Exhibit

Exhibit 99.4

5 November 2019

Rio Tinto plc - Transaction in own shares

Rio Tinto plc (the "Company") today announces that on 5 November 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	5 November 2019
Number of ordinary shares purchased	11,181
Average price paid (pence)	4304.2600
Highest price paid (pence)	4336.5000
Lowest price paid (pence)	4293.0000

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 1,261,988,351 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: GMT
Currency: GBp

Aggregated Information

Date of purchase: 5 November 2019
Number of ordinary shares purchased: 11,181
Volume weighted average price paid per share (pence): 4304.2600

Page 1 of 5



Transaction Date and Time	Volume	Price (GBp)	Platform	Transaction Reference Number
05-Nov-2019 08:10:33	108	4317.0000	XLON	01003010000002601-E0g2xEUZc70420191105
05-Nov-2019 08:10:35	50	4315.5000	XLON	01003010000002586-E0g2xEUZc74h20191105
05-Nov-2019 08:10:35	87	4315.5000	XLON	01003010000002586-E0g2xEUZc74y20191105
05-Nov-2019 08:12:58	227	4315.0000	XLON	11003110000003190-E0g2xEUZcCbi20191105
05-Nov-2019 08:12:59	190	4313.5000	XLON	01003010000003152-E0g2xEUZcCdQ20191105
05-Nov-2019 08:14:03	70	4309.0000	XLON	01003010000003375-E0g2xEUZcEJv20191105
05-Nov-2019 08:14:04	77	4307.0000	XLON	11003110000003380-E0g2xEUZcEMP20191105
05-Nov-2019 08:15:35	91	4310.0000	XLON	01003010000003723-E0g2xEUZcGpH20191105
05-Nov-2019 08:15:35	77	4311.0000	XLON	11003110000003732-E0g2xEUZcGnF20191105
05-Nov-2019 08:18:09	71	4313.0000	XLON	11003110000004168-E0g2xEUZcM1h20191105
05-Nov-2019 08:19:14	31	4311.0000	XLON	01003010000004310-E0g2xEUZcNbc20191105
05-Nov-2019 08:19:14	39	4311.0000	XLON	01003010000004310-E0g2xEUZcNba20191105
05-Nov-2019 08:20:50	103	4312.5000	XLON	01003010000004638-E0g2xEUZcQ7820191105
05-Nov-2019 08:22:25	102	4311.5000	XLON	11003110000004908-E0g2xEUZcSgb20191105
05-Nov-2019 08:23:01	178	4310.0000	XLON	11003110000004892-E0g2xEUZcTEX20191105
05-Nov-2019 08:24:44	143	4303.5000	XLON	11003110000005126-E0g2xEUZcWJD20191105
05-Nov-2019 08:24:44	132	4303.5000	XLON	11003110000005126-E0g2xEUZcWJH20191105
05-Nov-2019 08:25:45	74	4300.5000	XLON	01003010000005463-E0g2xEUZcXbE20191105
05-Nov-2019 08:25:51	52	4299.5000	XLON	01003010000005439-E0g2xEUZcXkt20191105
05-Nov-2019 08:25:51	81	4299.5000	XLON	01003010000005439-E0g2xEUZcXkw20191105
05-Nov-2019 08:25:51	39	4299.5000	XLON	01003010000005439-E0g2xEUZcXkr20191105
05-Nov-2019 08:27:10	93	4301.5000	XLON	01003010000005755-E0g2xEUZca8620191105
05-Nov-2019 08:28:48	52	4306.5000	XLON	11003110000006028-E0g2xEUZccS920191105
05-Nov-2019 08:28:48	46	4306.5000	XLON	11003110000006028-E0g2xEUZccS220191105
05-Nov-2019 08:30:42	105	4305.0000	XLON	11003110000006364-E0g2xEUZcfSW20191105
05-Nov-2019 08:32:14	100	4301.0000	XLON	01003010000006706-E0g2xEUZchnN20191105
05-Nov-2019 08:32:15	91	4300.0000	XLON	11003110000006715-E0g2xEUZchqe20191105
05-Nov-2019 08:34:12	300	4298.5000	XLON	01003010000007025-E0g2xEUZckFe20191105
05-Nov-2019 08:34:12	9	4298.5000	XLON	01003010000007025-E0g2xEUZckFg20191105
05-Nov-2019 08:35:25	103	4296.0000	XLON	01003010000007201-E0g2xEUZcm5I20191105
05-Nov-2019 08:37:52	56	4299.0000	XLON	11003110000007686-E0g2xEUZcqA720191105
05-Nov-2019 08:37:52	27	4299.0000	XLON	11003110000007686-E0g2xEUZcqA920191105
05-Nov-2019 08:37:52	103	4299.5000	XLON	11003110000007871-E0g2xEUZcq9e20191105
05-Nov-2019 08:37:54	83	4298.0000	XLON	01003010000007617-E0g2xEUZcqCA20191105
05-Nov-2019 08:37:54	70	4298.5000	XLON	01003010000007691-E0g2xEUZcqBj20191105
05-Nov-2019 08:40:29	137	4300.0000	XLON	01003010000008398-E0g2xEUZctv720191105
05-Nov-2019 08:42:17	137	4303.0000	XLON	11003110000008975-E0g2xEUZcw7W20191105
05-Nov-2019 08:43:33	129	4298.5000	XLON	01003010000009486-E0g2xEUZcyNn20191105
05-Nov-2019 08:44:31	100	4299.5000	XLON	11003110000009761-E0g2xEUZczTC20191105
05-Nov-2019 08:45:17	47	4299.5000	XLON	11003110000009761-E0g2xEUZd0kd20191105
05-Nov-2019 08:45:30	126	4298.0000	XLON	01003010000010105-E0g2xEUZd12T20191105
05-Nov-2019 08:47:25	251	4296.0000	XLON	01003010000010659-E0g2xEUZd38i20191105
05-Nov-2019 08:49:18	118	4297.5000	XLON	11003110000010983-E0g2xEUZd5Oh20191105
05-Nov-2019 08:52:21	193	4294.5000	XLON	11003110000011489-E0g2xEUZd88020191105
05-Nov-2019 08:53:35	126	4296.0000	XLON	01003010000011682-E0g2xEUZd9fG20191105
05-Nov-2019 08:53:35	25	4296.0000	XLON	01003010000011682-E0g2xEUZd9fI20191105

Page 2 of 5



Transaction Date and Time	Volume	Price (GBp)	Platform	Transaction Reference Number
05-Nov-2019 08:54:01	154	4296.0000	XLON	01003010000011758-E0g2xEUZdA5x20191105
05-Nov-2019 08:56:36	145	4295.0000	XLON	11003110000012124-E0g2xEUZdDCK20191105
05-Nov-2019 08:57:58	153	4298.5000	XLON	11003110000012494-E0g2xEUZdEsg20191105
05-Nov-2019 08:59:49	185	4298.5000	XLON	01003010000013097-E0g2xEUZdHKN20191105
05-Nov-2019 09:01:49	122	4297.0000	XLON	11003110000013372-E0g2xEUZdKOu20191105
05-Nov-2019 09:03:27	172	4297.0000	XLON	11003110000014130-E0g2xEUZdMWZ20191105
05-Nov-2019 09:03:55	92	4298.5000	XLON	11003110000014799-E0g2xEUZdN1920191105
05-Nov-2019 09:06:05	82	4300.0000	XLON	01003010000015451-E0g2xEUZdQYu20191105
05-Nov-2019 09:06:05	81	4300.0000	XLON	01003010000015451-E0g2xEUZdQYs20191105
05-Nov-2019 09:07:11	34	4300.5000	XLON	11003110000015962-E0g2xEUZdSpt20191105
05-Nov-2019 09:07:11	104	4300.5000	XLON	11003110000015962-E0g2xEUZdSpr20191105
05-Nov-2019 09:07:11	18	4300.5000	XLON	11003110000015962-E0g2xEUZdSpv20191105
05-Nov-2019 09:09:12	85	4297.0000	XLON	01003010000016241-E0g2xEUZdV0R20191105
05-Nov-2019 09:09:21	194	4296.5000	XLON	01003010000016355-E0g2xEUZdVIC20191105
05-Nov-2019 09:09:21	4	4296.5000	XLON	01003010000016355-E0g2xEUZdVIE20191105
05-Nov-2019 09:11:45	143	4297.0000	XLON	01003010000017236-E0g2xEUZdZ0U20191105
05-Nov-2019 09:12:28	178	4296.5000	XLON	01003010000017711-E0g2xEUZdZyB20191105
05-Nov-2019 09:14:02	171	4295.5000	XLON	01003010000018260-E0g2xEUZdbFM20191105
05-Nov-2019 09:17:00	72	4297.5000	XLON	01003010000018925-E0g2xEUZddzl20191105
05-Nov-2019 09:17:00	71	4296.5000	XLON	11003110000019018-E0g2xEUZde1j20191105
05-Nov-2019 09:22:20	114	4303.5000	XLON	01003010000020873-E0g2xEUZdioC20191105
05-Nov-2019 09:24:15	71	4303.5000	XLON	01003010000021691-E0g2xEUZdkj820191105
05-Nov-2019 09:24:39	107	4302.0000	XLON	01003010000021590-E0g2xEUZdl4L20191105
05-Nov-2019 09:25:32	102	4302.5000	XLON	01003010000022190-E0g2xEUZdloD20191105
05-Nov-2019 09:28:24	7	4299.5000	XLON	11003110000023276-E0g2xEUZdoco20191105
05-Nov-2019 09:28:24	98	4299.5000	XLON	11003110000023276-E0g2xEUZdocl20191105
05-Nov-2019 09:30:02	73	4299.0000	XLON	01003010000023120-E0g2xEUZdqD920191105
05-Nov-2019 09:30:36	155	4298.5000	XLON	11003110000024649-E0g2xEUZdqnX20191105
05-Nov-2019 09:32:24	83	4293.5000	XLON	11003110000025166-E0g2xEUZdt0z20191105
05-Nov-2019 09:32:24	101	4293.0000	XLON	11003110000025225-E0g2xEUZdt3L20191105
05-Nov-2019 09:36:46	126	4296.0000	XLON	01003010000026375-E0g2xEUZdy9T20191105
05-Nov-2019 09:37:16	81	4295.5000	XLON	11003110000026700-E0g2xEUZdyla20191105
05-Nov-2019 09:39:10	72	4296.5000	XLON	11003110000027380-E0g2xEUZe0Z720191105
05-Nov-2019 09:43:32	73	4303.0000	XLON	01003010000028689-E0g2xEUZe4El20191105
05-Nov-2019 09:43:53	78	4301.0000	XLON	01003010000028818-E0g2xEUZe4ff20191105
05-Nov-2019 09:45:47	91	4302.5000	XLON	01003010000029394-E0g2xEUZe6NJ20191105
05-Nov-2019 09:47:23	5	4303.0000	XLON	11003110000029876-E0g2xEUZe7zO20191105
05-Nov-2019 09:47:23	72	4303.0000	XLON	11003110000029876-E0g2xEUZe7zM20191105
05-Nov-2019 09:49:22	119	4305.0000	XLON	01003010000030305-E0g2xEUZe9ZB20191105
05-Nov-2019 09:50:04	149	4304.5000	XLON	11003110000030344-E0g2xEUZeA6820191105
05-Nov-2019 09:51:11	77	4306.5000	XLON	11003110000030924-E0g2xEUZeB9G20191105
05-Nov-2019 09:55:00	85	4309.0000	XLON	01003010000032013-E0g2xEUZeEK520191105
05-Nov-2019 09:55:00	7	4309.0000	XLON	01003010000032013-E0g2xEUZeEK320191105
05-Nov-2019 09:56:39	106	4307.5000	XLON	01003010000031916-E0g2xEUZeGmX20191105
05-Nov-2019 09:57:30	122	4305.0000	XLON	01003010000032807-E0g2xEUZeHco20191105
05-Nov-2019 09:59:18	130	4304.5000	XLON	11003110000033396-E0g2xEUZeIuH20191105
05-Nov-2019 10:00:41	126	4302.5000	XLON	11003110000034212-E0g2xEUZeKCx20191105
05-Nov-2019 10:01:58	37	4299.5000	XLON	01003010000034264-E0g2xEUZeLOF20191105

Page 3 of 5



Transaction Date and Time	Volume	Price (GBp)	Platform	Transaction Reference Number
05-Nov-2019 10:01:58	38	4299.5000	XLON	01003010000034264-E0g2xEUZeLOH20191105
05-Nov-2019 10:03:32	42	4302.0000	XLON	11003110000035001-E0g2xEUZeMdn20191105
05-Nov-2019 10:03:32	55	4302.0000	XLON	11003110000035001-E0g2xEUZeMds20191105
05-Nov-2019 10:05:41	71	4307.5000	XLON	01003010000035808-E0g2xEUZeODl20191105
05-Nov-2019 10:08:19	70	4308.5000	XLON	11003110000036449-E0g2xEUZeQk420191105
05-Nov-2019 10:09:32	67	4310.0000	XLON	11003110000036844-E0g2xEUZeRuN20191105
05-Nov-2019 10:09:32	7	4310.0000	XLON	11003110000036844-E0g2xEUZeRuL20191105
05-Nov-2019 10:11:19	92	4311.0000	XLON	01003010000037544-E0g2xEUZeTQh20191105
05-Nov-2019 10:12:53	84	4310.0000	XLON	01003010000037788-E0g2xEUZeUZI20191105
05-Nov-2019 10:14:28	91	4307.0000	XLON	01003010000038310-E0g2xEUZeW6A20191105
05-Nov-2019 10:16:37	74	4311.5000	XLON	11003110000039133-E0g2xEUZeXmO20191105
05-Nov-2019 10:17:47	71	4315.0000	XLON	11003110000039504-E0g2xEUZeYiw20191105
05-Nov-2019 10:25:04	29	4324.5000	XLON	01003010000042070-E0g2xEUZefKo20191105
05-Nov-2019 10:25:04	42	4324.5000	XLON	01003010000042070-E0g2xEUZefKm20191105
05-Nov-2019 10:26:17	84	4324.0000	XLON	01003010000042390-E0g2xEUZeg7W20191105
05-Nov-2019 10:27:52	71	4326.0000	XLON	11003110000043244-E0g2xEUZehBM20191105
05-Nov-2019 10:29:09	92	4323.5000	XLON	01003010000043713-E0g2xEUZeiDv20191105
05-Nov-2019 10:30:58	70	4322.0000	XLON	01003010000044597-E0g2xEUZek6z20191105
05-Nov-2019 10:31:08	91	4320.0000	XLON	01003010000044744-E0g2xEUZekIB20191105
05-Nov-2019 10:32:11	75	4323.0000	XLON	11003110000045323-E0g2xEUZel9p20191105
05-Nov-2019 10:33:45	76	4320.0000	XLON	11003110000045971-E0g2xEUZemOR20191105
05-Nov-2019 10:37:18	76	4323.5000	XLON	01003010000047207-E0g2xEUZepOv20191105
05-Nov-2019 10:40:20	74	4329.5000	XLON	01003010000048344-E0g2xEUZerYc20191105
05-Nov-2019 10:41:48	74	4329.0000	XLON	01003010000048536-E0g2xEUZesPq20191105
05-Nov-2019 10:42:20	74	4326.5000	XLON	01003010000048964-E0g2xEUZesy620191105
05-Nov-2019 10:45:52	71	4333.0000	XLON	01003010000050324-E0g2xEUZevGv20191105
05-Nov-2019 10:52:22	44	4336.5000	XLON	01003010000052143-E0g2xEUZezoZ20191105

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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