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PRTA Sep 2026 20.000 put (PRTA260918P00020000) Stock Historical Prices & Data - Yahoo! Finance CanadaYahoo! Finance Canada · Thu, 06 Aug 2026 18:04:49 GMTPRTA Sep 2026 4.000 call (PRTA260918C00004000) interactive stock chart - Yahoo Finance UKYahoo Finance UK · Mon, 03 Aug 2026 15:49:28 GMTPRTA Sep 2026 4.000 call (PRTA260918C00004000) stock historical prices and data - Yahoo Finance UKYahoo Finance UK · Sun, 02 Aug 2026 20:54:08 GMT