Natural Alternatives International (NAII) Stock Chart & Stock Price History $2.59 -0.07 (-2.63%) Closing price 05/18/2026 04:00 PM EasternExtended Trading$2.60 +0.01 (+0.19%) As of 05/18/2026 04:04 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 ForecastsChartCompetitorsEarningsHeadlinesInsider TradesOwnershipSEC FilingsShort InterestTrendsBuy This Stock Natural Alternatives International Stock Price Performance The Natural Alternatives International (NAII) stock chart highlights key performance trends across multiple timeframes. Over the last 12 months, the stock's price has decreased 21.75%, with a year-to-date return of -27.65%. In the past month, the stock has decreased 4.60%, reflecting recent market activity. As of the latest close, Natural Alternatives International traded at $2.59 with a market cap of $16.01 million and volume of 15,026 shares. Five years ago, the stock traded at $14.32, representing a 81.91% decrease over that period. At the time, it had a market cap of $91.92 million and a volume of 4,277 shares. Receive NAII Stock News and Ratings via EmailSign-up to receive the latest news and ratings for Natural Alternatives International 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. 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Read our full terms of service and privacy policy. 5 Day Performance-4.07%1 Month Performance-4.60%3 Month Performance-1.89%Year-To-Date Performance-27.65%1 Year Performance-21.75%5 Year Performance-81.91% NAII Stock Chart for Tuesday, May, 19, 2026 NAII Chart by TradingView Natural Alternatives International 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 Capitalization05/18/2026$2.66$2.59-2.63%$2.77$2.5915,026 shs$16.01 million05/15/2026$2.70$2.66-1.48%$2.68$2.607,439 shs$16.44 million05/14/2026$2.71$2.70-0.37%$2.83$2.6912,603 shs$16.69 million05/13/2026$2.71$2.71$2.75$2.7013,694 shs$16.74 million05/12/2026$2.67$2.71+1.50%$2.82$2.689,276 shs$16.75 million05/11/2026$2.67$2.67$2.75$2.6611,970 shs$16.50 million05/08/2026$2.74$2.67-2.55%$2.80$2.674,649 shs$16.92 million05/07/2026$2.72$2.74+0.74%$2.75$2.695,228 shs$16.93 million05/06/2026$2.61$2.72+4.21%$2.75$2.659,942 shs$16.81 million05/05/2026N/A$2.61$2.71$2.5845,844 shs$16.13 million Get the Latest News and Ratings for NAII and Related StocksEnter your email address below to receive the latest news and analysts' ratings for Natural Alternatives International and its competitors with MarketBeat's FREE daily newsletter. 04/30/2026$2.67$2.67$2.72$2.6522,971 shs$16.50 million04/29/2026$2.68$2.67-0.37%$2.78$2.676,328 shs$16.50 million04/28/2026$2.71$2.68-1.11%$2.83$2.6817,549 shs$16.55 million04/27/2026$2.67$2.71+1.50%$2.82$2.7161,486 shs$16.75 million04/24/2026$2.76$2.67-3.26%$2.84$2.6513,167 shs$16.50 million04/23/2026$2.80$2.76-1.43%$2.83$2.7039,810 shs$17.06 million04/22/2026$2.69$2.80+4.05%$2.80$2.7336,385 shs$17.30 million04/21/2026$2.76$2.69-2.50%$2.85$2.686,126 shs$16.63 million04/20/2026$2.72$2.76+1.66%$2.77$2.7027,175 shs$17.06 million Related Companies Lifevantage Stock Chart Estrella Immunopharma Stock Chart Cingulate Stock Chart OnKure Therapeutics Stock Chart BeyondSpring Stock Chart PyroGenesis Canada Stock Chart Invizyne Technologies Stock Chart ImageneBio Stock Chart Greenland Mines Ltd. Common Stock Stock Chart MiNK Therapeutics Stock Chart Receive NAII Stock News and Ratings via EmailSign-up to receive the latest news and ratings for Natural Alternatives International and its competitors with MarketBeat's FREE daily newsletter. This page (NASDAQ:NAII) was last updated on 5/19/2026 by MarketBeat.com Staff. 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