{"id":994557,"date":"2026-08-12T22:06:17","date_gmt":"2026-08-13T02:06:17","guid":{"rendered":"https:\/\/www.marketnewsdesk.com\/index.php\/sion-alert-investigation-launched-into-sionna-therapeutics-inc-rgrd-law-attorneys-encourage-investors-and-potential-witnesses-to-contact-law-firm\/"},"modified":"2026-08-12T22:06:17","modified_gmt":"2026-08-13T02:06:17","slug":"sion-alert-investigation-launched-into-sionna-therapeutics-inc-rgrd-law-attorneys-encourage-investors-and-potential-witnesses-to-contact-law-firm","status":"publish","type":"post","link":"https:\/\/www.marketnewsdesk.com\/index.php\/sion-alert-investigation-launched-into-sionna-therapeutics-inc-rgrd-law-attorneys-encourage-investors-and-potential-witnesses-to-contact-law-firm\/","title":{"rendered":"SION ALERT: Investigation Launched into Sionna Therapeutics, Inc., RGRD Law Attorneys Encourage Investors and Potential Witnesses to Contact Law Firm"},"content":{"rendered":"<div class=\"xn-newslines\">\n<p class=\"xn-distributor\">PR Newswire<\/p>\n<\/p><\/div>\n<div class=\"xn-content\">\n<p>\n        <span class=\"legendSpanClass\">SAN DIEGO<\/span>, <span class=\"legendSpanClass\">Aug. 12, 2026<\/span> \/PRNewswire\/ &#8212; <a href=\"https:\/\/edge.prnewswire.com\/c\/link\/?t=0&amp;l=en&amp;o=4751616-1&amp;h=3643041989&amp;u=https%3A%2F%2Fwww.rgrdlaw.com%2Fcases-sionna-therapeutics-inc-investigation-sion.html&amp;a=Robbins+Geller+Rudman+%26+Dowd+LLP\" target=\"_blank\" rel=\"nofollow\"><b>Robbins Geller Rudman &amp; Dowd LLP<\/b><\/a> is investigating potential violations of U.S. federal securities laws involving Sionna Therapeutics, Inc. (NASDAQ: SION).\u00a0<\/p>\n<div class=\"PRN_ImbeddedAssetReference\" id=\"DivAssetPlaceHolder1\">\n<p>\n          <img decoding=\"async\" src=\"https:\/\/mmx.prnewswire.com\/media\/MS675308\/robbins-geller-rudman-and-dowd-llp-logo-v2-Logo.jpg?id=OA2872431\" title=\"Robbins Geller Rudman &amp; Dowd LLP\" alt=\"Robbins Geller Rudman &amp; Dowd LLP\" \/>\n        <\/p>\n<\/p><\/div>\n<p>\n        <b>If you have information that could assist in the Sionna Therapeutics investigation or if you are a Sionna Therapeutics investor who suffered a loss and would like to learn more, you can provide your information here:<\/b>\n      <\/p>\n<p>\n        <a href=\"https:\/\/edge.prnewswire.com\/c\/link\/?t=0&amp;l=en&amp;o=4751616-1&amp;h=876863156&amp;u=https%3A%2F%2Fwww.rgrdlaw.com%2Fcases-sionna-therapeutics-inc-investigation-sion.html&amp;a=https%3A%2F%2Fwww.rgrdlaw.com%2Fcases-sionna-therapeutics-inc-investigation-sion.html\" target=\"_blank\" rel=\"nofollow\"><br \/>\n          <b>https:\/\/www.rgrdlaw.com\/cases-sionna-therapeutics-inc-investigation-sion.html<\/b><br \/>\n        <\/a>\n      <\/p>\n<p>\n        <b>You can also contact attorneys <\/b><br \/>\n        <a href=\"https:\/\/edge.prnewswire.com\/c\/link\/?t=0&amp;l=en&amp;o=4751616-1&amp;h=3108858883&amp;u=https%3A%2F%2Fwww.rgrdlaw.com%2Fcases-sionna-therapeutics-inc-investigation-sion.html&amp;a=Ken+Dolitsky\" target=\"_blank\" rel=\"nofollow\"><br \/>\n          <b>Ken Dolitsky<\/b><br \/>\n        <\/a><br \/>\n        <b> or <\/b><br \/>\n        <a href=\"https:\/\/edge.prnewswire.com\/c\/link\/?t=0&amp;l=en&amp;o=4751616-1&amp;h=1592280296&amp;u=https%3A%2F%2Fwww.rgrdlaw.com%2Fcases-sionna-therapeutics-inc-investigation-sion.html&amp;a=Michael+Albert\" target=\"_blank\" rel=\"nofollow\"><br \/>\n          <b>Michael Albert<\/b><br \/>\n        <\/a><br \/>\n        <b> of Robbins Geller by calling 800\/851-7783 or via e-mail at <\/b><br \/>\n        <a href=\"mailto:info@rgrdlaw.com\" target=\"_blank\" rel=\"nofollow\"><br \/>\n          <b>info@rgrdlaw.com<\/b><br \/>\n        <\/a><br \/>\n        <b>.<\/b>\n      <\/p>\n<p>\n        <b>THE COMPANY: <\/b>Sionna Therapeutics is a clinical-stage biopharmaceutical company that researches and develops medicines for the treatment of cystic fibrosis.<\/p>\n<p>\n        <b>THE REVELATION: <\/b>On August 10, 2026, Sionna Therapeutics announced that its &#8220;SION-719 Phase 2a proof-of-concept trial did not achieve key activity endpoint of sweat chloride reduction when added to standard of care.&#8221;\u00a0 On this news, the price of Sionna Therapeutics stock fell more than 91%.<\/p>\n<p>\n        <b>ABOUT ROBBINS GELLER: <\/b>Robbins Geller Rudman &amp; Dowd LLP is one of the world&#8217;s leading law firms representing investors in securities <span>fraud<\/span> and shareholder rights litigation.\u00a0 Our Firm ranked #1 on the most recent ISS Securities Class Action Services Top 50 Report, recovering more than $916 million for investors in 2025.\u00a0 This marks our fourth #1 ranking in the past five years.\u00a0 And in those five years alone, Robbins Geller recovered $8.4 billion for investors \u2013 $3.4 billion more than any other law firm.\u00a0 With 200 lawyers in 10 offices, Robbins Geller is one of the largest plaintiffs&#8217; firms in the world, and the Firm&#8217;s attorneys have obtained many of the largest securities class action recoveries in history, including the largest ever \u2013 $7.2 billion \u2013 in <i>In re Enron Corp. Sec. Litig.<\/i><\/p>\n<p>Past results do not guarantee future outcomes. <br \/>Services may be performed by attorneys in any of our offices.\u00a0<\/p>\n<p>Contact:<\/p>\n<p class=\"prnml40\">Robbins\u00a0Geller Rudman &amp; Dowd LLP<br \/>Ken\u00a0Dolitsky<br \/>Michael Albert<br \/>655 W. Broadway, Suite 1900, San Diego, CA 92101<br \/>800\/851-7783<br \/><a href=\"mailto:info@rgrdlaw.com\" target=\"_blank\" rel=\"nofollow\"><b>info@rgrdlaw.com<\/b><\/a>\u00a0<\/p>\n<p id=\"PURL\">\n        <img loading=\"lazy\" decoding=\"async\" title=\"Cision\" width=\"12\" height=\"12\" alt=\"Cision\" src=\"https:\/\/edge.prnewswire.com\/c\/img\/favicon.png?sn=LA25463&amp;sd=2026-08-12\" \/> View original content to download multimedia:<a id=\"PRNURL\" rel=\"nofollow\" href=\"https:\/\/www.prnewswire.com\/news-releases\/sion-alert-investigation-launched-into-sionna-therapeutics-inc-rgrd-law-attorneys-encourage-investors-and-potential-witnesses-to-contact-law-firm-302850214.html\" target=\"_blank\">https:\/\/www.prnewswire.com\/news-releases\/sion-alert-investigation-launched-into-sionna-therapeutics-inc-rgrd-law-attorneys-encourage-investors-and-potential-witnesses-to-contact-law-firm-302850214.html<\/a><\/p>\n<p>SOURCE Robbins Geller Rudman &amp; Dowd LLP<\/p>\n<\/p><\/div>\n<p>    <img decoding=\"async\" alt=\"\" src=\"https:\/\/rt.prnewswire.com\/rt.gif?NewsItemId=LA25463&amp;Transmission_Id=202608122203PR_NEWS_USPR_____LA25463&amp;DateId=20260812\" style=\"border:0px;width:1px;height:1px\" \/><\/p>\n","protected":false},"excerpt":{"rendered":"<p>PR Newswire SAN DIEGO, Aug. 12, 2026 \/PRNewswire\/ &#8212; Robbins Geller Rudman &amp; Dowd LLP is investigating potential violations of U.S. federal securities laws involving Sionna Therapeutics, Inc. (NASDAQ: SION).\u00a0 If you have information that could assist in the Sionna Therapeutics investigation or if you are a Sionna Therapeutics investor who suffered a loss and would like to learn more, you can provide your information here: https:\/\/www.rgrdlaw.com\/cases-sionna-therapeutics-inc-investigation-sion.html You can also contact attorneys Ken Dolitsky or Michael Albert of Robbins Geller by calling 800\/851-7783 or via e-mail at info@rgrdlaw.com . THE COMPANY: Sionna Therapeutics is a clinical-stage biopharmaceutical company that researches and develops medicines for the treatment of cystic fibrosis. THE REVELATION: On August 10, 2026, Sionna Therapeutics announced that its &hellip; <\/p>\n<p class=\"link-more\"><a href=\"https:\/\/www.marketnewsdesk.com\/index.php\/sion-alert-investigation-launched-into-sionna-therapeutics-inc-rgrd-law-attorneys-encourage-investors-and-potential-witnesses-to-contact-law-firm\/\" class=\"more-link\">Continue reading<span class=\"screen-reader-text\"> &#8220;SION ALERT: Investigation Launched into Sionna Therapeutics, Inc., RGRD Law Attorneys Encourage Investors and Potential Witnesses to Contact Law Firm&#8221;<\/span><\/a><\/p>\n","protected":false},"author":2,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[],"tags":[],"class_list":["post-994557","post","type-post","status-publish","format-standard","hentry"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v28.2 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>SION ALERT: Investigation Launched into Sionna Therapeutics, Inc., RGRD Law Attorneys Encourage Investors and Potential Witnesses to Contact Law Firm - Market Newsdesk<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.marketnewsdesk.com\/index.php\/sion-alert-investigation-launched-into-sionna-therapeutics-inc-rgrd-law-attorneys-encourage-investors-and-potential-witnesses-to-contact-law-firm\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"SION ALERT: Investigation Launched into Sionna Therapeutics, Inc., RGRD Law Attorneys Encourage Investors and Potential Witnesses to Contact Law Firm - Market Newsdesk\" \/>\n<meta property=\"og:description\" content=\"PR Newswire SAN DIEGO, Aug. 12, 2026 \/PRNewswire\/ &#8212; Robbins Geller Rudman &amp; Dowd LLP is investigating potential violations of U.S. federal securities laws involving Sionna Therapeutics, Inc. (NASDAQ: SION).\u00a0 If you have information that could assist in the Sionna Therapeutics investigation or if you are a Sionna Therapeutics investor who suffered a loss and would like to learn more, you can provide your information here: https:\/\/www.rgrdlaw.com\/cases-sionna-therapeutics-inc-investigation-sion.html You can also contact attorneys Ken Dolitsky or Michael Albert of Robbins Geller by calling 800\/851-7783 or via e-mail at info@rgrdlaw.com . THE COMPANY: Sionna Therapeutics is a clinical-stage biopharmaceutical company that researches and develops medicines for the treatment of cystic fibrosis. THE REVELATION: On August 10, 2026, Sionna Therapeutics announced that its &hellip; Continue reading &quot;SION ALERT: Investigation Launched into Sionna Therapeutics, Inc., RGRD Law Attorneys Encourage Investors and Potential Witnesses to Contact Law Firm&quot;\" \/>\n<meta property=\"og:url\" content=\"https:\/\/www.marketnewsdesk.com\/index.php\/sion-alert-investigation-launched-into-sionna-therapeutics-inc-rgrd-law-attorneys-encourage-investors-and-potential-witnesses-to-contact-law-firm\/\" \/>\n<meta property=\"og:site_name\" content=\"Market Newsdesk\" \/>\n<meta property=\"article:published_time\" content=\"2026-08-13T02:06:17+00:00\" \/>\n<meta property=\"og:image\" content=\"https:\/\/mmx.prnewswire.com\/media\/MS675308\/robbins-geller-rudman-and-dowd-llp-logo-v2-Logo.jpg?id=OA2872431\" \/>\n<meta name=\"author\" content=\"Newsdesk\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:label1\" content=\"Written by\" \/>\n\t<meta name=\"twitter:data1\" content=\"Newsdesk\" \/>\n\t<meta name=\"twitter:label2\" content=\"Est. reading time\" \/>\n\t<meta name=\"twitter:data2\" content=\"2 minutes\" \/>\n<script type=\"application\/ld+json\" class=\"yoast-schema-graph\">{\"@context\":\"https:\\\/\\\/schema.org\",\"@graph\":[{\"@type\":\"Article\",\"@id\":\"https:\\\/\\\/www.marketnewsdesk.com\\\/index.php\\\/sion-alert-investigation-launched-into-sionna-therapeutics-inc-rgrd-law-attorneys-encourage-investors-and-potential-witnesses-to-contact-law-firm\\\/#article\",\"isPartOf\":{\"@id\":\"https:\\\/\\\/www.marketnewsdesk.com\\\/index.php\\\/sion-alert-investigation-launched-into-sionna-therapeutics-inc-rgrd-law-attorneys-encourage-investors-and-potential-witnesses-to-contact-law-firm\\\/\"},\"author\":{\"name\":\"Newsdesk\",\"@id\":\"https:\\\/\\\/www.marketnewsdesk.com\\\/#\\\/schema\\\/person\\\/482f27a394d4fda80ecb5499e519d979\"},\"headline\":\"SION ALERT: Investigation Launched into Sionna Therapeutics, Inc., RGRD Law Attorneys Encourage Investors and Potential Witnesses to Contact Law Firm\",\"datePublished\":\"2026-08-13T02:06:17+00:00\",\"mainEntityOfPage\":{\"@id\":\"https:\\\/\\\/www.marketnewsdesk.com\\\/index.php\\\/sion-alert-investigation-launched-into-sionna-therapeutics-inc-rgrd-law-attorneys-encourage-investors-and-potential-witnesses-to-contact-law-firm\\\/\"},\"wordCount\":353,\"image\":{\"@id\":\"https:\\\/\\\/www.marketnewsdesk.com\\\/index.php\\\/sion-alert-investigation-launched-into-sionna-therapeutics-inc-rgrd-law-attorneys-encourage-investors-and-potential-witnesses-to-contact-law-firm\\\/#primaryimage\"},\"thumbnailUrl\":\"https:\\\/\\\/mmx.prnewswire.com\\\/media\\\/MS675308\\\/robbins-geller-rudman-and-dowd-llp-logo-v2-Logo.jpg?id=OA2872431\",\"inLanguage\":\"en-US\"},{\"@type\":\"WebPage\",\"@id\":\"https:\\\/\\\/www.marketnewsdesk.com\\\/index.php\\\/sion-alert-investigation-launched-into-sionna-therapeutics-inc-rgrd-law-attorneys-encourage-investors-and-potential-witnesses-to-contact-law-firm\\\/\",\"url\":\"https:\\\/\\\/www.marketnewsdesk.com\\\/index.php\\\/sion-alert-investigation-launched-into-sionna-therapeutics-inc-rgrd-law-attorneys-encourage-investors-and-potential-witnesses-to-contact-law-firm\\\/\",\"name\":\"SION ALERT: Investigation Launched into Sionna Therapeutics, Inc., RGRD Law Attorneys Encourage Investors and Potential Witnesses to Contact Law Firm - 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(NASDAQ: SION).\u00a0 If you have information that could assist in the Sionna Therapeutics investigation or if you are a Sionna Therapeutics investor who suffered a loss and would like to learn more, you can provide your information here: https:\/\/www.rgrdlaw.com\/cases-sionna-therapeutics-inc-investigation-sion.html You can also contact attorneys Ken Dolitsky or Michael Albert of Robbins Geller by calling 800\/851-7783 or via e-mail at info@rgrdlaw.com . THE COMPANY: Sionna Therapeutics is a clinical-stage biopharmaceutical company that researches and develops medicines for the treatment of cystic fibrosis. THE REVELATION: On August 10, 2026, Sionna Therapeutics announced that its &hellip; Continue reading \"SION ALERT: Investigation Launched into Sionna Therapeutics, Inc., RGRD Law Attorneys Encourage Investors and Potential Witnesses to Contact Law Firm\"","og_url":"https:\/\/www.marketnewsdesk.com\/index.php\/sion-alert-investigation-launched-into-sionna-therapeutics-inc-rgrd-law-attorneys-encourage-investors-and-potential-witnesses-to-contact-law-firm\/","og_site_name":"Market Newsdesk","article_published_time":"2026-08-13T02:06:17+00:00","og_image":[{"url":"https:\/\/mmx.prnewswire.com\/media\/MS675308\/robbins-geller-rudman-and-dowd-llp-logo-v2-Logo.jpg?id=OA2872431","type":"","width":"","height":""}],"author":"Newsdesk","twitter_card":"summary_large_image","twitter_misc":{"Written by":"Newsdesk","Est. reading time":"2 minutes"},"schema":{"@context":"https:\/\/schema.org","@graph":[{"@type":"Article","@id":"https:\/\/www.marketnewsdesk.com\/index.php\/sion-alert-investigation-launched-into-sionna-therapeutics-inc-rgrd-law-attorneys-encourage-investors-and-potential-witnesses-to-contact-law-firm\/#article","isPartOf":{"@id":"https:\/\/www.marketnewsdesk.com\/index.php\/sion-alert-investigation-launched-into-sionna-therapeutics-inc-rgrd-law-attorneys-encourage-investors-and-potential-witnesses-to-contact-law-firm\/"},"author":{"name":"Newsdesk","@id":"https:\/\/www.marketnewsdesk.com\/#\/schema\/person\/482f27a394d4fda80ecb5499e519d979"},"headline":"SION ALERT: Investigation Launched into Sionna Therapeutics, Inc., RGRD Law Attorneys Encourage Investors and Potential Witnesses to Contact Law Firm","datePublished":"2026-08-13T02:06:17+00:00","mainEntityOfPage":{"@id":"https:\/\/www.marketnewsdesk.com\/index.php\/sion-alert-investigation-launched-into-sionna-therapeutics-inc-rgrd-law-attorneys-encourage-investors-and-potential-witnesses-to-contact-law-firm\/"},"wordCount":353,"image":{"@id":"https:\/\/www.marketnewsdesk.com\/index.php\/sion-alert-investigation-launched-into-sionna-therapeutics-inc-rgrd-law-attorneys-encourage-investors-and-potential-witnesses-to-contact-law-firm\/#primaryimage"},"thumbnailUrl":"https:\/\/mmx.prnewswire.com\/media\/MS675308\/robbins-geller-rudman-and-dowd-llp-logo-v2-Logo.jpg?id=OA2872431","inLanguage":"en-US"},{"@type":"WebPage","@id":"https:\/\/www.marketnewsdesk.com\/index.php\/sion-alert-investigation-launched-into-sionna-therapeutics-inc-rgrd-law-attorneys-encourage-investors-and-potential-witnesses-to-contact-law-firm\/","url":"https:\/\/www.marketnewsdesk.com\/index.php\/sion-alert-investigation-launched-into-sionna-therapeutics-inc-rgrd-law-attorneys-encourage-investors-and-potential-witnesses-to-contact-law-firm\/","name":"SION ALERT: Investigation Launched into Sionna Therapeutics, Inc., RGRD Law Attorneys Encourage Investors and Potential Witnesses to Contact Law Firm - 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