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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 NYSEAMERICAN:ASTNYSEAMERICAN:HEBNASDAQ:KLDOOTCMKTS:RSPID 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 VolumeASTAsterias Biotherapeutics$0.00$0.00$0.51▼$2.05$111KN/A136,653 shs1,000 shsHEBHemispherx BioPharma$6.70-20.0%$1.61$1.69▼$14.81$16.36MN/A102,599 shs7,639 shsKLDOKaleido Biosciences$0.00$0.00▼$0.07$4K-0.069,185 shsN/ARSPIDRespireRx Pharmaceuticals$0.00$0.00$0.01▼$1.50$43K0.15928,930 shsN/A20 High-Yield Dividend Stocks that Could Ruin Your RetirementAlmost everyone loves strong dividend-paying stocks, but high yields can signal danger. Discover 20 high-yield dividend stocks paying an unsustainably large percentage of their earnings. Enter your email to get this report and avoid a high-yield dividend trap.Get This Free ReportCompare Price PerformanceCompany1-Day Performance7-Day Performance30-Day Performance90-Day Performance1-Year PerformanceASTAsterias Biotherapeutics0.00%0.00%0.00%0.00%0.00%HEBHemispherx BioPharma0.00%0.00%+6,960.06%+5,437.19%+1,697.69%KLDOKaleido Biosciences0.00%0.00%0.00%-90.00%0.00%RSPIDRespireRx Pharmaceuticals0.00%-60.00%-60.00%-66.67%-85.00%Compare MarketRank™CompanyOverall ScoreAnalyst's OpinionShort Interest ScoreDividend StrengthESG ScoreNews and Social Media SentimentCompany OwnershipEarnings & ValuationASTAsterias BiotherapeuticsN/AN/AN/AN/AN/AN/AN/AN/AHEBHemispherx BioPharmaN/AN/AN/AN/AN/AN/AN/AN/AKLDOKaleido BiosciencesN/AN/AN/AN/AN/AN/AN/AN/ARSPIDRespireRx PharmaceuticalsN/AN/AN/AN/AN/AN/AN/AN/ACompare Analyst ForecastsCompanyConsensus Rating ScoreConsensus RatingConsensus Price Target% Upside from Current PriceASTAsterias Biotherapeutics 0.00N/AN/AN/AHEBHemispherx BioPharma 0.00N/AN/AN/AKLDOKaleido Biosciences 0.00N/AN/AN/ARSPIDRespireRx Pharmaceuticals 0.00N/AN/AN/ACompare Sales & Book ValueCompanyAnnual RevenuePrice/SalesCashflowPrice/CashBook ValuePrice/BookASTAsterias BiotherapeuticsN/AN/AN/AN/AN/AN/AHEBHemispherx BioPharmaN/AN/AN/AN/AN/AN/AKLDOKaleido Biosciences$1.10M0.00N/AN/AN/ANaNRSPIDRespireRx PharmaceuticalsN/AN/AN/AN/AN/AN/ACompare Profitability & EarningsCompanyNet IncomeEPSTrailing P/E RatioForward P/E RatioP/E GrowthNet MarginsReturn on Equity (ROE)Return on Assets (ROA)Next Earnings DateASTAsterias BiotherapeuticsN/AN/A0.00∞N/AN/AN/AN/AN/AHEBHemispherx BioPharmaN/AN/A0.00∞N/AN/AN/AN/AN/AKLDOKaleido BiosciencesN/A-$2.24N/AN/AN/AN/AN/AN/AN/ARSPIDRespireRx PharmaceuticalsN/A-$3.20N/A∞N/AN/AN/AN/AN/ACompare DividendsCompanyAnnual PayoutDividend Yield3-Year Dividend GrowthPayout RatioYears of Consecutive GrowthASTAsterias BiotherapeuticsN/AN/AN/AN/AN/AHEBHemispherx BioPharmaN/AN/AN/AN/AN/AKLDOKaleido BiosciencesN/AN/AN/AN/AN/ARSPIDRespireRx PharmaceuticalsN/AN/AN/AN/AN/ACompare OwnershipInstitutional OwnershipCompanyInstitutional OwnershipASTAsterias BiotherapeuticsN/AHEBHemispherx BioPharmaN/AKLDOKaleido Biosciences81.56%RSPIDRespireRx PharmaceuticalsN/AInsider OwnershipCompanyInsider OwnershipASTAsterias BiotherapeuticsN/AHEBHemispherx BioPharmaN/AKLDOKaleido Biosciences9.00%RSPIDRespireRx Pharmaceuticals50.03%Compare Miscellaneous StatsCompanyEmployeesShares OutstandingFree FloatOptionableASTAsterias BiotherapeuticsN/A55.66 millionN/ANot OptionableHEBHemispherx BioPharma312.44 millionN/ANot OptionableKLDOKaleido Biosciences8042.62 million38.79 millionNot OptionableRSPIDRespireRx Pharmaceuticals272.27 millionN/ANot OptionableAST, HEB, KLDO, and RSPID HeadlinesRecent News About These CompaniesNo headlines for this company have been tracked by MarketBeat.comMedia Sentiment Over TimeTop HeadlinesView All Headlines3 Semiconductor Stocks Poised to Surge on AI SpendingBy Chris Markoch | June 25, 2025View 3 Semiconductor Stocks Poised to Surge on AI Spending3 AI Infrastructure Stocks With Strong Growth, Not HypeBy Chris Markoch | June 26, 2025View 3 AI Infrastructure Stocks With Strong Growth, Not Hype3 Penny Stocks Analysts Believe Are Headed HigherBy Chris Markoch | June 4, 2025View 3 Penny Stocks Analysts Believe Are Headed HigherAST SpaceMobile’s Star Is Rising: Get in While It’s Still Cheap!By Thomas Hughes | June 16, 2025View AST SpaceMobile’s Star Is Rising: Get in While It’s Still Cheap!Why Nebius Group Is One of the Top AI Stocks to WatchBy Thomas Hughes | June 17, 2025View Why Nebius Group Is One of the Top AI Stocks to WatchAST, HEB, KLDO, and RSPID Company DescriptionsAsterias Biotherapeutics NYSEAMERICAN:AST$0.0020 0.00 (0.00%) As of 07/10/2019Asterias Biotherapeutics, Inc., a clinical-stage biotechnology company, focuses on developing cell-based therapeutics to treat neurological conditions associated with demyelination, and cellular immunotherapies to treat cancer. Its clinical stage programs include AST-OPC1, an oligodendrocyte progenitor cell population derived from pluripotent stem cells that is in Phase I/IIa clinical trial for spinal cord injuries; AST-VAC2 is a non-patient-specific cancer immunotherapy derived from pluripotent stem cells for the treatment of non-small cell lung cancer; and AST-VAC1, a patient-specific cancer immunotherapy that has completed Phase II clinical trial for the treatment of acute myeloid leukemia. The company was formerly known as BioTime Acquisition Corporation and changed its name to Asterias Biotherapeutics, Inc. in March 2013. Asterias Biotherapeutics, Inc. was founded in 2012 and is headquartered in Fremont, California.Hemispherx BioPharma NYSEAMERICAN:HEB$6.70 -1.68 (-20.05%) As of 06/13/2025Hemispherx Biopharma, Inc., a specialty pharmaceutical company, engages in the clinical development of drug therapies based on natural immune system enhancing technologies for the treatment of viral and immune based chronic disorders in the United States. The company's products include Alferon N Injection, an injectable formulation of natural alpha interferon to treat a category of genital warts, a sexually transmitted disease; and Ampligen for the treatment of chronic fatigue syndrome (CFS). It is also developing Ampligen for the treatment of CFS, Hepatitis B, HIV, and cancer patients with renal cell carcinoma and malignant melanoma. The company was founded in 1990 and is headquartered in Orlando, Florida.Kaleido Biosciences NASDAQ:KLDOKaleido Biosciences, Inc., a clinical-stage healthcare company, develops microbiome metabolic therapies. The company develops KB195 for the treatment of patients with urea cycle disorder; KB295 to treat ulcerative colitis; KB174 for the treatment of hepatic encephalopathy; and KB109 to treat COVID-19 disease. It also develops programs for the treatment of multi drug resistant infection, chronic kidney disease, atherosclerotic cardiovascular disease, cardio-metabolic syndrome, immuno-oncology, and inflammatory bowel diseases. The company has collaboration agreements with Institute Gustave Roussy, Washington University, and Janssen. Kaleido Biosciences, Inc. was incorporated in 2015 and is headquartered in Lexington, Massachusetts.RespireRx Pharmaceuticals OTCMKTS:RSPID$0.0006 0.00 (0.00%) As of 06/27/2025RespireRx Pharmaceuticals Inc. engages in the discovery and development of pharmaceuticals for the treatment of respiratory disorders. It has two drug platforms comprising ampakines, which are small molecule compounds to enhance the excitatory actions of the neurotransmitter glutamate at the alpha-amino-3-hydroxy-5-methyl-4-isoxazolepropionic acid (AMPA) receptor complex; and cannabinoids, primarily dronabinol, a synthetic derivative for use in refractory chemotherapy-induced nausea and vomiting, as well as for anorexia in patients with AIDS. The company's lead ampakine, CX1739, which is in Phase II clinical studies for drug-induced respiratory depression (RD), as well as for central sleep apnea. It is also developing CX717, CX1739, and CX1942 that have clinical application in the treatment of CNS-driven respiratory disorders, neurobehavioral disorders, spinal cord injury, neurological diseases, and orphan indications. The company was formerly known as Cortex Pharmaceuticals, Inc. and changed its name to RespireRx Pharmaceuticals Inc. in December 2015. RespireRx Pharmaceuticals Inc. was founded in 1987 and is headquartered in Glen Rock, New Jersey. 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