN/AN/AN/A-223.03%N/APPBTPurple Biotech-$19.88M-$5.25N/AN/AN/AN/A-55.86%-44.67%5/20/2025 (Estimated)SILOSilo Pharma-$3.70M-$1.22N/A∞N/A-5,255.05%-61.38%-47.49%5/12/2025 (Estimated)SNPXSynaptogenix-$6.04M-$10.53N/A∞N/AN/A-42.14%-29.42%5/21/2025 (Estimated)Latest ATHX, SILO, SNPX, and PPBT EarningsDateQuarterCompanyConsensus EstimateReported EPSBeat/MissGap EPSRevenue EstimateActual RevenueDetails3/28/2025Q4 2024SILOSilo PharmaN/A-$0.41N/A-$0.41N/A$0.02 million3/27/2025Q4 2024SNPXSynaptogenix-$2.06-$4.36-$2.30-$4.36N/AN/A3/10/2025Q4 2024PPBTPurple Biotech-$0.22-$0.26-$0.04-$0.26N/AN/ACompare DividendsCompanyAnnual PayoutDividend Yield3-Year Dividend GrowthPayout RatioYears of Consecutive GrowthATHXAthersysN/AN/AN/AN/AN/APPBTPurple BiotechN/AN/AN/AN/AN/ASILOSilo PharmaN/AN/AN/AN/AN/ASNPXSynaptogenixN/AN/AN/AN/AN/ACompare DebtCompanyDebt-to-Equity RatioCurrent RatioQuick RatioATHXAthersysN/A0.060.06PPBTPurple BiotechN/A1.271.27SILOSilo PharmaN/A7.917.91SNPXSynaptogenixN/A65.3465.34Compare OwnershipInstitutional OwnershipCompanyInstitutional OwnershipATHXAthersys19.35%PPBTPurple Biotech9.64%SILOSilo Pharma5.58%SNPXSynaptogenix10.34%Insider OwnershipCompanyInsider OwnershipATHXAthersys0.03%PPBTPurple Biotech2.98%SILOSilo Pharma4.37%SNPXSynaptogenix2.73%Compare Miscellaneous StatsCompanyEmployeesShares OutstandingFree FloatOptionableATHXAthersys2461.72 million61.70 millionNo DataPPBTPurple Biotech201.33 million1.29 millionOptionableSILOSilo Pharma24.48 million4.29 millionNot OptionableSNPXSynaptogenix41.39 million1.32 millionNot OptionableATHX, SILO, SNPX, and PPBT HeadlinesRecent News About These CompaniesSynaptogenix Inc Ordinary SharesJanuary 3, 2025 | morningstar.comSynaptogenix Board of Directors Forms Special Committee to Explore Value Creation Opportunities Utilizing Balance Sheet StrengthDecember 20, 2024 | prnewswire.comSynaptogenix (NASDAQ:SNPX) Stock Quotes, Forecast and News SummaryOctober 7, 2024 | benzinga.comSynaptogenix secures $5 million in preferred stock financingSeptember 13, 2024 | investing.comSynaptogenix Announces $5.0 Million FinancingSeptember 11, 2024 | prnewswire.comSNPX Stock Earnings: Synaptogenix Reported Results for Q2 2024August 16, 2024 | investorplace.comSynaptogenix Partners With LSU Health New Orleans To Study PUFA Analogs To Treat Spinal Cord InjuryJuly 19, 2024 | markets.businessinsider.comSynaptogenix Announces New Collaboration with LSU Health New Orleans for Study of Proprietary Analogs in Spinal Cord InjuryJuly 18, 2024 | prnewswire.comSynaptogenix Announces FDA Authorization of IND Application for Clinical Trial for Bryostatin-1 in Multiple SclerosisJune 26, 2024 | prnewswire.comSNPX Stock Earnings: Synaptogenix Reported Results for Q1 2024May 20, 2024 | investorplace.comSynaptogenix Applauds DEA Proposal to Reclassify Cannabis and Shares Expected Benefits to Cannasoul for Cannabinoid-Based Drug DiscoveryMay 7, 2024 | prnewswire.comSynaptogenix, Inc.: Synaptogenix Regains Compliance with Nasdaq Minimum Bid Price Requirement for Continued ListingApril 24, 2024 | finanznachrichten.deSynaptogenix Regains Compliance with Nasdaq Minimum Bid Price Requirement for Continued ListingApril 24, 2024 | prnewswire.comSynaptogenix announces reverse stock split to regain Nasdaq complianceApril 5, 2024 | uk.investing.comWhat's Going On With Synaptogenix (SNPX) Stock?April 4, 2024 | msn.comSynaptogenix Announces Reverse Stock Split to Maintain Nasdaq ListingApril 3, 2024 | finance.yahoo.comU.S. shares higher at close of trade; Dow Jones Industrial Average up 1.18%February 22, 2024 | msn.comSynaptogenix President Daniel L. Alkon, M.D. Honored for Scientific Presentation at USC-Sponsored Forum on Age-Related Diseases and Neurodegenerative DisordersDecember 19, 2023 | finance.yahoo.comSynaptogenix Joins Leading Neuroscientists and Academics as Speaker at USC-Sponsored Forum on Age-Related Diseases including Alzheimer'sDecember 6, 2023 | finance.yahoo.comSynaptogenix Acquires Significant Stake in Cannasoul Analtyics Ltd. Co-founded by The Technion - Israel Institute of TechnologyNovember 2, 2023 | finance.yahoo.comNew MarketBeat Followers Over TimeMedia Sentiment Over TimeATHX, SILO, SNPX, and PPBT Company DescriptionsAthersys NASDAQ:ATHXAthersys, Inc., a biotechnology company, focuses on the research and development activities in the field of regenerative medicine. Its clinical development programs are focused on treating neurological conditions, cardiovascular diseases, inflammatory and immune disorders, and pulmonary and other conditions. The company's lead platform product includes MultiStem cell therapy, an allogeneic stem cell product for the treatment of patients suffering from neurological damage from an ischemic stroke, as well as for acute respiratory distress syndrome, trauma complications, HSC transplant support, and other indications. It also develops MultiStem cell therapy to promote tissue repair and healing for animal patients. The company has license and collaboration agreements with Healios K.K. to develop and commercialize MultiStem cell therapy for ischemic stroke, acute respiratory distress syndrome, and ophthalmological indications, as well as for the treatment of liver, kidney, pancreas, and intestinal tissue diseases; and the University of Minnesota to develop MultiStem cell therapy platform. The company was founded in 1995 and is headquartered in Cleveland, Ohio.Purple Biotech NASDAQ:PPBT$2.21 -0.03 (-1.34%) Closing price 03:49 PM EasternExtended Trading$2.26 +0.05 (+2.08%) As of 07:42 PM Eastern Extended trading is trading that happens on electronic markets outside of regular trading hours. This is a fair market value extended hours price provided by Polygon.io. Learn more.Purple Biotech Ltd., a clinical-stage company, focuses on developing therapies to overcome tumor immune evasion and drug resistance for cancer patients in the United States. Its oncology pipeline includes CM24, a humanized monoclonal antibody that blocks the interactions of carcinoembryonic antigen related cell adhesion molecule 1 as a combination therapy with anti-PD-1 checkpoint inhibitors, which is in Phase 2 clinical trial for the treatment of pancreatic ductal adenocarcinoma; NT219, a small molecule that targets and inhibits insulin receptor substrate 1 and 2, and signal transducer and activator of transcription, which is in Phase 1/2 clinical trials for the treatment recurrent and/or metastatic squamous cell carcinoma of the head and neck cancer or colorectal adenocarcinoma; and IM1240, a multi-valent antibody designed to activate anti-tumoral immune response against 5T4-positive tumors, which is in preclinical stage. The company has collaboration agreement with Bristol Myers Squibb Company to evaluate the combination of CM24 with the PD-1 inhibitor nivolumab in addition to chemotherapy. The company was formerly known as Kitov Pharma Ltd and changed its name to Purple Biotech Ltd. in December 2020. The company is headquartered in Rehovot, Israel.Silo Pharma NASDAQ:SILO$0.81 +0.00 (+0.49%) Closing price 03:51 PM EasternExtended Trading$0.82 +0.01 (+1.11%) As of 07:46 PM Eastern Extended trading is trading that happens on electronic markets outside of regular trading hours. This is a fair market value extended hours price provided by Polygon.io. Learn more.Silo Pharma Inc. operates as a developmental stage biopharmaceutical company. The company is developing therapeutics that address underserved conditions, including stress-induced psychiatric disorders, chronic pain conditions, and central nervous system (CNS) diseases. It focuses on developing traditional therapies and psychedelic treatments in formulations and drug delivery systems. The company's lead program, SPC-15, is an intranasal treatment targeting PTSD and stress-induced anxiety disorders. It is also developing SP-26, a time-release ketamine-loaded implant for fibromyalgia and chronic pain relief. In addition, the company's two preclinical programs comprise SPC-14, an intranasal compound for the treatment of Alzheimer's disease, and SPU-16, a CNS-homing peptide targeting multiple sclerosis (MS). The company's research and development programs are conducted through collaborations with Columbia University and the University of Maryland, Baltimore. The company was formerly known as Uppercut Brands, Inc. and changed its name to Silo Pharma, Inc. in September 2020. Silo Pharma, Inc. was incorporated in 2010 and is based in Sarasota, Florida.Synaptogenix NASDAQ:SNPX$2.45 +0.09 (+3.81%) As of 04:00 PM Eastern This is a fair market value price provided by Polygon.io. Learn more.Synaptogenix, Inc. operates as a biopharmaceutical company with product candidates in pre-clinical and clinical development. The company focuses on developing a product platform based upon a drug candidate called Bryostatin-1 for the treatment of Alzheimer's disease. It also evaluates therapeutic applications of bryostatin for other neurodegenerative or cognitive diseases and dysfunctions, such as fragile X syndrome, multiple sclerosis, and Niemann-pick type C disease. The company was incorporated in 2012 and is headquartered in New York, New York. 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