American Superconductor (AMSC)
American Superconductor 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 motors & generators.
3.9M
Short interest
settlement 2026-09-30
5.4
Days to cover
-0.6 days vs prior
50.6%
Short share of volume
2026-10-23
339
Fails to deliver
settlement 2026-09-21
Wed 28 Oct
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 AMSC is 3,895,546 shares, up 239,330 shares over the last month. Over the last 48 readings it ranged from 2,263,149 shares (29 August 2025) to 3,929,693 shares (15 September 2026). The latest reading sits at the top of that range. At the reported average volume of 725K shares a day that is 5.4 days to cover.
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| Settlement | Shares short | Change | Avg daily volume | Days to cover |
|---|---|---|---|---|
| 2026-09-30 | 3,895,546 | -0.9% | 724,860 | 5.37 |
| 2026-09-15 | 3,929,693 | +7.5% | 657,603 | 5.98 |
| 2026-08-31 | 3,656,216 | +5.1% | 635,912 | 5.75 |
| 2026-08-14 | 3,478,380 | -1.5% | 718,620 | 4.84 |
| 2026-07-31 | 3,532,626 | +3.8% | 833,218 | 4.24 |
| 2026-07-15 | 3,403,538 | +1.2% | 671,679 | 5.07 |
| 2026-06-30 | 3,364,466 | -2.8% | 1,023,962 | 3.29 |
| 2026-06-15 | 3,460,676 | -11.2% | 1,445,314 | 2.39 |
| 2026-05-29 | 3,898,328 | +4.3% | 1,387,897 | 2.81 |
| 2026-05-15 | 3,738,766 | -1.0% | 1,189,725 | 3.14 |
| 2026-04-30 | 3,776,161 | +28.1% | 1,712,434 | 2.21 |
| 2026-04-15 | 2,946,702 | +5.0% | 875,377 | 3.37 |
| 2026-03-31 | 2,805,155 | +13.4% | 1,030,181 | 2.72 |
| 2026-03-13 | 2,474,546 | -17.9% | 862,906 | 2.87 |
| 2026-02-27 | 3,012,250 | +6.5% | 967,419 | 3.11 |
| 2026-02-13 | 2,829,720 | +16.1% | 1,976,686 | 1.43 |
| 2026-01-30 | 2,437,768 | -6.1% | 766,102 | 3.18 |
| 2026-01-15 | 2,597,170 | +8.0% | 813,165 | 3.19 |
| 2025-12-31 | 2,404,475 | +6.1% | 771,408 | 3.12 |
| 2025-12-15 | 2,265,739 | -11.0% | 773,252 | 2.93 |
| 2025-11-28 | 2,546,326 | -4.4% | 938,478 | 2.71 |
| 2025-11-14 | 2,662,835 | +1.3% | 1,737,011 | 1.53 |
| 2025-10-31 | 2,629,829 | -1.6% | 968,453 | 2.72 |
| 2025-10-15 | 2,672,210 | -4.4% | 1,230,781 | 2.17 |
| 2025-09-30 | 2,794,050 | +4.6% | 1,453,085 | 1.92 |
| 2025-09-15 | 2,672,116 | +18.1% | 923,473 | 2.89 |
| 2025-08-29 | 2,263,149 | -0.2% | 914,198 | 2.48 |
| 2025-08-15 | 2,268,207 | -4.2% | 1,236,664 | 1.83 |
| 2025-07-31 | 2,366,750 | -23.5% | 1,283,421 | 1.84 |
| 2025-07-15 | 3,094,083 | -8.7% | 1,004,651 | 3.08 |
| 2025-06-30 | 3,388,433 | +25.4% | 1,219,013 | 2.78 |
| 2025-06-13 | 2,701,909 | -3.6% | 1,810,688 | 1.49 |
| 2025-05-30 | 2,802,690 | -8.9% | 1,045,859 | 2.68 |
| 2025-05-15 | 3,077,837 | -2.8% | 455,402 | 6.76 |
| 2025-04-30 | 3,165,646 | +17.0% | 421,144 | 7.52 |
| 2025-04-15 | 2,705,082 | -3.2% | 660,799 | 4.09 |
| 2025-03-31 | 2,795,220 | -3.8% | 633,518 | 4.41 |
| 2025-03-14 | 2,906,118 | -8.2% | 1,000,620 | 2.90 |
| 2025-02-28 | 3,165,919 | +5.5% | 1,180,004 | 2.68 |
| 2025-02-14 | 3,002,201 | -14.2% | 1,815,293 | 1.65 |
| 2025-01-31 | 3,500,342 | -10.6% | 878,396 | 3.98 |
| 2025-01-15 | 3,913,354 | +2.8% | 977,162 | 4.00 |
| 2024-12-31 | 3,807,692 | +28.2% | 1,187,624 | 3.21 |
| 2024-12-13 | 2,970,993 | +12.6% | 1,590,449 | 1.87 |
| 2024-11-29 | 2,638,858 | -8.1% | 1,170,601 | 2.25 |
| 2024-11-15 | 2,870,545 | +4.7% | 2,136,791 | 1.34 |
| 2024-10-31 | 2,742,965 | +5.1% | 1,143,890 | 2.40 |
| 2024-10-15 | 2,609,309 | -10.3% | 1,021,583 | 2.55 |
Daily short volume
FINRA Reg SHO, the last 30 sessions. JSONAs of 23 October 2026, the short share of AMSC volume is 50.6%, down 8.4 points over the last five sessions. Over the last 30 readings it ranged from 36.3% (19 October 2026) to 72.0% (23 September 2026). The latest reading is 3.5 points below the 30-session average of 54.1%, on 172K shares reported.
| Date | Short volume | Total volume | Short share | Exempt |
|---|---|---|---|---|
| 2026-10-23 | 87K | 172K | 50.6% | 0 |
| 2026-10-22 | 112K | 276K | 40.6% | 0 |
| 2026-10-21 | 139K | 237K | 58.7% | 1,095 |
| 2026-10-20 | 133K | 284K | 46.8% | 0 |
| 2026-10-19 | 109K | 301K | 36.3% | 0 |
| 2026-10-16 | 155K | 262K | 59.0% | 0 |
| 2026-10-15 | 249K | 445K | 56.0% | 16,545 |
| 2026-10-14 | 199K | 482K | 41.3% | 21,654 |
| 2026-10-13 | 81K | 217K | 37.5% | 289 |
| 2026-10-12 | 138K | 226K | 61.0% | 182 |
| 2026-10-09 | 123K | 324K | 38.1% | 403 |
| 2026-10-08 | 335K | 493K | 68.0% | 0 |
| 2026-10-07 | 286K | 490K | 58.3% | 0 |
| 2026-10-06 | 214K | 332K | 64.4% | 0 |
| 2026-10-05 | 111K | 187K | 59.3% | 0 |
| 2026-10-02 | 108K | 226K | 48.0% | 0 |
| 2026-10-01 | 164K | 284K | 57.8% | 3,513 |
| 2026-09-30 | 153K | 248K | 61.5% | 0 |
| 2026-09-29 | 109K | 256K | 42.6% | 0 |
| 2026-09-28 | 121K | 180K | 67.2% | 311 |
| 2026-09-25 | 161K | 275K | 58.7% | 1 |
| 2026-09-24 | 166K | 338K | 49.0% | 118 |
| 2026-09-23 | 309K | 429K | 72.0% | 2,678 |
| 2026-09-22 | 172K | 316K | 54.3% | 1,091 |
| 2026-09-21 | 99K | 218K | 45.6% | 50 |
| 2026-09-18 | 173K | 247K | 70.2% | 2,575 |
| 2026-09-17 | 171K | 325K | 52.4% | 515 |
| 2026-09-16 | 148K | 229K | 64.6% | 0 |
| 2026-09-15 | 141K | 316K | 44.5% | 7,004 |
| 2026-09-14 | 220K | 371K | 59.2% | 0 |
Fails to deliver
SEC, the last 30 settlement dates with a fail. JSONAs of 21 September 2026, the fails-to-deliver balance in AMSC is 339 shares, down 68 shares over the last settlement date. Over the last 30 readings it ranged from 1 share (7 August 2026) to 13,369 shares (12 June 2026). The latest reading sits at the bottom of that range.
| Settlement | Shares failed | Price | Value |
|---|---|---|---|
| 2026-09-21 | 339 | $30.19 | $10K |
| 2026-09-10 | 407 | $29.31 | $12K |
| 2026-09-08 | 159 | $29.55 | $5K |
| 2026-08-24 | 719 | $30.01 | $22K |
| 2026-08-21 | 79 | $30.05 | $2K |
| 2026-08-20 | 45 | $31.16 | $1K |
| 2026-08-18 | 469 | $32.13 | $15K |
| 2026-08-14 | 286 | $31.51 | $9K |
| 2026-08-13 | 2,883 | $32.28 | $93K |
| 2026-08-12 | 2,948 | $32.13 | $95K |
| 2026-08-07 | 1 | $32.90 | $33 |
| 2026-08-05 | 283 | $33.45 | $9K |
| 2026-08-03 | 480 | $29.37 | $14K |
| 2026-07-28 | 79 | $30.53 | $2K |
| 2026-07-22 | 147 | $34.55 | $5K |
| 2026-07-17 | 20 | $33.09 | $662 |
| 2026-07-13 | 562 | $35.96 | $20K |
| 2026-07-07 | 255 | $38.13 | $10K |
| 2026-07-06 | 10 | $37.11 | $371 |
| 2026-07-02 | 145 | $39.92 | $6K |
| 2026-06-30 | 5,941 | $39.83 | $237K |
| 2026-06-29 | 873 | $39.73 | $35K |
| 2026-06-26 | 881 | $40.28 | $35K |
| 2026-06-23 | 706 | $45.33 | $32K |
| 2026-06-22 | 3,433 | $43.40 | $149K |
| 2026-06-18 | 1,591 | $40.13 | $64K |
| 2026-06-15 | 589 | $40.02 | $24K |
| 2026-06-12 | 13,369 | $39.51 | $528K |
| 2026-06-11 | 6,267 | $36.78 | $231K |
| 2026-06-10 | 295 | $40.53 | $12K |
Insider trades
SEC Form 4, newest first. JSONNo open-market insider trades were reported for AMSC in the last 90 days. The most recent filings are listed below. Latest filing: Littlefield Barbara G. (Director) on 2026-09-18.
| Date | Insider | Title | Type | Shares | Price | Value | Owned after |
|---|---|---|---|---|---|---|---|
| 2026-09-18 | Littlefield Barbara G. | Director | Grant | 2K | $0.00 | $0 | 37K |
| 2026-06-11 | Dambier Laura A. | Director | Sell | 4K | $37.63 | $151K | 15K |
| 2026-06-11 | Kosiba John W JR | SVP, CFO & Treasurer | Sell | 2K | $37.85 | $66K | 334K |
| 2026-06-11 | Kosiba John W JR | SVP, CFO & Treasurer | Sell | 5K | $37.33 | $188K | 336K |
| 2026-06-11 | McGahn Daniel P | Chairman, President and CEO | Sell | 5K | $37.85 | $174K | 1.1M |
| 2026-06-11 | McGahn Daniel P | Chairman, President and CEO | Sell | 12K | $37.28 | $429K | 1.1M |
| 2026-06-08 | Kosiba John W JR | SVP, CFO & Treasurer | Sell | 2K | $42.35 | $66K | 341K |
| 2026-06-08 | Kosiba John W JR | SVP, CFO & Treasurer | Sell | 3K | $41.50 | $136K | 343K |
| 2026-06-08 | McGahn Daniel P | Chairman, President and CEO | Sell | 5K | $42.19 | $197K | 1.1M |
| 2026-06-08 | McGahn Daniel P | Chairman, President and CEO | Sell | 5K | $41.39 | $207K | 1.2M |
| 2026-06-03 | Kosiba John W JR | SVP, CFO & Treasurer | Sell | 609 | $50.83 | $31K | 346K |
| 2026-06-03 | Kosiba John W JR | SVP, CFO & Treasurer | Sell | 3K | $49.28 | $130K | 347K |
| 2026-06-03 | Kosiba John W JR | SVP, CFO & Treasurer | Sell | 3K | $48.31 | $155K | 349K |
| 2026-06-03 | McGahn Daniel P | Chairman, President and CEO | Sell | 817 | $50.99 | $42K | 1.2M |
| 2026-06-03 | McGahn Daniel P | Chairman, President and CEO | Sell | 500 | $50.29 | $25K | 1.2M |
| 2026-06-03 | McGahn Daniel P | Chairman, President and CEO | Sell | 5K | $49.25 | $222K | 1.2M |
| 2026-06-03 | McGahn Daniel P | Chairman, President and CEO | Sell | 7K | $48.31 | $342K | 1.2M |
| 2026-06-02 | Kosiba John W JR | SVP, CFO & Treasurer | Sell | 600 | $52.19 | $31K | 352K |
| 2026-06-02 | Kosiba John W JR | SVP, CFO & Treasurer | Sell | 12K | $51.47 | $619K | 353K |
| 2026-06-02 | Kosiba John W JR | SVP, CFO & Treasurer | Sell | 12K | $50.62 | $614K | 365K |
| 2026-06-02 | Kosiba John W JR | SVP, CFO & Treasurer | Sell | 6K | $49.46 | $282K | 377K |
| 2026-06-02 | McGahn Daniel P | Chairman, President and CEO | Sell | 2K | $52.14 | $120K | 1.2M |
| 2026-06-02 | McGahn Daniel P | Chairman, President and CEO | Sell | 29K | $51.46 | $1.5M | 1.2M |
| 2026-06-02 | McGahn Daniel P | Chairman, President and CEO | Sell | 28K | $50.63 | $1.4M | 1.2M |
| 2026-06-02 | McGahn Daniel P | Chairman, President and CEO | Sell | 14K | $49.45 | $681K | 1.2M |
| 2026-06-01 | Kosiba John W JR | SVP, CFO & Treasurer | Grant | 30K | $0.00 | $0 | 383K |
| 2026-06-01 | McGahn Daniel P | Chairman, President and CEO | Grant | 60K | $0.00 | $0 | 1.2M |
| 2026-04-03 | Donnelly Terence Robert | Director | Grant | 3K | $0.00 | $0 | 3K |
| 2026-04-03 | OLIVER DAVID R JR | Director | Grant | 3K | $0.00 | $0 | 64K |
| 2026-04-03 | Littlefield Barbara G. | Director | Grant | 3K | $0.00 | $0 | 35K |
| 2026-04-03 | Klein Margaret D. | Director | Grant | 3K | $0.00 | $0 | 19K |
| 2026-04-03 | House Arthur H | Director | Grant | 3K | $0.00 | $0 | 52K |
| 2026-04-03 | Dambier Laura A. | Director | Grant | 3K | $0.00 | $0 | 19K |
| 2026-02-24 | OLIVER DAVID R JR | Director | Sell | 200 | $34.10 | $7K | 61K |
| 2025-08-08 | House Arthur H | Director | Sell | 10K | $50.92 | $494K | 49K |
| 2025-08-06 | House Arthur H | Director | Exercise or conversion | 10K | $6.80 | $66K | 58K |
| 2025-08-04 | McGahn Daniel P | Chairman, President and CEO | Sell | 28K | $55.11 | $1.5M | 1.2M |
| 2025-08-04 | McGahn Daniel P | Chairman, President and CEO | Sell | 73K | $54.26 | $4.0M | 1.2M |
| 2025-08-04 | Kosiba John W JR | SVP, CFO & Treasurer | Sell | 10K | $55.26 | $544K | 0 |
| 2025-08-04 | Kosiba John W JR | SVP, CFO & Treasurer | Sell | 16K | $55.13 | $868K | 353K |
| 2025-08-04 | Kosiba John W JR | SVP, CFO & Treasurer | Sell | 34K | $54.34 | $1.9M | 369K |
| 2025-06-11 | McGahn Daniel P | Chairman, President and CEO | Sell | 500 | $29.09 | $15K | 1.3M |
| 2025-06-11 | McGahn Daniel P | Chairman, President and CEO | Sell | 12K | $28.56 | $352K | 1.3M |
| 2025-06-11 | Kosiba John W JR | SVP, CFO & Treasurer | Sell | 300 | $29.08 | $9K | 403K |
| 2025-06-11 | Kosiba John W JR | SVP, CFO & Treasurer | Sell | 6K | $28.55 | $181K | 403K |
| 2025-06-06 | McGahn Daniel P | Chairman, President and CEO | Sell | 8K | $31.82 | $245K | 1.3M |
| 2025-06-06 | Kosiba John W JR | SVP, CFO & Treasurer | Sell | 5K | $31.83 | $151K | 410K |
| 2025-05-27 | Kosiba John W JR | SVP, CFO & Treasurer | Sell | 10K | $25.55 | $258K | 454K |
| 2025-05-27 | Kosiba John W JR | SVP, CFO & Treasurer | Sell | 40K | $26.61 | $1.1M | 414K |
| 2025-05-27 | McGahn Daniel P | Chairman, President and CEO | Sell | 98K | $26.60 | $2.6M | 1.3M |
| 2025-05-27 | McGahn Daniel P | Chairman, President and CEO | Sell | 25K | $25.55 | $626K | 1.4M |
| 2025-05-20 | McGahn Daniel P | Chairman, President and CEO | Sell | 13K | $24.49 | $314K | 1.4M |
| 2025-05-20 | Kosiba John W JR | SVP, CFO & Treasurer | Sell | 12K | $24.50 | $291K | 464K |
| 2025-05-15 | McGahn Daniel P | Chairman, President and CEO | Grant | 240K | $0.00 | $0 | 1.4M |
| 2025-05-15 | Kosiba John W JR | SVP, CFO & Treasurer | Grant | 120K | $0.00 | $0 | 476K |
| 2025-04-03 | Dambier Laura A. | Director | Grant | 3K | $0.00 | $0 | 16K |
| 2025-04-03 | House Arthur H | Director | Grant | 3K | $0.00 | $0 | 49K |
| 2025-04-03 | Klein Margaret D. | Director | Grant | 3K | $0.00 | $0 | 16K |
| 2025-04-03 | Littlefield Barbara G. | Director | Grant | 3K | $0.00 | $0 | 32K |
| 2025-04-03 | OLIVER DAVID R JR | Director | Grant | 3K | $0.00 | $0 | 61K |
| 2024-11-04 | Kosiba John W JR | SVP, CFO & Treasurer | Sell | 50K | $28.28 | $1.4M | 356K |
| 2024-09-30 | McGahn Daniel P | Chairman, President and CEO | Grant | 180K | $0.00 | $0 | 1.2M |
| 2024-09-26 | Kosiba John W JR | SVP, CFO & Treasurer | Grant | 90K | $0.00 | $0 | 406K |
| 2024-06-11 | Kosiba John W JR | SVP, CFO & Treasurer | Sell | 32K | $21.68 | $694K | 316K |
| 2024-06-11 | McGahn Daniel P | Chairman, President and CEO | Sell | 37K | $21.69 | $806K | 1.0M |
| 2024-05-21 | McGahn Daniel P | Chairman, President and CEO | Sell | 2K | $15.30 | $25K | 1.1M |
| 2024-05-21 | McGahn Daniel P | Chairman, President and CEO | Sell | 19K | $14.78 | $280K | 1.1M |
| 2024-05-21 | Kosiba John W JR | SVP, CFO & Treasurer | Sell | 27K | $14.78 | $397K | 350K |
| 2024-05-21 | Kosiba John W JR | SVP, CFO & Treasurer | Sell | 2K | $15.30 | $33K | 348K |
| 2024-04-03 | OLIVER DAVID R JR | Director | Grant | 4K | $0.00 | $0 | 58K |
| 2024-04-03 | Littlefield Barbara G. | Director | Grant | 4K | $0.00 | $0 | 30K |
| 2024-04-03 | Klein Margaret D. | Director | Grant | 4K | $0.00 | $0 | 13K |
| 2024-04-03 | House Arthur H | Director | Grant | 4K | $0.00 | $0 | 46K |
| 2024-04-03 | Dambier Laura A. | Director | Grant | 4K | $0.00 | $0 | 13K |
| 2023-06-22 | Kosiba John W JR | SVP, CFO & Treasurer | Sell | 30K | $5.95 | $178K | 377K |
| 2023-06-22 | McGahn Daniel P | Chairman, President and CEO | Sell | 37K | $5.95 | $220K | 1.1M |
| 2023-06-21 | Kosiba John W JR | SVP, CFO & Treasurer | Sell | 50K | $6.15 | $308K | 407K |
| 2023-06-21 | McGahn Daniel P | Chairman, President and CEO | Sell | 74K | $6.14 | $453K | 1.1M |
| 2023-06-15 | McGahn Daniel P | Chairman, President and CEO | Returned to company | 5K | $0.00 | $0 | 1.2M |
| 2023-06-15 | McGahn Daniel P | Chairman, President and CEO | Grant | 250K | $0.00 | $0 | 1.2M |
| 2023-06-15 | Kosiba John W JR | SVP, CFO & Treasurer | Returned to company | 2K | $0.00 | $0 | 457K |
| 2023-06-15 | Kosiba John W JR | SVP, CFO & Treasurer | Grant | 105K | $0.00 | $0 | 459K |
| 2023-04-05 | OLIVER DAVID R JR | Director | Grant | 12K | $0.00 | $0 | 54K |
| 2023-04-05 | Littlefield Barbara G. | Director | Grant | 12K | $0.00 | $0 | 26K |
| 2023-04-05 | Dambier Laura A. | Director | Grant | 9K | $0.00 | $0 | 9K |
| 2023-04-05 | Klein Margaret D. | Director | Grant | 9K | $0.00 | $0 | 9K |
| 2023-04-05 | House Arthur H | Director | Grant | 12K | $0.00 | $0 | 42K |
| 2022-12-16 | Kosiba John W JR | SVP, CFO & Treasurer | Buy | 15K | $3.50 | $53K | 354K |
| 2022-12-16 | McGahn Daniel P | Chairman, President and CEO | Buy | 25K | $3.49 | $87K | 943K |
| 2022-12-12 | Kosiba John W JR | SVP, CFO & Treasurer | Buy | 25K | $3.34 | $84K | 339K |
| 2022-10-31 | McGahn Daniel P | Chairman, President and CEO | Grant | 250K | $0.00 | $0 | 918K |
| 2022-10-19 | Kosiba John W JR | SVP, CFO & Treasurer | Grant | 125K | $0.00 | $0 | 314K |
| 2022-08-04 | Klein Margaret D. | Director | Buy | 500 | $5.57 | $3K | 16K |
| 2022-06-10 | BUDHRAJA VIKRAM S | Director | Grant | 2K | $0.00 | $0 | 59K |
| 2022-06-10 | Kosiba John W JR | SVP, CFO & Treasurer | Sell | 8K | $5.97 | $51K | 189K |
| 2022-06-10 | McGahn Daniel P | Chairman, President and CEO | Sell | 33K | $5.98 | $195K | 668K |
| 2022-05-31 | Kosiba John W JR | SVP, CFO & Treasurer | Sell | 13K | $5.45 | $73K | 197K |
| 2022-05-31 | McGahn Daniel P | Chairman, President and CEO | Sell | 22K | $5.45 | $118K | 701K |
| 2022-04-05 | BUDHRAJA VIKRAM S | Director | Grant | 6K | $0.00 | $0 | 58K |
| 2022-04-05 | Littlefield Barbara G. | Director | Grant | 6K | $0.00 | $0 | 14K |
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. JSON9 Form 144 notices on file for AMSC worth $7.8M at the prices reported; 0 in the last 90 days worth $0. Latest: JOHN KOSIBA filed on 2026-06-11 to sell 6,769 shares ($254K) from 2026-06-11.
| Filed | Seller | Shares | Market value | Of outstanding | Sale from | Broker |
|---|---|---|---|---|---|---|
| 2026-06-11 | JOHN KOSIBAOfficer | 7K | $254K | 0.014% | 2026-06-11 | Morgan Stanley Smith Barney LLC Executive Financial Services |
| 2026-06-11 | DANIEL MCGAHNOfficer, Director | 16K | $604K | 0.034% | 2026-06-11 | Morgan Stanley Smith Barney LLC Executive Financial Services |
| 2026-06-10 | Dambier Laura A.Director | 4K | $161K | 0.008% | 2026-06-10 | Charles Schwab Corporation |
| 2026-06-08 | JOHN KOSIBAOfficer | 5K | $202K | 0.010% | 2026-06-08 | Morgan Stanley Smith Barney LLC Executive Financial Services |
| 2026-06-08 | DANIEL MCGAHNOfficer, Director | 10K | $404K | 0.020% | 2026-06-08 | Morgan Stanley Smith Barney LLC Executive Financial Services |
| 2026-06-03 | DANIEL MCGAHNOfficer, Director | 13K | $630K | 0.027% | 2026-06-03 | Morgan Stanley Smith Barney LLC Executive Financial Services |
| 2026-06-03 | JOHN KOSIBAOfficer | 6K | $316K | 0.014% | 2026-06-03 | Morgan Stanley Smith Barney LLC Executive Financial Services |
| 2026-06-02 | JOHN KOSIBAOfficer | 30K | $1.5M | 0.064% | 2026-06-02 | Morgan Stanley Smith Barney LLC Executive Financial Services |
| 2026-06-02 | DANIEL MCGAHNOfficer, Director | 73K | $3.7M | 0.152% | 2026-06-02 | Morgan Stanley Smith Barney LLC Executive Financial Services |
Large holders (13D and 13G)
One row per reporting person with its latest filing, newest first. JSONNo holder on file reports 5% or more of AMSC in its latest filing.
| Filed | Form | Holder | Shares | Of class | Event |
|---|---|---|---|---|---|
| 2026-07-31 | 13G/Ano. 1 | Vanguard Capital Managementinvestment adviser | 2.4M | 4.9% | 2026-06-30 |
| 2026-03-26 | 13G/Ano. 3 | The Vanguard Groupinvestment adviser | 0 | 0.0% | 2026-03-13 |
13F holders
Tracked managers holding AMSC at their latest 13F. JSON5 of the 30 tracked managers held AMSC at their latest 13F, $32.1M in total at quarter-end prices. D. E. Shaw & Co. is the largest at $15.2M (0.0% of its portfolio) as of 2026-06-30. Over the prior quarter 1 added shares and 4 cut.
| Fund | Quarter | Shares | Value | Of portfolio | Change in shares |
|---|---|---|---|---|---|
| D. E. Shaw & Co. | 2026-06-30 | 367K | $15.2M | 0.01% | -201K |
| AQR Capital Management | 2026-06-30 | 194K | $8.1M | 0.00% | +10K |
| Millennium Management | 2026-06-30 | 101K | $4.2M | 0.00% | -814 |
| Two Sigma Investments | 2026-06-30 | 90K | $3.8M | 0.00% | -79K |
| Citadel Advisors | 2026-06-30 | 21K | $852K | 0.00% | -196K |
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
American Superconductor 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 American Superconductor (AMSC), SEC CIK 880807, listed on Nasdaq, classified by the SEC as motors & generators. 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 2026-09-21.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 2026-06-11.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 2026-07-31.JSON and CSV
- 13F holders
- SEC EDGAR Form 13F-HRSource: SEC.Quarterly, filed within 45 days of quarter end; 30 tracked managers. Latest 2026-06-30.JSON and CSV
- 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 2026-08-05.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 2026-09-18.JSON and CSV
- Company record
- EDGAR filing index for CIK 880807Ticker, 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 AMSC is sold short?
3,895,546 shares were held short at the 2026-09-30 settlement, 5.4 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 AMSC's daily short volume?
On 2026-10-23, 86,967 of the 171,689 AMSC shares reported to FINRA were sold short, 50.6% of the day's reported volume. Short volume is a flow for one day, not a position.
Does AMSC have fails to deliver?
The SEC's latest file shows 339 AMSC shares failed to deliver at settlement 2026-09-21. Fails are reported per settlement date and published twice a month with a lag.
Are AMSC insiders buying or selling?
No open-market insider trades were reported for AMSC in the last 90 days. The most recent filings are listed below. Latest filing: Littlefield Barbara G. (Director) on 2026-09-18.
Have AMSC insiders filed to sell?
9 Form 144 notices on file for AMSC worth $7.8M at the prices reported; 0 in the last 90 days worth $0. Latest: JOHN KOSIBA filed on 2026-06-11 to sell 6,769 shares ($254K) from 2026-06-11.
Who owns 5% or more of AMSC?
No holder on file reports 5% or more of AMSC in its latest filing.
Which tracked 13F managers own AMSC?
5 of the 30 tracked 13F managers held AMSC shares at their latest filing, $32.1M in all. The largest: D. E. Shaw & Co. (367K shares, $15.2M), Cliff Asness's AQR Capital Management (194K shares, $8.1M), Izzy Englander's Millennium Management (101K shares, $4.2M), Two Sigma Investments (90K shares, $3.8M), Ken Griffin's Citadel Advisors (21K shares, $852K).
Data on this page is provided for informational purposes only and is not financial advice. See our editorial policy.