Mirion Technologies, Inc. (MIR)
Every FINRA and SEC series the site collects for Mirion Technologies, Inc.: short interest with days to cover, daily short sale volume, fails to deliver and Form 4 insider trades. Listed on NYSE.
35.9M
Short interest
settlement 2026-08-31
11.0
Days to cover
+10.4% vs prior
84.6%
Short share of volume
2026-09-17
20
Fails to deliver
settlement 2026-08-27
Tue 27 Oct
Next earnings
estimated; last year 2025-10-28
$312K
Insider flow, 90 days
1 buys, 0 sells
As of 2026-09-17.
Short interest
FINRA, twice a month; the last 12 months shown, all 48 settlements in the JSONAs of 31 August 2026, short interest in MIR is 35,906,916 shares, up 1,703,266 shares over the last month. Over the last 48 readings it ranged from 3,670,923 shares (31 October 2024) to 35,906,916 shares (31 August 2026). The latest reading sits at the top of that range. At the reported average volume of 3.3M shares a day that is 11.0 days to cover, a crowded short.
Embed this chartkeeps the attribution line it carries
<iframe src="https://xoomar.com/embed/stocks/mir" width="100%" height="440" style="border:0;max-width:100%" loading="lazy" title="XOOMAR chart"></iframe>
| Settlement | Shares short | Change | Avg daily volume | Days to cover |
|---|---|---|---|---|
| 2026-08-31 | 35,906,916 | +10.4% | 3,273,762 | 10.97 |
| 2026-08-14 | 32,513,654 | -4.9% | 3,805,677 | 8.54 |
| 2026-07-31 | 34,203,650 | -1.3% | 4,593,895 | 7.45 |
| 2026-07-15 | 34,652,952 | -1.4% | 3,543,066 | 9.78 |
| 2026-06-30 | 35,142,853 | +21.3% | 5,519,859 | 6.37 |
| 2026-06-15 | 28,984,088 | -9.3% | 3,123,036 | 9.28 |
| 2026-05-29 | 31,961,185 | +5.9% | 4,777,255 | 6.69 |
| 2026-05-15 | 30,187,748 | +14.0% | 3,354,416 | 9.00 |
| 2026-04-30 | 26,472,596 | +19.2% | 4,362,153 | 6.07 |
| 2026-04-15 | 22,214,772 | -5.9% | 2,861,915 | 7.76 |
| 2026-03-31 | 23,596,990 | +12.3% | 4,020,185 | 5.87 |
| 2026-03-13 | 21,020,735 | +2.9% | 3,433,280 | 6.12 |
| 2026-02-27 | 20,430,102 | +4.0% | 3,622,518 | 5.64 |
| 2026-02-13 | 19,647,434 | -6.7% | 4,529,976 | 4.34 |
| 2026-01-30 | 21,054,700 | +11.7% | 2,003,479 | 10.51 |
| 2026-01-15 | 18,857,131 | -15.2% | 2,635,988 | 7.15 |
| 2025-12-31 | 22,238,139 | +5.4% | 1,887,394 | 11.78 |
| 2025-12-15 | 21,104,501 | -17.8% | 2,924,697 | 7.22 |
| 2025-11-28 | 25,684,851 | +16.1% | 3,595,053 | 7.14 |
| 2025-11-14 | 22,117,086 | -2.2% | 3,989,571 | 5.54 |
| 2025-10-31 | 22,607,386 | -10.0% | 4,649,073 | 4.86 |
| 2025-10-15 | 25,117,809 | -9.1% | 4,072,202 | 6.17 |
| 2025-09-30 | 27,640,652 | +39.4% | 9,242,357 | 2.99 |
| 2025-09-15 | 19,826,990 | +38.9% | 7,135,636 | 2.78 |
Daily short volume
FINRA Reg SHO, last 60 sessions. JSONAs of 17 September 2026, the short share of MIR volume is 84.6%, down 1.4 points over the last five sessions. Over the last 52 readings it ranged from 26.1% (4 August 2026) to 86.2% (10 July 2026). The latest reading sits at the top of that range. The latest reading is 17.8 points above the 30-session average of 66.8%, on 1.1M shares reported.
| Date | Short volume | Total volume | Short share | Exempt |
|---|---|---|---|---|
| 2026-09-17 | 899K | 1.1M | 84.6% | 0 |
| 2026-09-16 | 1.2M | 1.4M | 81.5% | 6,023 |
| 2026-09-15 | 951K | 1.5M | 62.5% | 5 |
| 2026-09-14 | 774K | 957K | 80.8% | 1,280 |
| 2026-09-11 | 725K | 900K | 80.5% | 0 |
| 2026-09-10 | 1.0M | 1.2M | 86.0% | 500 |
| 2026-09-09 | 921K | 1.1M | 85.3% | 28,505 |
| 2026-09-08 | 800K | 1.4M | 56.5% | 751 |
| 2026-09-04 | 1.4M | 1.9M | 73.7% | 0 |
| 2026-09-03 | 1.5M | 2.4M | 63.7% | 0 |
| 2026-09-02 | 726K | 1.3M | 54.6% | 3,644 |
| 2026-09-01 | 1.5M | 2.8M | 52.8% | 501 |
| 2026-08-31 | 1.2M | 1.8M | 68.5% | 0 |
| 2026-08-28 | 753K | 1.0M | 71.7% | 352 |
| 2026-08-27 | 1.4M | 2.0M | 69.5% | 67 |
| 2026-08-26 | 521K | 951K | 54.8% | 0 |
| 2026-08-25 | 963K | 1.7M | 57.2% | 0 |
| 2026-08-24 | 592K | 985K | 60.1% | 2 |
| 2026-08-21 | 579K | 1.6M | 35.7% | 18,249 |
| 2026-08-20 | 721K | 1.0M | 69.7% | 1,099 |
| 2026-08-19 | 478K | 792K | 60.4% | 885 |
| 2026-08-18 | 1.3M | 1.6M | 82.0% | 7 |
| 2026-08-17 | 940K | 1.2M | 80.5% | 11 |
| 2026-08-14 | 1.1M | 1.3M | 82.5% | 3,760 |
| 2026-08-13 | 859K | 1.6M | 54.5% | 0 |
| 2026-08-12 | 450K | 732K | 61.4% | 748 |
| 2026-08-11 | 325K | 658K | 49.4% | 0 |
| 2026-08-10 | 1.2M | 1.8M | 68.1% | 13 |
| 2026-08-07 | 624K | 1.1M | 55.1% | 6,838 |
| 2026-08-06 | 1.2M | 2.0M | 60.3% | 0 |
Fails to deliver
SEC, by settlement date. JSONAs of 27 August 2026, the fails-to-deliver balance in MIR is 20 shares, down 14,980 shares over the last settlement date. Over the last 52 readings it ranged from 20 shares (12 June 2026) to 167,616 shares (31 July 2026). The latest reading sits at the bottom of that range.
| Settlement | Shares failed | Price | Value |
|---|---|---|---|
| 2026-08-27 | 20 | $14.90 | $298 |
| 2026-08-14 | 15,000 | $15.60 | $234K |
| 2026-08-13 | 449 | $15.21 | $7K |
| 2026-08-05 | 130 | $16.17 | $2K |
| 2026-08-04 | 990 | $15.68 | $16K |
| 2026-08-03 | 35,977 | $14.98 | $539K |
| 2026-07-31 | 167,616 | $14.84 | $2.5M |
| 2026-07-30 | 74,756 | $14.57 | $1.1M |
| 2026-07-29 | 34,144 | $16.79 | $573K |
| 2026-07-27 | 2,163 | $16.54 | $36K |
| 2026-06-29 | 609 | $18.45 | $11K |
| 2026-06-24 | 26,516 | $18.78 | $498K |
| 2026-06-23 | 2,592 | $18.54 | $48K |
| 2026-06-22 | 21,384 | $18.61 | $398K |
| 2026-06-18 | 24,176 | $17.65 | $427K |
| 2026-06-12 | 20 | $16.41 | $328 |
| 2026-06-08 | 27 | $17.08 | $461 |
| 2026-06-03 | 362 | $18.04 | $7K |
| 2026-06-02 | 3,836 | $17.81 | $68K |
| 2026-05-26 | 726 | $18.35 | $13K |
| 2026-05-19 | 274 | $18.03 | $5K |
| 2026-05-18 | 466 | $18.17 | $8K |
| 2026-05-12 | 90 | $18.47 | $2K |
| 2026-05-05 | 1,653 | $20.16 | $33K |
| 2026-05-01 | 136,603 | $19.75 | $2.7M |
| 2026-04-30 | 17,446 | $18.66 | $326K |
| 2026-04-23 | 98,816 | $19.33 | $1.9M |
| 2026-04-22 | 34,715 | $19.66 | $682K |
| 2026-04-06 | 2,503 | $19.00 | $48K |
| 2026-04-01 | 338 | $18.59 | $6K |
Insider trades
SEC Form 4, newest first, 50 of 100 shown. JSONInsiders at MIR reported 1 open-market buy worth $312K in the last 90 days and no open-market sells. Clustered voluntary buying is historically the stronger insider signal because insiders buy for one reason. Latest filing: Schopfer Brian (Chief Financial Officer) on 2026-09-02.
| Date | Insider | Title | Type | Shares | Price | Value | Owned after |
|---|---|---|---|---|---|---|---|
| 2026-09-02 | Schopfer Brian | Chief Financial Officer | Buy | 20K | $15.60 | $312K | 933K |
| 2026-06-30 | Kingsley Lawrence D | Director | Grant | 1K | $17.46 | $19K | 73K |
| 2026-05-13 | Rege Sheila | n/a | Grant | 7K | $0.00 | $0 | 50K |
| 2026-05-13 | Markopoulos Jody | n/a | Grant | 7K | $0.00 | $0 | 82K |
| 2026-05-13 | Kingsley Lawrence D | n/a | Grant | 7K | $0.00 | $0 | 71K |
| 2026-05-13 | KUO JOHN W | n/a | Grant | 7K | $0.00 | $0 | 80K |
| 2026-05-13 | Etzel Steven W. | n/a | Grant | 7K | $0.00 | $0 | 87K |
| 2026-05-13 | CASCELLA ROBERT | n/a | Grant | 7K | $0.00 | $0 | 61K |
| 2026-05-13 | Bockhorst Kenneth | n/a | Grant | 7K | $0.00 | $0 | 77K |
| 2026-05-07 | Moore Christopher A. | Chief Accounting Officer (PAO) | Sell | 8K | $19.64 | $165K | 22K |
| 2026-05-06 | Logan Thomas D | Chief Executive Officer | Gift | 312K | $0.00 | $0 | 52K |
| 2026-04-01 | Ulrich Alison | Chief Human Resources Officer | Tax withholding | 2K | $18.59 | $38K | 36K |
| 2026-04-01 | Schopfer Brian | Chief Financial Officer | Tax withholding | 7K | $18.59 | $137K | 913K |
| 2026-04-01 | Moore Christopher A. | Chief Accounting Officer (PAO) | Tax withholding | 2K | $18.59 | $35K | 31K |
| 2026-04-01 | Logan Thomas D | Chief Executive Officer | Tax withholding | 23K | $18.59 | $420K | 364K |
| 2026-04-01 | Lee Emmanuelle | Chief Legal Officer | Tax withholding | 5K | $18.59 | $87K | 82K |
| 2026-03-31 | Kingsley Lawrence D | n/a | Grant | 1K | $17.32 | $19K | 64K |
| 2026-03-02 | Schopfer Brian | Chief Financial Officer | Tax withholding | 28K | $21.61 | $616K | 921K |
| 2026-03-02 | Schopfer Brian | Chief Financial Officer | Grant | 65K | $0.00 | $0 | 949K |
| 2026-03-02 | Logan Thomas D | Chief Executive Officer | Gift | 3.1M | $0.00 | $0 | 387K |
| 2026-03-02 | Logan Thomas D | Chief Executive Officer | Tax withholding | 127K | $21.61 | $2.7M | 3.5M |
| 2026-03-02 | Logan Thomas D | Chief Executive Officer | Grant | 319K | $0.00 | $0 | 3.6M |
| 2026-03-02 | Eloy Loic | Nuclear & Safety President | Grant | 16K | $0.00 | $0 | 113K |
| 2026-03-01 | Schopfer Brian | Chief Financial Officer | Tax withholding | 9K | $21.61 | $198K | 884K |
| 2026-03-01 | Ulrich Alison | Chief Human Resources Officer | Tax withholding | 2K | $21.61 | $51K | 38K |
| 2026-03-01 | Ulrich Alison | Chief Human Resources Officer | Grant | 6K | $0.00 | $0 | 41K |
| 2026-03-01 | Moore Christopher A. | Chief Accounting Officer (PAO) | Tax withholding | 1K | $21.61 | $30K | 32K |
| 2026-03-01 | Moore Christopher A. | Chief Accounting Officer (PAO) | Grant | 6K | $0.00 | $0 | 34K |
| 2026-03-01 | Logan Thomas D | Chief Executive Officer | Tax withholding | 21K | $21.61 | $446K | 3.3M |
| 2026-03-01 | Lee Emmanuelle | Chief Legal Officer | Tax withholding | 3K | $21.61 | $69K | 87K |
| 2026-03-01 | Lee Emmanuelle | Chief Legal Officer | Grant | 12K | $0.00 | $0 | 90K |
| 2025-12-31 | Kingsley Lawrence D | n/a | Grant | 806 | $23.70 | $19K | 63K |
| 2025-12-27 | Schopfer Brian | Chief Financial Officer | Tax withholding | 9K | $23.76 | $202K | 893K |
| 2025-12-27 | Ulrich Alison | Chief Human Resources Officer | Tax withholding | 134 | $23.76 | $3K | 35K |
| 2025-12-27 | Logan Thomas D | Chief Executive Officer | Tax withholding | 40K | $23.76 | $947K | 3.3M |
| 2025-12-27 | Lee Emmanuelle | Chief Legal Officer | Tax withholding | 6K | $23.76 | $140K | 79K |
| 2025-12-11 | KUO JOHN W | n/a | Gift | 5K | $0.00 | $0 | 73K |
| 2025-12-10 | Kingsley Lawrence D | n/a | Sell | 350K | $24.73 | $8.7M | 3.5M |
| 2025-12-08 | Schopfer Brian | Chief Financial Officer | Gift | 100 | $0.00 | $0 | 902K |
| 2025-12-08 | Bockhorst Kenneth | n/a | Gift | 10K | $0.00 | $0 | 70K |
| 2025-12-05 | Schopfer Brian | Chief Financial Officer | Gift | 2K | $0.00 | $0 | 902K |
| 2025-11-24 | Kingsley Lawrence D | n/a | Gift | 41K | $0.00 | $0 | 3.9M |
| 2025-11-21 | Kingsley Lawrence D | n/a | Sell | 300K | $23.83 | $7.1M | 3.9M |
| 2025-11-11 | Eloy Loic | Nuclear & Safety President | Sell | 45K | $27.24 | $1.2M | 98K |
| 2025-11-10 | Lee Emmanuelle | Chief Legal Officer | Sell | 13K | $27.41 | $343K | 85K |
| 2025-11-06 | Schopfer Brian | Chief Financial Officer | Grant | 100K | n/a | n/a | 1.0M |
| 2025-11-06 | Schopfer Brian | Chief Financial Officer | Disposition | 100K | n/a | n/a | 400K |
| 2025-11-06 | Schopfer Brian | Chief Financial Officer | Sell | 50K | $27.66 | $1.4M | 904K |
| 2025-10-30 | Schopfer Brian | Chief Financial Officer | Gift | 15K | $0.00 | $0 | 904K |
| 2025-10-30 | Logan Thomas D | Chief Executive Officer | Gift | 106K | $0.00 | $0 | 3.3M |
Form 4 filings are due within two business days of the trade. Insiders sell for many reasons that say nothing about the company; open-market buys are the rarer, stronger signal.
Planned sales (Form 144)
Newest first. JSON5 Form 144 notices on file for MIR worth $19.1M at the prices reported; 0 in the last 90 days worth $0. Latest: CHRISTOPHER MOORE filed on 2026-05-07 to sell 8,400 shares ($165K) from 2026-05-07.
| Filed | Seller | Shares | Market value | Of outstanding | Sale from | Broker |
|---|---|---|---|---|---|---|
| 2026-05-07 | CHRISTOPHER MOOREOfficer | 8K | $165K | 0.003% | 2026-05-07 | Morgan Stanley Smith Barney LLC Executive Financial Services |
| 2025-12-10 | Lawrence D Kingsley Revocable Trust TTEE Lawrence D Kingsley dtd 3/20/06Director | 350K | $8.8M | 0.143% | 2025-12-10 | UBS Financial Services Inc |
| 2025-11-21 | Lawrence D Kingsley Revocable Trust TTEE Lawrence D Kingsley dtd 3/20/06Director | 300K | $7.1M | 0.122% | 2025-11-21 | UBS Financial Services Inc |
| 2025-11-10 | EMMANUELLE LEEOfficer | 13K | $343K | 0.005% | 2025-11-10 | Morgan Stanley Smith Barney LLC Executive Financial Services |
| 2025-11-06 | Schopfer BrianOfficer | 100K | $2.8M | 0.040% | 2025-11-06 | UBS Financial Services, Inc. |
Large holders (13D and 13G)
One row per reporting person, newest filing first. JSON6 holders above 5% have filed on MIR, all on Schedule 13G (passive). The largest reported stake is BlackRock, Inc. at 14.8% of the class (35,690,382 shares), filed 2025-10-02 for an event on 2025-09-30.
| Filed | Form | Holder | Shares | Of class | Event |
|---|---|---|---|---|---|
| 2026-04-30 | 13G | Vanguard Capital Managementinvestment adviser | 12.3M | 5.0% | 2026-03-31 |
| 2026-04-29 | 13G | Vanguard Portfolio Managementinvestment adviser | 18.1M | 7.4% | 2026-03-31 |
| 2026-03-27 | 13G/Ano. 4 | The Vanguard Groupinvestment adviser | 0 | 0.0% | 2026-03-13 |
| 2026-02-17 | 13G/Ano. 2 | T. Rowe Price Investment Management, Inc.investment adviser | 15.1M | 6.1% | 2025-12-31 |
| 2026-01-21 | 13G/Ano. 1 | Kuwait Investment Authority, acting for and on behalf of the Government of the State of Kuwait (KIA)other entity | 10.2M | 4.1% | 2022-07-29 |
| 2025-10-31 | 13G/Ano. 3 | The Vanguard Groupinvestment adviser | 30.4M | 12.4% | 2025-09-30 |
| 2025-10-02 | 13G/Ano. 1 | BlackRock, Inc.parent holding company | 35.7M | 14.8% | 2025-09-30 |
13F holders
Tracked managers holding MIR at their latest 13F. JSON7 of the 30 tracked managers held MIR at their latest 13F, $63.6M in total at quarter-end prices. Millennium Management is the largest at $17.8M (0.0% of its portfolio) as of 2026-06-30. Over the prior quarter 2 added shares and 5 cut.
| Fund | Quarter | Shares | Value | Of portfolio | Change in shares |
|---|---|---|---|---|---|
| Millennium Management | 2026-06-30 | 992K | $17.8M | 0.01% | -4.4M |
| D. E. Shaw & Co. | 2026-06-30 | 784K | $14.1M | 0.01% | -68K |
| Point72 Asset Management | 2026-06-30 | 678K | $12.2M | 0.01% | +492K |
| Citadel Advisors | 2026-06-30 | 504K | $9.0M | 0.00% | -1.5M |
| Bridgewater Associates | 2026-06-30 | 359K | $6.4M | 0.03% | +7K |
| AQR Capital Management | 2026-06-30 | 208K | $3.7M | 0.00% | -61K |
| Two Sigma Investments | 2026-06-30 | 20K | $354K | 0.00% | -279K |
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
Mirion Technologies, Inc. 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 pulls every series the site collects for one ticker onto one URL, keyed by the SEC's own ticker list, 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 summary sentence built from the rows (last value, change, range with dates) and its own JSON and CSV links. Nothing on the page is written by a model; the sentences change only when the data does. A page exists only for companies with data in at least two series, and every section says when its source last updated.
This page follows Mirion Technologies, Inc. (MIR), SEC CIK 1809987, listed on NYSE. The cross-market tables live on the short interest and insider transactions hubs.
Source and method
- Short interest
- FINRA consolidated short interestTwice a month, about eight business days after settlement. Latest 2026-08-31.JSON and CSV
- Daily short volume
- FINRA Reg SHO daily filesEvery trading day, loaded the following morning. Latest 2026-09-17.JSON and CSV
- Fails to deliver
- SEC fails-to-deliver dataTwice a month, a few weeks after the half month ends. Latest 2026-08-27.JSON and CSV
- Planned sales
- SEC EDGAR Form 144EDGAR read every 30 minutes; a notice is filed on or before the sell order. Latest 2026-05-07.JSON and CSV
- Large holders
- SEC EDGAR Schedule 13D and 13GEDGAR read every 30 minutes; 13D within five business days of crossing 5%, 13G on the passive schedule. Latest 2026-04-30.JSON and CSV
- 13F holders
- SEC EDGAR Form 13F-HRQuarterly, filed within 45 days of quarter end; 30 tracked managers. Latest 2026-06-30.JSON and CSV
- Earnings dates
- SEC EDGAR 8-K Item 2.02 (full-text search)EDGAR full-text search read twice a day; the estimate is last year's date plus 52 weeks. Latest 2026-04-28.JSON and CSV
- Insider trades
- SEC EDGAR Form 4EDGAR read every 30 minutes; filings are due two business days after the trade. Latest 2026-09-02.JSON and CSV
- Company record
- EDGAR filing index for CIK 1809987Ticker, name and exchange from the SEC's company list, refreshed weekly.
- Rate limits
- 30 requests a minute without a key, 120 a minute with a key from a free account.
Data checks. Every dataset is checked against its source once a day. This dataset passed the last run, 18 Sep 05:40 UTC.
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 crowded short are the combination that has historically preceded squeezes; insider sells next to a crowded short 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.
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Datasets
Frequently Asked Questions
How much of MIR is sold short?
What is MIR's daily short volume?
Does MIR have fails to deliver?
Are MIR insiders buying or selling?
Have MIR insiders filed to sell?
Who owns more than 5% of MIR?
Which funds hold MIR?
Data on this page is provided for informational purposes only and is not financial advice. See our editorial policy.