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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:ASTOTCMKTS:DDXSNYSEAMERICAN:HEBOTCMKTS: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 shsDDXSDiadexus$0.00$0.01▼$5.40$53KN/A15,481 shs30 shsHEBHemispherx BioPharma$0.14$1.69▼$14.81$232KN/A102,599 shs2.31 million shsRSPIDRespireRx Pharmaceuticals$0.00+11.1%$0.00$0.01▼$1.50$145K0.15928,930 shs2.00 million 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 PerformanceASTAsterias Biotherapeutics0.00%0.00%0.00%0.00%0.00%DDXSDiadexus0.00%0.00%0.00%0.00%0.00%HEBHemispherx BioPharma0.00%0.00%0.00%-20.98%-73.78%RSPIDRespireRx Pharmaceuticals+33.33%+33.33%0.00%0.00%-27.54%Compare MarketRank™CompanyOverall ScoreAnalyst's OpinionShort Interest ScoreDividend StrengthESG ScoreNews and Social Media SentimentCompany OwnershipEarnings & ValuationASTAsterias BiotherapeuticsN/AN/AN/AN/AN/AN/AN/AN/ADDXSDiadexusN/AN/AN/AN/AN/AN/AN/AN/AHEBHemispherx BioPharmaN/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/ADDXSDiadexus 0.00N/AN/AN/AHEBHemispherx BioPharma 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/ADDXSDiadexusN/AN/AN/AN/AN/AN/AHEBHemispherx BioPharmaN/AN/AN/AN/AN/AN/ARSPIDRespireRx 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/ADDXSDiadexusN/AN/A0.00N/AN/AN/AN/AN/AN/AHEBHemispherx BioPharmaN/AN/A0.00N/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/ADDXSDiadexusN/AN/AN/AN/AN/AHEBHemispherx BioPharmaN/AN/AN/AN/AN/ARSPIDRespireRx PharmaceuticalsN/AN/AN/AN/AN/ACompare OwnershipInstitutional OwnershipCompanyInstitutional OwnershipASTAsterias BiotherapeuticsN/ADDXSDiadexusN/AHEBHemispherx BioPharmaN/ARSPIDRespireRx PharmaceuticalsN/AInsider OwnershipCompanyInsider OwnershipASTAsterias BiotherapeuticsN/ADDXSDiadexusN/AHEBHemispherx BioPharmaN/ARSPIDRespireRx Pharmaceuticals50.03%Compare Miscellaneous StatsCompanyEmployeesShares OutstandingFree FloatOptionableASTAsterias BiotherapeuticsN/A55.66 millionN/ANot OptionableDDXSDiadexusN/A4.10 millionN/ANot OptionableHEBHemispherx BioPharma312.44 millionN/ANot OptionableRSPIDRespireRx Pharmaceuticals272.27 millionN/ANot OptionableAST, HEB, DDXS, and RSPID HeadlinesRecent News About These CompaniesNo headlines for this company have been tracked by MarketBeat.comTop HeadlinesView All HeadlinesBullish NVIDIA Market Set to Surge 50% Ahead of Q1 EarningsBy Thomas Hughes | May 27, 2025View Bullish NVIDIA Market Set to Surge 50% Ahead of Q1 EarningsNVIDIA Stock Surges on Bullish News: How High Could It Climb?By Thomas Hughes | May 13, 2025View NVIDIA Stock Surges on Bullish News: How High Could It Climb?3 Penny Stocks Analysts Believe Are Headed HigherBy Chris Markoch | June 4, 2025View 3 Penny Stocks Analysts Believe Are Headed HigherNVIDIA’s AI Robot Leap: 2 Stocks Set to Ride the WaveBy Nathan Reiff | May 23, 2025View NVIDIA’s AI Robot Leap: 2 Stocks Set to Ride the WaveAnalysts and Institutions Continue to Bet Big on AlphabetBy Ryan Hasson | May 16, 2025View Analysts and Institutions Continue to Bet Big on AlphabetAST, HEB, DDXS, 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.Diadexus OTCMKTS:DDXSDiadexus, Inc. engages in the research, development, and commercialization of pharmaceutical products. Its portfolio intends to treat cardiovascular diseases. The company was founded on November 27, 1995 and is headquartered in South San Francisco, CA.Hemispherx BioPharma NYSEAMERICAN:HEBHemispherx 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.RespireRx Pharmaceuticals OTCMKTS:RSPID$0.0020 +0.00 (+11.11%) As of 06/6/2025RespireRx 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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