Aurora Cannabis Inc. /zigman2/quotes/210559470/composite ACB -5.06% /zigman2/quotes/203734337/delayed CA:ACB -4.18% said Wednesday it has filed a shelf registration with the Securities and Exchange Commission to offer up to $1 billion in securities. The shelf includes common shares, preferred shares, warrants, subscription receipts and debt securities and will be effective for a 25-month period. The Canadian cannabis company has regularly tapped capital markets in the past year and has renegotiated terms on its borrowing to preserve cash and boost liquidity. Aurora's U.S.-listed shares were lower on the news, as issuing shares would dilute the existing ones. They were last down 6%, and are down 17% in the last 12 months, while the Cannabis ETF /zigman2/quotes/213173823/composite THCX -3.75% has gained 131% and the S&P 500 /zigman2/quotes/210599714/realtime SPX +1.22% has gained 35%.