Institutional ownership · Form 13F
MASS institutional ownership
908 Devices Inc. - Common Stock: reported institutional holdings as of 2026-06-30 (filed through 2026-08-31), aggregated by StockEyes from SEC Form 13F information tables. MASS is one of 2732 tickers in the validated publication set. Mapping coverage in this publication set: 4562 of 6046 universe tickers have at least one validated CUSIP mapping (75.5%). Latest-quarter filed value resolved to any listed ticker: 77.3%; resolved to this universe: 77.2%.
MASS: change since the prior quarter's filings
The reporting-manager count held at 112 in both the quarter ended 2026-03-31 and the quarter ended 2026-06-30. Total reported shares rose to 29,000,486 (+1,053,112, 3.8%), with the manager count unchanged. Among the 25 managers listed as top holders in both quarters, the largest increases were First Eagle Investment Management, LLC (+1,056,364 shares) and NEEDHAM INVESTMENT MANAGEMENT LLC (+580,620 shares), among 15 managers who added shares, and the largest decreases were AWM Investment Company, Inc. (-320,151 shares) and Sumitomo Mitsui Trust Group, Inc. (-41,192 shares), among 9 managers who reduced shares. AMERICAN CENTURY COMPANIES INC (359,848 shares), BANK OF AMERICA CORP /DE/ (251,027 shares) and 3 more entered the listed top holders; Tao Capital Management LP (568,981 shares in the prior quarter), GM Advisory Group, LLC (238,218 shares in the prior quarter) and 3 more dropped out of the listed top holders.
New to 13F data? Read how to read a 13F filing, or see where institutions moved overall in the Smart Money Report.
Reported totals, quarter ended 2026-06-30
112 reporting managers held 29,000,486 shares, reported value $250,978,978 exactly as filed. Values are position values transcribed from the filings, not current market prices.
Reported quarter-over-quarter change (quarter ended 2026-03-31 to quarter ended 2026-06-30): reporting managers 0, reported shares +1,053,112 (+3.77%), reported value +48.20%. These changes compare two filing snapshots.
Shares outstanding check: 37,727,668 shares reported by the issuer (SEC XBRL, period ended 2026-06-30). Reported 13F shares equal 76.9% of that figure. This page passed the publication sanity gate before listing.
MASS in this quarter's filings
Concentration check: the largest reported position, First Light Asset Management, LLC with 6,282,804 shares, is 21.7% of all shares reported for MASS this quarter. The five largest reporting managers together account for 58.6% of the reported total, so the headline total is dominated by a handful of large managers.
Reported quarter-over-quarter change: the reporting-manager count was unchanged by 0 versus the quarter ended 2026-03-31, and reported shares moved +3.77% (+1,053,112 shares). That is a comparison of two filing snapshots, not a record of trades on any single day.
Shares-outstanding cross-check: reported 13F shares equal 76.9% of the issuer share count used at the publication gate (37,727,668 shares, issuer period ended 2026-06-30). The gate publishes a ticker only when that relationship is plausible; lending chains can push reported totals above a simple ownership share, which is why the figure is a sanity check and not an ownership percentage.
Largest reporting managers, MASS
| # | Manager | Shares | Value as filed | Share of reported total |
|---|---|---|---|---|
| 1 | First Light Asset Management, LLC | 6,282,804 | $54,660,395 | 21.7% |
| 2 | AWM Investment Company, Inc. | 4,879,773 | $42,454,025 | 16.8% |
| 3 | ARK Investment Management LLC | 2,027,920 | $17,642,905 | 7.0% |
| 4 | BlackRock, Inc. | 1,944,236 | $16,914,853 | 6.7% |
| 5 | First Eagle Investment Management, LLC | 1,859,970 | $16,181,740 | 6.4% |
| 6 | NEEDHAM INVESTMENT MANAGEMENT LLC | 1,820,620 | $15,839,394 | 6.3% |
| 7 | VANGUARD CAPITAL MANAGEMENT LLC | 1,291,570 | $11,236,659 | 4.5% |
| 8 | GEODE CAPITAL MANAGEMENT, LLC | 761,797 | $6,629,605 | 2.6% |
| 9 | Granahan Investment Management, LLC | 692,092 | $6,021,200 | 2.4% |
| 10 | STATE STREET CORP | 606,560 | $5,277,072 | 2.1% |
| 11 | ESSEX INVESTMENT MANAGEMENT CO LLC | 470,244 | $4,091,123 | 1.6% |
| 12 | MORGAN STANLEY | 404,078 | $3,515,486 | 1.4% |
| 13 | Prescott Group Capital Management, L.L.C. | 361,595 | $3,145,876 | 1.2% |
| 14 | Meros Investment Management, LP | 361,368 | $3,143,902 | 1.2% |
| 15 | AMERICAN CENTURY COMPANIES INC | 359,848 | $3,130,678 | 1.2% |
Manager names and figures are transcribed from each manager's own Form 13F information table. A manager listing shares in this snapshot does not mean it holds them today.
Reported change, 2026-03-31 to 2026-06-30
| Quarter ended | Filed through | Reporting managers | Reported shares | Value as filed |
|---|---|---|---|---|
| 2026-03-31 | 2026-05-29 | 112 | 27,947,374 | $169,351,042 |
| 2026-06-30 | 2026-08-31 | 112 | 29,000,486 | $250,978,978 |
Every change figure on this page is a reported quarter-over-quarter change between filing snapshots. It is not real-time trading activity.
MASS reported totals over time
Quarter ended 2026-06-30: 112 reporting managers · 29,000,486 reported shares · $250,978,978 value as filed.
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Quarter-end 13F filed data, long positions only; filings arrive up to 45 days after quarter end.
CUSIPs behind the MASS total
The validated bridge mapped 1 current CUSIP(s) to MASS for this quarter: 65443P102. Option pseudo-CUSIPs, units, warrants, and preferred classes are excluded from these common-share totals. Mapping coverage in this publication set: 4562 of 6046 universe tickers have at least one validated CUSIP mapping (75.5%). Latest-quarter filed value resolved to any listed ticker: 77.3%; resolved to this universe: 77.2%.
What this page is and is not
Form 13F reports are quarterly holdings snapshots. Managers file up to about 45 days after quarter-end, so these figures describe reported positions as of the quarter-end date, not holdings today. 13F lists reportable long positions from managers above the SEC reporting threshold and omits short positions entirely.
This page is informational only. It is not investment advice, a recommendation, or a signal to buy or sell. Source: SEC Form 13F bulk data set for filings through 2026-08-31 (period ended 2026-06-30), joined to tickers through StockEyes' validated CUSIP bridge. Methodology and coverage are documented on the institutional ownership hub.
Insider transactions for MASS (officer and director buys and sells) are covered by InsiderTrace: insidertrace.com/stock/mass. StockEyes does not duplicate insider transaction tables.
Related StockEyes pages
Latest headlines tagged MASS are on the market news wire. Upcoming earnings and market dates are on the events calendar. The term itself is defined in the institutional investor glossary entry, and the research workflow behind pages like this one is walked through in how to research a stock and how to compare SEC filings.