Exhibit 99.6

Notice to ASX/LSE

Block Listing Six Monthly Return

23 April 2020

Name of applicant:	Rio Tinto plc
Name of scheme:	Rio Tinto plc Share Savings Plan
Period of return:	22 October 2019 to 22 April 2020
Balance of unallotted securities under scheme(s) from previous return:	730,181
Plus: The amount by which the block scheme(s) has been increased since the date of the last return (if any increase has been applied for):	0
Less: Number of securities issued/allotted under scheme(s) during period:	0
Equals: Balance under scheme(s) not yet issued/allotted at end of period:	730,181

Name of applicant:	Rio Tinto plc
Name of scheme:	Rio Tinto plc Share Option Plan
Period of return:	22 October 2019 to 22 April 2020
Balance of unallotted securities under scheme(s) from previous return:	946,979
Plus: The amount by which the block scheme(s) has been increased since the date of the last return (if any increase has been applied for):	0
Less: Number of securities issued/allotted under scheme(s) during period:	0
Equals: Balance under scheme(s) not yet issued/allotted at end of period:	946,979

Name of applicant:	Rio Tinto plc
Name of scheme:	Rio Tinto plc Performance Share Plan
Period of return:	22 October 2019 to 22 April 2020
Balance of unallotted securities under scheme(s) from previous return:	358,183
Plus: The amount by which the block scheme(s) has been increased since the date of the last return (if any increase has been applied for):	0
Less: Number of securities issued/allotted under scheme(s) during period:	0
Equals: Balance under scheme(s) not yet issued/allotted at end of period:	358,183

Name of applicant:	Rio Tinto plc
Name of scheme:	Rio Tinto plc Global Employee Share Plan
Period of return:	22 October 2019 to 22 April 2020
Balance of unallotted securities under scheme(s) from previous return:	27,305
Plus: The amount by which the block scheme(s) has been increased since the date of the last return (if any increase has been applied for):	45,000
Less: Number of securities issued/allotted under scheme(s) during period:	20,687
Equals: Balance under scheme(s) not yet issued/allotted at end of period:	51,618

Name of contact:	Steve Allen
Telephone number of contact:	0207 781 2000

This announcement has been authorised for release to the market by Rio Tinto’s Group Company Secretary.

LEI: 213800YOEO5OQ72G2R82

Classification: 3.1. Additional regulated information required to be disclosed under the laws of a Member State.