Quantum-Si (QSI)
Quantum-Si 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 measuring & controlling devices, nec.
11.8M
Short interest
settlement 2026-09-30
2.5
Days to cover
-7.9 days vs prior
60.6%
Short share of volume
2026-10-23
483
Fails to deliver
settlement 2026-09-25
Wed 4 Nov
Next earnings
estimated date
-$39K
Insider flow, 90 days
0 buys, 6 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 QSI is 11,830,534 shares, down 2,614,435 shares over the last month. Over the last 48 readings it ranged from 5,142,600 shares (15 November 2024) to 24,156,253 shares (30 May 2025). At the reported average volume of 4.8M shares a day that is 2.5 days to cover.
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| Settlement | Shares short | Change | Avg daily volume | Days to cover |
|---|---|---|---|---|
| 2026-09-30 | 11,830,534 | -9.3% | 4,804,383 | 2.46 |
| 2026-09-15 | 13,046,142 | -9.7% | 1,263,981 | 10.32 |
| 2026-08-31 | 14,444,969 | +1.2% | 3,019,753 | 4.78 |
| 2026-08-14 | 14,273,563 | -7.4% | 3,048,121 | 4.68 |
| 2026-07-31 | 15,417,732 | +9.1% | 2,606,673 | 5.91 |
| 2026-07-15 | 14,129,789 | -18.8% | 3,329,544 | 4.24 |
| 2026-06-30 | 17,398,927 | -22.7% | 6,407,399 | 2.72 |
| 2026-06-15 | 22,514,122 | -1.3% | 6,614,058 | 3.40 |
| 2026-05-29 | 22,808,138 | -1.9% | 7,014,205 | 3.25 |
| 2026-05-15 | 23,252,541 | +1.2% | 5,996,522 | 3.88 |
| 2026-04-30 | 22,967,445 | +0.1% | 6,755,299 | 3.40 |
| 2026-04-15 | 22,939,577 | +3.6% | 4,121,615 | 5.57 |
| 2026-03-31 | 22,143,189 | +2.9% | 3,069,696 | 7.21 |
| 2026-03-13 | 21,512,748 | +1.8% | 4,147,867 | 5.19 |
| 2026-02-27 | 21,136,226 | -1.0% | 2,630,855 | 8.03 |
| 2026-02-13 | 21,342,481 | +13.2% | 5,045,504 | 4.23 |
| 2026-01-30 | 18,855,768 | -2.4% | 4,822,424 | 3.91 |
| 2026-01-15 | 19,325,866 | +0.3% | 5,290,231 | 3.65 |
| 2025-12-31 | 19,264,903 | -0.3% | 5,308,295 | 3.63 |
| 2025-12-15 | 19,324,219 | +2.6% | 4,072,661 | 4.74 |
| 2025-11-28 | 18,837,920 | +19.3% | 4,731,442 | 3.98 |
| 2025-11-14 | 15,785,926 | -6.9% | 7,399,745 | 2.13 |
| 2025-10-31 | 16,953,953 | -15.0% | 15,741,120 | 1.08 |
| 2025-10-15 | 19,939,017 | -9.1% | 19,603,379 | 1.02 |
| 2025-09-30 | 21,940,146 | -0.2% | 15,521,390 | 1.41 |
| 2025-09-15 | 21,990,498 | -2.0% | 4,954,132 | 4.44 |
| 2025-08-29 | 22,446,391 | -4.3% | 6,042,884 | 3.71 |
| 2025-08-15 | 23,443,511 | +7.5% | 6,999,864 | 3.35 |
| 2025-07-31 | 21,814,094 | -7.0% | 7,468,681 | 2.92 |
| 2025-07-15 | 23,451,633 | -2.3% | 8,272,721 | 2.83 |
| 2025-06-30 | 23,998,879 | +0.7% | 9,133,871 | 2.63 |
| 2025-06-13 | 23,830,739 | -1.4% | 6,815,047 | 3.50 |
| 2025-05-30 | 24,156,253 | +2.8% | 16,627,675 | 1.45 |
| 2025-05-15 | 23,495,642 | +2.7% | 5,333,404 | 4.41 |
| 2025-04-30 | 22,869,044 | -0.2% | 2,487,380 | 9.19 |
| 2025-04-15 | 22,923,957 | +11.5% | 3,525,606 | 6.50 |
| 2025-03-31 | 20,566,034 | +23.6% | 10,507,810 | 1.96 |
| 2025-03-14 | 16,644,562 | -5.8% | 6,915,840 | 2.41 |
| 2025-02-28 | 17,664,266 | -6.0% | 7,717,977 | 2.29 |
| 2025-02-14 | 18,799,231 | +0.4% | 9,978,394 | 1.88 |
| 2025-01-31 | 18,727,420 | +0.8% | 15,809,566 | 1.18 |
| 2025-01-15 | 18,587,580 | -21.4% | 65,985,836 | 1.00 |
| 2024-12-31 | 23,648,533 | +109.8% | 54,382,939 | 1.00 |
| 2024-12-13 | 11,269,981 | +24.0% | 17,072,299 | 1.00 |
| 2024-11-29 | 9,091,351 | +76.8% | 42,833,159 | 1.00 |
| 2024-11-15 | 5,142,600 | -12.9% | 727,344 | 7.07 |
| 2024-10-31 | 5,901,407 | -0.1% | 565,959 | 10.43 |
| 2024-10-15 | 5,906,360 | -3.1% | 346,368 | 17.05 |
Daily short volume
FINRA Reg SHO, the last 30 sessions. JSONAs of 23 October 2026, the short share of QSI volume is 60.6%, up 14.2 points over the last five sessions. Over the last 30 readings it ranged from 28.1% (15 October 2026) to 71.3% (5 October 2026). The latest reading is 12.0 points above the 30-session average of 48.6%, on 7.2M shares reported.
| Date | Short volume | Total volume | Short share | Exempt |
|---|---|---|---|---|
| 2026-10-23 | 4.4M | 7.2M | 60.6% | 39,299 |
| 2026-10-22 | 591K | 1.7M | 34.0% | 0 |
| 2026-10-21 | 709K | 2.0M | 36.1% | 3,372 |
| 2026-10-20 | 1.5M | 3.6M | 41.4% | 720 |
| 2026-10-19 | 2.1M | 5.2M | 40.8% | 620,220 |
| 2026-10-16 | 2.2M | 4.8M | 46.4% | 388,595 |
| 2026-10-15 | 1.4M | 5.1M | 28.1% | 91,948 |
| 2026-10-14 | 1.1M | 2.9M | 37.1% | 1,917 |
| 2026-10-13 | 2.2M | 4.0M | 55.7% | 291,075 |
| 2026-10-12 | 2.5M | 5.9M | 42.7% | 401,055 |
| 2026-10-09 | 12.5M | 25.8M | 48.6% | 25,474 |
| 2026-10-08 | 1.1M | 2.8M | 39.1% | 222,103 |
| 2026-10-07 | 2.2M | 4.8M | 45.9% | 304,188 |
| 2026-10-06 | 2.6M | 5.1M | 50.7% | 342,616 |
| 2026-10-05 | 10.2M | 14.3M | 71.3% | 871,619 |
| 2026-10-02 | 4.1M | 11.1M | 37.0% | 572,261 |
| 2026-10-01 | 9.4M | 20.3M | 46.4% | 247,435 |
| 2026-09-30 | 4.6M | 8.8M | 51.7% | 45,054 |
| 2026-09-29 | 10.0M | 18.1M | 55.2% | 136,713 |
| 2026-09-28 | 588K | 1.0M | 58.0% | 14,103 |
| 2026-09-25 | 1.0M | 1.9M | 54.2% | 12,269 |
| 2026-09-24 | 408K | 930K | 43.8% | 0 |
| 2026-09-23 | 573K | 935K | 61.3% | 324 |
| 2026-09-22 | 833K | 1.6M | 50.9% | 9,000 |
| 2026-09-21 | 269K | 455K | 59.2% | 0 |
| 2026-09-18 | 292K | 705K | 41.4% | 0 |
| 2026-09-17 | 826K | 1.9M | 44.1% | 27,876 |
| 2026-09-16 | 257K | 493K | 52.2% | 300 |
| 2026-09-15 | 461K | 749K | 61.6% | 0 |
| 2026-09-14 | 584K | 932K | 62.7% | 0 |
Fails to deliver
SEC, the last 30 settlement dates with a fail. JSONAs of 25 September 2026, the fails-to-deliver balance in QSI is 483 shares, unchanged over the last settlement date. Over the last 30 readings it ranged from 8 shares (16 September 2026) to 1,027,267 shares (29 June 2026). The latest reading sits at the bottom of that range.
| Settlement | Shares failed | Price | Value |
|---|---|---|---|
| 2026-09-25 | 483 | $0.79 | $382 |
| 2026-09-24 | 483 | $0.76 | $367 |
| 2026-09-22 | 11,582 | $0.76 | $9K |
| 2026-09-18 | 44,917 | $0.77 | $35K |
| 2026-09-17 | 13,927 | $0.73 | $10K |
| 2026-09-16 | 8 | $0.72 | $6 |
| 2026-09-15 | 135 | $0.73 | $99 |
| 2026-09-08 | 4,999 | $0.77 | $4K |
| 2026-08-31 | 2,413 | $0.78 | $2K |
| 2026-08-28 | 3,548 | $0.80 | $3K |
| 2026-08-27 | 18,847 | $0.79 | $15K |
| 2026-08-25 | 3,846 | $0.77 | $3K |
| 2026-08-21 | 38,691 | $0.78 | $30K |
| 2026-08-13 | 4,031 | $0.84 | $3K |
| 2026-08-12 | 2,407 | $0.82 | $2K |
| 2026-08-10 | 8,005 | $0.81 | $6K |
| 2026-08-04 | 6,543 | $0.75 | $5K |
| 2026-07-22 | 26 | $0.84 | $22 |
| 2026-07-20 | 276 | $0.82 | $226 |
| 2026-07-17 | 3,903 | $0.82 | $3K |
| 2026-07-15 | 200 | $0.87 | $174 |
| 2026-07-14 | 14,328 | $0.87 | $12K |
| 2026-07-10 | 25 | $0.96 | $24 |
| 2026-07-07 | 15,685 | $0.95 | $15K |
| 2026-07-02 | 1,379 | $0.92 | $1K |
| 2026-07-01 | 535 | $0.89 | $476 |
| 2026-06-30 | 112,351 | $0.89 | $100K |
| 2026-06-29 | 1,027,267 | $0.85 | $873K |
| 2026-06-24 | 500 | $0.88 | $440 |
| 2026-06-23 | 3,100 | $0.92 | $3K |
Insider trades
SEC Form 4, newest first. JSONInsiders at QSI reported 6 open-market sells worth $39K in the last 90 days and no open-market buys. Latest filing: LaPointe Christian (GC & Corp. Secretary) on 2026-09-22.
| Date | Insider | Title | Type | Shares | Price | Value | Owned after |
|---|---|---|---|---|---|---|---|
| 2026-09-22 | LaPointe Christian | GC & Corp. Secretary | Sell | 5K | $0.76 | $4K | 1.2M |
| 2026-09-22 | Keyes Jeffry R. | Chief Financial Officer | Sell | 2K | $0.76 | $2K | 1.7M |
| 2026-09-22 | Hawkins Jeffrey Alan | President & CEO | Sell | 10K | $0.76 | $7K | 3.6M |
| 2026-09-21 | LaPointe Christian | GC & Corp. Secretary | Sell | 10K | $0.76 | $7K | 1.2M |
| 2026-09-21 | Keyes Jeffry R. | Chief Financial Officer | Sell | 5K | $0.76 | $4K | 1.7M |
| 2026-09-21 | Hawkins Jeffrey Alan | President & CEO | Sell | 20K | $0.76 | $15K | 3.6M |
| 2026-06-23 | Hawkins Jeffrey Alan | President & CEO | Sell | 11K | $0.90 | $10K | 3.7M |
| 2026-06-23 | Vieceli John S. | Chief Product Officer | Sell | 15K | $0.90 | $14K | 1.1M |
| 2026-06-23 | Keyes Jeffry R. | Chief Financial Officer | Sell | 4K | $0.90 | $4K | 1.7M |
| 2026-06-23 | LaPointe Christian | GC & Corp. Secretary | Sell | 8K | $0.90 | $7K | 1.2M |
| 2026-06-22 | Hawkins Jeffrey Alan | President & CEO | Sell | 11K | $0.96 | $11K | 3.7M |
| 2026-06-22 | Vieceli John S. | Chief Product Officer | Sell | 15K | $0.96 | $15K | 1.2M |
| 2026-06-22 | Keyes Jeffry R. | Chief Financial Officer | Sell | 4K | $0.96 | $4K | 1.7M |
| 2026-06-22 | LaPointe Christian | GC & Corp. Secretary | Sell | 8K | $0.96 | $7K | 1.2M |
| 2026-04-21 | Keyes Jeffry R. | Chief Financial Officer | Sell | 37K | $0.99 | $37K | 1.7M |
| 2026-04-21 | Hawkins Jeffrey Alan | President & CEO | Sell | 84K | $0.99 | $83K | 3.7M |
| 2026-04-20 | Keyes Jeffry R. | Chief Financial Officer | Sell | 37K | $1.01 | $38K | 1.8M |
| 2026-04-20 | Hawkins Jeffrey Alan | President & CEO | Sell | 84K | $1.01 | $84K | 3.8M |
| 2026-03-23 | Vieceli John S. | Chief Product Officer | Sell | 11K | $0.83 | $9K | 1.2M |
| 2026-03-23 | LaPointe Christian | GC & Corp. Secretary | Sell | 6K | $0.83 | $5K | 1.2M |
| 2026-03-23 | Keyes Jeffry R. | Chief Financial Officer | Sell | 4K | $0.83 | $4K | 1.8M |
| 2026-03-23 | Hawkins Jeffrey Alan | President & CEO | Sell | 12K | $0.83 | $10K | 3.9M |
| 2026-03-20 | Vieceli John S. | Chief Product Officer | Sell | 11K | $0.85 | $9K | 1.2M |
| 2026-03-20 | LaPointe Christian | GC & Corp. Secretary | Sell | 6K | $0.85 | $5K | 1.2M |
| 2026-03-20 | Keyes Jeffry R. | Chief Financial Officer | Sell | 4K | $0.85 | $4K | 1.8M |
| 2026-03-20 | Hawkins Jeffrey Alan | President & CEO | Sell | 12K | $0.85 | $10K | 3.9M |
| 2026-03-12 | Vieceli John S. | Chief Product Officer | Grant | 392K | $0.00 | $0 | 1.2M |
| 2026-03-12 | LaPointe Christian | GC & Corp. Secretary | Grant | 261K | $0.00 | $0 | 1.2M |
| 2026-03-12 | Keyes Jeffry R. | Chief Financial Officer | Grant | 653K | $0.00 | $0 | 1.8M |
| 2026-03-12 | Hawkins Jeffrey Alan | President & CEO | Grant | 1.3M | $0.00 | $0 | 3.9M |
| 2026-03-05 | Kummeth Charles R. | Director | Buy | 500K | $0.92 | $460K | 855K |
| 2026-03-05 | Dowdy Paula | Director | Buy | 110K | $0.95 | $104K | 269K |
| 2025-12-22 | Vieceli John S. | Chief Product Officer | Sell | 22K | $1.28 | $28K | 801K |
| 2025-12-22 | LaPointe Christian | GC & Corp. Secretary | Sell | 12K | $1.28 | $15K | 949K |
| 2025-12-22 | Keyes Jeffry R. | Chief Financial Officer | Sell | 9K | $1.28 | $11K | 1.2M |
| 2025-12-22 | Hawkins Jeffrey Alan | President & CEO | Sell | 24K | $1.28 | $30K | 2.6M |
| 2025-10-16 | ROTHBERG JONATHAN M | Director, 10% owner | Sell | 26K | $3.07 | $80K | 1.9M |
| 2025-09-23 | Vieceli John S. | Chief Product Officer | Sell | 10K | $1.64 | $16K | 823K |
| 2025-09-23 | LaPointe Christian | GC & Corp. Secretary | Sell | 5K | $1.64 | $9K | 961K |
| 2025-09-23 | Keyes Jeffry R. | Chief Financial Officer | Sell | 4K | $1.64 | $6K | 1.2M |
| 2025-09-23 | Hawkins Jeffrey Alan | President & CEO | Sell | 11K | $1.64 | $17K | 2.6M |
| 2025-09-23 | Bennett Todd C. | Chief Commercial Officer | Sell | 18K | $1.64 | $30K | 682K |
| 2025-09-22 | Vieceli John S. | Chief Product Officer | Sell | 10K | $1.68 | $17K | 833K |
| 2025-09-22 | LaPointe Christian | GC & Corp. Secretary | Sell | 5K | $1.68 | $9K | 966K |
| 2025-09-22 | Keyes Jeffry R. | Chief Financial Officer | Sell | 4K | $1.68 | $7K | 1.2M |
| 2025-09-22 | Hawkins Jeffrey Alan | President & CEO | Sell | 11K | $1.68 | $18K | 2.6M |
| 2025-09-22 | Bennett Todd C. | Chief Commercial Officer | Sell | 18K | $1.68 | $31K | 700K |
| 2025-06-23 | Vieceli John S. | Chief Product Officer | Sell | 22K | $1.61 | $35K | 843K |
| 2025-06-23 | LaPointe Christian | GC & Corp. Secretary | Sell | 12K | $1.61 | $19K | 972K |
| 2025-06-23 | Keyes Jeffry R. | Chief Financial Officer | Sell | 9K | $1.61 | $14K | 1.2M |
| 2025-06-23 | Hawkins Jeffrey Alan | President & CEO | Sell | 24K | $1.61 | $38K | 2.6M |
| 2025-03-21 | Vieceli John S. | Chief Product Officer | Sell | 4K | $1.39 | $6K | 865K |
| 2025-03-21 | Keyes Jeffry R. | Chief Financial Officer | Sell | 9K | $1.39 | $12K | 1.2M |
| 2025-03-21 | LaPointe Christian | General Counsel & Corp. Secr. | Sell | 5K | $1.39 | $7K | 983K |
| 2025-03-21 | Hawkins Jeffrey Alan | President & CEO | Sell | 24K | $1.39 | $33K | 2.6M |
| 2025-03-12 | Hawkins Jeffrey Alan | President & CEO | Grant | 1.7M | $0.00 | $0 | 2.7M |
| 2025-03-12 | Vieceli John S. | Chief Product Officer | Grant | 708K | $0.00 | $0 | 869K |
| 2025-03-12 | Bennett Todd C. | Chief Commercial Officer | Grant | 208K | $0.00 | $0 | 718K |
| 2025-03-12 | Keyes Jeffry R. | Chief Financial Officer | Grant | 750K | $0.00 | $0 | 1.2M |
| 2025-03-12 | LaPointe Christian | General Counsel & Corp. Secr. | Grant | 417K | $0.00 | $0 | 988K |
| 2024-12-27 | ROTHBERG JONATHAN M | Director, 10% owner | Sell | 42K | $4.10 | $173K | 1.3M |
| 2024-12-27 | ROTHBERG JONATHAN M | Director, 10% owner | Sell | 834K | $3.30 | $2.8M | 1.3M |
| 2024-12-27 | ROTHBERG JONATHAN M | Director, 10% owner | Sell | 42K | $4.10 | $173K | 1.3M |
| 2024-12-27 | ROTHBERG JONATHAN M | Director, 10% owner | Sell | 834K | $3.30 | $2.8M | 1.3M |
| 2024-12-27 | ROTHBERG JONATHAN M | Director, 10% owner | Sell | 42K | $4.10 | $173K | 1.3M |
| 2024-12-27 | ROTHBERG JONATHAN M | Director,TenPercentOwner | Sell | 834K | $3.30 | $2.8M | 1.3M |
| 2024-12-27 | ROTHBERG JONATHAN M | Director,TenPercentOwner | Sell | 42K | $4.10 | $173K | 1.3M |
| 2024-12-27 | ROTHBERG JONATHAN M | Director,TenPercentOwner | Sell | 834K | $3.30 | $2.8M | 1.3M |
| 2024-12-23 | Vieceli John S. | Chief Product Officer | Sell | 4K | $1.29 | $6K | 160K |
| 2024-09-24 | Vieceli John S. | Chief Product Officer | Sell | 2K | $0.93 | $2K | 165K |
| 2024-09-23 | Vieceli John S. | Chief Product Officer | Sell | 2K | $0.95 | $2K | 167K |
| 2024-09-17 | Bennett Todd C. | Chief Commercial Officer | Grant | 510K | $0.00 | $0 | 510K |
| 2024-08-12 | Kummeth Charles R. | Director | Buy | 31K | $0.89 | $28K | 355K |
| 2024-08-09 | Kummeth Charles R. | Director | Buy | 139K | $0.87 | $121K | 324K |
| 2024-08-09 | Keyes Jeffry R. | Chief Financial Officer | Buy | 50K | $0.87 | $44K | 447K |
| 2024-08-09 | LaPointe Christian | General Counsel & Corp. Secr. | Buy | 25K | $0.86 | $22K | 572K |
| 2024-08-09 | Hawkins Jeffrey Alan | President & CEO | Buy | 25K | $0.85 | $21K | 1.0M |
| 2024-06-24 | Johnston Grace | Chief Commercial Officer | Sell | 3K | $1.20 | $4K | 296K |
| 2024-06-21 | Johnston Grace | Chief Commercial Officer | Sell | 4K | $1.21 | $5K | 299K |
| 2024-03-22 | Dowdy Paula | Director | Grant | 159K | $0.00 | $0 | 159K |
| 2024-03-15 | LaPointe Christian | General Counsel & Corp. Secr. | Grant | 289K | $0.00 | $0 | 547K |
| 2024-03-15 | LaPointe Christian | General Counsel & Corp. Secr. | Buy | 10K | $1.74 | $17K | 258K |
| 2024-03-15 | Johnston Grace | Chief Commercial Officer | Grant | 303K | $0.00 | $0 | 303K |
| 2024-03-15 | Hawkins Jeffrey Alan | President & CEO | Grant | 954K | $0.00 | $0 | 979K |
| 2024-03-15 | Keyes Jeffry R. | Chief Financial Officer | Grant | 347K | $0.00 | $0 | 397K |
| 2024-03-14 | Hawkins Jeffrey Alan | President & CEO | Buy | 25K | $1.76 | $44K | 25K |
| 2024-03-05 | Keyes Jeffry R. | Chief Financial Officer | Buy | 50K | $1.61 | $81K | 50K |
| 2023-09-25 | Jafri Amir | Director | Grant | 116K | $0.00 | $0 | 116K |
| 2023-05-22 | Kenny John P. | Director | Grant | 114K | $0.00 | $0 | 114K |
| 2023-05-12 | Mendel Scott | Director | Grant | 142K | $0.00 | $0 | 142K |
| 2023-03-15 | LaPointe Christian | General Counsel & Corp. Secr. | Buy | 20K | $1.77 | $35K | 248K |
| 2022-12-20 | RAKIN KEVIN | Director | Other transaction | 601K | $0.00 | $0 | 1.2M |
| 2022-12-15 | RAKIN KEVIN | Director | Sell | 89K | $2.15 | $191K | 1.8M |
| 2022-08-17 | LaPointe Christian | General Counsel & Corp. Secr. | Buy | 20K | $3.93 | $79K | 228K |
| 2022-06-16 | Bajaj Vikram | Director | Grant | 67K | $0.00 | $0 | 67K |
| 2022-06-14 | ROTHBERG JONATHAN M | Interim CEO | Buy | 26K | $3.10 | $79K | 2.6M |
| 2022-06-13 | Dyer Matthew | Chief Business Officer | Sell | 2K | $3.22 | $5K | 333K |
| 2022-06-13 | MCKENNA MICHAEL P | EVP, Product Development & Ops | Sell | 2K | $3.22 | $5K | 869K |
| 2022-03-14 | MCKENNA MICHAEL P | Chief Operating Officer | Sell | 7K | $4.01 | $26K | 871K |
| 2022-03-14 | Dyer Matthew | Chief Business Officer | Sell | 6K | $4.01 | $26K | 335K |
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. JSON23 Form 144 notices on file for QSI worth $733K at the prices reported; 3 in the last 90 days worth $39K. Latest: Hawkins Jeffrey Alan filed on 2026-09-23 to sell 29,852 shares ($23K) from 2026-09-21.
| Filed | Seller | Shares | Market value | Of outstanding | Sale from | Broker |
|---|---|---|---|---|---|---|
| 2026-09-23 | Hawkins Jeffrey AlanOfficer, Director | 30K | $23K | 0.015% | 2026-09-21 | Morgan Stanley Smith Barney LLC |
| 2026-09-23 | Keyes Jeffry R.Officer | 8K | $6K | 0.004% | 2026-09-21 | Morgan Stanley Smith Barney LLC |
| 2026-09-23 | LaPointe ChristianOfficer | 15K | $11K | 0.007% | 2026-09-21 | Morgan Stanley Smith Barney LLC |
| 2026-06-24 | Vieceli John S.Officer | 30K | $28K | 0.015% | 2026-06-22 | Morgan Stanley Smith Barney LLC |
| 2026-06-24 | LaPointe ChristianOfficer | 16K | $14K | 0.008% | 2026-06-22 | Morgan Stanley Smith Barney LLC |
| 2026-06-24 | Keyes Jeffry R.Officer | 8K | $8K | 0.004% | 2026-06-22 | Morgan Stanley Smith Barney LLC |
| 2026-06-24 | Hawkins Jeffrey AlanOfficer, Director | 23K | $21K | 0.011% | 2026-06-22 | Morgan Stanley Smith Barney LLC |
| 2026-04-22 | Keyes Jeffry R.Officer | 75K | $75K | 0.038% | 2026-04-20 | Morgan Stanley Smith Barney LLC |
| 2026-04-22 | Hawkins Jeffrey AlanOfficer, Director | 167K | $168K | 0.085% | 2026-04-20 | Morgan Stanley Smith Barney LLC |
| 2026-03-24 | Vieceli John S.Officer | 22K | $18K | 0.011% | 2026-03-20 | Morgan Stanley Smith Barney LLC |
| 2026-03-24 | LaPointe ChristianOfficer | 12K | $10K | 0.006% | 2026-03-20 | Morgan Stanley Smith Barney LLC |
| 2026-03-24 | Keyes Jeffry R.Officer | 9K | $7K | 0.004% | 2026-03-20 | Morgan Stanley Smith Barney LLC |
| 2026-03-24 | Hawkins Jeffrey AlanOfficer, Director | 24K | $20K | 0.012% | 2026-03-20 | Morgan Stanley Smith Barney LLC |
| 2025-12-22 | Vieceli John S.Officer | 22K | $28K | 3.258% | 2025-12-22 | Morgan Stanley Smith Barney LLC |
| 2025-12-22 | LaPointe ChristianOfficer | 12K | $15K | 2.385% | 2025-12-22 | Morgan Stanley Smith Barney LLC |
| 2025-12-22 | Keyes Jeffry R.Officer | 9K | $11K | 0.913% | 2025-12-22 | Morgan Stanley Smith Barney LLC |
| 2025-12-22 | Hawkins Jeffrey AlanOfficer, Director | 24K | $30K | 1.076% | 2025-12-22 | Morgan Stanley Smith Barney LLC |
| 2025-10-20 | Vieceli John S.Officer | 20K | $33K | 2.703% | 2025-09-22 | Morgan Stanley Smith Barney LLC |
| 2025-10-20 | LaPointe ChristianOfficer | 11K | $18K | 1.968% | 2025-09-22 | Morgan Stanley Smith Barney LLC |
| 2025-10-20 | Keyes Jeffry R.Officer | 8K | $13K | 0.801% | 2025-09-22 | Morgan Stanley Smith Barney LLC |
| 2025-10-20 | Hawkins Jeffrey AlanOfficer, Director | 21K | $35K | 0.941% | 2025-09-22 | Morgan Stanley Smith Barney LLC |
| 2025-10-20 | Bennett Todd C.Officer | 37K | $61K | 6.396% | 2025-09-22 | Morgan Stanley Smith Barney LLC |
| 2025-10-16 | ROTHBERG JONATHAN MDirector | 26K | $80K | 0.018% | 2025-10-16 | Jefferies LLC |
Large holders (13D and 13G)
One row per reporting person with its latest filing, newest first. JSON3 holders report 5% or more of QSI in their latest filing, all on Schedule 13D (active intent). The largest reported stake is ROTHBERG JONATHAN M. at 100.0% of the class (19,937,500 shares), filed 2026-08-28 for an event on 2026-08-26.
| Filed | Form | Holder | Shares | Of class | Event |
|---|---|---|---|---|---|
| 2026-08-28 | 13D/Ano. 5 | ROTHBERG JONATHAN M.individual | 19.9M | 100.0% | 2026-08-26 |
| 2026-08-28 | 13D/Ano. 5 | 4C Holdings I, LLCother entity | 17.9M | 90.0% | 2026-08-26 |
| 2026-08-28 | 13D/Ano. 5 | 4C Holdings V, LLCother entity | 2.0M | 10.0% | 2026-08-26 |
| 2026-08-28 | 13D/Ano. 5 | 23rd Century Capital LLCother entity | 1.9M | 1.0% | 2026-08-26 |
| 2026-07-29 | 13G/Ano. 2 | BlackRock, Inc.parent holding company | 4.6M | 2.3% | 2026-06-30 |
| 2025-10-30 | 13G/Ano. 1 | The Vanguard Groupinvestment adviser | 8.7M | 4.8% | 2025-09-30 |
13F holders
Tracked managers holding QSI at their latest 13F. JSON6 of the 30 tracked managers held QSI at their latest 13F, $11.8M in total at quarter-end prices. ARK Investment Management is the largest at $6.3M (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 |
|---|---|---|---|---|---|
| ARK Investment Management | 2026-06-30 | 7.2M | $6.3M | 0.04% | +289K |
| Millennium Management | 2026-06-30 | 3.1M | $2.8M | 0.00% | new |
| AQR Capital Management | 2026-06-30 | 2.3M | $2.1M | 0.00% | -44K |
| Renaissance Technologies | 2026-06-30 | 554K | $490K | 0.00% | +436K |
| Citadel Advisors | 2026-06-30 | 44K | $39K | 0.00% | +29K |
| Point72 Asset Management | 2026-06-30 | 39K | $35K | 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
Quantum-Si 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 Quantum-Si (QSI), SEC CIK 1816431, listed on Nasdaq, classified by the SEC as measuring & controlling devices, nec. 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 2026-09-25.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 2026-09-23.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 2026-08-28.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 2026-09-22.JSON and CSV
- Company record
- EDGAR filing index for CIK 1816431Ticker, 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 measuring & controlling devices, nec
Other company pages
Datasets
Frequently Asked Questions
How much of QSI is sold short?
11,830,534 shares were held short at the 2026-09-30 settlement, 2.5 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 QSI's daily short volume?
On 2026-10-23, 4,363,972 of the 7,202,471 QSI shares reported to FINRA were sold short, 60.6% of the day's reported volume. Short volume is a flow for one day, not a position.
Does QSI have fails to deliver?
The SEC's latest file shows 483 QSI shares failed to deliver at settlement 2026-09-25. Fails are reported per settlement date and published twice a month with a lag.
Are QSI insiders buying or selling?
Insiders at QSI reported 6 open-market sells worth $39K in the last 90 days and no open-market buys. Latest filing: LaPointe Christian (GC & Corp. Secretary) on 2026-09-22.
Have QSI insiders filed to sell?
23 Form 144 notices on file for QSI worth $733K at the prices reported; 3 in the last 90 days worth $39K. Latest: Hawkins Jeffrey Alan filed on 2026-09-23 to sell 29,852 shares ($23K) from 2026-09-21.
Who owns 5% or more of QSI?
3 holders report 5% or more of QSI in their latest filing, all on Schedule 13D (active intent). The largest reported stake is ROTHBERG JONATHAN M. at 100.0% of the class (19,937,500 shares), filed 2026-08-28 for an event on 2026-08-26.
Which tracked 13F managers own QSI?
6 of the 30 tracked 13F managers held QSI shares at their latest filing, $11.8M in all. The largest: Cathie Wood's ARK Investment Management (7.2M shares, $6.3M), Izzy Englander's Millennium Management (3.1M shares, $2.8M), Cliff Asness's AQR Capital Management (2.3M shares, $2.1M), Renaissance Technologies (554K shares, $490K), Ken Griffin's Citadel Advisors (44K shares, $39K), Steve Cohen's Point72 Asset Management (39K shares, $35K).
Data on this page is provided for informational purposes only and is not financial advice. See our editorial policy.