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MASS · NASDAQ
$11.51+$0.08 (+0.70%)TodayMarket closed ·
Prev close $11.43
Who owns MASS
Largest institutional holders, from their latest 13F filings
The 10 largest institutions hold 64.8% of MASS’s shares.
- First Light Asset Management, LLC15.3%
- ARCH Venture Partners14.0%
- AWM Investment Company, Inc.11.8%
- ARK Investment Management LLC4.9%
- Next 6 largest institutions18.8%
- All other shareholders35.2%
| Holder | Shares | % of shares |
|---|---|---|
| First Light Asset Management, LLC | 6.28M | 15.31% |
| ARCH Venture Partners | 5.73M | 13.95% |
| AWM Investment Company, Inc. | 4.83M | 11.77% |
| ARK Investment Management LLC | 2.03M | 4.94% |
| Needham Investment Management L.L.C. | 1.82M | 4.44% |
| BlackRock Institutional Trust Company, N.A. | 1.79M | 4.36% |
| Vanguard Capital Management, LLC | 1.29M | 3.15% |
| Knopp (Kevin J) | 1.10M | 2.67% |
| First Eagle Investment Management, L.L.C. | 929.99K | 2.27% |
| Brown (Christopher D) | 805.56K | 1.96% |
Largest mutual fund holders
| Holder | Shares | % of shares |
|---|---|---|
| ARK Genomic Revolution ETF | 2.01M | 4.91% |
| Needham Aggressive Growth Fund | 1.40M | 3.41% |
| Vanguard Total Stock Market Index Fund | 919.83K | 2.24% |
| First Eagle Small Cap Opportunity Fund | 814.51K | 1.99% |
| iShares Russell 2000 ETF | 753.96K | 1.84% |
Insider trades
Form 4 filings by officers, directors and large holders
Over the last 6 months, insiders sold $9.10M (48 trades) of MASS on the open market, with no buys.
| Insider | Type | Shares | Value |
|---|---|---|---|
| Brown Christopher D. | Option exercise | 60.00K | — |
| Brown Christopher D. | Option exercise | 60.00K | $105.00K |
| Brown Christopher D. | Sale | 30.00K | $356.70K |
| Griffith Joseph H. IV | Sale | 5.00K | $65.15K |
| AWM Investment Company, Inc. | Sale | 18.00K | $207.32K |
| AWM Investment Company, Inc. | Sale | 24.00K | $272.63K |
| AWM Investment Company, Inc. | Sale | 1.00K | $11.25K |
| Kenneweg John | Option exercise | 5.26K | — |
| Kenneweg John | Sale | 5.26K | $53.73K |
| Kenneweg John | Option exercise | 5.26K | $5.05K |
Short interest
Settled Sep 30, 2026
- Shares short
- 2.73M
- Days to cover
- 6.47
- % of shares outstanding
- 6.65%
- Average daily volume
- 421.86K
- Change since last report
- −0.7%
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