Ranked by reported Q1 2026 13F market value
Share of total reported institutional value in MASS held by the largest 10 / 25 filers.
| # | Institution | Shares Held | Market Value | QoQ Change | Ownership % | % of Fund |
|---|---|---|---|---|---|---|
| 1 | First Light Asset Management, LLC | 6.1M | $37.2M | +25.6% | 16.059% | 3.33% |
| 2 | AWM Investment Company, Inc. | 5.2M | $31.8M | 0.0% | 13.752% | 3.52% |
| 3 | ARK Investment Management LLC | 1.9M | $11.9M | -2.0% | 5.148% | 0.09% |
| 4 | BlackRock, Inc. | 1.8M | $10.8M | -1.9% | 4.674% | 0.00% |
| 5 | NEEDHAM INVESTMENT MANAGEMENT LLC | 1.2M | $7.6M | +61.0% | 3.279% | 0.39% |
| 6 | VANGUARD CAPITAL MANAGEMENT LLC | 1.1M | $6.8M | — | 2.960% | 0.00% |
| 7 | First Eagle Investment Management, LLC | 804K | $4.9M | +28.8% | 2.125% | 0.01% |
| 8 | GEODE CAPITAL MANAGEMENT, LLC | 695K | $4.3M | +1.0% | 1.839% | 0.00% |
| 9 | GRANAHAN INVESTMENT MANAGEMENT INC/MA | 695K | $4.3M | +662.6% | 1.838% | 0.21% |
| 10 | STATE STREET CORP | 626K | $3.8M | +5.0% | 1.655% | 0.00% |
| 11 | Tao Capital Management LP | 569K | $3.5M | 0.0% | 1.505% | 2.93% |
| 12 | ESSEX INVESTMENT MANAGEMENT CO LLC | 491K | $3.0M | +1.8% | 1.299% | 0.48% |
| 13 | MORGAN STANLEY | 373K | $2.3M | -15.3% | 0.987% | 0.00% |
| 14 | Meros Investment Management, LP | 362K | $2.2M | +4.2% | 0.957% | 0.96% |
| 15 | PRESCOTT GROUP CAPITAL MANAGEMENT, L.L.C. | 362K | $2.2M | 0.0% | 0.956% | 0.22% |
| 16 | HighMark Wealth Management LLC | 319K | $2.0M | +32.5% | 0.844% | 0.80% |
| 17 | Sumitomo Mitsui Trust Holdings, Inc. | 270K | $1.7M | -6.3% | 0.714% | 0.00% |
| 18 | Nikko Asset Management Americas, Inc. | 270K | $1.7M | -6.3% | 0.714% | 0.02% |
| 19 | NORTHERN TRUST CORP | 241K | $1.5M | +4.8% | 0.638% | 0.00% |
| 20 | GM Advisory Group, Inc. | 238K | $1.5M | -14.5% | 0.630% | 0.06% |
| 21 | RENAISSANCE TECHNOLOGIES LLC | 230K | $1.4M | +3.6% | 0.609% | 0.00% |
| 22 | CHARLES SCHWAB INVESTMENT MANAGEMENT INC | 229K | $1.4M | -4.8% | 0.607% | 0.00% |
| 23 | Squarepoint Ops LLC | 213K | $1.3M | -2.5% | 0.564% | 0.00% |
| 24 | VANGUARD FIDUCIARY TRUST CO | 180K | $1.1M | — | 0.477% | 0.00% |
| 25 | RAYMOND JAMES FINANCIAL INC | 177K | $1.1M | -1.0% | 0.467% | 0.00% |
denotes a marquee investor (Buffett, Burry, ARK, Tiger Global, Pershing Square, Baupost and other widely-followed managers). “% of Fund” shows how much of that investor’s total 13F portfolio is invested in MASS — a direct measure of their conviction.
Filings activity in MASS during Q1 2026, grouped by how each filer changed its position.
8 quarters of 13F filings · Δ columns show change vs prior quarter
| Quarter | Inst. Holders | Δ Holders | Ownership % | Δ Ownership | Total 13F Value | Δ Value |
|---|---|---|---|---|---|---|
| Q1 2026 | 109 | 5.2% | 53.86% | +10.79 pp | $168M | +25% |
| Q4 2025 | 115 | +11% | 43.07% | 25.18 pp | $135M | 37% |
| Q3 2025 | 104 | +4.0% | 68.25% | +13.27 pp | $213M | +24% |
| Q2 2025 | 100 | +15% | 54.98% | +25.83 pp | $172M | +89% |
| Q1 2025 | 87 | +7.4% | 29.15% | +17.64 pp | $91M | +153% |
| Q4 2024 | 81 | 4.7% | 11.51% | 8.83 pp | $36M | 43% |
| Q3 2024 | 85 | 4.5% | 20.34% | 11.35 pp | $64M | 36% |
| Q2 2024 | 89 | — | 31.69% | — | $99M | — |
Source: SEC 13F institutional filings. Ownership % requires market cap data and will show once linked. Δ columns compare to the immediately prior filed quarter.
Quick answers to the most common questions about buying MASS stock.
Based on Q1 2026 13F filings, institutional ownership of 908 Devices Inc. stands at 53.9%, held across 109 reporting institutions.
First Light Asset Management, LLC is the largest reported institutional holder of MASS, with approximately 6,072,563 shares worth $0.04B as of Q1 2026.
Yes — 2 widely-followed marquee investors appear among the top 25 institutional holders of MASS, including ARK Investment Management LLC, RENAISSANCE TECHNOLOGIES LLC.
Our composite Smart Money Score for MASS is 58 out of 100 (Neutral). It combines net institutional buying activity, ownership shift, marquee investor presence, and holder-count growth.
12 institutions opened new positions in MASS during Q1 2026, while 18 fully exited. 75 added to existing positions and 21 trimmed.
MASS institutional ownership rose by 10.79 percentage points quarter-over-quarter, with a net change of -6 holders.
The top 10 institutions account for 73.3% of all reported 13F value in MASS, and the top 25 account for 89.7%.
All data is sourced from SEC Form 13F filings, which institutional investment managers with at least $100M in assets are required to file each quarter. We process every 13F filing from EDGAR and recompute the aggregates after each cycle. Insider transactions are sourced from Form 4 filings.
908 Devices Inc. (MASS) Institutional Ownership