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Of the 10 tracked institutions holding MASS, 4 have a 3-year clone track record — 3 of them beat the S&P. Average holder's clone alpha: +3.7pt. It's a gauge of who owns the name, not just how many.
Among the 10 tracked institutional investors we monitor, MASS (908 Devices Inc) is held with a combined value of $51.14M across 6,461,737 shares. The largest holder is ARK Investment Management LLC with a position worth $17.64M (0.11% of their portfolio). Magnetar Financial LLC opened a new position in the most recent quarter. 5 funds increased their holdings. 4 funds reduced their position.
Total Institutional Value
$51.14M
Total Shares Held
6,461,737
Institutional Holders
10
Ranked by estimated dollars moved (share change × implied price). 13F data lags up to 45 days.
| # | Fund | Value↓ | Portfolio % | Change |
|---|---|---|---|---|
| 1 | ARK Investment Management LLC | $17.64M | 0.11% | +4.2% |
| 2 | BlackRock, Inc. | $16.91M | 0.00% | +10.0% |
| 3 | VANGUARD GROUP INC | $7.72M | 0.00% | +3.5% |
| 4 | STATE STREET CORP | $5.28M | 0.00% | -3.1% |
| 5 | RENAISSANCE TECHNOLOGIES LLC | $1.67M | 0.00% | -16.6% |
| 6 | AQR CAPITAL MANAGEMENT LLC | $904.01K | 0.00% | -0.5% |
| 7 | CITADEL ADVISORS LLC | $545.90K | 0.00% | -56.6% |
| 8 | PRICE T ROWE ASSOCIATES INC /MD/ | $178.00K | 0.00% | +5.2% |
| 9 | FMR LLC | $168.77K | 0.00% | +84.0% |
| 10 | Magnetar Financial LLC | $120.19K | 0.00% | New |
As of the latest SEC 13F filings, ARK Investment Management LLC is the largest institutional holder of MASS with a position worth $17.64M, representing 0.11% of their portfolio. In total, 10 institutional investors hold MASS with a combined value of $51.14M.
In the most recent quarter, 1 fund opened a new position in MASS. Additionally, 5 increased their holdings and 4 reduced their positions.
Institutional investors hold $51.14M worth of MASS stock across 10 positions. The largest institutional holder is ARK Investment Management LLC with $17.64M in holdings.
A 13F filing is a quarterly report required by the SEC from institutional investment managers with over $100 million in assets. It discloses their holdings in U.S. equities. For MASS, these filings reveal which major funds are accumulating or reducing positions, providing insights into institutional sentiment.
Get notified when hedge funds change their MASS positions.
Alpha = the manager's 3-year clone return minus the S&P 500. A skilled roster is a stronger tell than a crowded one — though even skilled managers' edge doesn't reliably survive the 13F disclosure lag. Why →
| 2026-08-14 |
| 13.9% | 2026-08-14 |
| 5.1% | 2026-07-27 |
SEC Schedule 13D (activist) and 13G (passive) filings for MASS. Filed when an investor acquires 5%+ ownership.
Last Close
$11.80
2026-10-21
YTD
+131.8%
87% of 52-week range
