Inspire Medical Systems (INSP)
Inspire Medical Systems on one page: short interest, daily short volume, fails to deliver, planned sales, large holders, 13F holders, financials, earnings dates and insider trades. Listed on NYSE, classified by the SEC as surgical & medical instruments & apparatus.
4.5M
Short interest
settlement 2026-10-15
4.5
Days to cover
-0.1 days vs prior
29.8%
Short share of volume
2026-11-02
268,784
Fails to deliver
settlement 2026-10-14
Wed 10 Feb
Next earnings
estimated date
-$57K
Insider flow, 90 days
0 buys, 1 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 INSP is 4,492,372 shares, up 564,122 shares over the last month. Over the last 48 readings it ranged from 1,954,237 shares (31 October 2024) to 4,694,748 shares (30 June 2026). The latest reading sits at the top of that range. At the reported average volume of 1.0M shares a day that is 4.5 days to cover.
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| Settlement | Shares short | Change | Avg daily volume | Days to cover |
|---|---|---|---|---|
| 2026-10-15 | 4,492,372 | +7.1% | 1,000,797 | 4.49 |
| 2026-09-30 | 4,195,817 | +6.8% | 906,711 | 4.63 |
| 2026-09-15 | 3,928,250 | +7.4% | 795,398 | 4.94 |
| 2026-08-31 | 3,656,612 | -16.4% | 488,000 | 7.49 |
| 2026-08-14 | 4,373,708 | +11.6% | 841,529 | 5.20 |
| 2026-07-31 | 3,920,330 | -9.8% | 781,458 | 5.02 |
| 2026-07-15 | 4,344,629 | -7.5% | 1,044,030 | 4.16 |
| 2026-06-30 | 4,694,748 | +30.8% | 1,234,943 | 3.80 |
| 2026-06-15 | 3,589,616 | -2.9% | 951,982 | 3.77 |
| 2026-05-29 | 3,695,854 | +0.4% | 1,187,303 | 3.11 |
| 2026-05-15 | 3,681,515 | +15.5% | 1,750,524 | 2.10 |
| 2026-04-30 | 3,187,512 | +10.4% | 789,041 | 4.04 |
| 2026-04-15 | 2,888,404 | -9.8% | 1,112,214 | 2.60 |
| 2026-03-31 | 3,201,461 | -10.3% | 969,271 | 3.30 |
| 2026-03-13 | 3,568,904 | -5.0% | 934,529 | 3.82 |
| 2026-02-27 | 3,755,963 | -4.7% | 1,495,768 | 2.51 |
| 2026-02-13 | 3,942,973 | +1.9% | 1,670,583 | 2.36 |
| 2026-01-30 | 3,868,836 | +31.1% | 1,491,778 | 2.59 |
| 2026-01-15 | 2,950,708 | +1.5% | 1,048,276 | 2.81 |
| 2025-12-31 | 2,907,519 | -16.1% | 1,984,284 | 1.47 |
| 2025-12-15 | 3,465,930 | -0.5% | 1,857,761 | 1.87 |
| 2025-11-28 | 3,481,719 | -5.2% | 1,923,965 | 1.81 |
| 2025-11-14 | 3,671,015 | +11.1% | 1,502,849 | 2.44 |
| 2025-10-31 | 3,305,009 | +16.8% | 990,699 | 3.34 |
| 2025-10-15 | 2,830,111 | +6.8% | 988,486 | 2.86 |
| 2025-09-30 | 2,650,182 | +1.3% | 1,025,438 | 2.58 |
| 2025-09-15 | 2,617,345 | +11.5% | 1,174,689 | 2.23 |
| 2025-08-29 | 2,347,878 | +2.5% | 878,762 | 2.67 |
| 2025-08-15 | 2,291,236 | -8.8% | 2,408,365 | 1.00 |
| 2025-07-31 | 2,511,665 | -23.7% | 520,095 | 4.83 |
| 2025-07-15 | 3,290,632 | +0.2% | 645,858 | 5.09 |
| 2025-06-30 | 3,285,458 | -3.3% | 546,530 | 6.01 |
| 2025-06-13 | 3,398,569 | +6.1% | 607,586 | 5.59 |
| 2025-05-30 | 3,203,372 | +0.1% | 468,103 | 6.84 |
| 2025-05-15 | 3,201,586 | +11.7% | 622,832 | 5.14 |
| 2025-04-30 | 2,866,393 | +8.0% | 371,000 | 7.73 |
| 2025-04-15 | 2,654,093 | -9.2% | 535,962 | 4.95 |
| 2025-03-31 | 2,922,464 | +0.8% | 374,968 | 7.79 |
| 2025-03-14 | 2,898,210 | -7.6% | 502,647 | 5.77 |
| 2025-02-28 | 3,137,819 | +8.1% | 542,441 | 5.78 |
| 2025-02-14 | 2,901,517 | +15.1% | 657,499 | 4.41 |
| 2025-01-31 | 2,520,469 | +10.3% | 446,950 | 5.64 |
| 2025-01-15 | 2,284,016 | -3.6% | 812,305 | 2.81 |
| 2024-12-31 | 2,369,172 | +2.1% | 498,924 | 4.75 |
| 2024-12-13 | 2,319,952 | +16.2% | 368,669 | 6.29 |
| 2024-11-29 | 1,995,770 | -11.0% | 447,651 | 4.46 |
| 2024-11-15 | 2,243,001 | +14.8% | 758,610 | 2.96 |
| 2024-10-31 | 1,954,237 | +2.2% | 358,603 | 5.45 |
Daily short volume
FINRA Reg SHO, the last 30 sessions. JSONAs of 2 November 2026, the short share of INSP volume is 29.8%, down 28.0 points over the last five sessions. Over the last 30 readings it ranged from 28.6% (22 October 2026) to 76.7% (29 September 2026). The latest reading sits at the bottom of that range. The latest reading is 27.3 points below the 30-session average of 57.2%, on 395K shares reported.
| Date | Short volume | Total volume | Short share | Exempt |
|---|---|---|---|---|
| 2026-11-02 | 118K | 395K | 29.8% | 0 |
| 2026-10-30 | 172K | 383K | 44.8% | 296 |
| 2026-10-29 | 70K | 151K | 46.2% | 6 |
| 2026-10-28 | 71K | 115K | 62.0% | 0 |
| 2026-10-27 | 124K | 236K | 52.7% | 3 |
| 2026-10-26 | 82K | 142K | 57.9% | 1 |
| 2026-10-23 | 84K | 186K | 45.0% | 183 |
| 2026-10-22 | 51K | 178K | 28.6% | 0 |
| 2026-10-21 | 63K | 94K | 67.3% | 0 |
| 2026-10-20 | 67K | 134K | 50.0% | 0 |
| 2026-10-19 | 65K | 120K | 54.0% | 0 |
| 2026-10-16 | 87K | 127K | 68.4% | 0 |
| 2026-10-15 | 130K | 175K | 74.1% | 5 |
| 2026-10-14 | 172K | 229K | 75.1% | 224 |
| 2026-10-13 | 182K | 273K | 66.7% | 19,519 |
| 2026-10-12 | 157K | 303K | 51.9% | 0 |
| 2026-10-09 | 99K | 222K | 44.6% | 0 |
| 2026-10-08 | 163K | 237K | 68.7% | 167 |
| 2026-10-07 | 186K | 265K | 70.1% | 0 |
| 2026-10-06 | 134K | 211K | 63.5% | 0 |
| 2026-10-05 | 136K | 212K | 64.2% | 0 |
| 2026-10-02 | 190K | 266K | 71.4% | 30 |
| 2026-10-01 | 456K | 847K | 53.8% | 0 |
| 2026-09-30 | 219K | 395K | 55.5% | 0 |
| 2026-09-29 | 241K | 314K | 76.7% | 0 |
| 2026-09-28 | 119K | 157K | 75.8% | 0 |
| 2026-09-25 | 103K | 269K | 38.3% | 0 |
| 2026-09-24 | 85K | 151K | 56.3% | 0 |
| 2026-09-23 | 119K | 223K | 53.2% | 0 |
| 2026-09-22 | 193K | 400K | 48.3% | 32 |
Fails to deliver
SEC, the last 30 settlement dates with a fail. JSONAs of 14 October 2026, the fails-to-deliver balance in INSP is 268,784 shares, unchanged over the last settlement date. Over the last 30 readings it ranged from 4 shares (10 July 2026) to 268,784 shares (13 October 2026). The latest reading sits at the top of that range.
| Settlement | Shares failed | Price | Value |
|---|---|---|---|
| 2026-10-14 | 268,784 | $68.86 | $18.5M |
| 2026-10-13 | 268,784 | $71.49 | $19.2M |
| 2026-09-22 | 4,648 | $75.72 | $352K |
| 2026-09-21 | 804 | $76.78 | $62K |
| 2026-09-16 | 143 | $74.60 | $11K |
| 2026-09-15 | 17 | $74.32 | $1K |
| 2026-08-24 | 13,400 | $62.36 | $836K |
| 2026-08-20 | 80 | $61.69 | $5K |
| 2026-08-10 | 227 | $60.16 | $14K |
| 2026-08-04 | 7,777 | $52.22 | $406K |
| 2026-07-30 | 152 | $51.07 | $8K |
| 2026-07-28 | 201 | $50.93 | $10K |
| 2026-07-20 | 700 | $50.60 | $35K |
| 2026-07-16 | 78 | $50.50 | $4K |
| 2026-07-15 | 22 | $49.15 | $1K |
| 2026-07-14 | 4,000 | $51.36 | $205K |
| 2026-07-13 | 4,000 | $51.76 | $207K |
| 2026-07-10 | 4 | $51.52 | $206 |
| 2026-07-02 | 3,008 | $45.46 | $137K |
| 2026-07-01 | 122 | $44.61 | $5K |
| 2026-06-29 | 8,933 | $45.72 | $408K |
| 2026-06-26 | 38 | $43.45 | $2K |
| 2026-06-15 | 512 | $42.70 | $22K |
| 2026-05-22 | 486 | $44.74 | $22K |
| 2026-05-20 | 32,600 | $42.53 | $1.4M |
| 2026-05-19 | 316 | $41.83 | $13K |
| 2026-05-13 | 33,110 | $44.06 | $1.5M |
| 2026-05-06 | 474 | $48.25 | $23K |
| 2026-05-01 | 109 | $56.14 | $6K |
| 2026-04-28 | 60,000 | $55.07 | $3.3M |
Insider trades
SEC Form 4, newest first. JSONInsiders at INSP reported 1 open-market sell worth $57K in the last 90 days and no open-market buys. Latest filing: Melenikiotou Georgia (Director) on 2026-10-14.
| Date | Insider | Title | Type | Shares | Price | Value | Owned after |
|---|---|---|---|---|---|---|---|
| 2026-10-14 | Melenikiotou Georgia | Director | Grant | 255 | $68.07 | $17K | 9K |
| 2026-10-14 | Ellis Gary Lee | Director | Grant | 431 | $68.07 | $29K | 12K |
| 2026-10-14 | CARREL MICHAEL H | Director | Grant | 203 | $68.07 | $14K | 6K |
| 2026-10-14 | Broader Shelley G | Director | Grant | 284 | $68.07 | $19K | 9K |
| 2026-08-31 | Kelly Jason P | See Remarks | Grant | 6K | $0.00 | $0 | 25K |
| 2026-08-07 | Kelly Jason P | See Remarks | Sell | 963 | $59.55 | $57K | 19K |
| 2026-07-31 | Mann Melissa | Chief People Officer | Tax withholding | 326 | $50.21 | $16K | 23K |
| 2026-07-20 | CARREL MICHAEL H | Director | Grant | 6K | $0.00 | $0 | 6K |
| 2026-07-15 | Melenikiotou Georgia | Director | Grant | 344 | $0.00 | $0 | 8K |
| 2026-07-15 | Tansey Casey M | Director | Grant | 346 | $0.00 | $0 | 27K |
| 2026-07-15 | Ellis Gary Lee | Director | Grant | 581 | $0.00 | $0 | 11K |
| 2026-07-15 | Broader Shelley G | Director | Grant | 383 | $0.00 | $0 | 9K |
| 2026-05-15 | Rondoni John | See Remarks | Sell | 3K | $43.28 | $114K | 27K |
| 2026-05-14 | Rondoni John | See Remarks | Sell | 700 | $43.01 | $30K | 30K |
| 2026-05-08 | mcCormick Shawn | Director | Sell | 696 | $45.31 | $32K | 28K |
| 2026-05-01 | Melenikiotou Georgia | Director | Tax withholding | 50 | $56.70 | $3K | 8K |
| 2026-04-30 | Mead Dana G Jr. | Director | Grant | 4K | $0.00 | $0 | 26K |
| 2026-04-30 | Tansey Casey M | Director | Grant | 4K | $0.00 | $0 | 26K |
| 2026-04-30 | mcCormick Shawn | Director | Grant | 4K | $0.00 | $0 | 28K |
| 2026-04-30 | Melenikiotou Georgia | Director | Grant | 4K | $0.00 | $0 | 8K |
| 2026-04-30 | Ellis Gary Lee | Director | Grant | 4K | $0.00 | $0 | 11K |
| 2026-04-30 | Curet Myriam | Director | Grant | 4K | $0.00 | $0 | 7K |
| 2026-04-30 | Burks Cynthia | Director | Grant | 4K | $0.00 | $0 | 6K |
| 2026-04-30 | Broader Shelley G | Director | Grant | 4K | $0.00 | $0 | 8K |
| 2026-04-15 | Melenikiotou Georgia | Director | Grant | 307 | $52.07 | $16K | 4K |
| 2026-04-15 | Tansey Casey M | Director | Grant | 308 | $52.07 | $16K | 23K |
| 2026-04-15 | Ellis Gary Lee | Director | Grant | 518 | $52.07 | $27K | 7K |
| 2026-04-15 | Broader Shelley G | Director | Grant | 342 | $52.07 | $18K | 5K |
| 2026-02-20 | Phillips Bryan K | See Remarks | Grant | 8K | $0.00 | $0 | 39K |
| 2026-02-20 | Phillips Bryan K | See Remarks | Grant | 16K | $0.00 | $0 | 30K |
| 2026-02-20 | Phillips Bryan K | See Remarks | Tax withholding | 735 | $59.53 | $44K | 14K |
| 2026-02-20 | Phillips Bryan K | See Remarks | Grant | 2K | $0.00 | $0 | 15K |
| 2026-02-20 | Kelly Jason P | See Remarks | Grant | 16K | $0.00 | $0 | 20K |
| 2026-02-20 | Mann Melissa | Chief People Officer | Grant | 16K | $0.00 | $0 | 24K |
| 2026-02-20 | Weatherby Carlton | See Remarks | Grant | 13K | $0.00 | $0 | 42K |
| 2026-02-20 | Weatherby Carlton | See Remarks | Grant | 21K | $0.00 | $0 | 29K |
| 2026-02-20 | Weatherby Carlton | See Remarks | Tax withholding | 672 | $59.53 | $40K | 8K |
| 2026-02-20 | Weatherby Carlton | See Remarks | Grant | 2K | $0.00 | $0 | 9K |
| 2026-02-20 | Rondoni John | See Remarks | Grant | 16K | $0.00 | $0 | 31K |
| 2026-02-20 | Rondoni John | See Remarks | Tax withholding | 735 | $59.53 | $44K | 15K |
| 2026-02-20 | Rondoni John | See Remarks | Grant | 2K | $0.00 | $0 | 15K |
| 2026-02-20 | Herbert Timothy P. | CEO and President | Grant | 62K | $0.00 | $0 | 100K |
| 2026-02-20 | Herbert Timothy P. | CEO and President | Tax withholding | 4K | $59.53 | $239K | 38K |
| 2026-02-20 | Herbert Timothy P. | CEO and President | Grant | 9K | $0.00 | $0 | 42K |
| 2026-02-13 | Mann Melissa | Chief People Officer | Tax withholding | 615 | $59.76 | $37K | 8K |
| 2026-02-13 | Rondoni John | See Remarks | Tax withholding | 587 | $59.76 | $35K | 13K |
| 2026-02-13 | Kelly Jason P | See Remarks | Tax withholding | 551 | $59.76 | $33K | 4K |
| 2026-02-13 | Weatherby Carlton | See Remarks | Tax withholding | 570 | $59.76 | $34K | 7K |
| 2026-02-13 | Phillips Bryan K | See Remarks | Tax withholding | 579 | $59.76 | $35K | 12K |
| 2026-02-13 | Herbert Timothy P. | CEO and President | Tax withholding | 2K | $59.76 | $98K | 33K |
| 2026-02-13 | Buchholz Richard | Interim CFO | Tax withholding | 579 | $59.76 | $35K | 44K |
| 2026-02-09 | Weatherby Carlton | See Remarks | Tax withholding | 327 | $66.33 | $22K | 7K |
| 2026-02-09 | Phillips Bryan K | See Remarks | Tax withholding | 327 | $66.33 | $22K | 13K |
| 2026-02-09 | Rondoni John | See Remarks | Tax withholding | 327 | $66.33 | $22K | 13K |
| 2026-02-09 | Herbert Timothy P. | CEO and President | Tax withholding | 968 | $66.33 | $64K | 34K |
| 2026-02-09 | Buchholz Richard | Interim CFO | Tax withholding | 327 | $66.33 | $22K | 45K |
| 2026-01-15 | Melenikiotou Georgia | Director | Grant | 180 | $96.47 | $17K | 4K |
| 2026-01-15 | Tansey Casey M | Director | Grant | 181 | $96.47 | $17K | 22K |
| 2026-01-15 | Ellis Gary Lee | Director | Grant | 304 | $96.47 | $29K | 7K |
| 2026-01-15 | Broader Shelley G | Director | Grant | 200 | $96.47 | $19K | 5K |
| 2026-01-09 | Rondoni John | See Remarks | Sell | 109 | $100.00 | $11K | 14K |
| 2025-12-02 | mcCormick Shawn | Director | Sell | 1K | $139.00 | $167K | 25K |
| 2025-11-28 | mcCormick Shawn | Director | Sell | 2K | $127.48 | $255K | 26K |
| 2025-10-14 | Melenikiotou Georgia | Director | Grant | 229 | $78.84 | $18K | 4K |
| 2025-10-14 | Tansey Casey M | Director | Grant | 221 | $78.84 | $17K | 22K |
| 2025-10-14 | Ellis Gary Lee | Director | Grant | 372 | $78.84 | $29K | 6K |
| 2025-10-14 | Broader Shelley G | Director | Grant | 245 | $78.84 | $19K | 4K |
| 2025-08-29 | Buchholz Richard | Chief Financial Officer | Sell | 11K | $93.39 | $1.0M | 45K |
| 2025-08-19 | Buchholz Richard | Chief Financial Officer | Tax withholding | 276 | $90.28 | $25K | 56K |
| 2025-08-19 | Buchholz Richard | Chief Financial Officer | Tax withholding | 2K | $90.21 | $221K | 56K |
| 2025-08-19 | Buchholz Richard | Chief Financial Officer | Tax withholding | 3K | $90.24 | $239K | 59K |
| 2025-08-19 | Buchholz Richard | Chief Financial Officer | Exercise or conversion | 7K | $42.15 | $302K | 61K |
| 2025-08-19 | Buchholz Richard | Chief Financial Officer | Exercise or conversion | 18K | $71.00 | $1.3M | 54K |
| 2025-08-08 | Curet Myriam | Director | Sell | 4 | $77.28 | $309 | 3K |
| 2025-07-31 | Mann Melissa | Chief People Officer | Tax withholding | 326 | $124.54 | $41K | 23K |
| 2025-07-15 | Tansey Casey M | Director | Grant | 133 | $128.00 | $17K | 22K |
| 2025-07-15 | Melenikiotou Georgia | Director | Grant | 131 | $128.00 | $17K | 4K |
| 2025-07-15 | Ellis Gary Lee | Director | Grant | 221 | $128.00 | $28K | 6K |
| 2025-07-15 | Broader Shelley G | Director | Grant | 148 | $128.00 | $19K | 4K |
| 2025-06-04 | mcCormick Shawn | Director | Exercise or conversion | 4K | $16.00 | $64K | 28K |
| 2025-05-19 | Rondoni John | See Remarks | Sell | 2K | $149.38 | $259K | 14K |
| 2025-05-08 | Curet Myriam | Director | Sell | 2 | $153.22 | $306 | 3K |
| 2025-05-02 | Melenikiotou Georgia | Director | Tax withholding | 35 | $0.00 | $0 | 4K |
| 2025-05-02 | mcCormick Shawn | Director | Sell | 360 | $160.00 | $58K | 24K |
| 2025-05-01 | Burks Cynthia | Director | Grant | 1K | $0.00 | $0 | 3K |
| 2025-05-01 | Mead Dana G Jr. | Director | Grant | 1K | $0.00 | $0 | 23K |
| 2025-05-01 | Tansey Casey M | Director | Grant | 1K | $0.00 | $0 | 22K |
| 2025-05-01 | Melenikiotou Georgia | Director | Grant | 1K | $0.00 | $0 | 4K |
| 2025-05-01 | Curet Myriam | Director | Grant | 1K | $0.00 | $0 | 3K |
| 2025-05-01 | mcCormick Shawn | Director | Grant | 1K | $0.00 | $0 | 24K |
| 2025-05-01 | Broader Shelley G | Director | Grant | 1K | $0.00 | $0 | 4K |
| 2025-05-01 | Ellis Gary Lee | Director | Grant | 1K | $0.00 | $0 | 6K |
| 2025-04-14 | Broader Shelley G | Director | Grant | 116 | $149.70 | $17K | 3K |
| 2025-04-14 | Melenikiotou Georgia | Director | Grant | 102 | $149.70 | $15K | 2K |
| 2025-04-14 | Ellis Gary Lee | Director | Grant | 169 | $149.70 | $25K | 5K |
| 2025-04-14 | Tansey Casey M | Director | Grant | 103 | $149.70 | $15K | 21K |
| 2025-04-07 | Curet Myriam | Director | Buy | 1 | $148.26 | $148 | 3K |
| 2025-03-20 | Curet Myriam | Director | Buy | 4 | $163.84 | $655 | 3K |
| 2025-03-03 | Rondoni John | Chief Technology Officer | Sell | 2K | $185.60 | $424K | 16K |
| 2025-03-03 | Ban Randy | See Remarks | Sell | 2K | $185.37 | $414K | 9K |
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. JSON8 Form 144 notices on file for INSP worth $654K at the prices reported; 2 in the last 90 days worth $61K. Latest: JOHN RONDONI filed on 2026-08-24 to sell 64 shares ($4K) from 2026-08-24.
| Filed | Seller | Shares | Market value | Of outstanding | Sale from | Broker |
|---|---|---|---|---|---|---|
| 2026-08-24 | JOHN RONDONIOfficer | 64 | $4K | 0.000% | 2026-08-24 | Morgan Stanley Smith Barney LLC Executive Financial Services |
| 2026-08-07 | JASON P KELLYOfficer | 963 | $57K | 0.003% | 2026-08-07 | Morgan Stanley Smith Barney LLC Executive Financial Services |
| 2026-05-15 | JOHN RONDONIOfficer | 3K | $114K | 0.009% | 2026-05-15 | Morgan Stanley Smith Barney LLC Executive Financial Services |
| 2026-05-14 | JOHN RONDONIOfficer | 700 | $30K | 0.002% | 2026-05-14 | Morgan Stanley Smith Barney LLC Executive Financial Services |
| 2026-05-08 | SHAWN T MCCORMICKDirector | 696 | $32K | 0.002% | 2026-05-08 | Morgan Stanley Smith Barney LLC Executive Financial Services |
| 2026-01-09 | JOHN RONDONIOfficer | 109 | $10K | 0.000% | 2026-01-09 | Morgan Stanley Smith Barney LLC Executive Financial Services |
| 2025-12-02 | SHAWN T MCCORMICKDirector | 1K | $152K | 0.004% | 2025-12-02 | Morgan Stanley Smith Barney LLC Executive Financial Services |
| 2025-11-28 | SHAWN T MCCORMICKDirector | 2K | $255K | 0.007% | 2025-11-28 | Morgan Stanley Smith Barney LLC Executive Financial Services |
Large holders (13D and 13G)
One row per reporting person with its latest filing, newest first. JSON17 holders report 5% or more of INSP in their latest filing, all on Schedule 13G (passive). The largest reported stake is BlackRock, Inc. at 14.4% of the class (4,163,016 shares), filed 2026-07-28 for an event on 2026-06-30.
| Filed | Form | Holder | Shares | Of class | Event |
|---|---|---|---|---|---|
| 2026-10-30 | 13G/Ano. 2 | Vanguard Portfolio Managementinvestment adviser | 1.7M | 6.0% | 2026-09-30 |
| 2026-08-13 | 13G/Ano. 1 | Soleus Capital, LLCother entity | 1.9M | 6.7% | 2026-06-30 |
| 2026-08-13 | 13G/Ano. 1 | Soleus Capital Group, LLCother entity | 1.9M | 6.7% | 2026-06-30 |
| 2026-08-13 | 13G/Ano. 1 | Soleus Capital Management, L.P.partnership | 1.9M | 6.7% | 2026-06-30 |
| 2026-08-13 | 13G/Ano. 1 | Soleus GP, LLCother entity | 1.9M | 6.7% | 2026-06-30 |
| 2026-08-13 | 13G/Ano. 1 | Guy Levyindividual | 1.9M | 6.7% | 2026-06-30 |
| 2026-08-13 | 13G/Ano. 1 | Soleus Capital Master Fund, L.P.non-US institution | 1.9M | 6.7% | 2026-06-30 |
| 2026-08-12 | 13G | AQR Capital Management, LLCinvestment adviser | 1.9M | 6.4% | 2026-06-30 |
| 2026-08-12 | 13G | AQR Capital Management Holdings, LLCparent holding company | 1.9M | 6.4% | 2026-06-30 |
| 2026-07-28 | 13G/Ano. 7 | BlackRock, Inc.parent holding company | 4.2M | 14.4% | 2026-06-30 |
| 2026-07-02 | 13G | David E. Shawindividual | 1.5M | 5.1% | 2026-06-25 |
| 2026-07-02 | 13G | D. E. Shaw & Co., L.P.investment adviser, partnership | 1.5M | 5.1% | 2026-06-25 |
| 2026-05-15 | 13G/Ano. 1 | Wellington Investment Advisors Holdings LLPparent holding company | 2.5M | 8.8% | 2026-03-31 |
| 2026-05-15 | 13G/Ano. 1 | Wellington Group Holdings LLPparent holding company | 2.5M | 8.8% | 2026-03-31 |
| 2026-05-15 | 13G/Ano. 1 | Wellington Management Group LLPparent holding company | 2.5M | 8.8% | 2026-03-31 |
| 2026-05-15 | 13G/Ano. 1 | Wellington Management Company LLPinvestment adviser | 2.5M | 8.6% | 2026-03-31 |
| 2026-05-14 | 13G/Ano. 1 | James E. Flynnindividual | 1.3M | 4.5% | 2026-05-14 |
| 2026-05-14 | 13G/Ano. 1 | Deerfield Partners, L.P.partnership | 1.3M | 4.5% | 2026-05-14 |
| 2026-05-14 | 13G/Ano. 1 | Deerfield Management Company, L.P.partnership | 1.3M | 4.5% | 2026-05-14 |
| 2026-05-14 | 13G/Ano. 1 | Deerfield Mgmt, L.P.partnership | 1.3M | 4.5% | 2026-05-14 |
| 2026-04-30 | 13G | Vanguard Capital Managementinvestment adviser | 1.5M | 5.1% | 2026-03-31 |
| 2026-03-27 | 13G/Ano. 4 | The Vanguard Groupinvestment adviser | 0 | 0.0% | 2026-03-13 |
| 2026-02-17 | 13G/Ano. 1 | Kenneth Griffinparent holding company, individual | 527K | 1.8% | 2025-12-31 |
| 2026-02-17 | 13G/Ano. 1 | Citadel Securities Group LPparent holding company, partnership | 353K | 1.2% | 2025-12-31 |
| 2026-02-17 | 13G/Ano. 1 | Citadel Securities GP LLCparent holding company, other entity | 353K | 1.2% | 2025-12-31 |
| 2026-02-17 | 13G/Ano. 1 | Citadel Advisors Holdings LPparent holding company, partnership | 175K | 0.6% | 2025-12-31 |
| 2026-02-17 | 13G/Ano. 1 | Citadel GP LLCparent holding company, other entity | 175K | 0.6% | 2025-12-31 |
| 2026-02-17 | 13G/Ano. 1 | Citadel Advisors LLCinvestment adviser, parent holding company, other entity | 175K | 0.6% | 2025-12-31 |
| 2026-02-17 | 13G/Ano. 1 | Citadel Securities LLCbroker-dealer, other entity | 155K | 0.5% | 2025-12-31 |
| 2025-11-14 | 13G/Ano. 1 | Marc Stadindividual, parent holding company | 0 | 0.0% | 2025-09-30 |
| 2025-11-14 | 13G/Ano. 1 | Dragoneer Investment Group, LLCinvestment adviser, other entity | 0 | 0.0% | 2025-09-30 |
| 2025-11-12 | 13G/Ano. 1 | Wasatch Advisors LPinvestment adviser | 136K | 0.5% | 2025-09-30 |
| 2025-10-07 | 13G/Ano. 4 | FMR LLCparent holding company | 741K | 2.5% | 2025-09-30 |
| 2025-10-07 | 13G/Ano. 4 | Abigail P. Johnsonindividual | 741K | 2.5% | 2025-09-30 |
13F holders
Tracked managers holding INSP at their latest 13F. JSON5 of the 30 tracked managers held INSP at their latest 13F, $192.3M in total at quarter-end prices. AQR Capital Management is the largest at $80.9M (0.0% of its portfolio) as of 2026-06-30. Over the prior quarter 3 added shares and 2 cut.
| Fund | Quarter | Shares | Value | Of portfolio | Change in shares |
|---|---|---|---|---|---|
| AQR Capital Management | 2026-06-30 | 1.9M | $80.9M | 0.03% | +1.5M |
| D. E. Shaw & Co. | 2026-06-30 | 1.5M | $65.6M | 0.03% | +282K |
| Citadel Advisors | 2026-06-30 | 506K | $22.6M | 0.00% | +112K |
| Renaissance Technologies | 2026-06-30 | 426K | $19.0M | 0.03% | -44K |
| Millennium Management | 2026-06-30 | 94K | $4.2M | 0.00% | -292K |
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.
Financials
SEC XBRL, as filed. JSONIn Q2 FY 2026 (quarter ended 2026-06-30) Inspire Medical Systems reported revenue of $200.6M, down 7.6% from the same quarter a year earlier, and net income of $314K (0.01 diluted EPS). In FY 2025 it generated $117.0M of operating cash flow and spent $175.0M on buybacks.
- Cash
- $127.8M
- Equity
- $825.6M
- Total assets
- $926.0M
- Shares outstanding
- 28,910,375
Quarterly, last 8 quarters
| Quarter | Period end | Revenue | Net income | Margin | Diluted EPS |
|---|---|---|---|---|---|
| Q2 FY 2026 | 2026-06-30 | $200.6M | $314K | 0.2% | 0.01 |
| Q1 FY 2026 | 2026-03-31 | $204.6M | -$11.3M | -5.5% | -0.39 |
| Q4 FY 2025derived | 2025-12-31 | $269.1M | $136.1M | 50.6% | n/a |
| Q3 FY 2025 | 2025-09-30 | $224.5M | $9.9M | 4.4% | 0.34 |
| Q2 FY 2025 | 2025-06-30 | $217.1M | -$3.6M | -1.7% | -0.12 |
| Q1 FY 2025 | 2025-03-31 | $201.3M | $3.0M | 1.5% | 0.10 |
| Q4 FY 2024derived | 2024-12-31 | $239.7M | $35.2M | 14.7% | n/a |
| Q3 FY 2024 | 2024-09-30 | $203.2M | $18.5M | 9.1% | 0.60 |
Fiscal years, with buybacks and dividends
| Fiscal year | Ends | Revenue | Net income | Operating cash flow | Capex | Buybacks | Dividends |
|---|---|---|---|---|---|---|---|
| FY 2025 | 2025-12-31 | $912.0M | $145.4M | $117.0M | $38.5M | $175.0M | n/a |
| FY 2024 | 2024-12-31 | $802.8M | $53.5M | $130.2M | $39.1M | $0 | n/a |
| FY 2023 | 2023-12-31 | $624.8M | -$21.2M | $24.7M | $23.6M | $0 | n/a |
| FY 2022 | 2022-12-31 | $407.9M | -$44.9M | $11.6M | $9.1M | $0 | n/a |
| FY 2021 | 2021-12-31 | $233.4M | -$42.0M | -$20.1M | $4.7M | n/a | n/a |
Quarters are the three-month figures the company reports; a fourth quarter marked derived is the fiscal year less the three reported quarters, since companies report it only inside the 10-K. Fiscal years are the annual figures. Buybacks are the cash the company paid to repurchase its common stock in the year, not the amount authorized. Balance sheet lines are as of 2026-06-30; shares outstanding as of 2026-07-30 from the cover page.
What this page is
Inspire Medical Systems 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 Inspire Medical Systems (INSP), SEC CIK 1609550, listed on NYSE, classified by the SEC as surgical & medical instruments & apparatus. 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 2026-10-14.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 2026-08-24.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 2026-10-30.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
- Financials
- SEC EDGAR 10-K and 10-Q filingsSource: SEC.Weekly; values are as filed in the 10-Q and 10-K. 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 2026-11-02.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 2026-10-14.JSON and CSV
- Company record
- EDGAR filing index for CIK 1609550Ticker, 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 INSP is sold short?
4,492,372 shares were held short at the 2026-10-15 settlement, 4.5 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 INSP's daily short volume?
On 2026-11-02, 117,912 of the 395,066 INSP shares reported to FINRA were sold short, 29.8% of the day's reported volume. Short volume is a flow for one day, not a position.
Does INSP have fails to deliver?
The SEC's latest file shows 268,784 INSP shares failed to deliver at settlement 2026-10-14. Fails are reported per settlement date and published twice a month with a lag.
Are INSP insiders buying or selling?
Insiders at INSP reported 1 open-market sell worth $57K in the last 90 days and no open-market buys. Latest filing: Melenikiotou Georgia (Director) on 2026-10-14.
Have INSP insiders filed to sell?
8 Form 144 notices on file for INSP worth $654K at the prices reported; 2 in the last 90 days worth $61K. Latest: JOHN RONDONI filed on 2026-08-24 to sell 64 shares ($4K) from 2026-08-24.
Who owns 5% or more of INSP?
17 holders report 5% or more of INSP in their latest filing, all on Schedule 13G (passive). The largest reported stake is BlackRock, Inc. at 14.4% of the class (4,163,016 shares), filed 2026-07-28 for an event on 2026-06-30.
What did INSP report last quarter?
In Q2 FY 2026 (quarter ended 2026-06-30) Inspire Medical Systems reported revenue of $200.6M, down 7.6% from the same quarter a year earlier, and net income of $314K (0.01 diluted EPS). In FY 2025 it generated $117.0M of operating cash flow and spent $175.0M on buybacks.
Which tracked 13F managers own INSP?
5 of the 30 tracked 13F managers held INSP shares at their latest filing, $192.3M in all. The largest: Cliff Asness's AQR Capital Management (1.9M shares, $80.9M), D. E. Shaw & Co. (1.5M shares, $65.6M), Ken Griffin's Citadel Advisors (506K shares, $22.6M), Renaissance Technologies (426K shares, $19.0M), Izzy Englander's Millennium Management (94K shares, $4.2M).
Data on this page is provided for informational purposes only and is not financial advice. See our editorial policy.