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UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington , D.C. 20549 FORM 40 - F Registration statement pursuant to Section 12 of the Securities Exchange Act of 1934 or Annual report pursuant to Section 13 ( a ) or 15 ( d ) of the Securities Exchange Act of 1934 For the fiscal year ended : December 31 , 2020 British Columbia , Canada ( Province or Other Jurisdiction of Incorporation or Organization ) Commission File Number : 000-53543 Ballard Power Systems Inc. ( Exact name of registrant as specified in its charter ) 3620 ( Primary Standard Industrial Classification Code Number ) 9000 Glenlyon Parkway Burnaby , BC Canada V5J 5J8 ( 604 ) 454-0900 ( Address and telephone number of registrant's principal executive offices ) Not Applicable ( I.R.S. Employer Identification No. ) CT Corporation System 28 Liberty St. New York , NY 10005 ( 212 ) 894-8940 ( Name , address ( including zip code ) and telephone number ( including area code ) of agent for service in the United States ) Securities registered or to be registered pursuant to Section 12 ( b ) of the Act : Title of Each Class : Common Shares Trading Symbol BLDP Name of Each Exchange On Which Registered : NASDAQ Global Market Securities registered or to be registered pursuant to Section 12 ( g ) of the Act : Not applicable Securities for which there is a reporting obligation pursuant to Section 15 ( d ) of the Act : Not applicable For annual reports , indicate by check mark the information filed with this form : Annual Information Form > Audited Annual Financial Statements Indicate the number of outstanding shares of each of the registrant's classes of capital or common stock as of the close of the period covered by the annual report : As of December 31 , 2020 , there were 282,078,177 common shares outstanding . Indicate by check mark whether the Registrant ( 1 ) has filed all reports required to be filed by Section 13 or 15 ( d ) of the Exchange Act during the preceding 12 months ( or for such shorter period that the Registrant was required to file such reports ) and ( 2 ) has been subject to such filing requirements for the past 90 days . > Yes □ No Indicate by check mark whether the Registrant has submitted electronically every Interactive Data File required to be submitted pursuant to Rule 405 of Regulation S - T ( §232.405 of this chapter ) during the preceding 12 months ( or such shorter period that the Registrant was required to submit such files ) . × Yes □ No Indicate by check mark whether the registrant is an emerging growth company as defined in Rule 12b - 2 of the Exchange Act .