Mistras Group (MG)
Mistras Group on one page: short interest, daily short volume, fails to deliver, large holders, 13F holders, earnings dates and insider trades. Listed on NYSE, classified by the SEC as services-engineering services.
938K
Short interest
settlement 2026-09-30
1.3
Days to cover
-3.5 days vs prior
54.1%
Short share of volume
2026-10-23
813
Fails to deliver
settlement 2026-09-24
Tue 3 Nov
Next earnings
estimated date
$0
Insider flow, 90 days
0 buys, 0 sells
As of 2026-10-23.
Short interest
FINRA, twice a month. The newest 48 settlements in the table, 48 in the chart. JSONAs of 30 September 2026, short interest in MG is 938,098 shares, down 159,898 shares over the last month. Over the last 48 readings it ranged from 156,784 shares (29 November 2024) to 1,225,327 shares (15 July 2026). At the reported average volume of 727K shares a day that is 1.3 days to cover.
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| Settlement | Shares short | Change | Avg daily volume | Days to cover |
|---|---|---|---|---|
| 2026-09-30 | 938,098 | -12.7% | 726,681 | 1.29 |
| 2026-09-15 | 1,074,399 | -2.1% | 222,680 | 4.82 |
| 2026-08-31 | 1,097,996 | -5.6% | 248,594 | 4.42 |
| 2026-08-14 | 1,162,719 | -4.0% | 219,369 | 5.30 |
| 2026-07-31 | 1,210,654 | -1.2% | 155,857 | 7.77 |
| 2026-07-15 | 1,225,327 | +29.2% | 180,176 | 6.80 |
| 2026-06-30 | 948,532 | +40.3% | 327,936 | 2.89 |
| 2026-06-15 | 676,268 | +10.9% | 154,025 | 4.39 |
| 2026-05-29 | 609,761 | +17.1% | 164,008 | 3.72 |
| 2026-05-15 | 520,653 | +7.9% | 219,728 | 2.37 |
| 2026-04-30 | 482,492 | -6.3% | 170,116 | 2.84 |
| 2026-04-15 | 514,771 | -7.5% | 127,502 | 4.04 |
| 2026-03-31 | 556,441 | -7.3% | 155,213 | 3.59 |
| 2026-03-13 | 600,027 | +12.2% | 208,302 | 2.88 |
| 2026-02-27 | 534,786 | -21.4% | 132,128 | 4.05 |
| 2026-02-13 | 680,638 | -5.3% | 131,847 | 5.16 |
| 2026-01-30 | 718,412 | +3.3% | 173,596 | 4.14 |
| 2026-01-15 | 695,278 | +3.8% | 208,655 | 3.33 |
| 2025-12-31 | 669,655 | -7.1% | 215,571 | 3.11 |
| 2025-12-15 | 720,840 | +2.7% | 171,169 | 4.21 |
| 2025-11-28 | 701,665 | +2.0% | 150,704 | 4.66 |
| 2025-11-14 | 687,766 | -12.0% | 213,308 | 3.22 |
| 2025-10-31 | 781,474 | +0.3% | 86,210 | 9.06 |
| 2025-10-15 | 779,226 | +4.5% | 97,943 | 7.96 |
| 2025-09-30 | 745,353 | -4.7% | 146,919 | 5.07 |
| 2025-09-15 | 781,705 | +1.8% | 94,282 | 8.29 |
| 2025-08-29 | 767,578 | +0.4% | 108,875 | 7.05 |
| 2025-08-15 | 764,469 | +16.6% | 140,058 | 5.46 |
| 2025-07-31 | 655,608 | -5.2% | 90,813 | 7.22 |
| 2025-07-15 | 691,436 | +18.5% | 96,076 | 7.20 |
| 2025-06-30 | 583,294 | -13.3% | 230,939 | 2.53 |
| 2025-06-13 | 672,763 | +24.4% | 144,232 | 4.66 |
| 2025-05-30 | 540,739 | +11.3% | 146,003 | 3.70 |
| 2025-05-15 | 485,775 | +8.4% | 169,764 | 2.86 |
| 2025-04-30 | 448,087 | +3.8% | 105,736 | 4.24 |
| 2025-04-15 | 431,749 | +25.1% | 181,488 | 2.38 |
| 2025-03-31 | 345,207 | +58.7% | 233,257 | 1.48 |
| 2025-03-14 | 217,570 | +21.6% | 186,306 | 1.17 |
| 2025-02-28 | 178,912 | +11.7% | 97,015 | 1.84 |
| 2025-02-14 | 160,138 | -3.0% | 62,823 | 2.55 |
| 2025-01-31 | 165,129 | -6.1% | 128,016 | 1.29 |
| 2025-01-15 | 175,857 | -21.7% | 104,025 | 1.69 |
| 2024-12-31 | 224,720 | +37.1% | 198,964 | 1.13 |
| 2024-12-13 | 163,886 | +4.5% | 110,691 | 1.48 |
| 2024-11-29 | 156,784 | -15.0% | 107,975 | 1.45 |
| 2024-11-15 | 184,459 | +5.3% | 202,037 | 1.00 |
| 2024-10-31 | 175,136 | -14.4% | 142,351 | 1.23 |
| 2024-10-15 | 204,595 | +83.5% | 116,320 | 1.76 |
Daily short volume
FINRA Reg SHO, the last 30 sessions. JSONAs of 23 October 2026, the short share of MG volume is 54.1%, up 3.8 points over the last five sessions. Over the last 30 readings it ranged from 20.4% (13 October 2026) to 84.6% (17 September 2026). The latest reading is 5.8 points above the 30-session average of 48.3%, on 67K shares reported.
| Date | Short volume | Total volume | Short share | Exempt |
|---|---|---|---|---|
| 2026-10-23 | 36K | 67K | 54.1% | 0 |
| 2026-10-22 | 63K | 99K | 63.7% | 0 |
| 2026-10-21 | 33K | 85K | 39.4% | 0 |
| 2026-10-20 | 26K | 67K | 39.2% | 0 |
| 2026-10-19 | 54K | 89K | 61.0% | 0 |
| 2026-10-16 | 83K | 164K | 50.2% | 0 |
| 2026-10-15 | 37K | 74K | 49.4% | 0 |
| 2026-10-14 | 52K | 133K | 38.8% | 15,871 |
| 2026-10-13 | 41K | 201K | 20.4% | 0 |
| 2026-10-12 | 60K | 206K | 29.3% | 0 |
| 2026-10-09 | 47K | 190K | 24.7% | 0 |
| 2026-10-08 | 33K | 63K | 52.4% | 0 |
| 2026-10-07 | 75K | 119K | 63.4% | 0 |
| 2026-10-06 | 52K | 116K | 44.8% | 0 |
| 2026-10-05 | 43K | 189K | 22.8% | 0 |
| 2026-10-02 | 50K | 139K | 36.1% | 236 |
| 2026-10-01 | 49K | 204K | 23.8% | 11 |
| 2026-09-30 | 63K | 136K | 46.6% | 941 |
| 2026-09-29 | 50K | 108K | 46.5% | 0 |
| 2026-09-28 | 45K | 106K | 42.7% | 0 |
| 2026-09-25 | 56K | 117K | 47.7% | 0 |
| 2026-09-24 | 97K | 151K | 64.0% | 0 |
| 2026-09-23 | 136K | 250K | 54.5% | 0 |
| 2026-09-22 | 134K | 281K | 47.6% | 0 |
| 2026-09-21 | 155K | 308K | 50.4% | 1,926 |
| 2026-09-18 | 288K | 964K | 29.9% | 3 |
| 2026-09-17 | 361K | 427K | 84.6% | 0 |
| 2026-09-16 | 58K | 76K | 76.4% | 0 |
| 2026-09-15 | 49K | 72K | 68.0% | 0 |
| 2026-09-14 | 47K | 61K | 76.6% | 0 |
Fails to deliver
SEC, the last 30 settlement dates with a fail. JSONAs of 24 September 2026, the fails-to-deliver balance in MG is 813 shares, down 3,036 shares over the last settlement date. Over the last 30 readings it ranged from 1 share (4 August 2026) to 74,416 shares (30 June 2026). The latest reading sits at the bottom of that range.
| Settlement | Shares failed | Price | Value |
|---|---|---|---|
| 2026-09-24 | 813 | $20.94 | $17K |
| 2026-09-15 | 3,849 | $19.53 | $75K |
| 2026-09-08 | 1,151 | $19.12 | $22K |
| 2026-08-27 | 42 | $18.80 | $790 |
| 2026-08-04 | 1 | $15.70 | $16 |
| 2026-07-27 | 1,502 | $15.46 | $23K |
| 2026-07-22 | 722 | $15.73 | $11K |
| 2026-07-20 | 115 | $15.71 | $2K |
| 2026-07-17 | 580 | $15.92 | $9K |
| 2026-07-10 | 341 | $16.29 | $6K |
| 2026-07-08 | 601 | $16.63 | $10K |
| 2026-07-02 | 449 | $17.14 | $8K |
| 2026-07-01 | 456 | $17.47 | $8K |
| 2026-06-30 | 74,416 | $18.23 | $1.4M |
| 2026-06-29 | 333 | $18.82 | $6K |
| 2026-06-04 | 102 | $17.60 | $2K |
| 2026-06-01 | 279 | $17.58 | $5K |
| 2026-05-15 | 176 | $16.94 | $3K |
| 2026-05-14 | 373 | $17.18 | $6K |
| 2026-05-13 | 2,247 | $16.85 | $38K |
| 2026-04-13 | 99 | $16.70 | $2K |
| 2026-03-26 | 331 | $15.10 | $5K |
| 2026-03-25 | 303 | $14.91 | $5K |
| 2026-03-05 | 12,991 | $15.68 | $204K |
| 2026-02-20 | 951 | $14.84 | $14K |
| 2026-02-09 | 497 | $14.67 | $7K |
| 2026-01-23 | 3,284 | $14.39 | $47K |
| 2025-11-18 | 5 | $12.08 | $60 |
| 2025-11-07 | 260 | $11.63 | $3K |
| 2025-10-14 | 3,379 | $9.53 | $32K |
Insider trades
SEC Form 4, newest first. JSONNo open-market insider trades were reported for MG in the last 90 days. The most recent filings are listed below. Latest filing: D'Alterio Gennaro A. (EVP, Chief Commercial Officer) on 2026-09-20.
| Date | Insider | Title | Type | Shares | Price | Value | Owned after |
|---|---|---|---|---|---|---|---|
| 2026-09-20 | D'Alterio Gennaro A. | EVP, Chief Commercial Officer | Tax withholding | 662 | $20.75 | $14K | 47K |
| 2026-09-18 | Coggins Eileen Mary | Chief Legal Officer | Tax withholding | 2K | $19.66 | $32K | 13K |
| 2026-09-10 | Vahaviolos Aspasia Felice | 10% owner | Gift | 387K | $0.00 | $0 | 2.2M |
| 2026-09-10 | Foglia Stephanie Athena | 10% owner | Gift | 387K | $0.00 | $0 | 3.9M |
| 2026-09-08 | SHUMAN-FABBRI NATALIA | President and CEO | Tax withholding | 2K | $19.42 | $47K | 124K |
| 2026-06-10 | Vahaviolos Aspasia Felice | TenPercentOwner | Gift | 412K | $0.00 | $0 | 1.8M |
| 2026-06-10 | Foglia Stephanie Athena | 10% owner | Gift | 412K | $0.00 | $0 | 4.3M |
| 2026-05-19 | PIZZI CHARLES P | Director | Grant | 7K | $0.00 | $0 | 73K |
| 2026-05-19 | Lohmeier Michelle | Director | Grant | 7K | $0.00 | $0 | 99K |
| 2026-05-19 | GLANTON RICHARD H | Director | Grant | 7K | $0.00 | $0 | 68K |
| 2026-05-19 | FORESE JAMES J | Director | Grant | 7K | $0.00 | $0 | 177K |
| 2026-05-19 | DEBENEDICTIS NICHOLAS | Director | Grant | 7K | $0.00 | $0 | 249K |
| 2026-04-27 | Foglia Stephanie Athena | 10% owner | Gift | 529K | $0.00 | $0 | 4.7M |
| 2026-04-17 | Foglia Stephanie Athena | 10% owner | Sell | 1K | $18.00 | $18K | 2K |
| 2026-03-26 | Hammad Hanei Wail | EVP & Chief Operating Officer | Tax withholding | 3K | $15.10 | $43K | 62K |
| 2026-03-22 | Prajzner Edward J | Sr. EVP and CFO | Tax withholding | 1K | $14.05 | $19K | 148K |
| 2026-03-16 | Prajzner Edward J | Sr. EVP and CFO | Tax withholding | 2K | $14.61 | $33K | 149K |
| 2026-03-07 | Prajzner Edward J | Sr. EVP and CFO | Tax withholding | 3K | $14.82 | $38K | 152K |
| 2026-03-04 | Stamatakis Manuel N. | Executive Chairman | Tax withholding | 814 | $15.68 | $13K | 510K |
| 2026-03-04 | Prajzner Edward J | Sr. EVP and CFO | Tax withholding | 698 | $15.68 | $11K | 154K |
| 2026-03-04 | Hammad Hanei Wail | EVP & Chief Operating Officer | Tax withholding | 337 | $15.68 | $5K | 65K |
| 2026-03-04 | D'Alterio Gennaro A. | EVP, Chief Commercial Officer | Tax withholding | 184 | $15.68 | $3K | 47K |
| 2026-03-03 | Foglia Stephanie Athena | 10% owner | Sell | 1K | $15.50 | $16K | 3K |
| 2026-02-28 | D'Alterio Gennaro A. | EVP, Chief Commercial Officer | Tax withholding | 862 | $15.28 | $13K | 47K |
| 2026-02-28 | D'Alterio Gennaro A. | EVP, Chief Commercial Officer | Tax withholding | 655 | $15.28 | $10K | 48K |
| 2026-02-28 | Prajzner Edward J | Sr. EVP and CFO | Tax withholding | 1K | $15.28 | $20K | 155K |
| 2026-02-25 | D'Alterio Gennaro A. | EVP, Chief Commercial Officer | Grant | 20K | $0.00 | $0 | 49K |
| 2026-02-25 | Hammad Hanei Wail | EVP & Chief Operating Officer | Grant | 30K | $0.00 | $0 | 88K |
| 2026-02-25 | Coggins Eileen Mary | EVP, General Counsel | Grant | 7K | $0.00 | $0 | 22K |
| 2026-02-25 | SHUMAN-FABBRI NATALIA | President and CEO | Grant | 101K | $0.00 | $0 | 126K |
| 2026-02-25 | Stamatakis Manuel N. | Executive Chairman | Grant | 86K | $0.00 | $0 | 511K |
| 2026-02-25 | Prajzner Edward J | Sr. EVP and CFO | Grant | 37K | $0.00 | $0 | 156K |
| 2026-02-03 | Foglia Stephanie Athena | 10% owner | Sell | 1K | $14.60 | $15K | 4K |
| 2026-01-05 | Prajzner Edward J | Sr. EVP and CFO | Tax withholding | 3K | $12.65 | $34K | 119K |
| 2026-01-05 | Foglia Stephanie Athena | 10% owner | Sell | 1K | $13.60 | $14K | 5K |
| 2026-01-02 | Stamatakis Manuel N. | Executive Chairman | Grant | 40K | $0.00 | $0 | 424K |
| 2025-12-31 | Vahaviolos Aspasia Felice | 10% owner | Gift | 5.3M | $0.00 | $0 | 854K |
| 2025-12-31 | Vahaviolos Aspasia Felice | 10% owner | Gift | 529K | $0.00 | $0 | 1.4M |
| 2025-12-04 | PIZZI CHARLES P | Director | Gift | 2K | $0.00 | $0 | 67K |
| 2025-09-24 | D'Alterio Gennaro A. | EVP, Chief Commercial Officer | Tax withholding | 475 | $9.53 | $5K | 29K |
| 2025-09-15 | Coggins Eileen Mary | EVP & Chief Legal Officer | Grant | 15K | $0.00 | $0 | 15K |
| 2025-09-15 | Coggins Eileen Mary | EVP & Chief Legal Officer | Buy | 15K | $9.55 | $143K | 15K |
| 2025-09-08 | SHUMAN-FABBRI NATALIA | President and CEO | Grant | 25K | $0.00 | $0 | 25K |
| 2025-07-02 | Vahaviolos Aspasia Felice | 10% owner | Inheritance | 2.2M | $0.00 | $0 | 6.1M |
| 2025-07-02 | Sotirios Vahaviolos January 2023 2-Year Grantor Retained Annuity Trust | 10% owner | Gift | 4.7M | $0.00 | $0 | 0 |
| 2025-06-05 | Stamatakis Manuel N. | Executive Chairman | Buy | 10K | $7.71 | $77K | 384K |
| 2025-05-19 | Lohmeier Michelle | Director | Grant | 14K | $0.00 | $0 | 92K |
| 2025-05-19 | GLANTON RICHARD H | Director | Grant | 14K | $0.00 | $0 | 62K |
| 2025-05-19 | FORESE JAMES J | Director | Grant | 14K | $0.00 | $0 | 170K |
| 2025-05-19 | DEBENEDICTIS NICHOLAS | Director | Grant | 14K | $0.00 | $0 | 242K |
| 2025-05-19 | PIZZI CHARLES P | Director | Grant | 14K | $0.00 | $0 | 69K |
| 2025-03-25 | Hammad Hanei Wail | EVP & Chief Operating Officer | Tax withholding | 6K | $10.79 | $69K | 59K |
| 2025-03-25 | Hammad Hanei Wail | EVP & Chief Operating Officer | Returned to company | 6K | $10.79 | $69K | 59K |
| 2025-03-20 | DEBENEDICTIS NICHOLAS | Director | Buy | 1K | $10.01 | $10K | 228K |
| 2025-03-19 | Prajzner Edward J | Sr. EVP and CFO | Tax withholding | 1K | $9.84 | $13K | 122K |
| 2025-03-19 | Prajzner Edward J | Sr. EVP and CFO | Tax withholding | 1K | $10.00 | $15K | 123K |
| 2025-03-19 | Prajzner Edward J | Sr. EVP and CFO | Tax withholding | 626 | $10.00 | $6K | 125K |
| 2025-03-19 | Stamatakis Manuel N. | Executive Chairman | Buy | 10K | $9.95 | $100K | 374K |
| 2025-03-19 | DEBENEDICTIS NICHOLAS | Director | Buy | 9K | $10.04 | $90K | 226K |
| 2025-03-19 | Keefe Michael C | EVP, General Counsel | Tax withholding | 1K | $9.84 | $10K | 92K |
| 2025-03-19 | Keefe Michael C | EVP, General Counsel | Tax withholding | 762 | $10.00 | $8K | 93K |
| 2025-03-19 | D'Alterio Gennaro A. | EVP, Chief Commercial Officer | Tax withholding | 655 | $9.84 | $6K | 30K |
| 2025-03-18 | DEBENEDICTIS NICHOLAS | Director | Buy | 10K | $9.84 | $98K | 218K |
| 2025-03-05 | Hammad Hanei Wail | EVP & Chief Operating Officer | Grant | 15K | $0.00 | $0 | 62K |
| 2025-03-05 | Hammad Hanei Wail | EVP & Chief Operating Officer | Grant | 3K | $0.00 | $0 | 65K |
| 2025-03-05 | D'Alterio Gennaro A. | EVP, Chief Commercial Officer | Grant | 11K | $0.00 | $0 | 28K |
| 2025-03-05 | D'Alterio Gennaro A. | EVP, Chief Commercial Officer | Grant | 2K | $0.00 | $0 | 30K |
| 2025-03-05 | Prajzner Edward J | Sr. EVP and CFO | Grant | 5K | $0.00 | $0 | 125K |
| 2025-03-05 | Prajzner Edward J | Sr. EVP and CFO | Grant | 23K | $0.00 | $0 | 121K |
| 2025-03-05 | Keefe Michael C | EVP, General Counsel | Grant | 10K | $0.00 | $0 | 92K |
| 2025-03-05 | Keefe Michael C | EVP, General Counsel | Grant | 2K | $0.00 | $0 | 93K |
| 2025-03-05 | Stamatakis Manuel N. | Executive Chairman | Grant | 6K | $0.00 | $0 | 364K |
| 2025-01-06 | D'Alterio Gennaro A. | EVP, Chief Commercial Officer | Tax withholding | 571 | $11.28 | $6K | 17K |
| 2025-01-06 | Prajzner Edward J | Sr. EVP and CFO | Tax withholding | 3K | $9.06 | $25K | 98K |
| 2025-01-06 | Keefe Michael C | EVP, General Counsel | Tax withholding | 3K | $9.06 | $29K | 81K |
| 2024-09-25 | Lange Michael J. | Senior EVP | Sell | 6K | $11.17 | $68K | 241K |
| 2024-09-24 | Lange Michael J. | Senior EVP | Sell | 19K | $11.36 | $211K | 247K |
| 2024-09-23 | Lange Michael J. | Senior EVP | Sell | 13K | $10.79 | $138K | 265K |
| 2024-09-20 | Lange Michael J. | Senior EVP | Sell | 25K | $11.02 | $272K | 278K |
| 2024-09-19 | Lange Michael J. | Senior EVP | Sell | 12K | $10.80 | $127K | 303K |
| 2024-09-18 | Lange Michael J. | Senior EVP | Sell | 5K | $10.74 | $54K | 315K |
| 2024-09-17 | Lange Michael J. | Senior EVP | Sell | 14K | $10.64 | $147K | 320K |
| 2024-09-16 | Lange Michael J. | Senior EVP | Sell | 7K | $10.58 | $76K | 333K |
| 2024-08-07 | PIZZI CHARLES P | Director | Grant | 6K | $0.00 | $0 | 54K |
| 2024-08-07 | GLANTON RICHARD H | Director | Grant | 6K | $0.00 | $0 | 48K |
| 2024-08-07 | Lohmeier Michelle | Director | Grant | 6K | $0.00 | $0 | 78K |
| 2024-08-07 | FORESE JAMES J | Director | Grant | 6K | $0.00 | $0 | 156K |
| 2024-08-07 | DEBENEDICTIS NICHOLAS | Director | Grant | 6K | $0.00 | $0 | 208K |
| 2024-07-03 | GLANTON RICHARD H | Director | Gift | 700 | $0.00 | $0 | 41K |
| 2024-07-03 | GLANTON RICHARD H | Director | Gift | 700 | $0.00 | $0 | 3K |
| 2024-06-20 | GLANTON RICHARD H | Director | Sell | 21K | $7.68 | $161K | 42K |
| 2024-05-14 | Stamatakis Manuel N. | Interim President and CEO | Grant | 125K | $0.00 | $0 | 359K |
| 2024-04-03 | Keefe Michael C | EVP, General Counsel | Tax withholding | 789 | $9.31 | $7K | 84K |
| 2024-04-03 | Keefe Michael C | EVP, General Counsel | Tax withholding | 461 | $9.30 | $4K | 85K |
| 2024-04-03 | Lange Michael J. | Senior EVP | Tax withholding | 726 | $9.31 | $7K | 341K |
| 2024-04-03 | Lange Michael J. | Senior EVP | Tax withholding | 597 | $9.30 | $6K | 341K |
| 2024-04-03 | Smith John Anthony | Executive Vice President | Tax withholding | 1K | $9.67 | $10K | 100K |
| 2024-04-03 | Prajzner Edward J | Sr. EVP and CFO | Tax withholding | 838 | $9.31 | $8K | 101K |
| 2024-04-03 | Prajzner Edward J | Sr. EVP and CFO | Tax withholding | 417 | $9.30 | $4K | 101K |
| 2024-03-26 | Hammad Hanei Wail | EVP & Chief Transformation Off | Grant | 47K | $0.00 | $0 | 47K |
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 rarer.
Large holders (13D and 13G)
One row per reporting person with its latest filing, newest first. JSON9 holders report 5% or more of MG in their latest filing, 7 on Schedule 13D (active intent). The largest reported stake is Aspasia Vahaviolos at 19.3% of the class (6,105,650 shares), filed 2026-03-31 for an event on 2025-12-31.
| Filed | Form | Holder | Shares | Of class | Event |
|---|---|---|---|---|---|
| 2026-10-07 | 13D/Ano. 5 | Aspasia Felice Vahaviolosindividual | 6.1M | 19.1% | 2026-09-17 |
| 2026-10-07 | 13D/Ano. 5 | Stephanie Athena Fogliaindividual | 5.5M | 17.4% | 2026-09-17 |
| 2026-10-07 | 13D/Ano. 5 | 2025 Irrevocable Two-Year Grantor Retained Annuity Trust of Aspasia F. Vahaviolosother entity | 3.9M | 12.3% | 2026-09-17 |
| 2026-09-18 | 13D/Ano. 3 | Thomas E. Lynchparent holding company, individual | 1.9M | 6.1% | 2026-09-16 |
| 2026-09-18 | 13D/Ano. 3 | Mill Road Capital III GP LLCparent holding company, other entity | 1.9M | 6.1% | 2026-09-16 |
| 2026-09-18 | 13D/Ano. 3 | Mill Road Capital III, L.P.partnership | 1.9M | 6.1% | 2026-09-16 |
| 2026-06-12 | 13D/Ano. 2 | Stephanie Fogliaindividual | 5.9M | 18.6% | 2026-06-10 |
| 2026-03-31 | 13G | Aspasia Vahaviolosindividual | 6.1M | 19.3% | 2025-12-31 |
| 2026-03-31 | 13G/Ano. 1 | Kristy Kyriakopoulosindividual | 1.6M | 5.1% | 2025-07-08 |
13F holders
Tracked managers holding MG at their latest 13F. JSON5 of the 30 tracked managers held MG at their latest 13F, $8.5M in total at quarter-end prices. Citadel Advisors is the largest at $2.6M (0.0% of its portfolio) as of 2026-06-30. Over the prior quarter 2 added shares and 3 cut.
| Fund | Quarter | Shares | Value | Of portfolio | Change in shares |
|---|---|---|---|---|---|
| Citadel Advisors | 2026-06-30 | 151K | $2.6M | 0.00% | +25K |
| Two Sigma Investments | 2026-06-30 | 149K | $2.6M | 0.00% | -82K |
| Renaissance Technologies | 2026-06-30 | 103K | $1.8M | 0.00% | -18K |
| D. E. Shaw & Co. | 2026-06-30 | 44K | $773K | 0.00% | -42K |
| AQR Capital Management | 2026-06-30 | 37K | $651K | 0.00% | +16K |
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
Mistras Group 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 Mistras Group (MG), SEC CIK 1436126, listed on NYSE, classified by the SEC as services-engineering services. 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 2026-10-23.JSON and CSV
- Fails to deliver
- SEC fails-to-deliver dataSource: SEC.Twice a month, a few weeks after the half month ends. Latest 2026-09-24.JSON and CSV
- Large holders
- SEC EDGAR Schedule 13D and 13GSource: SEC.New filings appear shortly after the SEC posts them. A 13D is due within five business days of crossing 5%; a 13G follows the passive schedule. Latest 2026-10-07.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
- Earnings dates
- SEC EDGAR 8-K filings (Item 2.02)Source: SEC.Twice a day. Reported dates come from the company's 8-K filings; the next date is marked as an estimate until the 8-K arrives. Latest 2026-08-10.JSON and CSV
- Insider trades
- SEC EDGAR Form 4Source: SEC.New filings appear shortly after the SEC posts them; they're due two business days after the trade. Latest 2026-09-20.JSON and CSV
- Company record
- EDGAR filing index for CIK 1436126Ticker, 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 services-engineering services
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Datasets
Frequently Asked Questions
How much of MG is sold short?
938,098 shares were held short at the 2026-09-30 settlement, 1.3 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 MG's daily short volume?
On 2026-10-23, 36,343 of the 67,209 MG shares reported to FINRA were sold short, 54.1% of the day's reported volume. Short volume is a flow for one day, not a position.
Does MG have fails to deliver?
The SEC's latest file shows 813 MG shares failed to deliver at settlement 2026-09-24. Fails are reported per settlement date and published twice a month with a lag.
Are MG insiders buying or selling?
No open-market insider trades were reported for MG in the last 90 days. The most recent filings are listed below. Latest filing: D'Alterio Gennaro A. (EVP, Chief Commercial Officer) on 2026-09-20.
Who owns 5% or more of MG?
9 holders report 5% or more of MG in their latest filing, 7 on Schedule 13D (active intent). The largest reported stake is Aspasia Vahaviolos at 19.3% of the class (6,105,650 shares), filed 2026-03-31 for an event on 2025-12-31.
Which tracked 13F managers own MG?
5 of the 30 tracked 13F managers held MG shares at their latest filing, $8.5M in all. The largest: Ken Griffin's Citadel Advisors (151K shares, $2.6M), Two Sigma Investments (149K shares, $2.6M), Renaissance Technologies (103K shares, $1.8M), D. E. Shaw & Co. (44K shares, $773K), Cliff Asness's AQR Capital Management (37K shares, $651K).
Data on this page is provided for informational purposes only and is not financial advice. See our editorial policy.