InvestorLens

MASS — 908 DEVICES INC

Public company

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For educational research only.InvestorLens analyzes public regulatory filings (SEC EDGAR, STOCK Act PTRs) that may be delayed by 45 days or more. Information shown is historical and is not financial, legal, or tax advice, nor a recommendation or solicitation to buy or sell any security. Always do your own research.

InvestorLens aggregates public filing data to show which tracked investors reported holdings in this stock. Dollar values represent reported position values, not market capitalization, and may be delayed up to 45 days. Not a recommendation.

Sourced from SEC EDGAR public filings

Why are billionaires buying MASS?

Built from public SEC filings and public economic data. Not a recommendation.

Confidence
67
Institutional Conviction
Strong distribution · 1 buying vs 2 selling last quarter
22
Macro Tailwind
Macro conditions are mixed for this sector
56
Why? — Evidence & Confidence ▾

Of 3 tracked investors who changed their MASS position last quarter, 1 bought and 2 sold (33% buy-side). Macro conditions are mixed for this sector (Macro Tailwind 56/100 in a Overheat regime).

Supporting evidence
  • +1 tracked investor added or increased positions last quarter (Cathie Wood)
  • +2 tracked investors reported holding MASS at their latest filing
  • +Macro Health is 56/100 in a Overheat regime — historically acceptable for this sectorsource
Contradicting evidence — always shown
  • −2 tracked investors reduced or exited last quarter (1 reduced, 1 sold out)
  • −13F data is disclosed up to 45 days after quarter end — positions may have changed since
Know the limits
  • · 13F disclosure lag (up to 45 days)
  • · Tracked investors are a sample, not the whole market
  • · Sector regime fit is a historical average, not a guarantee

Every InvestorLens score shows its evidence — including what argues against it. Model conviction-v1 · generated 9/18/2026.

About 908 DEVICES INC (MASS)

908 DEVICES INC (MASS) appears in the most recent 13F filings of 2 tracked institutional investors. The largest disclosed position is held by Cathie Wood (ARK Investment Management), valued at $49M. Across recent filings, tracked investors recorded 5 new positions, 8 increased, 12 reduced, and 3 exited. All data sourced from SEC 13F filings.

Smart Money Consensus™

Based on recent institutional activity in MASS

46
/100
Mixed Activity
Added / Increased13
Reduced12
Exited3
BearishBullish
Crowded Trade Score™

How many top investors track MASS

13
/100
Undiscovered
2investors

Only 2 tracked investors report this position.

UndiscoveredCrowded
151015+

MASS Ownership Composition

How 908 DEVICES INC is held across tracked investor types, based on reported 13F positions.

Dominant Type
Growth & Innovation
97% of tracked value
Institutions
2
tracked investors
Total Reported
$18.2M
combined 13F value
Types2
  • Growth & Innovation97.0%
  • Multi-Strategy / Quant3.0%
Growth & Innovation(1)
97.0%
Multi-Strategy / Quant(1)
3.0%

Tracked investors currently reporting MASS

2 tracked investors have since exited this position — listed separately below.

  • Cathie WoodJun 30, 2026
    ARK Investment Management
    Shares
    2M
    Value
    $17.6M
    % Portfolio
    0.11%
  • Ken GriffinJun 30, 2026
    Citadel Advisors
    Shares
    62.7K
    Value
    $545.9K
    % Portfolio
    0.00%

Previously held MASS

These investors reported MASS in an earlier quarter but not in their most recent 13F. Figures below are their last reported position, not a current holding.

InvestorFirmLast reported sharesValue thenLast held
Izzy EnglanderMillennium Management142.4K$871.6KMar 31, 2026
Steve CohenPoint72 Asset Management55.9K$293.7KDec 31, 2025

Recent activity

Frequently asked questions

How many institutional investors hold MASS?
2 tracked institutional investors disclosed a position in MASS (908 DEVICES INC) in their most recent 13F filing.
Who is the largest institutional holder of MASS?
Cathie Wood, ARK Investment Management, holds the largest disclosed position in MASS, valued at $49M.
Did institutional ownership of MASS increase or decrease?
Across recent 13F filings, tracked investors recorded 5 new positions, 8 increased, 12 reduced, and 3 fully exited MASS.
Where does this MASS ownership data come from?
SEC Form 13F-HR filings, accessed via EDGAR. 13F filings are disclosed quarterly with a 45-day reporting delay and cover U.S.-listed long equity positions only. This is not investment advice.