MeiraGTx Holdings (MGTX)
MeiraGTx Holdings on one page: short interest, daily short volume, fails to deliver, planned sales, large holders, 13F holders, earnings dates and insider trades. Listed on Nasdaq, classified by the SEC as biological products, (no diagnostic substances).
6.4M
Short interest
settlement 2026-10-15
6.5
Days to cover
+1.5 days vs prior
70.0%
Short share of volume
2026-11-02
30
Fails to deliver
settlement 2026-10-13
Thu 12 Nov
Next earnings
estimated date
-$1.7M
Insider flow, 90 days
0 buys, 3 sells
As of 2026-11-02.
Short interest
FINRA, twice a month. The newest 48 settlements in the table, 48 in the chart. JSONAs of 15 October 2026, short interest in MGTX is 6,438,544 shares, up 2,426,726 shares over the last month. Over the last 48 readings it ranged from 1,484,372 shares (29 November 2024) to 6,438,544 shares (15 October 2026). The latest reading sits at the top of that range. At the reported average volume of 989K shares a day that is 6.5 days to cover.
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| Settlement | Shares short | Change | Avg daily volume | Days to cover |
|---|---|---|---|---|
| 2026-10-15 | 6,438,544 | +7.4% | 988,768 | 6.51 |
| 2026-09-30 | 5,996,760 | +49.5% | 1,190,432 | 5.04 |
| 2026-09-15 | 4,011,818 | +7.8% | 659,584 | 6.08 |
| 2026-08-31 | 3,723,321 | -0.4% | 795,829 | 4.68 |
| 2026-08-14 | 3,738,795 | -4.1% | 463,568 | 8.07 |
| 2026-07-31 | 3,897,920 | -7.5% | 471,590 | 8.27 |
| 2026-07-15 | 4,215,627 | -10.6% | 1,152,342 | 3.66 |
| 2026-06-30 | 4,717,099 | -15.0% | 1,562,749 | 3.02 |
| 2026-06-15 | 5,548,337 | +2.9% | 606,491 | 9.15 |
| 2026-05-29 | 5,391,888 | -0.9% | 1,048,793 | 5.14 |
| 2026-05-15 | 5,438,716 | -5.1% | 525,303 | 10.35 |
| 2026-04-30 | 5,731,677 | +23.9% | 1,334,763 | 4.29 |
| 2026-04-15 | 4,627,936 | -10.2% | 800,143 | 5.78 |
| 2026-03-31 | 5,153,102 | -2.8% | 644,648 | 7.99 |
| 2026-03-13 | 5,299,752 | +4.5% | 442,824 | 11.97 |
| 2026-02-27 | 5,069,953 | -2.2% | 258,209 | 19.64 |
| 2026-02-13 | 5,186,361 | -4.8% | 369,640 | 14.03 |
| 2026-01-30 | 5,449,351 | -4.5% | 421,336 | 12.93 |
| 2026-01-15 | 5,705,628 | +8.2% | 421,495 | 13.54 |
| 2025-12-31 | 5,271,403 | +7.3% | 398,405 | 13.23 |
| 2025-12-15 | 4,914,236 | +16.3% | 608,456 | 8.08 |
| 2025-11-28 | 4,224,612 | +9.4% | 679,040 | 6.22 |
| 2025-11-14 | 3,861,291 | +1.4% | 668,704 | 5.77 |
| 2025-10-31 | 3,806,060 | +5.9% | 408,414 | 9.32 |
| 2025-10-15 | 3,592,850 | -4.3% | 415,682 | 8.64 |
| 2025-09-30 | 3,754,762 | +1.8% | 345,213 | 10.88 |
| 2025-09-15 | 3,687,680 | +5.4% | 327,606 | 11.26 |
| 2025-08-29 | 3,499,139 | +7.6% | 255,548 | 13.69 |
| 2025-08-15 | 3,252,743 | -1.3% | 392,976 | 8.28 |
| 2025-07-31 | 3,295,849 | -7.1% | 661,200 | 4.98 |
| 2025-07-15 | 3,549,393 | -4.8% | 664,876 | 5.34 |
| 2025-06-30 | 3,730,140 | +1.7% | 413,959 | 9.01 |
| 2025-06-13 | 3,669,151 | +17.2% | 482,109 | 7.61 |
| 2025-05-30 | 3,131,445 | +10.5% | 463,250 | 6.76 |
| 2025-05-15 | 2,833,373 | +17.3% | 790,165 | 3.59 |
| 2025-04-30 | 2,416,618 | +0.2% | 405,915 | 5.95 |
| 2025-04-15 | 2,411,597 | +25.4% | 792,480 | 3.04 |
| 2025-03-31 | 1,923,387 | -1.9% | 540,616 | 3.56 |
| 2025-03-14 | 1,960,488 | -0.9% | 1,034,008 | 1.90 |
| 2025-02-28 | 1,979,377 | -3.3% | 404,549 | 4.89 |
| 2025-02-14 | 2,047,719 | -1.4% | 240,863 | 8.50 |
| 2025-01-31 | 2,076,094 | +3.7% | 281,220 | 7.38 |
| 2025-01-15 | 2,001,516 | +8.5% | 306,988 | 6.52 |
| 2024-12-31 | 1,845,212 | +11.5% | 334,820 | 5.51 |
| 2024-12-13 | 1,654,236 | +11.4% | 214,204 | 7.72 |
| 2024-11-29 | 1,484,372 | -0.6% | 210,552 | 7.05 |
| 2024-11-15 | 1,493,213 | -10.1% | 438,580 | 3.40 |
| 2024-10-31 | 1,660,883 | -6.9% | 341,678 | 4.86 |
Daily short volume
FINRA Reg SHO, the last 30 sessions. JSONAs of 2 November 2026, the short share of MGTX volume is 70.0%, down 10.9 points over the last five sessions. Over the last 30 readings it ranged from 39.2% (19 October 2026) to 80.9% (26 October 2026). The latest reading is 4.3 points above the 30-session average of 65.7%, on 148K shares reported.
| Date | Short volume | Total volume | Short share | Exempt |
|---|---|---|---|---|
| 2026-11-02 | 103K | 148K | 70.0% | 0 |
| 2026-10-30 | 101K | 134K | 75.7% | 1,000 |
| 2026-10-29 | 54K | 116K | 46.7% | 0 |
| 2026-10-28 | 103K | 186K | 55.2% | 0 |
| 2026-10-27 | 117K | 224K | 52.3% | 0 |
| 2026-10-26 | 127K | 157K | 80.9% | 0 |
| 2026-10-23 | 127K | 222K | 57.1% | 0 |
| 2026-10-22 | 95K | 129K | 74.1% | 0 |
| 2026-10-21 | 170K | 262K | 64.8% | 0 |
| 2026-10-20 | 173K | 289K | 60.0% | 18,141 |
| 2026-10-19 | 110K | 281K | 39.2% | 0 |
| 2026-10-16 | 165K | 258K | 64.0% | 0 |
| 2026-10-15 | 197K | 311K | 63.3% | 0 |
| 2026-10-14 | 276K | 430K | 64.3% | 0 |
| 2026-10-13 | 244K | 327K | 74.6% | 0 |
| 2026-10-12 | 122K | 189K | 64.5% | 0 |
| 2026-10-09 | 112K | 186K | 60.3% | 0 |
| 2026-10-08 | 182K | 297K | 61.4% | 0 |
| 2026-10-07 | 338K | 424K | 79.6% | 0 |
| 2026-10-06 | 257K | 386K | 66.5% | 0 |
| 2026-10-05 | 266K | 344K | 77.4% | 0 |
| 2026-10-02 | 217K | 271K | 80.2% | 0 |
| 2026-10-01 | 177K | 277K | 64.1% | 0 |
| 2026-09-30 | 156K | 311K | 50.3% | 0 |
| 2026-09-29 | 164K | 269K | 60.9% | 0 |
| 2026-09-28 | 261K | 364K | 71.8% | 0 |
| 2026-09-25 | 355K | 493K | 71.9% | 0 |
| 2026-09-24 | 247K | 369K | 67.0% | 700 |
| 2026-09-23 | 249K | 342K | 72.7% | 0 |
| 2026-09-22 | 341K | 429K | 79.4% | 0 |
Fails to deliver
SEC, the last 30 settlement dates with a fail. JSONAs of 13 October 2026, the fails-to-deliver balance in MGTX is 30 shares, down 1,279 shares over the last settlement date. Over the last 30 readings it ranged from 4 shares (13 April 2026) to 331,744 shares (17 April 2026). The latest reading sits at the bottom of that range.
| Settlement | Shares failed | Price | Value |
|---|---|---|---|
| 2026-10-13 | 30 | $10.38 | $311 |
| 2026-10-08 | 1,309 | $10.82 | $14K |
| 2026-09-11 | 220 | $12.85 | $3K |
| 2026-08-27 | 5,962 | $14.56 | $87K |
| 2026-08-25 | 2,447 | $14.83 | $36K |
| 2026-08-19 | 491 | $13.89 | $7K |
| 2026-08-18 | 1,519 | $13.77 | $21K |
| 2026-08-13 | 8,803 | $12.96 | $114K |
| 2026-08-04 | 1,926 | $11.88 | $23K |
| 2026-08-03 | 1,963 | $11.79 | $23K |
| 2026-07-15 | 30,000 | $12.44 | $373K |
| 2026-07-10 | 400 | $13.94 | $6K |
| 2026-06-22 | 11,264 | $11.32 | $128K |
| 2026-06-15 | 299 | $9.59 | $3K |
| 2026-06-10 | 3,373 | $9.21 | $31K |
| 2026-06-08 | 16,194 | $9.00 | $146K |
| 2026-06-03 | 2,039 | $9.24 | $19K |
| 2026-05-29 | 143 | $10.00 | $1K |
| 2026-05-28 | 2,156 | $9.89 | $21K |
| 2026-05-27 | 4,473 | $9.60 | $43K |
| 2026-05-21 | 1,674 | $9.58 | $16K |
| 2026-05-15 | 817 | $9.95 | $8K |
| 2026-05-01 | 3,320 | $9.22 | $31K |
| 2026-04-22 | 1,138 | $10.17 | $12K |
| 2026-04-17 | 331,744 | $9.48 | $3.1M |
| 2026-04-15 | 5,226 | $11.29 | $59K |
| 2026-04-14 | 919 | $9.63 | $9K |
| 2026-04-13 | 4 | $8.97 | $36 |
| 2026-04-10 | 524 | $9.34 | $5K |
| 2026-04-07 | 52,932 | $9.52 | $504K |
Insider trades
SEC Form 4, newest first. JSONInsiders at MGTX reported 3 open-market sells worth $1.7M in the last 90 days and no open-market buys. Latest filing: Giroux Richard (CFO & COO) on 2026-10-20.
| Date | Insider | Title | Type | Shares | Price | Value | Owned after |
|---|---|---|---|---|---|---|---|
| 2026-10-20 | Giroux Richard | CFO & COO | Sell | 56K | $9.95 | $557K | 853K |
| 2026-10-06 | Naylor Stuart | CHIEF SCI OFCR, OPHTHALMOLOGY | Sell | 28K | $10.64 | $294K | 613K |
| 2026-08-18 | Forbes Alexandria | PRESIDENT & CEO | Sell | 62K | $13.86 | $859K | 1.3M |
| 2026-07-21 | Giroux Richard | CFO & COO | Sell | 56K | $12.51 | $701K | 909K |
| 2026-07-07 | Naylor Stuart | CHIEF SCI OFCR, OPHTHALMOLOGY | Sell | 25K | $14.90 | $374K | 641K |
| 2026-07-07 | Naylor Stuart | CHIEF SCI OFCR, OPHTHALMOLOGY | Sell | 3K | $13.86 | $35K | 666K |
| 2026-06-10 | Harris Keith R. | Director | Exercise or conversion | 75K | price not stated in the filing | not stated | 200K |
| 2026-05-27 | Giroux Richard | CFO & COO | Gift | 7K | $0.00 | $0 | 965K |
| 2026-05-19 | Forbes Alexandria | PRESIDENT & CEO | Sell | 62K | $9.17 | $569K | 1.4M |
| 2026-04-21 | Giroux Richard | CFO & COO | Sell | 56K | $10.22 | $572K | 972K |
| 2026-04-17 | PERCEPTIVE LIFE SCIENCES MASTER FUND LTD | Director,TenPercentOwner | Grant | 556K | $9.00 | $5.0M | 10.8M |
| 2026-04-17 | PERCEPTIVE ADVISORS LLC | Director, 10% owner | Grant | 556K | $9.00 | $5.0M | 10.8M |
| 2026-04-07 | Naylor Stuart | CHIEF DEV. OFFICER | Sell | 28K | $9.36 | $259K | 669K |
| 2026-03-24 | Forbes Alexandria | PRESIDENT & CEO | Sell | 62K | $7.41 | $459K | 1.4M |
| 2026-02-21 | Forbes Alexandria | PRESIDENT & CEO | Exercise or conversion | 63K | price not stated in the filing | not stated | 1.5M |
| 2026-02-21 | Forbes Alexandria | PRESIDENT & CEO | Tax withholding | 33K | $7.45 | $246K | 1.5M |
| 2026-02-21 | Giroux Richard | CFO & COO | Exercise or conversion | 60K | price not stated in the filing | not stated | 1.1M |
| 2026-02-21 | Giroux Richard | CFO & COO | Tax withholding | 32K | $7.45 | $236K | 1.0M |
| 2026-02-21 | Naylor Stuart | CHIEF DEV. OFFICER | Exercise or conversion | 25K | price not stated in the filing | not stated | 708K |
| 2026-02-21 | Naylor Stuart | CHIEF DEV. OFFICER | Tax withholding | 12K | $7.45 | $88K | 696K |
| 2026-02-21 | Wollin Robert J | GENERAL COUNSEL AND SECRETARY | Exercise or conversion | 11K | price not stated in the filing | not stated | 63K |
| 2026-02-21 | Wollin Robert J | GENERAL COUNSEL AND SECRETARY | Tax withholding | 6K | $7.45 | $44K | 57K |
| 2026-02-21 | Zeldin Robert K | CHIEF MEDICAL OFFICER | Tax withholding | 3K | $7.45 | $22K | 173K |
| 2026-02-21 | Zeldin Robert K | CHIEF MEDICAL OFFICER | Exercise or conversion | 8K | price not stated in the filing | not stated | 176K |
| 2026-01-17 | Forbes Alexandria | PRESIDENT & CEO | Tax withholding | 164K | $7.42 | $1.2M | 1.5M |
| 2026-01-17 | Forbes Alexandria | PRESIDENT & CEO | Exercise or conversion | 310K | price not stated in the filing | not stated | 1.6M |
| 2026-01-17 | Giroux Richard | CFO & COO | Tax withholding | 164K | $7.42 | $1.2M | 999K |
| 2026-01-17 | Giroux Richard | CFO & COO | Exercise or conversion | 310K | price not stated in the filing | not stated | 1.2M |
| 2026-01-17 | Naylor Stuart | CHIEF DEV. OFFICER | Tax withholding | 35K | $7.42 | $262K | 683K |
| 2026-01-17 | Naylor Stuart | CHIEF DEV. OFFICER | Exercise or conversion | 75K | price not stated in the filing | not stated | 718K |
| 2026-01-17 | Wollin Robert J | GENERAL COUNSEL AND SECRETARY | Tax withholding | 27K | $7.42 | $202K | 52K |
| 2026-01-17 | Wollin Robert J | GENERAL COUNSEL AND SECRETARY | Exercise or conversion | 50K | price not stated in the filing | not stated | 79K |
| 2026-01-17 | Zeldin Robert K | CHIEF MEDICAL OFFICER | Tax withholding | 14K | $7.42 | $104K | 168K |
| 2026-01-17 | Zeldin Robert K | CHIEF MEDICAL OFFICER | Exercise or conversion | 35K | price not stated in the filing | not stated | 182K |
| 2026-01-07 | Zeldin Robert K | CHIEF MEDICAL OFFICER | Tax withholding | 8K | $7.73 | $60K | 146K |
| 2026-01-07 | Forbes Alexandria | PRESIDENT & CEO | Tax withholding | 34K | $7.73 | $263K | 1.3M |
| 2026-01-07 | Forbes Alexandria | PRESIDENT & CEO | Exercise or conversion | 63K | price not stated in the filing | not stated | 1.4M |
| 2026-01-07 | Giroux Richard | CFO & COO | Exercise or conversion | 53K | price not stated in the filing | not stated | 882K |
| 2026-01-07 | Giroux Richard | CFO & COO | Tax withholding | 29K | $7.73 | $223K | 853K |
| 2026-01-07 | Naylor Stuart | CHIEF DEV. OFFICER | Exercise or conversion | 38K | price not stated in the filing | not stated | 661K |
| 2026-01-07 | Naylor Stuart | CHIEF DEV. OFFICER | Tax withholding | 18K | $7.73 | $136K | 643K |
| 2026-01-07 | Wollin Robert J | GENERAL COUNSEL AND SECRETARY | Exercise or conversion | 8K | price not stated in the filing | not stated | 34K |
| 2026-01-07 | Wollin Robert J | GENERAL COUNSEL AND SECRETARY | Tax withholding | 4K | $7.73 | $34K | 29K |
| 2026-01-07 | Zeldin Robert K | CHIEF MEDICAL OFFICER | Exercise or conversion | 18K | price not stated in the filing | not stated | 154K |
| 2026-01-07 | Zeldin Robert K | CHIEF MEDICAL OFFICER | Tax withholding | 7K | $7.73 | $52K | 147K |
| 2025-12-31 | PERCEPTIVE LIFE SCIENCES MASTER FUND LTD | Director,TenPercentOwner | Returned to company | 2.3M | $7.91 | $18.2M | 10.2M |
| 2025-12-31 | PERCEPTIVE ADVISORS LLC | Director, 10% owner | Returned to company | 2.3M | $7.91 | $18.2M | 10.2M |
| 2025-12-23 | Forbes Alexandria | PRESIDENT & CEO | Gift | 6K | $0.00 | $0 | 1.3M |
| 2025-11-20 | Wollin Robert J | GENERAL COUNSEL AND SECRETARY | Gift | 5K | $0.00 | $0 | 26K |
| 2025-10-21 | Giroux Richard | CFO & COO | Sell | 24K | $8.87 | $213K | 829K |
| 2025-10-07 | Forbes Alexandria | PRESIDENT & CEO | Sell | 48K | $8.39 | $399K | 1.3M |
| 2025-07-22 | Giroux Richard | CFO & COO | Sell | 24K | $8.52 | $204K | 853K |
| 2025-07-08 | Forbes Alexandria | PRESIDENT & CEO | Sell | 48K | $7.97 | $379K | 1.4M |
| 2025-06-30 | Giroux Richard | CFO & COO | Gift | 5K | $0.00 | $0 | 877K |
| 2025-06-06 | Harris Keith R. | Director | Exercise or conversion | 75K | price not stated in the filing | not stated | 125K |
| 2025-04-22 | Giroux Richard | CFO & COO | Sell | 24K | $6.00 | $144K | 882K |
| 2025-04-08 | Forbes Alexandria | PRESIDENT & CEO | Sell | 48K | $5.34 | $254K | 1.4M |
| 2025-02-21 | Forbes Alexandria | PRESIDENT & CEO | Tax withholding | 66K | $7.30 | $482K | 1.5M |
| 2025-02-21 | Forbes Alexandria | PRESIDENT & CEO | Exercise or conversion | 125K | price not stated in the filing | not stated | 1.5M |
| 2025-02-21 | Giroux Richard | CFO & COO | Exercise or conversion | 120K | price not stated in the filing | not stated | 970K |
| 2025-02-21 | Giroux Richard | CFO & COO | Tax withholding | 63K | $7.30 | $463K | 906K |
| 2025-02-21 | Naylor Stuart | CHIEF DEV. OFFICER | Exercise or conversion | 50K | price not stated in the filing | not stated | 647K |
| 2025-02-21 | Naylor Stuart | CHIEF DEV. OFFICER | Tax withholding | 24K | $7.30 | $172K | 623K |
| 2025-02-21 | Wollin Robert J | GENERAL COUNSEL AND SECRETARY | Tax withholding | 12K | $7.30 | $88K | 31K |
| 2025-02-21 | Wollin Robert J | GENERAL COUNSEL AND SECRETARY | Exercise or conversion | 23K | price not stated in the filing | not stated | 43K |
| 2025-02-21 | Zeldin Robert K | CHIEF MEDICAL OFFICER | Tax withholding | 6K | $7.30 | $43K | 137K |
| 2025-02-21 | Zeldin Robert K | CHIEF MEDICAL OFFICER | Exercise or conversion | 15K | price not stated in the filing | not stated | 142K |
| 2025-01-21 | Giroux Richard | CFO & COO | Sell | 24K | $6.29 | $151K | 850K |
| 2025-01-14 | Forbes Alexandria | PRESIDENT & CEO | Exercise or conversion | 30K | price not stated in the filing | not stated | 1.4M |
| 2025-01-14 | Forbes Alexandria | PRESIDENT & CEO | Tax withholding | 16K | $5.77 | $92K | 1.4M |
| 2025-01-14 | Giroux Richard | CFO & COO | Exercise or conversion | 25K | price not stated in the filing | not stated | 887K |
| 2025-01-14 | Giroux Richard | CFO & COO | Tax withholding | 13K | $5.77 | $76K | 874K |
| 2025-01-14 | Naylor Stuart | CHIEF DEV. OFFICER | Exercise or conversion | 24K | price not stated in the filing | not stated | 608K |
| 2025-01-14 | Naylor Stuart | CHIEF DEV. OFFICER | Tax withholding | 11K | $5.77 | $64K | 597K |
| 2025-01-14 | Wollin Robert J | GENERAL COUNSEL AND SECRETARY | Tax withholding | 3K | $5.77 | $17K | 21K |
| 2025-01-14 | Wollin Robert J | GENERAL COUNSEL AND SECRETARY | Exercise or conversion | 5K | price not stated in the filing | not stated | 24K |
| 2025-01-14 | Zeldin Robert K | CHIEF MEDICAL OFFICER | Exercise or conversion | 38K | price not stated in the filing | not stated | 143K |
| 2025-01-14 | Zeldin Robert K | CHIEF MEDICAL OFFICER | Tax withholding | 15K | $5.77 | $87K | 127K |
| 2025-01-08 | Forbes Alexandria | PRESIDENT & CEO | Sell | 12K | $6.30 | $73K | 1.4M |
| 2025-01-07 | Giroux Richard | CFO & COO | Exercise or conversion | 53K | price not stated in the filing | not stated | 890K |
| 2025-01-07 | Giroux Richard | CFO & COO | Tax withholding | 28K | $6.34 | $176K | 862K |
| 2025-01-07 | Naylor Stuart | CHIEF DEV. OFFICER | Exercise or conversion | 38K | price not stated in the filing | not stated | 602K |
| 2025-01-07 | Naylor Stuart | CHIEF DEV. OFFICER | Tax withholding | 18K | $6.34 | $112K | 584K |
| 2025-01-07 | Wollin Robert J | GENERAL COUNSEL AND SECRETARY | Exercise or conversion | 8K | price not stated in the filing | not stated | 23K |
| 2025-01-07 | Wollin Robert J | GENERAL COUNSEL AND SECRETARY | Tax withholding | 4K | $6.34 | $25K | 19K |
| 2025-01-07 | Forbes Alexandria | PRESIDENT & CEO | Tax withholding | 33K | $6.34 | $210K | 1.4M |
| 2025-01-07 | Forbes Alexandria | PRESIDENT & CEO | Exercise or conversion | 63K | price not stated in the filing | not stated | 1.5M |
| 2025-01-07 | Forbes Alexandria | PRESIDENT & CEO | Sell | 36K | $6.47 | $232K | 1.4M |
| 2025-01-07 | Zeldin Robert K | CHIEF MEDICAL OFFICER | Tax withholding | 7K | $6.34 | $44K | 105K |
| 2025-01-07 | Zeldin Robert K | CHIEF MEDICAL OFFICER | Exercise or conversion | 18K | price not stated in the filing | not stated | 112K |
| 2024-08-12 | EDELMAN JOSEPH | Director,TenPercentOwner | Buy | 1.3M | $4.00 | $5.0M | 12.5M |
| 2024-06-05 | Harris Keith R. | Director | Exercise or conversion | 30K | price not stated in the filing | not stated | 50K |
| 2024-06-05 | Indyk Martin | Director | Exercise or conversion | 20K | price not stated in the filing | not stated | 35K |
| 2024-05-28 | Giroux Richard | CFO & COO | Gift | 3K | $0.00 | $0 | 837K |
| 2024-04-05 | Forbes Alexandria | PRESIDENT & CEO | Gift | 1K | $0.00 | $0 | 1.4M |
| 2024-03-12 | Forbes Alexandria | PRESIDENT & CEO | Gift | 2K | $0.00 | $0 | 1.4M |
| 2024-02-29 | Giroux Richard | CFO & COO | Gift | 14K | $0.00 | $0 | 840K |
| 2024-01-14 | Wollin Robert J | GENERAL COUNSEL AND SECRETARY | Exercise or conversion | 5K | price not stated in the filing | not stated | 18K |
| 2024-01-14 | Wollin Robert J | GENERAL COUNSEL AND SECRETARY | Tax withholding | 3K | $6.36 | $17K | 15K |
| 2024-01-14 | Naylor Stuart | CHIEF DEV. OFFICER | Exercise or conversion | 24K | price not stated in the filing | not stated | 575K |
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.
Planned sales (Form 144)
Newest first. JSON11 Form 144 notices on file for MGTX worth $5.3M at the prices reported; 3 in the last 90 days worth $1.7M. Latest: Richard Giroux filed on 2026-10-20 to sell 56,000 shares ($557K) from 2026-10-20.
| Filed | Seller | Shares | Market value | Of outstanding | Sale from | Broker |
|---|---|---|---|---|---|---|
| 2026-10-20 | Richard GirouxOfficer | 56K | $557K | 0.058% | 2026-10-20 | Merrill Lynch |
| 2026-10-06 | Naylor StuartOfficer | 28K | $294K | 0.029% | 2026-10-06 | Fidelity Brokerage Services LLC |
| 2026-08-18 | Alexandria ForbesOfficer, Director | 62K | $859K | 0.065% | 2026-08-18 | Merrill Lynch |
| 2026-07-21 | Richard GirouxOfficer | 56K | $701K | 0.060% | 2026-07-21 | Merrill Lynch |
| 2026-07-07 | Naylor StuartOfficer | 28K | $369K | 0.030% | 2026-07-07 | Fidelity Brokerage Services LLC |
| 2026-05-19 | Alexandria ForbesOfficer, Director | 62K | $569K | 0.067% | 2026-05-19 | Merrill Lynch |
| 2026-04-21 | Richard GirouxOfficer | 56K | $573K | 0.061% | 2026-04-21 | Merrill Lynch |
| 2026-04-07 | Naylor StuartOfficer | 28K | $259K | 0.034% | 2026-04-07 | Fidelity Brokerage Services LLC |
| 2026-03-24 | Alexandria ForbesOfficer, Director | 62K | $459K | 0.077% | 2026-03-24 | Merrill Lynch |
| 2025-10-21 | Richard GirouxOfficer | 24K | $213K | 0.030% | 2025-10-21 | Merrill Lynch |
| 2025-10-07 | Alexandria ForbesOfficer, Director | 48K | $399K | 0.059% | 2025-10-07 | Merrill Lynch |
Large holders (13D and 13G)
One row per reporting person with its latest filing, newest first. JSON5 holders report 5% or more of MGTX in their latest filing, 3 on Schedule 13D (active intent). The largest reported stake is Perceptive Advisors LLC at 12.6% of the class (11,742,117 shares), filed 2026-04-24 for an event on 2026-04-17.
| Filed | Form | Holder | Shares | Of class | Event |
|---|---|---|---|---|---|
| 2026-08-14 | 13G/Ano. 1 | Rubric Capital Management LPinvestment adviser, partnership | 9.1M | 9.8% | 2026-06-30 |
| 2026-08-14 | 13G/Ano. 1 | David Rosenparent holding company, individual | 9.1M | 9.8% | 2026-06-30 |
| 2026-05-13 | 13G/Ano. 6 | Adage Capital Management, L.P.investment adviser, partnership | 4.0M | 4.9% | 2026-03-31 |
| 2026-05-13 | 13G/Ano. 6 | Robert Atchinsonparent holding company, individual | 4.0M | 4.9% | 2026-03-31 |
| 2026-05-13 | 13G/Ano. 6 | Phillip Grossparent holding company, individual | 4.0M | 4.9% | 2026-03-31 |
| 2026-04-24 | 13D/Ano. 8 | Perceptive Advisors LLCinvestment adviser | 11.7M | 12.6% | 2026-04-17 |
| 2026-04-24 | 13D/Ano. 8 | Joseph Edelmanindividual | 11.7M | 12.6% | 2026-04-17 |
| 2026-04-24 | 13D/Ano. 8 | Perceptive Life Sciences Master Fund, Ltd.corporation | 11.7M | 12.6% | 2026-04-17 |
| 2026-02-13 | 13G/Ano. 3 | Prosight Management, LPinvestment adviser | 3.2M | 4.0% | 2025-12-31 |
| 2026-02-13 | 13G/Ano. 3 | Prosight Partners, LLCother entity | 3.2M | 4.0% | 2025-12-31 |
| 2026-02-13 | 13G/Ano. 3 | W. Lawrence Hawkinsparent holding company, individual | 3.2M | 4.0% | 2025-12-31 |
| 2026-02-13 | 13G/Ano. 3 | Prosight Plus Fund, LPpartnership | 700K | 0.9% | 2025-12-31 |
| 2026-02-13 | 13G/Ano. 3 | Prosight Fund, LPpartnership | 152K | 0.2% | 2025-12-31 |
13F holders
Tracked managers holding MGTX at their latest 13F. JSON6 of the 30 tracked managers held MGTX at their latest 13F, $66.2M in total at quarter-end prices. Millennium Management is the largest at $40.1M (0.0% of its portfolio) as of 2026-06-30. Over the prior quarter 5 added shares and 1 cut.
| Fund | Quarter | Shares | Value | Of portfolio | Change in shares |
|---|---|---|---|---|---|
| Millennium Management | 2026-06-30 | 3.0M | $40.1M | 0.01% | -494K |
| D. E. Shaw & Co. | 2026-06-30 | 853K | $11.5M | 0.01% | +428K |
| Citadel Advisors | 2026-06-30 | 650K | $8.8M | 0.00% | +534K |
| Point72 Asset Management | 2026-06-30 | 202K | $2.7M | 0.00% | +131K |
| AQR Capital Management | 2026-06-30 | 197K | $2.7M | 0.00% | +86K |
| Two Sigma Investments | 2026-06-30 | 29K | $389K | 0.00% | new |
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
MeiraGTx Holdings 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 MeiraGTx Holdings (MGTX), SEC CIK 1735438, listed on Nasdaq, classified by the SEC as biological products, (no diagnostic substances). 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 2026-10-15.JSON and CSV
- Daily short volume
- FINRA Reg SHO daily filesSource: FINRA.Every trading day, the morning after FINRA posts it. Latest 2026-11-02.JSON and CSV
- Fails to deliver
- SEC fails-to-deliver dataSource: SEC.Twice a month, a few weeks after the half month ends. Latest 2026-10-13.JSON and CSV
- Planned sales
- SEC EDGAR Form 144Source: SEC.New notices appear shortly after the SEC posts them; a notice is filed on or before the sale. Latest 2026-10-20.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 2026-08-14.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 2026-08-13.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 2026-10-20.JSON and CSV
- Company record
- EDGAR filing index for CIK 1735438Ticker, 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.
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Datasets
Frequently Asked Questions
How much of MGTX is sold short?
6,438,544 shares were held short at the 2026-10-15 settlement, 6.5 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 MGTX's daily short volume?
On 2026-11-02, 103,442 of the 147,723 MGTX shares reported to FINRA were sold short, 70.0% of the day's reported volume. Short volume is a flow for one day, not a position.
Does MGTX have fails to deliver?
The SEC's latest file shows 30 MGTX shares failed to deliver at settlement 2026-10-13. Fails are reported per settlement date and published twice a month with a lag.
Are MGTX insiders buying or selling?
Insiders at MGTX reported 3 open-market sells worth $1.7M in the last 90 days and no open-market buys. Latest filing: Giroux Richard (CFO & COO) on 2026-10-20.
Have MGTX insiders filed to sell?
11 Form 144 notices on file for MGTX worth $5.3M at the prices reported; 3 in the last 90 days worth $1.7M. Latest: Richard Giroux filed on 2026-10-20 to sell 56,000 shares ($557K) from 2026-10-20.
Who owns 5% or more of MGTX?
5 holders report 5% or more of MGTX in their latest filing, 3 on Schedule 13D (active intent). The largest reported stake is Perceptive Advisors LLC at 12.6% of the class (11,742,117 shares), filed 2026-04-24 for an event on 2026-04-17.
Which tracked 13F managers own MGTX?
6 of the 30 tracked 13F managers held MGTX shares at their latest filing, $66.2M in all. The largest: Izzy Englander's Millennium Management (3.0M shares, $40.1M), D. E. Shaw & Co. (853K shares, $11.5M), Ken Griffin's Citadel Advisors (650K shares, $8.8M), Steve Cohen's Point72 Asset Management (202K shares, $2.7M), Cliff Asness's AQR Capital Management (197K shares, $2.7M), Two Sigma Investments (29K shares, $389K).
Data on this page is provided for informational purposes only and is not financial advice. See our editorial policy.