Rio Tinto (RIO)

Rio Tinto on one page: short interest, daily short volume, fails to deliver and 13F holders. Listed on NYSE, classified by the SEC as metal mining.

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9.3M

Short interest

settlement 2026-09-30

5.2

Days to cover

-0.5 days vs prior

39.3%

Short share of volume

2026-10-12

8,753

Fails to deliver

settlement 2026-08-31

As of 2026-10-12.

Short interest

FINRA, twice a month. The newest 24 settlements in the table, 48 in the chart. JSON

As of 30 September 2026, short interest in RIO is 9,329,476 shares, down 702,466 shares over the last month. Over the last 48 readings it ranged from 6,231,867 shares (30 April 2025) to 16,026,618 shares (31 December 2025). At the reported average volume of 1.8M shares a day that is 5.2 days to cover.

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Settlement	Shares short	Change	Avg daily volume	Days to cover
2026-09-30	9,329,476	-4.9%	1,807,778	5.16
2026-09-15	9,810,781	-2.2%	1,737,058	5.65
2026-08-31	10,031,942	+11.6%	2,358,652	4.25
2026-08-14	8,989,331	+13.9%	2,167,855	4.15
2026-07-31	7,888,602	-14.8%	2,980,699	2.65
2026-07-15	9,263,337	-10.5%	2,891,028	3.20
2026-06-30	10,350,517	-12.0%	2,698,056	3.84
2026-06-15	11,757,878	-4.7%	2,812,104	4.18
2026-05-29	12,340,331	+5.0%	2,391,927	5.16
2026-05-15	11,758,168	+3.6%	2,620,713	4.49
2026-04-30	11,350,954	+12.7%	2,421,466	4.69
2026-04-15	10,071,976	-0.8%	2,485,202	4.05
2026-03-31	10,150,098	-15.4%	3,433,828	2.96
2026-03-13	11,998,736	+1.8%	3,538,307	3.39
2026-02-27	11,782,199	-2.0%	3,358,530	3.51
2026-02-13	12,025,661	-3.0%	4,156,102	2.89
2026-01-30	12,400,882	-15.4%	4,436,257	2.80
2026-01-15	14,666,987	-8.5%	5,066,958	2.89
2025-12-31	16,026,618	+6.1%	2,578,823	6.21
2025-12-15	15,103,757	+36.4%	3,816,491	3.96
2025-11-28	11,070,758	-11.3%	2,267,165	4.88
2025-11-14	12,475,930	+8.7%	2,510,601	4.97
2025-10-31	11,475,504	+1.6%	3,454,899	3.32
2025-10-15	11,290,624	+20.2%	3,637,547	3.10

Daily short volume

FINRA Reg SHO, the last 30 sessions. JSON

As of 12 October 2026, the short share of RIO volume is 39.3%, down 7.8 points over the last five sessions. Over the last 30 readings it ranged from 30.8% (17 September 2026) to 59.5% (31 August 2026). The latest reading is 3.9 points below the 30-session average of 43.2%, on 466K shares reported.

Date	Short volume	Total volume	Short share	Exempt
2026-10-12	183K	466K	39.3%	0
2026-10-09	168K	500K	33.6%	1,433
2026-10-08	239K	541K	44.2%	168
2026-10-07	401K	823K	48.8%	761
2026-10-06	352K	685K	51.3%	12
2026-10-05	474K	1.0M	47.1%	2,497
2026-10-02	226K	530K	42.8%	666
2026-10-01	248K	793K	31.3%	4,629
2026-09-30	268K	648K	41.4%	1,305
2026-09-29	268K	571K	46.9%	199
2026-09-28	353K	764K	46.2%	762
2026-09-25	304K	956K	31.9%	519
2026-09-24	339K	667K	50.8%	1,270
2026-09-23	370K	940K	39.4%	225
2026-09-22	168K	482K	34.9%	47
2026-09-21	224K	484K	46.2%	221
2026-09-18	195K	431K	45.2%	150
2026-09-17	138K	449K	30.8%	423
2026-09-16	219K	663K	33.1%	1,340
2026-09-15	237K	695K	34.1%	195
2026-09-14	283K	659K	43.0%	1,290
2026-09-11	224K	530K	42.2%	0
2026-09-10	427K	1.0M	42.4%	513
2026-09-09	182K	570K	31.9%	694
2026-09-08	224K	395K	56.8%	3
2026-09-04	204K	427K	47.7%	195
2026-09-03	329K	639K	51.4%	6
2026-09-02	415K	782K	53.1%	545
2026-09-01	361K	724K	49.8%	1,274
2026-08-31	383K	643K	59.5%	301

Fails to deliver

SEC, the last 30 settlement dates with a fail. JSON

As of 31 August 2026, the fails-to-deliver balance in RIO is 8,753 shares, up 7,658 shares over the last settlement date. Over the last 30 readings it ranged from 1 share (22 April 2026) to 98,493 shares (15 July 2026). The latest reading sits at the bottom of that range.

Settlement	Shares failed	Price	Value
2026-08-31	8,753	$103.30	$904K
2026-08-24	1,095	$105.30	$115K
2026-08-14	9,438	$98.20	$927K
2026-08-12	34,775	$100.99	$3.5M
2026-08-07	120	$99.65	$12K
2026-08-04	100	$95.90	$10K
2026-07-29	72	$91.64	$7K
2026-07-20	850	$90.15	$77K
2026-07-17	13	$90.67	$1K
2026-07-15	98,493	$93.29	$9.2M
2026-07-10	202	$89.49	$18K
2026-06-30	20,165	$94.29	$1.9M
2026-06-22	3,289	$100.08	$329K
2026-06-18	35,170	$102.67	$3.6M
2026-06-17	187	$105.74	$20K
2026-06-10	2,272	$101.42	$230K
2026-06-08	5,393	$100.69	$543K
2026-06-02	20,000	$108.96	$2.2M
2026-06-01	20,000	$106.39	$2.1M
2026-05-29	20,000	$106.47	$2.1M
2026-05-27	1,115	$106.94	$119K
2026-05-18	365	$103.69	$38K
2026-05-15	57,816	$109.59	$6.3M
2026-05-14	2,721	$112.04	$305K
2026-05-13	2,330	$109.50	$255K
2026-05-01	490	$100.48	$49K
2026-04-30	13	$96.49	$1K
2026-04-29	13	$98.49	$1K
2026-04-27	900	$99.61	$90K
2026-04-22	1	$97.72	$98

13F holders

Tracked managers holding RIO at their latest 13F. JSON

8 of the 30 tracked managers held RIO at their latest 13F, $2.20B in total at quarter-end prices. Fisher Asset Management is the largest at $1.96B (0.6% of its portfolio) as of 2026-06-30. Over the prior quarter 6 added shares and 2 cut.

Fund	Quarter	Shares	Value	Of portfolio	Change in shares
Fisher Asset Management	2026-06-30	20.7M	$1.96B	0.58%	+540K
Renaissance Technologies	2026-06-30	1.2M	$115.3M	0.16%	+249K
Two Sigma Investments	2026-06-30	438K	$41.6M	0.03%	new
Millennium Management	2026-06-30	359K	$34.1M	0.01%	+340K
AQR Capital Management	2026-06-30	203K	$19.2M	0.01%	+75K
Citadel Advisors	2026-06-30	120K	$11.4M	0.00%	-135K
Bridgewater Associates	2026-06-30	73K	$6.9M	0.03%	-41K
D. E. Shaw & Co.	2026-06-30	55K	$5.2M	0.00%	+2K

Only the 30 tracked managers on the funds hub; a 13F reports long positions in US listed stock at quarter end, 45 days late, and says nothing about shorts or positions sold since.

What this page is

Rio Tinto in the regulatory record

Regulators publish company data in separate files that never sit next to each other: FINRA's twice-monthly short interest, its daily short sale volume, the SEC's fails-to-deliver counts, and each insider's Form 4. A company page puts those series for one ticker on one URL, with planned sales, large holders, 13F holders and financials beside them, so the short position, the daily flow, the settlement fails and what insiders are doing can be read together.

Each section has its own history table, a one-line summary of the latest figures and its own JSON and CSV links, and says when its source last updated.

This page follows Rio Tinto (RIO), SEC CIK 863064, listed on NYSE, classified by the SEC as metal mining. The cross-market tables live on the short interest and insider transactions hubs.

Source and updates

Short interest: FINRA consolidated short interestSource: FINRA.Twice a month, about eight business days after settlement. Latest 2026-09-30.JSON and CSV
Daily short volume: FINRA Reg SHO daily filesSource: FINRA.Every trading day, the morning after FINRA posts it. Latest 2026-10-12.JSON and CSV
Fails to deliver: SEC fails-to-deliver dataSource: SEC.Twice a month, a few weeks after the half month ends. Latest 2026-08-31.JSON and CSV
13F holders: SEC EDGAR Form 13F-HRSource: SEC.Quarterly, filed within 45 days of quarter end; 30 tracked managers. Latest 2026-06-30.JSON and CSV
Company record: EDGAR filing index for CIK 863064Ticker, name and exchange from the SEC's company list, refreshed weekly.
Rate limits: 10 requests a minute without a key, 30 with a free key from a free account.

How to read it

Read the position against the flow: rising short interest with a high daily short share is new shorting; rising short interest with a normal short share is old shorts holding on.
Insider buys next to a large short position are rare and stand out; insider sells next to one are common and mean little.
Fails to deliver matter relative to the float, not in absolute shares; a million failed shares in a mega cap is noise.

Analysis of what the data shows, not advice. XOOMAR does not recommend buying, selling or holding anything.

Other companies the SEC classifies as metal mining

Other company pages

Datasets

Frequently Asked Questions

How much of RIO is sold short?

9,329,476 shares were held short at the 2026-09-30 settlement, 5.2 days of average volume. FINRA publishes the next count about eight business days after the 15th and the last business day of the month.

What is RIO's daily short volume?

On 2026-10-12, 183,308 of the 466,294 RIO shares reported to FINRA were sold short, 39.3% of the day's reported volume. Short volume is a flow for one day, not a position.

Does RIO have fails to deliver?

The SEC's latest file shows 8,753 RIO shares failed to deliver at settlement 2026-08-31. Fails are reported per settlement date and published twice a month with a lag.

Are RIO insiders buying or selling?

No Form 4 filings for RIO are on record.

Which tracked 13F managers own RIO?

8 of the 30 tracked 13F managers held RIO shares at their latest filing, $2.20B in all. The largest: Ken Fisher's Fisher Asset Management (20.7M shares, $1.96B), Renaissance Technologies (1.2M shares, $115.3M), Two Sigma Investments (438K shares, $41.6M), Izzy Englander's Millennium Management (359K shares, $34.1M), Cliff Asness's AQR Capital Management (203K shares, $19.2M), Ken Griffin's Citadel Advisors (120K shares, $11.4M). The table above lists all 8.

Data on this page is provided for informational purposes only and is not financial advice. See our editorial policy.