Alnylam Pharmaceuticals (ALNY) Stock Chart & Stock Price History $297.45 -3.06 (-1.02%) Closing price 05/22/2026 04:00 PM EasternExtended Trading$298.91 +1.46 (+0.49%) As of 05/22/2026 07:29 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 Massive. Learn more. Add Compare Share Share Chart Stock AnalysisAnalyst ForecastsChartCompetitorsEarningsFDA EventsFinancialsHeadlinesInsider TradesOptions ChainOwnershipSEC FilingsShort InterestTrendsBuy This Stock Alnylam Pharmaceuticals Stock Price Performance The Alnylam Pharmaceuticals (ALNY) stock chart highlights key performance trends across multiple timeframes. Over the last 12 months, the stock's price has increased 2.58%, with a year-to-date return of -25.20%. In the past month, the stock has decreased 5.21%, reflecting recent market activity. As of the latest close, Alnylam Pharmaceuticals traded at $297.45 with a market cap of $39.71 billion and volume of 681,280 shares. Five years ago, the stock traded at $140.06, representing a 112.37% increase over that period. At the time, it had a market cap of $16.46 billion and a volume of 328,349 shares. Receive ALNY Stock News and Ratings via EmailSign-up to receive the latest news and ratings for Alnylam Pharmaceuticals and its competitors with MarketBeat's FREE daily newsletter. Subscribe Now View SMS TermsSMS is currently available in Australia, Belgium, Canada, France, Germany, Ireland, Italy, New Zealand, the Netherlands, Singapore, South Africa, Spain, Switzerland, the United Kingdom, and the United States. By entering your phone number and clicking the sign-up button, you agree to receive periodic text messages from MarketBeat at the phone number you submitted, including texts that may be sent using an automatic telephone dialing system. Message and data rates may apply. 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Read our full terms of service and privacy policy. 5 Day Performance+3.91%1 Month Performance-5.21%3 Month Performance-9.69%Year-To-Date Performance-25.20%1 Year Performance+2.58%5 Year Performance+112.37% ALNY Stock Chart for Saturday, May, 23, 2026 ALNY Chart by TradingView Alnylam Pharmaceuticals Stock Price History Daily Weekly Monthly Yearly Time Frame Custom Range 1 Month 3 Months 6 Months Year-to-Date 1 Year 3 Year 5 Year Time Frame Start Date End Date Export DateOpening PriceClosing PriceHighLowVolumeMarket Capitalization05/22/2026$300.51$297.45-1.02%$303.33$294.99681,280 shs$39.71 billion05/21/2026$298.48$300.51+0.68%$301.43$293.00650,230 shs$40.12 billion05/20/2026$294.30$298.48+1.42%$300.08$292.10799,212 shs$39.85 billion05/19/2026$286.27$294.30+2.81%$294.93$284.38769,853 shs$39.29 billion05/18/2026$286.98$286.27-0.25%$291.97$285.26873,360 shs$38.22 billion05/15/2026$293.45$286.98-2.20%$298.00$286.761.15 million shs$38.31 billion05/14/2026$291.48$293.45+0.68%$297.00$287.51889,661 shs$39.18 billion05/13/2026$292.03$291.48-0.19%$298.38$288.56975,712 shs$38.92 billion05/12/2026$284.84$292.03+2.52%$295.86$286.73826,106 shs$38.99 billion05/11/2026$295.05$284.84-3.46%$296.37$284.281.29 million shs$38.03 billion Get the Latest News and Ratings for ALNY and Related StocksEnter your email address below to receive the latest news and analysts' ratings for Alnylam Pharmaceuticals and its competitors with MarketBeat's FREE daily newsletter. 05/08/2026$295.91$295.05-0.29%$300.17$293.06926,759 shs$39.51 billion05/07/2026$303.00$295.91-2.34%$303.46$293.781.14 million shs$39.51 billion05/06/2026$301.11$303.00+0.63%$306.03$298.961.01 million shs$40.45 billion05/05/2026N/A$301.11$302.67$295.02823,883 shs$40.18 billion04/30/2026$301.19$309.49+2.76%$317.56$287.002.19 million shs$41.29 billion04/29/2026$302.11$301.19-0.30%$304.22$294.061.57 million shs$40.19 billion04/28/2026$308.51$302.11-2.07%$314.17$301.80996,095 shs$40.31 billion04/27/2026$305.54$308.51+0.97%$314.74$303.701.09 million shs$41.16 billion04/24/2026$313.79$305.54-2.63%$311.10$302.89825,594 shs$40.77 billion04/23/2026$310.58$313.79+1.03%$315.83$310.79586,047 shs$41.87 billion04/22/2026$308.43$310.58+0.70%$312.69$307.851.00 million shs$41.44 billion Related Companies Vertex Pharmaceuticals Stock Price Chart Regeneron Pharmaceuticals Stock Price Chart Biogen Stock Price Chart United Therapeutics Stock Price Chart Incyte Stock Price Chart Neurocrine Biosciences Stock Price Chart Exelixis Stock Price Chart Ionis Pharmaceuticals Stock Price Chart Madrigal Pharmaceuticals Stock Price Chart BioMarin Pharmaceutical Stock Price Chart Receive ALNY Stock News and Ratings via EmailSign-up to receive the latest news and ratings for Alnylam Pharmaceuticals and its competitors with MarketBeat's FREE daily newsletter. This page (NASDAQ:ALNY) was last updated on 5/23/2026 by MarketBeat.com Staff. 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