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MASS · 908 Devices Inc.
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MASS 908 Devices (MASS) Insider Trading, Ownership & Congress Trades

Medical Devices · Laboratory analytical instruments · CIK 0001555279
Quote by TradingView
Form 144 · 6
Insider buyers, 180 days
0
House members buying, 1 year
0
STOCK Act, US House only, disclosed up to 45 days after the trade
Funds added, last quarter
59
13F, latest reported quarter
Conversions, 180 days
13
Codes C/M, not in net · $131.5K priced

What the filings say about MASS

Insiders, 180 days
-$9.1M net sold
5 sellers · 14% of sales under a 10b5-1 plan
Planned sales (Form 144), 90 days
$2.9M
6 notices

908 Devices insider trades (Form 4)

Form 4 buys and sells (codes P and S). Grants, option exercises and conversions excluded.

Over the last 180 days, 908 Devices Inc. insiders sold a net $9.1M of stock across 232 Form 4 purchases and sales, with no insider buying. Source: SEC Form 4 filings, as of 2026-10-27.

Insider
Filed
Shares
Value
Since filing
Brown Christopher D.
Director
SELL
2026-10-09 SECtraded 2026-10-07
30,000
$356.7K
-2.8%
Context
  • 51 earlier Form 4 trades (code P or S) here by this insider (51 sales), the last on Sep 2, 2026.
  • The trade is 4.0% of the 745,559 shares held after it.
  • 3 other insiders sold within 30 days.
  • 59 funds added in the 13F quarter to Jun 30, 2026.
Insider activity: Director Brown Christopher D. sold about $356.7K of MASS under a 10b5-1 plan on Oct 7, 2026; 3 other insiders sold within 30 days and 59 funds added in the latest 13F quarter.
Griffith Joseph H. IV
Chief Financial Officer
SELL
2026-10-08 SECtraded 2026-10-06
5,000
$65.2K
-4.6%
Context
  • 30 earlier Form 4 trades (code P or S) here by this insider (30 sales), the last on Aug 25, 2026.
  • The trade is 4.3% of the 116,497 shares held after it.
  • 3 other insiders sold within 30 days.
  • 59 funds added in the 13F quarter to Jun 30, 2026.
Insider activity: Chief Financial Officer Griffith Joseph H. IV sold about $65.2K of MASS under a 10b5-1 plan on Oct 6, 2026; 3 other insiders sold within 30 days and 59 funds added in the latest 13F quarter.
AWM Investment Company, Inc.
SELL
2026-10-01 SECtraded 2026-09-29
18,000
$207.3K
-9.5%
Context
  • 17 earlier Form 4 trades (code P or S) here by this insider (17 sales), the last on Sep 24, 2026.
  • The trade is 0.4% of the 4,736,773 shares held after it.
  • 3 other insiders sold within 30 days.
  • 59 funds added in the 13F quarter to Jun 30, 2026.
Insider activity: Insider AWM Investment Company, Inc. sold about $207.3K of MASS on Sep 29, 2026; 3 other insiders sold within 30 days and 59 funds added in the latest 13F quarter.
AWM Investment Company, Inc.
SELL
2026-09-25 SECtraded 2026-09-24
24,000
$272.6K
-1.5%
Context
  • 16 earlier Form 4 trades (code P or S) here by this insider (16 sales), the last on Sep 23, 2026.
  • The trade is 0.5% of the 4,754,773 shares held after it.
  • 3 other insiders sold within 30 days.
  • 59 funds added in the 13F quarter to Jun 30, 2026.
Insider activity: Insider AWM Investment Company, Inc. sold about $272.6K of MASS on Sep 24, 2026; 3 other insiders sold within 30 days and 59 funds added in the latest 13F quarter.
AWM Investment Company, Inc.
SELL
2026-09-25 SECtraded 2026-09-23
1,000
$11.2K
-1.5%
Context
  • 15 earlier Form 4 trades (code P or S) here by this insider (15 sales), the last on Aug 21, 2026.
  • The trade is 0.0% of the 4,755,773 shares held after it.
  • 3 other insiders sold within 30 days.
  • 59 funds added in the 13F quarter to Jun 30, 2026.
Insider activity: Insider AWM Investment Company, Inc. sold about $11.2K of MASS on Sep 23, 2026; 3 other insiders sold within 30 days and 59 funds added in the latest 13F quarter.
232 transactions on record
Since filing: total return from the first close after the filing to the latest close, dividend-adjusted. Not a forecast.
Context lines are counts over the filings above and returns from our own price history, never a price level. Not investment advice.
See all insider buying · insider selling
Showing the latest few. to see 227 more transactions and use the screener and CSV export. We store only your email; there is no password.
Seven facts, ranked against the sector · Rank is not a forecast
Insiders
net -$9.1M over 180 days
-$4.7M over 90 days · -$4.2M of it by a 10%+ holder
below 85% of Medical Devices
Congress
no House purchase disclosed in the last 12 months
Funds
59 funds bought in last quarter
below 53% of Medical Devices
Revenue
+17.7% year over year
more than 69% of Medical Devices
Margin
34.7% net margin
more than 99% of Medical Devices
Buybacks
no share repurchases reported
Short interest
9.7% of the float short (float per yahoo 2026-10-26) · 6.5 days to cover · settled 2026-09-30
more than 75% of Medical Devices
What changed in the last 30 days
Oct 9Director Brown Christopher D. sold $356.7K under a 10b5-1 plan (Oct 7)
Why it matters
A 10b5-1 plan schedules trades months ahead, so this says little about what the insider thinks today.
Oct 8Chief Financial Officer Griffith Joseph H. IV sold $65.2K under a 10b5-1 plan (Oct 6)
Why it matters
A 10b5-1 plan schedules trades months ahead, so this says little about what the insider thinks today.
Oct 6Officer Joseph Griffith filed to sell $64.0K by Oct 6 (Form 144)
Why it matters
A Form 144 is a notice of intent to sell; the sale may not happen, and it says nothing about the price.
Oct 1Insider AWM Investment Company, Inc. sold $207.3K (Sep 29)

Watch MASS

A free account keeps a watchlist and can send one email a day when insiders, funds or Congress file on the names in it. No password and no card.

The year, with the filings on it
Total return over 12 months. Each marker is a filing; hover or tap one for the detail.
+38.4%12M
-39%-8%+23%+54%2025-102025-122026-022026-042026-062026-082026-10 2026-05-28 · AWM Investment Company, Inc. sold $1.5M2026-08-11 · Knopp Kevin J. sold $1.1M2026-05-06 · AWM Investment Company, Inc. sold $462.4K2026-08-21 · AWM Investment Company, Inc. sold $441.2K2026-08-04 · AWM Investment Company, Inc. sold $417.8K2026-06-24 · Knopp Kevin J. sold $370.5K2026-06-04 · AWM Investment Company, Inc. sold $356.8K2026-10-07 · Brown Christopher D. sold $356.7K2026-09-02 · Brown Christopher D. sold $317.4K2026-08-11 · Knopp Kevin J. sold $306.5K2026-09-24 · AWM Investment Company, Inc. sold $272.6K2026-05-28 · Brown Christopher D. sold $270.0K2026-09-16 · Kenneweg John sold $216.3K2026-02-02 · Knopp Kevin J. sold $214.8K2026-09-29 · AWM Investment Company, Inc. sold $207.3K2026-08-17 · Knopp Kevin J. sold $207.0K2026-06-30 · Brown Christopher D. sold $176.8K2026-06-03 · Brown Christopher D. sold $174.6K2026-08-05 · Brown Christopher D. sold $169.8K2026-06-25 · Knopp Kevin J. sold $149.1K2026-05-08 · Kenneweg John sold $148.0K2026-05-06 · Brown Christopher D. sold $144.6K2026-02-02 · Griffith Joseph H. IV sold $143.2K2026-04-08 · McCallion Kevin J. sold $131.0K2026-08-25 · Griffith Joseph H. IV sold $125.5K2026-04-10 · Brown Christopher D. sold $124.3K2026-05-27 · AWM Investment Company, Inc. sold $123.8K2026-04-08 · Brown Christopher D. sold $106.0K2026-05-07 · AWM Investment Company, Inc. sold $105.1K2026-06-23 · Brown Christopher D. sold $89.5K2026-08-20 · AWM Investment Company, Inc. sold $88.6K2026-08-10 · Brown Christopher D. sold $85.3K2026-08-11 · Brown Christopher D. sold $77.1K2026-08-13 · Knopp Kevin J. sold $76.7K2026-10-06 · Griffith Joseph H. IV sold $65.2K2026-05-28 · Griffith Joseph H. IV sold $62.7K2026-09-17 · Kenneweg John sold $53.7K2026-05-01 · Kenneweg John sold $53.2K2026-04-09 · Brown Christopher D. sold $52.0K2026-06-22 · AWM Investment Company, Inc. sold $42.0K2026-05-11 · AWM Investment Company, Inc. sold $41.2K2026-05-06 · AWM Investment Company, Inc. sold $40.0K2026-10-06 · Joseph Griffith filed to sell $64.0K2026-09-15 · John Kenneweg filed to sell $269.1K2026-08-25 · Joseph Griffith filed to sell $125.1K2026-08-17 · Kevin Knopp filed to sell $205.0K2026-08-11 · Kevin Knopp filed to sell $1.3M2026-08-10 · CHRISTOPHER BROWN filed to sell $888.0K2026-06-23 · Kevin Knopp filed to sell $724.0K
Insider sellForm 144 (planned sale)
Indexed to 100, dividend-adjusted, not a price chart. When a name files heavily, the largest trades are drawn first.

Who owns MASS: institutional holders (13F)

13F holdings, latest reported quarter
First Light Asset Management, LLC
6,282,804 sh
$54.7M
AWM Investment Company, Inc.
4,879,773 sh
$42.5M
ARK Investment Management LLC
2,027,920 sh
$17.6M
BlackRock, Inc.
1,944,236 sh
$16.9M
First Eagle Investment Management, LLC
1,859,970 sh
$16.2M

Congress trades in MASS

No Congress trades reported
No House member has disclosed a trade in this stock. See what Congress is buying.

Activist and 5% holders (13D/13G)

No 5%+ ownership filings
Nobody has filed for crossing 5%. That is a fact, not missing data.

MASS planned insider sales (Form 144)

Notice of intent to sell, filed before any sale
Joseph Griffith
Filed 2026-10-06
$64.0K
John Kenneweg
Filed 2026-09-15
$269.1K
Joseph Griffith
Filed 2026-08-25
$125.1K
Kevin Knopp
Filed 2026-08-17
$205.0K
Kevin Knopp
Filed 2026-08-11
$1.3M

MASS mutual fund holders (N-PORT)

Funds ranked by the share of their own portfolio in this stock (N-PORT).
ARK Genomic Revolution ETF
$15.3M position · as of 2026-07-31
1.0%
1290 Essex Small Cap Growth Fund
$909.5K position · as of 2026-07-31
0.8%
ACUITAS US MICROCAP FUND
$878.3K position · as of 2026-06-30
0.7%
Needham Small Cap Growth Fund
$2.2M position · as of 2026-06-30
0.5%
State Street(R) SPDR(R) S&P Kensho Future Security ETF
$742.2K position · as of 2026-06-30
0.5%
Needham Aggressive Growth Fund
$12.2M position · as of 2026-06-30
0.5%
SEC N-PORT, monthly, about 60 days late · funds ≥ $10M · % is the share of the fund's own portfolio
Live price
Daily candles from TradingView, under their licence. No filings marked.
Why this name is on the desk
Insiders have filed to sell, before selling.
The record shows a net $9.1M sold by insiders over 180 days, 59 funds added last quarter, $2.9M in planned Form 144 sales. Each figure is a federal filing, dated the day it went public.
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Same sector, ranked by filing activity
Sector by SEC SIC code
PENBLFSMTDSIBNWRBYISRGTXGDXCMEWTMDXOMIRMD

MASS financials

Revenue growth
+17.7%
XBRL, annual
Net margin
34.7%
Ratios from the company's XBRL filings, latest filings
Revenue, TTM
$60.8M
four quarters, 2025-07-01 to 2026-06-30
Net margin, TTM
-57.0%
net income over revenue, 2025-07-01 to 2026-06-30
Free cash flow, TTM
$615.0K
operating cash flow minus capex, 2025-07-01 to 2026-06-30
Debt to equity
0.12x
long-term 2022-12-31 (42 months older than the period end) plus current 2021-03-31 (63 months older than the period end); equity 2026-06-30
Cash flow to debt
0.10x
TTM operating cash flow over long-term 2022-12-31 (42 months older than the period end) plus current 2021-03-31 (63 months older than the period end)
Return on equity
-25.2%
TTM net income over average of 2025-06-30 and 2026-06-30
Return on assets
-17.8%
TTM net income over average of 2025-06-30 and 2026-06-30
Return on invested capital
n/a
tax provision or pre-tax income not filed for the four quarters
Return on capital employed
-25.1%
operating income (EBIT proxy) over average of 2025-06-30 and 2026-06-30 minus current liabilities
P/E, trailing
n/a
trailing loss, a multiple of a loss is not meaningful
Enterprise value
$426.9M
market value at close 2026-10-23 on 2026-08-07 shares, plus long-term 2022-12-31 (42 months older than the period end) plus current 2021-03-31 (63 months older than the period end), minus cash 2026-06-30
FCF yield
+0.1%
TTM free cash flow over market value at close 2026-10-23
PEG, trailing
n/a
trailing loss, a multiple of a loss is not meaningful
Price as of 2026-10-23. Hover or tap a tile for its yearly and quarterly history.
Method
TTM is four consecutive fiscal quarters; Q4 is the year minus nine months when not filed. Returns use the average of opening and closing balances. EBIT is approximated by operating income. PEG uses trailing EPS growth.
Fundamentals
Annual figures from XBRL filings. Pick a past date to see them as known then.
2025-122024-122023-122022-12
Revenue$56.2M$59.6M$50.2M$46.9M
Gross profit$28.4M$24.5M$25.3M$26.0M
Operating income-$39.4M-$57.4M-$42.8M-$35.4M
Net income$19.5M-$72.2M-$36.4M-$33.6M
EPS (diluted)0.54-2.12-1.13-1.07
Operating cash flow-$23.7M-$30.2M-$25.1M-$20.9M
Cash$70.5M$44.0M$121.0M$188.4M
Long-term debtn/an/an/a$15.0M
SEC XBRL, fiscal years, as known on 2026-10-27

MASS Stock Sonar score 6/7 axes

Find similar shapesCompare

MASS ranks highest on growth (71st percentile) and financial health (63rd), and lowest on insider conviction (7th), among Medical Devices peers.

ProfitHealthGrowthInsidersInstitutionsRisk
Profitability
47
Inputs
  • Return on equity-25.2% · 49 pct, sector of 183
  • Return on assets-17.8% · 47 pct, sector of 214
  • Return on invested capitaltax provision or pre-tax income not filed for the four quarters
  • Return on capital employed-25.1% · 44 pct, sector of 188
Financial health
63
Inputs
  • Debt to equity0.12x · 66 pct, sector of 159
  • Cash flow to debt0.10x · 60 pct, sector of 150
Growth
71
Inputs
  • Revenue growth, YoY+17.7% · 69 pct, sector of 219
  • Backlog growth, YoY+20.6% · 72 pct, sector of 37
Insider conviction
7
Inputs
  • Net Form 4 buying (codes P and S), 180d-$8.0M · 14 pct, sector of 140
  • Insider buyers, 180d0 · 0 pct, sector of 142
Institutional and government
54
Inputs
  • Funds adding, latest quarter59 · 47 pct, sector of 191
  • Congress net buyers, 365dno Congress trades in 365 days
  • Federal contracts, 180dno federal contracts in 180 days
  • Lobbying spend, 4 quarters$290K · 61 pct, sector of 50
Risk and compliance
47
Inputs
  • Short interest, % of float+9.7% · 23 pct, sector of 240
  • Recalls per $1B revenue, 3y0.00 per $1B · 100 pct, sector of 116
  • EPA cases per $1B revenue, 5ynot measured for this sector, almost no peer has an event
  • New text in Risk Factors, latest 10-K+20.4% · 17 pct, sector of 198
1 not measured: US patents
  • US patents needs 1 of 2 inputs, 0 present: patent data not loaded yet

6 of 7 axes scored. Each is a percentile against sector peers (all companies when the sector is thin); higher is better. An unscored axis is unmeasured, not low. How it is scored

MASS filings, in plain words

Are 908 Devices insiders buying or selling MASS?

In the 180 days to 2026-10-27, 908 Devices insiders were net sellers, a net $9.1M across purchases and sales reported on Form 4, by 5 sellers.

Are there planned insider sales of MASS?

Yes. 6 Form 144 notices of planned insider sales were filed in the 90 days to 2026-10-27, covering $2.9M of stock; the latest, by Joseph Griffith, was filed 2026-10-06.

Read the full summary

In the 180 days to 2026-10-27, 908 Devices insiders were net sellers of MASS, a net $9.1M across purchases and sales reported on Form 4 by 5 sellers. 14% of the 49 insider sales were made under a Rule 10b5-1 plan; the rest were not flagged as planned. Insiders filed 6 Form 144 notices of intent to sell in the 90 days to 2026-10-27, covering $2.9M of stock. Each figure is counted from SEC and House filings as of 2026-10-27, dated the day the filing was made public.

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