Proto Labs (PRLB)
Proto Labs on one page: short interest, daily short volume, fails to deliver, planned sales, large holders, 13F holders, earnings dates and insider trades. Listed on NYSE, classified by the SEC as fabricated structural metal products.
740K
Short interest
settlement 2026-09-30
2.5
Days to cover
-2.4 days vs prior
63.3%
Short share of volume
2026-10-23
50
Fails to deliver
settlement 2026-09-16
Fri 30 Oct
Next earnings
estimated date
-$903K
Insider flow, 90 days
0 buys, 3 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 PRLB is 739,819 shares, up 124,474 shares over the last month. Over the last 48 readings it ranged from 456,341 shares (15 January 2026) to 1,014,032 shares (31 October 2024). At the reported average volume of 301K 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 | 739,819 | -1.9% | 300,784 | 2.46 |
| 2026-09-15 | 753,948 | +22.5% | 156,444 | 4.82 |
| 2026-08-31 | 615,345 | -6.3% | 174,870 | 3.52 |
| 2026-08-14 | 656,363 | -2.8% | 219,185 | 2.99 |
| 2026-07-31 | 675,490 | -0.1% | 164,302 | 4.11 |
| 2026-07-15 | 676,418 | -0.5% | 245,151 | 2.76 |
| 2026-06-30 | 679,916 | -2.9% | 307,334 | 2.21 |
| 2026-06-15 | 700,174 | +8.7% | 210,085 | 3.33 |
| 2026-05-29 | 644,067 | +0.1% | 192,703 | 3.34 |
| 2026-05-15 | 643,691 | +5.0% | 223,294 | 2.88 |
| 2026-04-30 | 612,973 | -5.4% | 136,626 | 4.49 |
| 2026-04-15 | 647,664 | +2.7% | 145,347 | 4.46 |
| 2026-03-31 | 630,613 | +7.5% | 164,996 | 3.82 |
| 2026-03-13 | 586,703 | +8.5% | 170,364 | 3.44 |
| 2026-02-27 | 540,900 | +1.0% | 174,252 | 3.10 |
| 2026-02-13 | 535,467 | +3.8% | 303,735 | 1.76 |
| 2026-01-30 | 515,791 | +13.0% | 174,554 | 2.95 |
| 2026-01-15 | 456,341 | -1.1% | 131,561 | 3.47 |
| 2025-12-31 | 461,538 | -14.9% | 164,674 | 2.80 |
| 2025-12-15 | 542,670 | -9.8% | 116,755 | 4.65 |
| 2025-11-28 | 601,534 | -14.4% | 161,255 | 3.73 |
| 2025-11-14 | 703,045 | +15.4% | 252,434 | 2.79 |
| 2025-10-31 | 609,446 | +2.8% | 240,359 | 2.54 |
| 2025-10-15 | 593,032 | -6.1% | 174,581 | 3.40 |
| 2025-09-30 | 631,522 | -8.3% | 199,993 | 3.16 |
| 2025-09-15 | 688,674 | +1.2% | 142,589 | 4.83 |
| 2025-08-29 | 680,732 | +1.9% | 168,884 | 4.03 |
| 2025-08-15 | 667,965 | +4.8% | 216,068 | 3.09 |
| 2025-07-31 | 637,698 | -2.9% | 195,198 | 3.27 |
| 2025-07-15 | 656,829 | -13.6% | 144,019 | 4.56 |
| 2025-06-30 | 760,144 | -2.4% | 203,594 | 3.73 |
| 2025-06-13 | 778,584 | -5.1% | 260,039 | 2.99 |
| 2025-05-30 | 820,580 | -2.4% | 181,513 | 4.52 |
| 2025-05-15 | 840,509 | +1.8% | 181,127 | 4.64 |
| 2025-04-30 | 825,600 | -7.3% | 278,977 | 2.96 |
| 2025-04-15 | 890,783 | +10.5% | 212,535 | 4.19 |
| 2025-03-31 | 805,840 | +14.3% | 182,107 | 4.43 |
| 2025-03-14 | 705,112 | -6.7% | 193,138 | 3.65 |
| 2025-02-28 | 755,413 | +11.8% | 246,537 | 3.06 |
| 2025-02-14 | 675,986 | +13.6% | 353,565 | 1.91 |
| 2025-01-31 | 594,935 | -11.2% | 224,149 | 2.65 |
| 2025-01-15 | 669,885 | -1.8% | 155,417 | 4.31 |
| 2024-12-31 | 682,114 | -23.6% | 349,542 | 1.95 |
| 2024-12-13 | 892,811 | +14.3% | 219,882 | 4.06 |
| 2024-11-29 | 781,452 | +9.9% | 262,029 | 2.98 |
| 2024-11-15 | 711,044 | -29.9% | 493,215 | 1.44 |
| 2024-10-31 | 1,014,032 | +4.2% | 162,108 | 6.26 |
| 2024-10-15 | 973,383 | -1.9% | 184,657 | 5.27 |
Daily short volume
FINRA Reg SHO, the last 30 sessions. JSONAs of 23 October 2026, the short share of PRLB volume is 63.3%, up 8.2 points over the last five sessions. Over the last 30 readings it ranged from 39.5% (6 October 2026) to 79.5% (17 September 2026). The latest reading is 2.8 points above the 30-session average of 60.5%, on 54K shares reported.
| Date | Short volume | Total volume | Short share | Exempt |
|---|---|---|---|---|
| 2026-10-23 | 34K | 54K | 63.3% | 140 |
| 2026-10-22 | 40K | 70K | 56.6% | 100 |
| 2026-10-21 | 45K | 60K | 74.8% | 0 |
| 2026-10-20 | 43K | 68K | 64.1% | 0 |
| 2026-10-19 | 34K | 52K | 64.6% | 0 |
| 2026-10-16 | 42K | 76K | 55.0% | 0 |
| 2026-10-15 | 54K | 88K | 61.4% | 0 |
| 2026-10-14 | 37K | 60K | 62.1% | 0 |
| 2026-10-13 | 22K | 33K | 64.5% | 1 |
| 2026-10-12 | 23K | 48K | 48.3% | 0 |
| 2026-10-09 | 37K | 57K | 64.8% | 0 |
| 2026-10-08 | 28K | 47K | 59.0% | 0 |
| 2026-10-07 | 32K | 62K | 51.6% | 0 |
| 2026-10-06 | 50K | 126K | 39.5% | 0 |
| 2026-10-05 | 63K | 80K | 78.3% | 0 |
| 2026-10-02 | 61K | 92K | 65.5% | 0 |
| 2026-10-01 | 34K | 76K | 44.5% | 0 |
| 2026-09-30 | 37K | 55K | 67.1% | 0 |
| 2026-09-29 | 39K | 82K | 47.3% | 0 |
| 2026-09-28 | 51K | 81K | 63.1% | 50 |
| 2026-09-25 | 60K | 95K | 63.6% | 0 |
| 2026-09-24 | 136K | 204K | 66.5% | 0 |
| 2026-09-23 | 37K | 70K | 53.2% | 0 |
| 2026-09-22 | 44K | 72K | 60.5% | 0 |
| 2026-09-21 | 51K | 96K | 53.8% | 0 |
| 2026-09-18 | 49K | 78K | 62.8% | 0 |
| 2026-09-17 | 92K | 116K | 79.5% | 0 |
| 2026-09-16 | 78K | 120K | 64.6% | 0 |
| 2026-09-15 | 23K | 41K | 55.3% | 1 |
| 2026-09-14 | 30K | 51K | 59.4% | 0 |
Fails to deliver
SEC, the last 30 settlement dates with a fail. JSONAs of 16 September 2026, the fails-to-deliver balance in PRLB is 50 shares, down 950 shares over the last settlement date. Over the last 30 readings it ranged from 3 shares (5 January 2026) to 5,257 shares (4 March 2026). The latest reading sits at the bottom of that range.
| Settlement | Shares failed | Price | Value |
|---|---|---|---|
| 2026-09-16 | 50 | $79.09 | $4K |
| 2026-07-20 | 1,000 | $77.62 | $78K |
| 2026-07-17 | 9 | $77.36 | $696 |
| 2026-07-07 | 40 | $77.14 | $3K |
| 2026-06-18 | 17 | $79.57 | $1K |
| 2026-06-15 | 386 | $78.94 | $30K |
| 2026-06-11 | 2,721 | $73.78 | $201K |
| 2026-05-18 | 68 | $72.01 | $5K |
| 2026-05-13 | 2,877 | $71.02 | $204K |
| 2026-05-01 | 2,695 | $64.81 | $175K |
| 2026-04-16 | 113 | $63.24 | $7K |
| 2026-03-31 | 50 | $55.38 | $3K |
| 2026-03-23 | 9 | $55.75 | $502 |
| 2026-03-20 | 10 | $56.65 | $567 |
| 2026-03-10 | 3,534 | $57.59 | $204K |
| 2026-03-05 | 1,686 | $63.13 | $106K |
| 2026-03-04 | 5,257 | $61.96 | $326K |
| 2026-03-02 | 491 | $62.08 | $30K |
| 2026-02-25 | 3,094 | $63.28 | $196K |
| 2026-02-23 | 682 | $65.37 | $45K |
| 2026-02-17 | 132 | $67.52 | $9K |
| 2026-01-28 | 10 | $52.48 | $525 |
| 2026-01-09 | 239 | $54.93 | $13K |
| 2026-01-05 | 3 | $51.35 | $154 |
| 2025-12-22 | 51 | $52.12 | $3K |
| 2025-12-02 | 23 | $50.03 | $1K |
| 2025-10-16 | 157 | $55.22 | $9K |
| 2025-10-14 | 1,965 | $51.04 | $100K |
| 2025-10-02 | 16 | $49.00 | $784 |
| 2025-09-29 | 6 | $50.40 | $302 |
Insider trades
SEC Form 4, newest first. JSONInsiders at PRLB reported 3 open-market sells worth $903K in the last 90 days and no open-market buys. Latest filing: Schumacher Daniel (Chief Financial Officer) on 2026-09-24.
| Date | Insider | Title | Type | Shares | Price | Value | Owned after |
|---|---|---|---|---|---|---|---|
| 2026-09-24 | Schumacher Daniel | Chief Financial Officer | Sell | 5K | $95.32 | $477K | 35K |
| 2026-09-17 | Schumacher Daniel | Chief Financial Officer | Sell | 5K | $85.21 | $418K | 40K |
| 2026-09-16 | Schumacher Daniel | Chief Financial Officer | Sell | 100 | $85.00 | $9K | 45K |
| 2026-06-02 | WEHRWEIN SVEN | Director | Sell | 500 | $78.38 | $39K | 33K |
| 2026-06-02 | WEHRWEIN SVEN | Director | Sell | 2K | $76.91 | $115K | 33K |
| 2026-05-23 | Krishna Suresh | President and CEO | Tax withholding | 1K | $71.36 | $89K | 30K |
| 2026-05-20 | Schumacher Daniel | Chief Financial Officer | Tax withholding | 255 | $71.13 | $18K | 45K |
| 2026-05-20 | Parlange Bernardo | Chief Commercial Officer | Grant | 2K | $0.00 | $0 | 2K |
| 2026-05-19 | WEHRWEIN SVEN | Director | Grant | 2K | $0.00 | $0 | 35K |
| 2026-05-19 | KRANTZ DONALD G | Director | Grant | 2K | $0.00 | $0 | 27K |
| 2026-05-19 | Gawlick Rainer | Director | Grant | 2K | $0.00 | $0 | 46K |
| 2026-05-19 | Chin Moonhie | Director | Grant | 2K | $0.00 | $0 | 22K |
| 2026-05-19 | Chand Sujeet | Director | Grant | 2K | $0.00 | $0 | 27K |
| 2026-05-19 | Black Archie C. | Director | Grant | 2K | $0.00 | $0 | 28K |
| 2026-05-12 | Kenison Michael R. | Chief Operations Officer | Sell | 7K | $70.30 | $467K | 19K |
| 2026-05-12 | Kenison Michael R. | Chief Operations Officer | Sell | 4K | $69.78 | $250K | 25K |
| 2026-05-12 | Kenison Michael R. | Chief Operations Officer | Sell | 4K | $68.70 | $288K | 29K |
| 2026-05-12 | Kenison Michael R. | Chief Operations Officer | Sell | 2K | $67.58 | $109K | 33K |
| 2026-05-12 | Kenison Michael R. | Chief Operations Officer | Exercise or conversion | 4K | $59.40 | $240K | 35K |
| 2026-05-12 | Kenison Michael R. | Chief Operations Officer | Exercise or conversion | 2K | $39.61 | $62K | 31K |
| 2026-05-12 | Kenison Michael R. | Chief Operations Officer | Exercise or conversion | 2K | $33.84 | $65K | 29K |
| 2026-05-11 | Kenison Michael R. | Chief Operations Officer | Sell | 7K | $70.26 | $522K | 27K |
| 2026-05-11 | Kenison Michael R. | Chief Operations Officer | Exercise or conversion | 4K | $33.52 | $123K | 35K |
| 2026-05-11 | Kenison Michael R. | Chief Operations Officer | Exercise or conversion | 4K | $33.84 | $127K | 31K |
| 2026-05-07 | Kenison Michael R. | Chief Operations Officer | Exercise or conversion | 100 | $33.52 | $3K | 27K |
| 2026-05-07 | Kenison Michael R. | Chief Operations Officer | Sell | 200 | $70.00 | $14K | 27K |
| 2026-05-07 | Kenison Michael R. | Chief Operations Officer | Exercise or conversion | 100 | $33.84 | $3K | 27K |
| 2026-02-25 | Schumacher Daniel | Chief Financial Officer | Tax withholding | 504 | $62.63 | $32K | 45K |
| 2026-02-25 | Schumacher Daniel | Chief Financial Officer | Grant | 3K | $0.00 | $0 | 46K |
| 2026-02-25 | Krishna Suresh | President and CEO | Grant | 13K | $0.00 | $0 | 31K |
| 2026-02-25 | Kermisch Marc | Chief Technology & AI Officer | Grant | 3K | $0.00 | $0 | 7K |
| 2026-02-25 | Kenison Michael R. | Chief Operations Officer | Tax withholding | 531 | $62.63 | $33K | 27K |
| 2026-02-25 | Kenison Michael R. | Chief Operations Officer | Grant | 2K | $0.00 | $0 | 28K |
| 2026-02-17 | Kenison Michael R. | Chief Operations Officer | Sell | 5K | $66.46 | $332K | 25K |
| 2026-02-13 | Schumacher Daniel | Chief Financial Officer | Tax withholding | 1K | $67.52 | $86K | 43K |
| 2026-02-13 | Kenison Michael R. | Chief Operations Officer | Tax withholding | 2K | $67.52 | $104K | 30K |
| 2026-02-11 | Schumacher Daniel | Chief Financial Officer | Exercise or conversion | 3K | $33.84 | $106K | 44K |
| 2026-02-10 | Schumacher Daniel | Chief Financial Officer | Tax withholding | 7K | $53.18 | $362K | 41K |
| 2026-02-10 | Kenison Michael R. | Chief Operations Officer | Tax withholding | 3K | $53.18 | $143K | 32K |
| 2026-02-06 | Kenison Michael R. | Chief Operations Officer | Sell | 3K | $60.00 | $150K | 35K |
| 2026-01-29 | Schumacher Daniel | Chief Financial Officer | Grant | 21K | $0.00 | $0 | 48K |
| 2026-01-29 | Kenison Michael R. | Chief Operations Officer | Grant | 8K | $0.00 | $0 | 37K |
| 2025-11-25 | Kenison Michael R. | Chief Operations Officer | Sell | 3K | $50.17 | $153K | 29K |
| 2025-11-25 | Kenison Michael R. | Chief Operations Officer | Sell | 3K | $50.17 | $153K | 29K |
| 2025-11-25 | Kenison Michael R. | Chief Operations Officer | Exercise or conversion | 3K | $33.84 | $103K | 32K |
| 2025-11-17 | Kermisch Marc | Chief Technology & AI Officer | Grant | 4K | $0.00 | $0 | 4K |
| 2025-08-05 | Gawlick Rainer | Director | Buy | 2K | $43.79 | $75K | 44K |
| 2025-08-04 | Krishna Suresh | President and CEO | Buy | 2K | $43.51 | $75K | 18K |
| 2025-05-23 | Krishna Suresh | President and CEO | Grant | 16K | $0.00 | $0 | 16K |
| 2025-05-23 | KRANTZ DONALD G | Director | Grant | 4K | $0.00 | $0 | 25K |
| 2025-05-23 | WEHRWEIN SVEN | Director | Grant | 4K | $0.00 | $0 | 32K |
| 2025-05-23 | Greiner Stacy | Director | Grant | 4K | $0.00 | $0 | 20K |
| 2025-05-23 | Chand Sujeet | Director | Grant | 4K | $0.00 | $0 | 25K |
| 2025-05-23 | Chin Moonhie | Director | Grant | 4K | $0.00 | $0 | 20K |
| 2025-05-23 | Gawlick Rainer | Director | Grant | 4K | $0.00 | $0 | 42K |
| 2025-05-23 | Black Archie C. | Director | Grant | 4K | $0.00 | $0 | 26K |
| 2025-05-20 | Kenison Michael R. | Chief Operations Officer | Tax withholding | 204 | $40.87 | $8K | 29K |
| 2025-05-20 | Schumacher Daniel | Chief Financial Officer | Tax withholding | 305 | $40.87 | $12K | 27K |
| 2025-02-25 | Bodor Robert | President and CEO | Grant | 19K | $0.00 | $0 | 109K |
| 2025-02-25 | Ryaboy Oleg | Chief Technology Officer | Grant | 8K | $0.00 | $0 | 35K |
| 2025-02-25 | Kenison Michael R. | Chief Operations Officer | Grant | 7K | $0.00 | $0 | 29K |
| 2025-02-25 | Schumacher Daniel | Chief Financial Officer | Grant | 4K | $0.00 | $0 | 27K |
| 2025-02-13 | Ryaboy Oleg | Chief Technology Officer | Tax withholding | 2K | $45.03 | $111K | 28K |
| 2025-02-13 | Schumacher Daniel | Chief Financial Officer | Grant | 3K | $0.00 | $0 | 25K |
| 2025-02-13 | Schumacher Daniel | Chief Financial Officer | Tax withholding | 1K | $45.03 | $49K | 24K |
| 2025-02-13 | Schumacher Daniel | Chief Financial Officer | Tax withholding | 1K | $45.03 | $57K | 23K |
| 2025-02-13 | Kenison Michael R. | Chief Operations Officer | Tax withholding | 2K | $45.03 | $76K | 22K |
| 2025-02-13 | Kenison Michael R. | Chief Operations Officer | Tax withholding | 580 | $45.03 | $26K | 24K |
| 2025-02-13 | Kenison Michael R. | Chief Operations Officer | Grant | 2K | $0.00 | $0 | 24K |
| 2025-02-13 | Bodor Robert | President and CEO | Tax withholding | 7K | $45.03 | $327K | 90K |
| 2025-02-13 | Bodor Robert | President and CEO | Tax withholding | 8K | $45.03 | $339K | 97K |
| 2025-02-13 | Bodor Robert | President and CEO | Grant | 24K | $0.00 | $0 | 104K |
| 2024-09-06 | Bodor Robert | President and CEO | Buy | 3K | $28.68 | $100K | 81K |
| 2024-05-23 | WEHRWEIN SVEN | Director | Grant | 5K | $0.00 | $0 | 28K |
| 2024-05-23 | KRANTZ DONALD G | Director | Grant | 5K | $0.00 | $0 | 21K |
| 2024-05-23 | Greiner Stacy | Director | Grant | 5K | $0.00 | $0 | 16K |
| 2024-05-23 | Gawlick Rainer | Director | Grant | 5K | $0.00 | $0 | 38K |
| 2024-05-23 | Chin Moonhie | Director | Grant | 5K | $0.00 | $0 | 16K |
| 2024-05-23 | Chand Sujeet | Director | Grant | 5K | $0.00 | $0 | 21K |
| 2024-05-23 | Black Archie C. | Director | Grant | 5K | $0.00 | $0 | 21K |
| 2024-05-20 | Schumacher Daniel | Chief Financial Officer | Tax withholding | 370 | $31.81 | $12K | 22K |
| 2024-05-20 | Kenison Michael R. | VP and GM of the America's | Tax withholding | 336 | $31.81 | $11K | 22K |
| 2024-02-13 | Bodor Robert | President and CEO | Tax withholding | 4K | $33.52 | $119K | 54K |
| 2024-02-13 | Bodor Robert | President and CEO | Grant | 22K | $0.00 | $0 | 77K |
| 2024-02-13 | Ryaboy Oleg | Chief Technology Officer | Tax withholding | 2K | $33.52 | $57K | 19K |
| 2024-02-13 | Ryaboy Oleg | Chief Technology Officer | Grant | 10K | $0.00 | $0 | 29K |
| 2024-02-13 | Kenison Michael R. | VP and GM of the America's | Grant | 8K | $0.00 | $0 | 22K |
| 2024-02-13 | Kenison Michael R. | VP and GM of the America's | Tax withholding | 1K | $33.52 | $36K | 14K |
| 2024-02-13 | Schumacher Daniel | Chief Financial Officer | Tax withholding | 1K | $33.52 | $34K | 17K |
| 2024-02-13 | Schumacher Daniel | Chief Financial Officer | Grant | 5K | $0.00 | $0 | 23K |
| 2024-02-13 | Klaas Bjoern | VP and Mng Director-PL Europe | Grant | 7K | $0.00 | $0 | 23K |
| 2024-02-13 | Klaas Bjoern | VP and Mng Director-PL Europe | Tax withholding | 2K | $33.52 | $58K | 16K |
| 2023-05-20 | Schumacher Daniel | Chief Financial Officer | Tax withholding | 418 | $32.36 | $14K | 18K |
| 2023-05-17 | KRANTZ DONALD G | Director | Grant | 5K | $0.00 | $0 | 16K |
| 2023-05-17 | WEHRWEIN SVEN | Director | Grant | 5K | $0.00 | $0 | 24K |
| 2023-05-17 | Greiner Stacy | Director | Grant | 5K | $0.00 | $0 | 11K |
| 2023-05-17 | Gawlick Rainer | Director | Grant | 5K | $0.00 | $0 | 34K |
| 2023-05-17 | Chin Moonhie | Director | Grant | 5K | $0.00 | $0 | 11K |
| 2023-05-17 | Chand Sujeet | Director | Grant | 5K | $0.00 | $0 | 16K |
| 2023-05-17 | Black Archie C. | Director | Grant | 5K | $0.00 | $0 | 16K |
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. JSON18 Form 144 notices on file for PRLB worth $6.1M at the prices reported; 6 in the last 90 days worth $2.1M. Latest: MICHAEL R KENISON filed on 2026-09-25 to sell 1,143 shares ($109K) from 2026-09-25.
| Filed | Seller | Shares | Market value | Of outstanding | Sale from | Broker |
|---|---|---|---|---|---|---|
| 2026-09-25 | MICHAEL R KENISONFormer Officer | 1K | $109K | 0.005% | 2026-09-25 | Morgan Stanley Smith Barney LLC Executive Financial Services |
| 2026-09-24 | DANIEL SCHUMACHEROfficer | 5K | $446K | 0.021% | 2026-09-24 | Morgan Stanley Smith Barney LLC Executive Financial Services |
| 2026-09-24 | MICHAEL R KENISONFormer Officer | 2K | $173K | 0.008% | 2026-09-24 | Morgan Stanley Smith Barney LLC Executive Financial Services |
| 2026-09-17 | DANIEL SCHUMACHEROfficer | 5K | $408K | 0.020% | 2026-09-17 | Morgan Stanley Smith Barney LLC Executive Financial Services |
| 2026-09-16 | DANIEL SCHUMACHEROfficer | 100 | $8K | 0.000% | 2026-09-16 | Morgan Stanley Smith Barney LLC Executive Financial Services |
| 2026-08-04 | MICHAEL R KENISONFormer Officer | 11K | $948K | 0.045% | 2026-08-04 | Morgan Stanley Smith Barney LLC Executive Financial Services |
| 2026-06-01 | WEHRWEIN SVENDirector | 2K | $152K | 0.008% | 2026-06-01 | FIDELITY BROKERAGE SERVICES, LLC |
| 2026-05-12 | MICHAEL R KENISONOfficer | 16K | $1.1M | 0.067% | 2026-05-12 | Morgan Stanley Smith Barney LLC Executive Financial Services |
| 2026-05-11 | MICHAEL KENISONOfficer | 7K | $515K | 0.031% | 2026-05-11 | Morgan Stanley Smith Barney LLC Executive Financial Services |
| 2026-05-07 | MICHAEL KENISONOfficer | 200 | $14K | 0.001% | 2026-05-07 | Morgan Stanley Smith Barney LLC Executive Financial Services |
| 2026-02-06 | MICHAEL KENISONOfficer | 8K | $394K | 0.032% | 2026-02-06 | Morgan Stanley Smith Barney LLC Executive Financial Services |
| 2026-01-16 | OLEG RYABOYFormer Officer | 368 | $20K | 0.002% | 2026-01-16 | Morgan Stanley Smith Barney LLC Executive Financial Services |
| 2026-01-15 | OLEG RYABOYFormer Officer | 7K | $393K | 0.030% | 2026-01-15 | Morgan Stanley Smith Barney LLC Executive Financial Services |
| 2026-01-08 | OLEG RYABOYFormer Officer | 7K | $384K | 0.030% | 2026-01-08 | Morgan Stanley Smith Barney LLC Executive Financial Services |
| 2026-01-07 | OLEG RYABOYFormer Officer | 7K | $357K | 0.028% | 2026-01-07 | Morgan Stanley Smith Barney LLC Executive Financial Services |
| 2025-11-25 | OLEG RYABOYFormer Officer | 695 | $35K | 0.003% | 2025-11-25 | Morgan Stanley Smith Barney LLC Executive Financial Services |
| 2025-11-25 | MICHAEL KENISONOfficer | 3K | $150K | 0.013% | 2025-11-25 | Morgan Stanley Smith Barney LLC Executive Financial Services |
| 2025-11-07 | OLEG RYABOYFormer Officer | 10K | $472K | 0.041% | 2025-11-07 | Morgan Stanley Smith Barney LLC Executive Financial Services |
Large holders (13D and 13G)
One row per reporting person with its latest filing, newest first. JSON3 holders report 5% or more of PRLB in their latest filing, all on Schedule 13G (passive). The largest reported stake is DISCIPLINED GROWTH INVESTORS INC /MN at 10.0% of the class (2,380,514 shares), filed 2026-08-14 for an event on 2026-06-30.
| Filed | Form | Holder | Shares | Of class | Event |
|---|---|---|---|---|---|
| 2026-08-14 | 13G/Ano. 9 | DISCIPLINED GROWTH INVESTORS INC /MNinvestment adviser | 2.4M | 10.0% | 2026-06-30 |
| 2026-07-14 | 13G/Ano. 1 | Dimensional Fund Advisors LPinvestment adviser | 1.2M | 4.8% | 2026-06-30 |
| 2026-04-30 | 13G | Vanguard Capital Managementinvestment adviser | 1.2M | 5.1% | 2026-03-31 |
| 2026-04-29 | 13G | Vanguard Portfolio Managementinvestment adviser | 1.5M | 6.5% | 2026-03-31 |
| 2026-03-27 | 13G/Ano. 12 | The Vanguard Groupinvestment adviser | 0 | 0.0% | 2026-03-13 |
13F holders
Tracked managers holding PRLB at their latest 13F. JSON8 of the 30 tracked managers held PRLB at their latest 13F, $81.6M in total at quarter-end prices. Renaissance Technologies is the largest at $38.2M (0.1% of its portfolio) as of 2026-06-30. Over the prior quarter 4 added shares and 4 cut.
| Fund | Quarter | Shares | Value | Of portfolio | Change in shares |
|---|---|---|---|---|---|
| Renaissance Technologies | 2026-06-30 | 469K | $38.2M | 0.05% | -51K |
| D. E. Shaw & Co. | 2026-06-30 | 211K | $17.2M | 0.01% | -14K |
| Millennium Management | 2026-06-30 | 93K | $7.6M | 0.00% | +67K |
| Citadel Advisors | 2026-06-30 | 89K | $7.2M | 0.00% | +44K |
| AQR Capital Management | 2026-06-30 | 53K | $4.3M | 0.00% | -2K |
| Point72 Asset Management | 2026-06-30 | 37K | $3.0M | 0.00% | +5K |
| ARK Investment Management | 2026-06-30 | 35K | $2.9M | 0.02% | -10K |
| Two Sigma Investments | 2026-06-30 | 13K | $1.0M | 0.00% | +534 |
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
Proto Labs 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 Proto Labs (PRLB), SEC CIK 1443669, listed on NYSE, classified by the SEC as fabricated structural metal products. 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 2026-09-16.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 2026-09-25.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 2026-07-31.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 2026-09-24.JSON and CSV
- Company record
- EDGAR filing index for CIK 1443669Ticker, 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 PRLB is sold short?
739,819 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 PRLB's daily short volume?
On 2026-10-23, 33,950 of the 53,671 PRLB shares reported to FINRA were sold short, 63.3% of the day's reported volume. Short volume is a flow for one day, not a position.
Does PRLB have fails to deliver?
The SEC's latest file shows 50 PRLB shares failed to deliver at settlement 2026-09-16. Fails are reported per settlement date and published twice a month with a lag.
Are PRLB insiders buying or selling?
Insiders at PRLB reported 3 open-market sells worth $903K in the last 90 days and no open-market buys. Latest filing: Schumacher Daniel (Chief Financial Officer) on 2026-09-24.
Have PRLB insiders filed to sell?
18 Form 144 notices on file for PRLB worth $6.1M at the prices reported; 6 in the last 90 days worth $2.1M. Latest: MICHAEL R KENISON filed on 2026-09-25 to sell 1,143 shares ($109K) from 2026-09-25.
Who owns 5% or more of PRLB?
3 holders report 5% or more of PRLB in their latest filing, all on Schedule 13G (passive). The largest reported stake is DISCIPLINED GROWTH INVESTORS INC /MN at 10.0% of the class (2,380,514 shares), filed 2026-08-14 for an event on 2026-06-30.
Which tracked 13F managers own PRLB?
8 of the 30 tracked 13F managers held PRLB shares at their latest filing, $81.6M in all. The largest: Renaissance Technologies (469K shares, $38.2M), D. E. Shaw & Co. (211K shares, $17.2M), Izzy Englander's Millennium Management (93K shares, $7.6M), Ken Griffin's Citadel Advisors (89K shares, $7.2M), Cliff Asness's AQR Capital Management (53K shares, $4.3M), Steve Cohen's Point72 Asset Management (37K shares, $3.0M). The table above lists all 8.
Data on this page is provided for informational purposes only and is not financial advice. See our editorial policy.