Altimmune, Inc. (ALT) Stock Chart
ALT price chart
Daily prices adjusted for splits and dividends. 1D and 5D show delayed intraday prices. Markers: E earnings, D dividend, S split.
Technical snapshot
Key levels & statistics
ALT performance vs the market
Total return, dividends reinvestedALT monthly returns
ALT historical prices
ALT dividends & splits
About the ALT chart
Altimmune (ALT) closed at $2.20 on October 16, 2026, down 39.1% so far this year. The stock is trading 34.8% below its 200-day moving average of $3.37, which technical analysts usually read as a long-term downtrend. Over the past year ALT returned −43.4% including dividends, behind the S&P 500 (+16.8%).
This page charts the full trading history of Altimmune, Inc. stock. Daily prices come from EODHD and are adjusted for stock splits and dividends, so returns over long periods are comparable. For the latest quote, company profile, earnings and news, see the ALT stock overview.
ALT chart FAQ
What is Altimmune's all-time high stock price?
The highest closing price for ALT was $133.20 on May 26, 2017 (adjusted for stock splits). As of the October 16, 2026 close it traded 98.3% below that level.
What is the 52-week range of ALT stock?
Over the 52 weeks to October 16, 2026, ALT traded between an intraday low of $2.17 on October 16, 2026 and an intraday high of $6.44 on January 23, 2026.
Is ALT above its 200-day moving average?
No. On October 16, 2026 ALT closed at $2.20, 34.8% below its 200-day simple moving average of $3.37. The 50-day average was $3.00.
How has ALT stock performed compared with the S&P 500?
Including reinvested dividends, ALT returned −43.4% over the past year, compared with +16.8% for the S&P 500 (SPY). Over five years the figures were −81.7% and +83.0%.
Does Altimmune pay a dividend?
Altimmune has not paid a dividend in the past 12 months.
Has ALT stock ever split?
ALT has split its stock 1 time: 1:30 (September 14, 2018). Prices on this chart are adjusted for all splits.
How do I read the ALT chart?
Pick a time range above the chart and choose candlesticks, a line or an area chart. Moving averages, Bollinger Bands, volume, RSI and MACD can be switched on with the indicator buttons, and "Compare" plots ALT against the S&P 500, its sector or a competitor as a percentage change. Chart prices are adjusted for splits and dividends.