908 Devices (MASS)
908 Devices 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 Nasdaq, classified by the SEC as laboratory analytical instruments.
2.7M
Short interest
settlement 2026-09-30
6.5
Days to cover
-2.8 days vs prior
54.3%
Short share of volume
2026-10-09
4,633
Fails to deliver
settlement 2026-08-31
Mon 9 Nov
Next earnings
estimated date
-$4.7M
Insider flow, 90 days
0 buys, 22 sells
As of 2026-10-09.
Short interest
FINRA, twice a month. The newest 24 settlements in the table, 48 in the chart. JSONAs of 30 September 2026, short interest in MASS is 2,727,932 shares, down 81,535 shares over the last month. Over the last 48 readings it ranged from 1,370,405 shares (15 October 2024) to 3,876,393 shares (27 February 2026). At the reported average volume of 422K shares a day that is 6.5 days to cover.
Embed this chart.The embed keeps its attribution line.
<iframe src="https://xoomar.com/embed/stocks/mass" width="100%" height="440" style="border:0;max-width:100%" loading="lazy" title="XOOMAR chart"></iframe>
| Settlement | Shares short | Change | Avg daily volume | Days to cover |
|---|---|---|---|---|
| 2026-09-30 | 2,727,932 | -0.7% | 421,862 | 6.47 |
| 2026-09-15 | 2,746,771 | -2.2% | 295,641 | 9.29 |
| 2026-08-31 | 2,809,467 | +0.6% | 506,686 | 5.54 |
| 2026-08-14 | 2,792,533 | -17.6% | 551,482 | 5.06 |
| 2026-07-31 | 3,389,065 | +4.8% | 307,527 | 11.02 |
| 2026-07-15 | 3,234,821 | +5.0% | 216,223 | 14.96 |
| 2026-06-30 | 3,079,686 | -3.9% | 445,876 | 6.91 |
| 2026-06-15 | 3,206,098 | +1.0% | 233,153 | 13.75 |
| 2026-05-29 | 3,174,344 | -5.0% | 279,243 | 11.37 |
| 2026-05-15 | 3,343,043 | -3.9% | 316,199 | 10.57 |
| 2026-04-30 | 3,477,845 | +0.0% | 230,455 | 15.09 |
| 2026-04-15 | 3,477,200 | -4.1% | 253,596 | 13.71 |
| 2026-03-31 | 3,627,295 | -3.3% | 270,943 | 13.39 |
| 2026-03-13 | 3,752,369 | -3.2% | 331,399 | 11.32 |
| 2026-02-27 | 3,876,393 | +1.3% | 184,525 | 21.01 |
| 2026-02-13 | 3,828,392 | +20.0% | 333,907 | 11.47 |
| 2026-01-30 | 3,189,641 | -4.1% | 439,073 | 7.26 |
| 2026-01-15 | 3,324,662 | +0.5% | 283,329 | 11.73 |
| 2025-12-31 | 3,307,634 | +6.9% | 691,564 | 4.78 |
| 2025-12-15 | 3,095,434 | +10.9% | 350,743 | 8.83 |
| 2025-11-28 | 2,791,075 | +23.7% | 435,868 | 6.40 |
| 2025-11-14 | 2,256,517 | +15.6% | 427,714 | 5.28 |
| 2025-10-31 | 1,951,697 | +0.8% | 249,812 | 7.81 |
| 2025-10-15 | 1,935,261 | +2.8% | 368,662 | 5.25 |
Daily short volume
FINRA Reg SHO, the last 30 sessions. JSONAs of 9 October 2026, the short share of MASS volume is 54.3%, down 16.6 points over the last five sessions. Over the last 30 readings it ranged from 38.6% (7 October 2026) to 86.7% (18 September 2026). The latest reading is 11.6 points below the 30-session average of 65.9%, on 97K shares reported.
| Date | Short volume | Total volume | Short share | Exempt |
|---|---|---|---|---|
| 2026-10-09 | 53K | 97K | 54.3% | 0 |
| 2026-10-08 | 44K | 80K | 54.6% | 110 |
| 2026-10-07 | 69K | 180K | 38.6% | 0 |
| 2026-10-06 | 71K | 107K | 66.2% | 0 |
| 2026-10-05 | 69K | 150K | 46.2% | 194 |
| 2026-10-02 | 123K | 173K | 71.0% | 3,230 |
| 2026-10-01 | 152K | 223K | 68.2% | 300 |
| 2026-09-30 | 117K | 179K | 65.3% | 1,400 |
| 2026-09-29 | 134K | 175K | 76.9% | 0 |
| 2026-09-28 | 51K | 99K | 51.1% | 0 |
| 2026-09-25 | 57K | 104K | 55.3% | 0 |
| 2026-09-24 | 66K | 136K | 48.4% | 100 |
| 2026-09-23 | 54K | 72K | 74.9% | 0 |
| 2026-09-22 | 81K | 139K | 58.1% | 302 |
| 2026-09-21 | 91K | 124K | 73.3% | 203 |
| 2026-09-18 | 88K | 102K | 86.7% | 75 |
| 2026-09-17 | 173K | 240K | 72.2% | 0 |
| 2026-09-16 | 53K | 69K | 76.8% | 0 |
| 2026-09-15 | 46K | 62K | 74.7% | 0 |
| 2026-09-14 | 56K | 80K | 69.8% | 0 |
| 2026-09-11 | 45K | 78K | 57.0% | 0 |
| 2026-09-10 | 68K | 93K | 73.3% | 320 |
| 2026-09-09 | 58K | 77K | 74.7% | 0 |
| 2026-09-08 | 52K | 78K | 67.2% | 1,000 |
| 2026-09-04 | 43K | 71K | 61.2% | 0 |
| 2026-09-03 | 68K | 103K | 66.0% | 355 |
| 2026-09-02 | 164K | 204K | 80.4% | 10,516 |
| 2026-09-01 | 127K | 176K | 71.9% | 901 |
| 2026-08-31 | 61K | 83K | 73.2% | 0 |
| 2026-08-28 | 173K | 246K | 70.2% | 20,768 |
Fails to deliver
SEC, the last 30 settlement dates with a fail. JSONAs of 31 August 2026, the fails-to-deliver balance in MASS is 4,633 shares, up 2,932 shares over the last settlement date. Over the last 30 readings it ranged from 10 shares (24 April 2026) to 71,263 shares (30 June 2026). The latest reading sits at the bottom of that range.
| Settlement | Shares failed | Price | Value |
|---|---|---|---|
| 2026-08-31 | 4,633 | $10.73 | $50K |
| 2026-08-25 | 1,701 | $10.92 | $19K |
| 2026-08-19 | 252 | $10.08 | $3K |
| 2026-08-11 | 7,492 | $8.80 | $66K |
| 2026-08-06 | 532 | $8.41 | $4K |
| 2026-08-05 | 17,348 | $8.45 | $147K |
| 2026-08-03 | 561 | $8.01 | $4K |
| 2026-07-30 | 7,422 | $7.60 | $56K |
| 2026-07-29 | 3,805 | $7.03 | $27K |
| 2026-07-28 | 71 | $7.13 | $506 |
| 2026-07-27 | 890 | $7.14 | $6K |
| 2026-07-21 | 762 | $7.03 | $5K |
| 2026-07-17 | 29 | $7.41 | $215 |
| 2026-07-16 | 5,433 | $8.05 | $44K |
| 2026-07-14 | 2,417 | $7.95 | $19K |
| 2026-07-02 | 1,031 | $8.88 | $9K |
| 2026-07-01 | 171 | $8.70 | $1K |
| 2026-06-30 | 71,263 | $8.81 | $628K |
| 2026-06-26 | 5,833 | $8.98 | $52K |
| 2026-06-25 | 329 | $8.97 | $3K |
| 2026-06-24 | 6,298 | $8.73 | $55K |
| 2026-06-12 | 4,351 | $8.22 | $36K |
| 2026-06-04 | 182 | $8.66 | $2K |
| 2026-05-26 | 135 | $7.28 | $983 |
| 2026-05-12 | 11,597 | $7.93 | $92K |
| 2026-05-08 | 10 | $8.08 | $81 |
| 2026-05-05 | 1,310 | $6.55 | $9K |
| 2026-05-01 | 325 | $6.83 | $2K |
| 2026-04-24 | 10 | $6.76 | $68 |
| 2026-04-23 | 15 | $7.13 | $107 |
Insider trades
SEC Form 4, newest first, 50 of 100 shown. JSONInsiders at MASS reported 22 open-market sells worth $4.7M in the last 90 days and no open-market buys. Latest filing: Brown Christopher D. (Director) on 2026-10-07.
| Date | Insider | Title | Type | Shares | Price | Value | Owned after |
|---|---|---|---|---|---|---|---|
| 2026-10-07 | Brown Christopher D. | Director | Option exercise | 60K | $1.75 | $105K | 806K |
| 2026-10-07 | Brown Christopher D. | Director | Sell | 30K | $11.89 | $357K | 746K |
| 2026-10-06 | Griffith Joseph H. IV | Chief Financial Officer | Sell | 5K | $13.03 | $65K | 116K |
| 2026-09-29 | AWM Investment Company, Inc. | 10% owner | Sell | 18K | $11.52 | $207K | 4.7M |
| 2026-09-24 | AWM Investment Company, Inc. | 10% owner | Sell | 24K | $11.36 | $273K | 4.8M |
| 2026-09-23 | AWM Investment Company, Inc. | 10% owner | Sell | 1K | $11.25 | $11K | 4.8M |
| 2026-09-17 | Kenneweg John | SVP, Sales & Product Marketing | Sell | 5K | $10.22 | $54K | 58K |
| 2026-09-17 | Kenneweg John | SVP, Sales & Product Marketing | Option exercise | 5K | $0.96 | $5K | 63K |
| 2026-09-16 | Kenneweg John | SVP, Sales & Product Marketing | Sell | 21K | $10.11 | $216K | 58K |
| 2026-09-16 | Kenneweg John | SVP, Sales & Product Marketing | Option exercise | 21K | $0.96 | $21K | 79K |
| 2026-09-15 | Kenneweg John | SVP, Sales & Product Marketing | Sell | 1K | $10.00 | $10K | 58K |
| 2026-09-15 | Kenneweg John | SVP, Sales & Product Marketing | Option exercise | 1K | $0.96 | $960 | 59K |
| 2026-09-02 | Brown Christopher D. | Director | Sell | 30K | $10.58 | $317K | 776K |
| 2026-08-25 | Griffith Joseph H. IV | Chief Financial Officer | Sell | 11K | $10.95 | $125K | 121K |
| 2026-08-21 | AWM Investment Company, Inc. | 10% owner | Sell | 42K | $10.61 | $441K | 4.8M |
| 2026-08-20 | AWM Investment Company, Inc. | 10% owner | Sell | 8K | $10.52 | $89K | 4.8M |
| 2026-08-17 | Knopp Kevin J. | President and CEO | Sell | 20K | $10.35 | $207K | 556K |
| 2026-08-13 | Knopp Kevin J. | President and CEO | Sell | 8K | $10.06 | $77K | 576K |
| 2026-08-12 | Knopp Kevin J. | President and CEO | Sell | 3K | $10.07 | $28K | 584K |
| 2026-08-11 | Brown Christopher D. | Director | Sell | 8K | $9.23 | $77K | 806K |
| 2026-08-11 | Knopp Kevin J. | President and CEO | Sell | 30K | $10.16 | $307K | 586K |
| 2026-08-11 | Knopp Kevin J. | President and CEO | Sell | 116K | $9.83 | $1.1M | 617K |
| 2026-08-10 | Brown Christopher D. | Director | Sell | 9K | $9.03 | $85K | 814K |
| 2026-08-10 | Knopp Kevin J. | President and CEO | Sell | 348 | $9.06 | $3K | 732K |
| 2026-08-05 | Brown Christopher D. | Director | Sell | 20K | $8.49 | $170K | 823K |
| 2026-08-04 | AWM Investment Company, Inc. | 10% owner | Sell | 50K | $8.36 | $418K | 4.8M |
| 2026-08-01 | Vann Brandi C | Director | Option exercise | 5K | price not stated in the filing | not stated | 5K |
| 2026-07-02 | Brown Christopher D. | Director | Sell | 2K | $9.02 | $20K | 843K |
| 2026-07-02 | Knopp Kevin J. | President and CEO | Sell | 222 | $9.07 | $2K | 733K |
| 2026-06-30 | Brown Christopher D. | Director | Sell | 20K | $8.84 | $177K | 846K |
| 2026-06-26 | Knopp Kevin J. | President and CEO | Sell | 3K | $9.09 | $25K | 733K |
| 2026-06-25 | Leonhart Michele M. | Director | Option exercise | 6K | price not stated in the filing | not stated | 27K |
| 2026-06-25 | Knopp Kevin J. | President and CEO | Sell | 16K | $9.10 | $149K | 736K |
| 2026-06-24 | Knopp Kevin J. | President and CEO | Sell | 41K | $9.14 | $370K | 752K |
| 2026-06-23 | Brown Christopher D. | Director | Sell | 10K | $9.04 | $89K | 866K |
| 2026-06-23 | Knopp Kevin J. | President and CEO | Sell | 3K | $9.06 | $31K | 793K |
| 2026-06-23 | AWM Investment Company, Inc. | 10% owner | Sell | 3K | $9.00 | $27K | 4.9M |
| 2026-06-22 | AWM Investment Company, Inc. | 10% owner | Sell | 5K | $8.99 | $42K | 4.9M |
| 2026-06-10 | Spoto Mark | Director | Option exercise | 14K | price not stated in the filing | not stated | 89K |
| 2026-06-10 | CRANDELL KEITH | Director | Option exercise | 14K | price not stated in the filing | not stated | 39K |
| 2026-06-10 | ELOI FENEL M | Director | Option exercise | 14K | price not stated in the filing | not stated | 41K |
| 2026-06-10 | Hunt Anthony | Director | Option exercise | 14K | price not stated in the filing | not stated | 44K |
| 2026-06-10 | HRUSOVSKY E KEVIN | Director | Option exercise | 14K | price not stated in the filing | not stated | 165K |
| 2026-06-10 | Leonhart Michele M. | Director | Option exercise | 14K | price not stated in the filing | not stated | 21K |
| 2026-06-04 | AWM Investment Company, Inc. | 10% owner | Sell | 40K | $8.97 | $357K | 4.9M |
| 2026-06-04 | Brown Christopher D. | Director | Sell | 100 | $9.00 | $900 | 875K |
| 2026-06-03 | Brown Christopher D. | Director | Sell | 20K | $8.73 | $175K | 876K |
| 2026-06-02 | AWM Investment Company, Inc. | 10% owner | Sell | 3K | $8.95 | $22K | 4.9M |
| 2026-05-28 | Brown Christopher D. | Director | Sell | 30K | $9.00 | $270K | 896K |
| 2026-05-28 | AWM Investment Company, Inc. | 10% owner | Sell | 170K | $8.66 | $1.5M | 4.9M |
Form 4 filings are due within two business days of the trade. Insiders sell for many reasons that say nothing about the company; open-market buys are rarer.
Planned sales (Form 144)
Newest first. JSON11 Form 144 notices on file for MASS worth $3.1M at the prices reported; 4 in the last 90 days worth $1.3M. Latest: Joseph Griffith filed on 2026-10-06 to sell 5,000 shares ($64K) from 2026-10-06.
| Filed | Seller | Shares | Market value | Of outstanding | Sale from | Broker |
|---|---|---|---|---|---|---|
| 2026-10-06 | Joseph GriffithOfficer | 5K | $64K | 0.012% | 2026-10-06 | Morgan Stanley Smith Barney LLC Executive Financial Services |
| 2026-09-15 | John KennewegOfficer | 28K | $269K | 0.067% | 2026-09-15 | Morgan Stanley Smith Barney LLC Executive Financial Services |
| 2026-08-25 | Joseph GriffithOfficer | 11K | $125K | 0.028% | 2026-08-25 | Morgan Stanley Smith Barney LLC Executive Financial Services |
| 2026-08-10 | CHRISTOPHER BROWNDirector | 100K | $888K | 0.264% | 2026-08-10 | Morgan Stanley Smith Barney LLC Executive Financial Services |
| 2026-06-03 | CHRISTOPHER BROWNOfficer | 70K | $620K | 0.185% | 2026-06-03 | Morgan Stanley Smith Barney LLC Executive Financial Services |
| 2026-05-28 | JOSEPH GRIFFITHOfficer | 7K | $57K | 0.018% | 2026-05-28 | Morgan Stanley Smith Barney LLC Executive Financial Services |
| 2026-05-08 | JOHN WESLEY KENNEWEGOfficer, Director | 18K | $148K | 0.048% | 2026-05-08 | Morgan Stanley Smith Barney LLC Executive Financial Services |
| 2026-04-08 | KEVIN MCCALLIONOfficer | 27K | $183K | 0.072% | 2026-04-08 | Morgan Stanley Smith Barney LLC Executive Financial Services |
| 2026-04-08 | CHRISTOPHER BROWNDirector | 100K | $676K | 0.268% | 2026-04-08 | Morgan Stanley Smith Barney LLC Executive Financial Services |
| 2025-10-02 | JOSEPH H GRIFFITH IVOfficer | 5K | $45K | 0.014% | 2025-10-02 | Morgan Stanley Smith Barney LLC Executive Financial Services |
| 2025-09-19 | JOSEPH H GRIFFITH IVOfficer | 5K | $34K | 0.014% | 2025-09-19 | Morgan Stanley Smith Barney LLC Executive Financial Services |
Large holders (13D and 13G)
One row per reporting person with its latest filing, newest first. JSON12 holders report 5% or more of MASS in their latest filing, all on Schedule 13G (passive). The largest reported stake is Mathew P. Arens at 17.1% of the class (6,184,739 shares), filed 2026-02-17 for an event on 2025-12-31.
| Filed | Form | Holder | Shares | Of class | Event |
|---|---|---|---|---|---|
| 2026-08-14 | 13G/Ano. 1 | AWM Investment Company, Inc.investment adviser | 4.9M | 11.8% | 2026-06-30 |
| 2026-08-14 | 13G/Ano. 9 | ARK Investment Management LLCinvestment adviser | 2.0M | 5.3% | 2026-06-30 |
| 2026-08-14 | 13G/Ano. 9 | Catherine D. Woodparent holding company, individual | 2.0M | 5.3% | 2026-06-30 |
| 2026-08-14 | 13G/Ano. 6 | Keith Crandellindividual | 5.8M | 14.1% | 2026-06-30 |
| 2026-08-14 | 13G/Ano. 6 | ARCH Venture Partners VII, LLCother entity | 5.7M | 13.9% | 2026-06-30 |
| 2026-08-14 | 13G/Ano. 6 | ARCH Venture Partners VII, L.P.partnership | 5.7M | 13.9% | 2026-06-30 |
| 2026-08-14 | 13G/Ano. 6 | Clinton Bybeeindividual | 5.7M | 13.9% | 2026-06-30 |
| 2026-08-14 | 13G/Ano. 6 | Robert Nelsenindividual | 5.7M | 13.9% | 2026-06-30 |
| 2026-08-14 | 13G/Ano. 6 | ARCH Venture Fund VII, L.P.partnership | 5.7M | 13.9% | 2026-06-30 |
| 2026-07-27 | 13G | BlackRock, Inc.parent holding company | 1.9M | 5.1% | 2026-06-30 |
| 2026-02-17 | 13G/Ano. 2 | Mathew P. Arensindividual | 6.2M | 17.1% | 2025-12-31 |
| 2026-02-17 | 13G/Ano. 2 | First Light Asset Management, LLCinvestment adviser | 6.0M | 16.5% | 2025-12-31 |
| 2026-02-09 | 13G | STATE STREET CORPORATIONparent holding company | 596K | 1.6% | 2025-12-31 |
| 2026-02-09 | 13G | SSGA FUNDS MANAGEMENT, INC.investment adviser | 135K | 0.4% | 2025-12-31 |
13F holders
Tracked managers holding MASS at their latest 13F. JSON5 of the 30 tracked managers held MASS at their latest 13F, $21.4M in total at quarter-end prices. ARK Investment Management is the largest at $17.6M (0.1% of its portfolio) as of 2026-06-30. Over the prior quarter 2 added shares and 3 cut.
| Fund | Quarter | Shares | Value | Of portfolio | Change in shares |
|---|---|---|---|---|---|
| ARK Investment Management | 2026-06-30 | 2.0M | $17.6M | 0.11% | +81K |
| Renaissance Technologies | 2026-06-30 | 192K | $1.7M | 0.00% | -38K |
| AQR Capital Management | 2026-06-30 | 104K | $904K | 0.00% | -497 |
| D. E. Shaw & Co. | 2026-06-30 | 75K | $656K | 0.00% | new |
| Citadel Advisors | 2026-06-30 | 63K | $546K | 0.00% | -82K |
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) 908 Devices reported revenue of $16.1M, up 23.3% from the same quarter a year earlier, and net loss of $11.9M (-0.32 diluted EPS). In FY 2025 it generated -$23.7M of operating cash flow.
- Cash
- $63.0M
- Equity
- $126.8M
- Total assets
- $197.5M
- Shares outstanding
- 41,333,705
Quarterly, last 8 quarters
| Quarter | Period end | Revenue | Net income | Margin | Diluted EPS |
|---|---|---|---|---|---|
| Q2 FY 2026 | 2026-06-30 | $16.1M | -$11.9M | -74.0% | -0.32 |
| Q1 FY 2026 | 2026-03-31 | $13.4M | -$12.0M | -89.3% | -0.32 |
| Q4 FY 2025derived | 2025-12-31 | $17.4M | $4.2M | 24.0% | n/a |
| Q3 FY 2025 | 2025-09-30 | $14.0M | -$15.0M | -107.0% | -0.41 |
| Q2 FY 2025 | 2025-06-30 | $13.0M | -$13.3M | -102.1% | -0.37 |
| Q1 FY 2025 | 2025-03-31 | $11.8M | $43.6M | 370.2% | 1.23 |
| Q4 FY 2024derived | 2024-12-31 | $14.3M | -$19.4M | -135.6% | n/a |
| Q3 FY 2024 | 2024-09-30 | $14.5M | -$29.3M | -201.8% | -0.84 |
Fiscal years, with buybacks and dividends
| Fiscal year | Ends | Revenue | Net income | Operating cash flow | Capex | Buybacks | Dividends |
|---|---|---|---|---|---|---|---|
| FY 2025 | 2025-12-31 | $56.2M | $19.5M | -$23.7M | $955K | n/a | n/a |
| FY 2024 | 2024-12-31 | $47.7M | -$72.2M | -$30.2M | $602K | n/a | n/a |
| FY 2023 | 2023-12-31 | $50.2M | -$36.4M | -$25.1M | $2.0M | n/a | n/a |
| FY 2022 | 2022-12-31 | $46.9M | -$33.6M | -$20.9M | $2.0M | n/a | n/a |
| FY 2021 | 2021-12-31 | $42.2M | -$22.2M | -$29.1M | $737K | 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 2026-08-07 from the cover page.
What this page is
908 Devices 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 908 Devices (MASS), SEC CIK 1555279, listed on Nasdaq, classified by the SEC as laboratory analytical instruments. 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 2026-10-09.JSON and CSV
- Fails to deliver
- SEC fails-to-deliver dataSource: SEC.Twice a month, a few weeks after the half month ends. Latest 2026-08-31.JSON and CSV
- Planned sales
- SEC EDGAR Form 144Source: SEC.New notices appear shortly after the SEC posts them; a notice is filed on or before the sale. Latest 2026-10-06.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
- 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 2026-05-06.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 2026-10-07.JSON and CSV
- Company record
- EDGAR filing index for CIK 1555279Ticker, 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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Frequently Asked Questions
How much of MASS is sold short?
What is MASS's daily short volume?
Does MASS have fails to deliver?
Are MASS insiders buying or selling?
Have MASS insiders filed to sell?
Who owns 5% or more of MASS?
What did MASS report last quarter?
Which tracked 13F managers own MASS?
Data on this page is provided for informational purposes only and is not financial advice. See our editorial policy.