Exhibit

Exhibit 99.6

8 October 2019

Rio Tinto plc - Transaction in own shares

Rio Tinto plc (the "Company") today announces that on 8 October 2019 it purchased the following number of ordinary shares of 10 pence each in the Company (the “Ordinary Shares”) on the London Stock Exchange from J.P. Morgan Securities plc. These shares will be cancelled.

Ordinary Shares



Date of Purchase	8 October 2019
Number of ordinary shares purchased	11,259
Average price paid (pence)	4034.4782
Highest price paid (pence)	4055.0000
Lowest price paid (pence)	4021.0000

These share purchases form part of the Company's share buy-back programme which is expected to be completed over the period from 28 February 2019 to 28 February 2020, details of which were announced on 20 September 2018.

In respect of this programme, J.P. Morgan Securities plc will make trading decisions in relation to the Company’s Ordinary Shares repurchased under the buy-back programme independently of, and uninfluenced by, the Company for the period from 20 May 2019 to 26 February 2020.

Any such acquisitions will be effected within certain pre-set parameters, and in accordance with the Company’s general authority to repurchase Ordinary Shares, Chapter 12 of the Listing Rules and the provisions of the Market Abuse Regulation 596/2014/EU dealing with buy-back programmes.

Following the cancellation of the Ordinary Shares repurchased, the Company will have 1,263,119,700 Ordinary Shares in issue. To the extent that further Ordinary Shares are repurchased under the programme, these will also be cancelled.

In accordance with the Market Abuse Regulation 596/2014/EU, a full breakdown of the individual trades is detailed below:

Transaction details: Rio Tinto plc ordinary shares of 10 pence each

Issuer name: Rio Tinto plc

LEI: 213800YOEO5OQ72G2R82

Classification: 2.4. Acquisition or disposal of the issuer’s own shares
ISIN: GB0007188757
Intermediary name: J.P. Morgan Securities plc
Intermediary Code: JPMSGB2L
Timezone: BST
Currency: GBp

Aggregated Information

Date of purchase: 8 October 2019
Number of ordinary shares purchased: 11,259
Volume weighted average price paid per share (pence): 4034.4782

Page 1 of 5



Transaction Date and Time	Volume	Price (GBp)	Platform	Transaction Reference Number
08-Oct-2019 10:56:38	1	4055.0000	XLON	01002010000024082-E0ficUpbEIjE20191008
08-Oct-2019 12:02:21	77	4035.0000	XLON	01002010000031861-E0ficUpbFhEy20191008
08-Oct-2019 12:04:03	76	4037.0000	XLON	01002010000032154-E0ficUpbFmGS20191008
08-Oct-2019 12:06:06	77	4035.5000	XLON	11002110000032375-E0ficUpbFrMD20191008
08-Oct-2019 12:10:00	81	4043.5000	XLON	11002110000032727-E0ficUpbFxlB20191008
08-Oct-2019 12:11:21	78	4045.5000	XLON	11002110000033183-E0ficUpbG0Fb20191008
08-Oct-2019 12:15:46	80	4040.0000	XLON	01002010000034575-E0ficUpbG5os20191008
08-Oct-2019 12:21:06	84	4039.5000	XLON	01002010000035317-E0ficUpbGBq020191008
08-Oct-2019 12:22:18	69	4036.5000	XLON	01002010000035503-E0ficUpbGDJ920191008
08-Oct-2019 12:22:18	10	4036.5000	XLON	01002010000035503-E0ficUpbGDJ520191008
08-Oct-2019 12:25:46	83	4034.0000	XLON	01002010000035710-E0ficUpbGH4020191008
08-Oct-2019 12:31:32	114	4032.0000	XLON	11002110000035960-E0ficUpbGNuD20191008
08-Oct-2019 12:36:33	77	4043.0000	XLON	01002010000036513-E0ficUpbGTVW20191008
08-Oct-2019 12:38:01	76	4048.0000	XLON	01002010000036628-E0ficUpbGVdi20191008
08-Oct-2019 12:38:57	76	4045.5000	XLON	01002010000036691-E0ficUpbGXQQ20191008
08-Oct-2019 12:41:41	76	4045.5000	XLON	11002110000036741-E0ficUpbGZne20191008
08-Oct-2019 12:51:27	77	4047.0000	XLON	11002110000037727-E0ficUpbGk1y20191008
08-Oct-2019 13:00:56	91	4037.0000	XLON	01002010000038538-E0ficUpbGtUH20191008
08-Oct-2019 13:02:44	80	4039.0000	XLON	11002110000038586-E0ficUpbGvlV20191008
08-Oct-2019 13:05:00	81	4042.0000	XLON	11002110000038742-E0ficUpbGyNj20191008
08-Oct-2019 13:06:32	77	4045.0000	XLON	01002010000038991-E0ficUpbGzw520191008
08-Oct-2019 13:09:01	81	4043.0000	XLON	01002010000039126-E0ficUpbH2YF20191008
08-Oct-2019 13:11:52	80	4046.5000	XLON	11002110000039404-E0ficUpbH5Fe20191008
08-Oct-2019 13:16:20	70	4041.0000	XLON	01002010000039844-E0ficUpbHAvz20191008
08-Oct-2019 13:16:20	6	4041.0000	XLON	01002010000039844-E0ficUpbHAvx20191008
08-Oct-2019 13:21:38	92	4043.0000	XLON	11002110000040385-E0ficUpbHHLO20191008
08-Oct-2019 13:24:48	36	4047.5000	XLON	01002010000040743-E0ficUpbHLFX20191008
08-Oct-2019 13:25:09	40	4047.5000	XLON	01002010000040743-E0ficUpbHLYS20191008
08-Oct-2019 13:26:00	81	4048.0000	XLON	01002010000041454-E0ficUpbHMOz20191008
08-Oct-2019 13:29:00	77	4046.5000	XLON	01002010000043433-E0ficUpbHOmi20191008
08-Oct-2019 13:31:06	84	4049.5000	XLON	01002010000045204-E0ficUpbHS2W20191008
08-Oct-2019 14:30:34	91	4040.0000	XLON	11002110000052236-E0ficUpbIXb820191008
08-Oct-2019 14:32:32	79	4037.0000	XLON	11002110000052830-E0ficUpbIcfz20191008
08-Oct-2019 14:33:30	81	4042.0000	XLON	01002010000053155-E0ficUpbIfI820191008
08-Oct-2019 14:34:14	84	4039.5000	XLON	11002110000053244-E0ficUpbIh3U20191008
08-Oct-2019 14:34:17	53	4039.0000	XLON	01002010000053297-E0ficUpbIhB420191008
08-Oct-2019 14:34:17	24	4039.0000	XLON	01002010000053297-E0ficUpbIhB620191008
08-Oct-2019 14:36:32	76	4037.0000	XLON	11002110000053550-E0ficUpbImES20191008
08-Oct-2019 14:37:43	78	4032.0000	XLON	01002010000053743-E0ficUpbIon620191008
08-Oct-2019 14:40:19	77	4034.0000	XLON	01002010000054209-E0ficUpbIu5i20191008
08-Oct-2019 14:40:46	60	4034.5000	XLON	01002010000054328-E0ficUpbIv2N20191008
08-Oct-2019 14:41:28	31	4034.5000	XLON	01002010000054328-E0ficUpbIwTO20191008
08-Oct-2019 14:42:07	92	4034.0000	XLON	11002110000054419-E0ficUpbIxZK20191008
08-Oct-2019 14:42:28	84	4035.5000	XLON	01002010000054610-E0ficUpbIyJp20191008
08-Oct-2019 14:44:08	99	4035.0000	XLON	11002110000054734-E0ficUpbJ0iD20191008
08-Oct-2019 14:44:53	80	4038.5000	XLON	11002110000054892-E0ficUpbJ27Y20191008

Page 2 of 5



Transaction Date and Time	Volume	Price (GBp)	Platform	Transaction Reference Number
08-Oct-2019 14:45:52	43	4041.5000	XLON	01002010000055107-E0ficUpbJ4Ko20191008
08-Oct-2019 14:45:52	48	4041.5000	XLON	01002010000055107-E0ficUpbJ4Kl20191008
08-Oct-2019 14:47:15	156	4038.0000	XLON	01002010000055416-E0ficUpbJ6qa20191008
08-Oct-2019 14:49:07	186	4036.5000	XLON	11002110000055655-E0ficUpbJ9p920191008
08-Oct-2019 14:49:19	78	4034.5000	XLON	01002010000055767-E0ficUpbJAL620191008
08-Oct-2019 14:51:01	95	4032.5000	XLON	01002010000056110-E0ficUpbJDWv20191008
08-Oct-2019 14:51:01	115	4032.5000	XLON	11002110000056032-E0ficUpbJDWt20191008
08-Oct-2019 14:51:10	62	4030.5000	XLON	11002110000056041-E0ficUpbJDrK20191008
08-Oct-2019 14:51:14	129	4030.5000	XLON	11002110000056041-E0ficUpbJDyQ20191008
08-Oct-2019 14:52:14	30	4031.0000	XLON	11002110000056193-E0ficUpbJFnR20191008
08-Oct-2019 14:52:14	107	4031.0000	XLON	11002110000056193-E0ficUpbJFnT20191008
08-Oct-2019 14:53:05	81	4032.0000	XLON	01002010000056344-E0ficUpbJHFy20191008
08-Oct-2019 14:53:58	106	4032.0000	XLON	01002010000056503-E0ficUpbJIg320191008
08-Oct-2019 14:54:01	76	4031.0000	XLON	11002110000056406-E0ficUpbJIpD20191008
08-Oct-2019 14:55:35	48	4028.5000	XLON	11002110000056650-E0ficUpbJLq420191008
08-Oct-2019 14:56:19	28	4030.0000	XLON	11002110000056756-E0ficUpbJNMQ20191008
08-Oct-2019 14:58:21	85	4029.0000	XLON	01002010000057017-E0ficUpbJQci20191008
08-Oct-2019 14:59:01	132	4029.0000	XLON	01002010000057250-E0ficUpbJRgY20191008
08-Oct-2019 15:00:56	324	4029.0000	XLON	11002110000057554-E0ficUpbJW9G20191008
08-Oct-2019 15:01:54	28	4028.0000	XLON	01002010000057799-E0ficUpbJYeT20191008
08-Oct-2019 15:01:54	131	4028.0000	XLON	11002110000057701-E0ficUpbJYeV20191008
08-Oct-2019 15:01:54	106	4028.0000	XLON	01002010000057799-E0ficUpbJYeQ20191008
08-Oct-2019 15:02:37	228	4025.5000	XLON	11002110000057822-E0ficUpbJaAf20191008
08-Oct-2019 15:03:29	168	4024.0000	XLON	11002110000057947-E0ficUpbJc2r20191008
08-Oct-2019 15:04:18	160	4024.0000	XLON	11002110000058160-E0ficUpbJe5j20191008
08-Oct-2019 15:05:43	59	4022.5000	XLON	01002010000058462-E0ficUpbJggZ20191008
08-Oct-2019 15:05:43	72	4022.5000	XLON	01002010000058462-E0ficUpbJggh20191008
08-Oct-2019 15:06:23	150	4022.0000	XLON	11002110000058410-E0ficUpbJhxR20191008
08-Oct-2019 15:07:24	38	4025.0000	XLON	01002010000058728-E0ficUpbJk3620191008
08-Oct-2019 15:07:24	194	4025.0000	XLON	01002010000058728-E0ficUpbJk3820191008
08-Oct-2019 15:07:27	166	4024.0000	XLON	01002010000058701-E0ficUpbJk9g20191008
08-Oct-2019 15:09:06	78	4021.0000	XLON	01002010000058878-E0ficUpbJn1z20191008
08-Oct-2019 15:09:12	128	4021.0000	XLON	01002010000058878-E0ficUpbJnBQ20191008
08-Oct-2019 15:10:50	37	4026.0000	XLON	01002010000059168-E0ficUpbJqzW20191008
08-Oct-2019 15:10:50	100	4026.0000	XLON	01002010000059168-E0ficUpbJqzY20191008
08-Oct-2019 15:12:17	137	4031.5000	XLON	11002110000059284-E0ficUpbJu8e20191008
08-Oct-2019 15:13:58	114	4034.5000	XLON	11002110000059538-E0ficUpbJxO120191008
08-Oct-2019 15:13:58	80	4034.5000	XLON	01002010000059679-E0ficUpbJxO520191008
08-Oct-2019 15:14:01	95	4034.0000	XLON	01002010000059663-E0ficUpbJxRM20191008
08-Oct-2019 15:15:31	119	4033.5000	XLON	11002110000059731-E0ficUpbK0dO20191008
08-Oct-2019 15:15:32	167	4033.0000	XLON	01002010000059849-E0ficUpbK0gZ20191008
08-Oct-2019 15:15:34	155	4032.0000	XLON	11002110000059732-E0ficUpbK0jw20191008
08-Oct-2019 15:17:41	31	4031.5000	XLON	11002110000060026-E0ficUpbK40Y20191008
08-Oct-2019 15:17:41	290	4031.5000	XLON	11002110000060027-E0ficUpbK40c20191008
08-Oct-2019 15:17:41	79	4031.5000	XLON	01002010000060138-E0ficUpbK40a20191008
08-Oct-2019 15:17:41	300	4031.5000	XLON	11002110000060026-E0ficUpbK40W20191008
08-Oct-2019 15:17:41	6	4031.5000	XLON	11002110000060027-E0ficUpbK40j20191008

Page 3 of 5



Transaction Date and Time	Volume	Price (GBp)	Platform	Transaction Reference Number
08-Oct-2019 15:17:41	97	4031.5000	XLON	11002110000060026-E0ficUpbK40U20191008
08-Oct-2019 15:18:26	32	4036.0000	XLON	11002110000060138-E0ficUpbK5sh20191008
08-Oct-2019 15:18:26	153	4036.0000	XLON	11002110000060138-E0ficUpbK5s720191008
08-Oct-2019 15:19:56	100	4036.5000	XLON	01002010000060399-E0ficUpbK8Zg20191008
08-Oct-2019 15:20:49	66	4037.5000	XLON	11002110000060628-E0ficUpbK9xo20191008
08-Oct-2019 15:20:49	11	4037.5000	XLON	11002110000060628-E0ficUpbK9xm20191008
08-Oct-2019 15:22:21	78	4034.0000	XLON	11002110000061057-E0ficUpbKCPZ20191008
08-Oct-2019 15:24:40	79	4036.5000	XLON	01002010000061509-E0ficUpbKGJt20191008
08-Oct-2019 15:25:44	83	4035.0000	XLON	11002110000061600-E0ficUpbKIOZ20191008
08-Oct-2019 15:27:59	83	4034.5000	XLON	01002010000062092-E0ficUpbKLI920191008
08-Oct-2019 15:29:05	54	4032.0000	XLON	11002110000062447-E0ficUpbKMeE20191008
08-Oct-2019 15:29:06	27	4032.0000	XLON	11002110000062447-E0ficUpbKMhL20191008
08-Oct-2019 15:30:52	76	4039.0000	XLON	11002110000063392-E0ficUpbKQO420191008
08-Oct-2019 15:31:01	84	4037.0000	XLON	11002110000063405-E0ficUpbKQmo20191008
08-Oct-2019 15:32:34	84	4041.0000	XLON	11002110000063627-E0ficUpbKTT920191008
08-Oct-2019 15:34:07	81	4039.0000	XLON	01002010000063914-E0ficUpbKVpX20191008
08-Oct-2019 15:35:57	76	4037.5000	XLON	01002010000064247-E0ficUpbKZ7p20191008
08-Oct-2019 15:36:00	10	4036.5000	XLON	01002010000064209-E0ficUpbKZFx20191008
08-Oct-2019 15:36:00	67	4036.5000	XLON	01002010000064209-E0ficUpbKZFM20191008
08-Oct-2019 15:37:36	21	4036.5000	XLON	01002010000064516-E0ficUpbKc8c20191008
08-Oct-2019 15:37:36	78	4036.5000	XLON	01002010000064516-E0ficUpbKc8Z20191008
08-Oct-2019 15:39:28	82	4039.0000	XLON	01002010000064812-E0ficUpbKfhz20191008
08-Oct-2019 15:51:08	149	4034.0000	XLON	11002110000066527-E0ficUpbKz2L20191008
08-Oct-2019 15:51:10	198	4033.5000	XLON	11002110000066433-E0ficUpbKz6R20191008
08-Oct-2019 15:52:43	99	4035.5000	XLON	01002010000066947-E0ficUpbL1ev20191008
08-Oct-2019 15:52:56	80	4035.5000	XLON	11002110000066835-E0ficUpbL25420191008
08-Oct-2019 15:54:45	51	4038.0000	XLON	11002110000067235-E0ficUpbL5oD20191008
08-Oct-2019 15:55:42	76	4044.5000	XLON	11002110000067540-E0ficUpbL9ki20191008
08-Oct-2019 15:55:42	22	4044.5000	XLON	11002110000067540-E0ficUpbL9kd20191008
08-Oct-2019 15:56:56	76	4044.0000	XLON	11002110000067825-E0ficUpbLCci20191008
08-Oct-2019 15:57:16	94	4043.0000	XLON	11002110000067997-E0ficUpbLDCh20191008
08-Oct-2019 15:57:16	5	4043.0000	XLON	11002110000067997-E0ficUpbLDCe20191008
08-Oct-2019 15:57:18	99	4042.5000	XLON	01002010000068170-E0ficUpbLDIR20191008
08-Oct-2019 16:00:01	58	4041.0000	XLON	01002010000068711-E0ficUpbLIPC20191008
08-Oct-2019 16:00:01	13	4041.0000	XLON	01002010000068711-E0ficUpbLIP320191008
08-Oct-2019 16:00:01	12	4041.0000	XLON	01002010000068711-E0ficUpbLIP920191008
08-Oct-2019 16:00:28	13	4041.5000	XLON	01002010000068911-E0ficUpbLJCO20191008
08-Oct-2019 16:00:28	70	4041.5000	XLON	01002010000068911-E0ficUpbLJCQ20191008

Page 4 of 5

Contacts

media.enquiries@riotinto.com

riotinto.com

Follow @RioTinto on Twitter



Media Relations, United Kingdom Illtud Harri T +44 20 7781 1152 M +44 7920 503 600 David Outhwaite T +44 20 7781 1623 M +44 7787 597 493 Investor Relations, United Kingdom John Smelt T +44 20 7781 1654 M +44 7879 642 675 David Ovington T +44 20 7781 2051 M +44 7920 010 978 Nick Parkinson T +44 20 7781 1552 M +44 7810 657 556	Media Relations, Australia Jonathan Rose T +61 3 9283 3088 M +61 447 028 913 Investor Relations, Australia Natalie Worley T +61 3 9283 3063 M +61 409 210 462 Rachel Storrs T +61 3 9283 3628 M +61 417 401 018

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