MASS · 908 Devices Inc. · Holdings
Institutional ownership from SEC Form 13F filings. Investment managers with more than $100 million in U.S. equities must disclose their positions every quarter, within 45 days of quarter-end, so the holdings shown can lag the market by up to a quarter.
Institutional Ownership Trend
Holder Concentration
Across 111 13F filersWho Holds MASS
Last 8 quarters through Sep 30, 2026 (filing window open)Each kind of 13F filer's share of the common shares 13F filers report. Holder type comes from regulatory records, never the filer's name; style, turnover and horizon are measured from each filer's own 13F book. The quarter selector does not change this card.
Jun 30, 2026, the newest closed quarter: 111 filers, like-for-like change +1.5%; actively managed books -0.1%; index-like books +7.2%.
| Holder type | Share | Filers | Change |
|---|---|---|---|
| Registered adviser | 78.7% | 57 | +1.1% |
| Exempt adviser | 0.4% | 2 | +33.0% |
| Adviser | 0.1% | 2 | +6.8% |
| Bank | 5.9% | 13 | +15.3% |
| Broker-dealer | 0.2% | 1 | -18.4% |
| Benefit plan | 0.1% | 2 | -0.4% |
| Non-US | 0.1% | 3 | +34.5% |
| Holding company | 8.7% | 5 | +8.0% |
| Insurer | 0.0% | 0 | — |
| Unknown | 5.8% | 26 | -13.7% |
| Style | Share | Filers | Change |
|---|---|---|---|
| Index-like | 22.0% | 21 | +7.2% |
| Systematic-like | 1.5% | 12 | -58.1% |
| Concentrated | 22.8% | 11 | -6.1% |
| Diversified active | 53.8% | 67 | +6.8% |
| Not measured | 0.0% | 0 | — |
| Unknown | 0.0% | 0 | — |
| Turnover | Share | Filers | Change |
|---|---|---|---|
| Low turnover | 35.3% | 61 | +5.0% |
| Medium turnover | 56.6% | 24 | +1.9% |
| High turnover | 1.6% | 18 | -55.2% |
| Unknown | 6.5% | 8 | +12.3% |
| Not measured | 0.0% | 0 | — |
| Holding horizon | Share | Filers | Change |
|---|---|---|---|
| Short horizon | 7.1% | 13 | +2.3% |
| Medium horizon | 9.6% | 15 | +6.5% |
| Long horizon | 56.0% | 73 | +3.9% |
| Unknown | 27.2% | 10 | -4.9% |
| Not measured | 0.0% | 0 | — |
| 13F book size | Share | Filers | Change |
|---|---|---|---|
| Under $1B | 5.1% | 18 | -2.0% |
| $1B to $10B | 52.8% | 27 | -2.0% |
| $10B to $100B | 12.2% | 21 | +0.6% |
| $100B or more | 29.9% | 45 | +9.3% |
| Not measured | 0.0% | 0 | — |
| Client base | Share | Filers | Change |
|---|---|---|---|
| Individuals and high net worth | 1.6% | 17 | -12.0% |
| Pooled investment vehicles | 43.4% | 15 | -6.1% |
| Registered funds and BDCs | 26.6% | 10 | +16.7% |
| Pension and profit sharing plans | 1.3% | 2 | -0.1% |
| Insurance companies | 0.1% | 2 | +1.4% |
| Governments and sovereign funds | 0.7% | 2 | -25.4% |
| Other investment advisers | 0.0% | 2 | +2046.2% |
| Diversified | 5.1% | 7 | +4.7% |
| Other | 0.0% | 0 | — |
| Unknown | 21.3% | 54 | +3.0% |
| Private funds | Share | Filers | Change |
|---|---|---|---|
| Hedge funds | 57.1% | 17 | -0.4% |
| Private equity funds | 0.1% | 2 | -1.3% |
| Real estate funds | 0.1% | 3 | +2.3% |
| Securitized asset funds | 0.0% | 1 | 0.0% |
| Other private funds | 5.4% | 8 | +8.3% |
| Mixed private funds | 0.1% | 1 | +19.3% |
| Private funds, type not stated | 1.3% | 2 | +2.9% |
| No private funds | 15.1% | 25 | +4.9% |
| Unknown | 20.9% | 52 | +2.5% |
| Location | Share | Filers | Change |
|---|---|---|---|
| United States | 97.4% | 95 | +2.6% |
| Outside the US | 2.6% | 16 | -28.6% |
The Sep 30, 2026 filing window is still open, so its bar carries the Jun 30, 2026 positions of filers that have not filed yet.
How the mix is measured
Shares are 13F common shares restated to today's split basis; options and principal amounts are left out. The change compares only filers with a 13F in both quarters and keeps each filer in its bucket of the later quarter on both sides; a filer that continues under a new CIK is compared through its successor. Holder type comes from each filer's current regulatory profile; client base and private funds come from the Form ADV roster current at each quarter end (rosters from December 2019, so an earlier quarter reads Unknown). Style, turnover, horizon and book size are measured from each filer's 13F book in the newest measured quarter, and Not measured means none was. Actively managed books are those measured systematic-like, concentrated or diversified active.
Excluded 1 holder with no observed 2026-03-31 13F and 4 holders with no observed 2026-06-30 13F.
Conviction and Crowding
111 13F filers, quarter ended Jun 30, 2026Measured across every 13F filer's common-share book once the quarter's filing window closed. Crowding counts filers with high turnover or that advise private funds on Form ADV.
Managers in the top fifth by current three-year FundScore alpha were net buyers of $0 (0 buying, 0 selling).
Estimated Holder Cost Basis
Quarter ended Jun 30, 2026, on that quarter's share basisEstimated, never filed: each 13F buy is costed at its quarter's average traded price and each sale keeps the average cost, so this is what holders paid on average if they traded evenly through each quarter.
Estimated cost covers 74.5% of the 13F shares; positions already held when a filer's 13F history starts, or bought in a quarter without a trusted average price, have no estimate.
Shared Holders
Companies MASS's active holders also own, quarter ended Jun 30, 2026| # | Company | Shared holders |
|---|---|---|
| 1 | LTRX Lantronix Inc | 4 |
| 2 | NPCE NeuroPace Inc | 3 |
| 3 | SIBN SI-BONE, Inc. | 4 |
| 4 | KRMD KORU Medical Systems, Inc. | 3 |
| 5 | SDGR Schrodinger, Inc. | 3 |
| 6 | ATRC AtriCure, Inc. | 3 |
| 7 | PSNL Personalis, Inc. | 3 |
| 8 | CYRX Cryoport, Inc. | 3 |
| 9 | BFLY Butterfly Network, Inc. | 3 |
| 10 | LPTH Lightpath Technologies Inc | 3 |
Shareholder Targets
13F filers that own its peers but not MASS, quarter ended Jun 30, 2026Found through its holder-overlap peers: LTRX, NPCE, SIBN, KRMD, SDGR, ATRC, PSNL, CYRX, BFLY, LPTH, CRNX, WTTR, TWST, VICR, CECO, KTOS, AVAV, GH, TOST, BWXT. 1,868 filers in all.
| # | Filer | In peers | Largest peers |
|---|---|---|---|
| 1 | Capital International Investors Adviser, Diversified active | $1,254,070,126 2 held | TOST, GH |
| 2 | FRANKLIN RESOURCES INC Adviser, Diversified active | $1,161,613,252 15 held | GH, BWXT, WTTR |
| 3 | Artisan Partners Limited Partnership Registered adviser, Diversified active | $1,039,816,169 4 held | TWST, GH, BWXT |
| 4 | Driehaus Capital Management LLC Registered adviser, Diversified active | $1,002,322,806 9 held | CRNX, GH, VICR |
| 5 | FIRST TRUST ADVISORS LP Registered adviser, Diversified active | $873,802,712 11 held | BWXT, KTOS, VICR |
| 6 | WELLINGTON MANAGEMENT GROUP LLP Holding company, Diversified active | $813,638,736 11 held | CRNX, KTOS, ATRC |
| 7 | TWO SIGMA INVESTMENTS, LP Registered adviser, Systematic-like | $784,389,256 19 held | GH, CECO, KTOS |
| 8 | AMERIPRISE FINANCIAL INC Adviser, Diversified active | $749,289,837 14 held | GH, PSNL, TWST |
| 9 | Hood River Capital Management LLC Registered adviser, Diversified active | $745,778,363 7 held | GH, KTOS, BFLY |
| 10 | T. Rowe Price Investment Management, Inc. Adviser, Diversified active | $669,734,681 8 held | BWXT, CECO, CRNX |
Fund Ownership of MASS by Fund Type
Registered funds' Form N-PORT reports for the quarter ended Jun 30, 2026Index funds and index ETFs hold 9.28% of shares outstanding.
| Fund type | Of shares outstanding | Shares |
|---|---|---|
| Index funds | 2.50% | 1,034,843 |
| Index ETFs | 6.78% | 2,801,814 |
| Active ETFs | 4.79% | 1,980,962 |
| Active funds | 7.49% | 3,095,667 |
| Unclassified | 0.36% | 146,744 |
| All registered funds | 21.92% | 9,060,030 |
How fund types are measured
Each fund series counts once, with its latest Form N-PORT report dated inside the quarter; only long share positions count, restated to today's split basis. The fund type is the series' latest Form N-CEN answer on or before the quarter end (the index-fund box and the exchange-traded flag), never its name. Unclassified funds have no usable N-CEN; unit investment trusts are among them, so index ownership is a floor. Funds sit inside their advisers' 13F reports, so these shares overlap the 13F figures and are never added to them.
| Holder | Value (USD) | % of 13F | Shares | Type | Filed | Open |
|---|---|---|---|---|---|---|
| Mid First Light Asset Management, LLC Registered adviser | $54,660,394 | 22.16% | 6,282,804 | Shares | 2026-08-14 | |
| Mid AWM Investment Company, Inc. Registered adviser | $42,454,025 | 17.21% | 4,879,773 | Shares | 2026-08-14 | |
| Large ARK Investment Management LLC Registered adviser | $17,642,904 | 7.15% | 2,027,920 | Shares | 2026-08-14 | |
| Mega BlackRock, Inc. Holding company | $16,914,850 | 6.86% | 1,944,236 | Shares | 2026-08-07 | |
| Mid NEEDHAM INVESTMENT MANAGEMENT LLC Registered adviser | $15,839,394 | 6.42% | 1,820,620 | Shares | 2026-08-14 | |
| Mega VANGUARD CAPITAL MANAGEMENT LLC Registered adviser | $11,236,659 | 4.56% | 1,291,570 | Shares | 2026-08-13 | |
| Large First Eagle Investment Management, LLC Registered adviser | $8,090,869 | 3.28% | 929,985 | Shares | 2026-08-24 | |
| Mega GEODE CAPITAL MANAGEMENT, LLC Registered adviser | $6,627,633 | 2.69% | 761,797 | Shares | 2026-08-12 | |
| Mid Granahan Investment Management, LLC Registered adviser | $6,021,200 | 2.44% | 692,092 | Shares | 2026-08-14 | |
| Small ESSEX INVESTMENT MANAGEMENT CO LLC Registered adviser | $5,623,412 | 2.28% | 455,706 | Shares | 2026-10-19 | |
| Mega STATE STREET CORP Bank | $5,277,072 | 2.14% | 606,560 | Shares | 2026-09-22 | |
| Mega MORGAN STANLEY Holding company | $3,515,476 | 1.43% | 404,078 | Shares | 2026-08-13 | |
| Mid Prescott Group Capital Management, L.L.C. Registered adviser | $3,145,876 | 1.28% | 361,595 | Shares | 2026-08-07 | |
| Small Meros Investment Management, LP Registered adviser | $3,143,901 | 1.27% | 361,368 | Shares | 2026-08-14 | |
| Mega AMERICAN CENTURY COMPANIES INC | $3,130,677 | 1.27% | 359,848 | Shares | 2026-08-12 | |
| Small HighMark Wealth Management LLC Registered adviser | $2,956,112 | 1.20% | 339,783 | Shares | 2026-08-12 | |
| Mega NORTHERN TRUST CORP Bank | $2,317,827 | 0.94% | 266,417 | Shares | 2026-08-13 | |
| Mega BANK OF AMERICA CORP /DE/ Bank | $2,183,934 | 0.89% | 251,027 | Shares | 2026-08-14 | |
| Mega CHARLES SCHWAB INVESTMENT MANAGEMENT INC Registered adviser | $2,034,860 | 0.82% | 233,892 | Shares | 2026-08-14 | |
| Mega Sumitomo Mitsui Trust Group, Inc. Bank | $1,989,524 | 0.81% | 228,681 | Shares | 2026-07-30 | |
| Mid Amova Asset Management Americas, Inc. Registered adviser | $1,989,524 | 0.81% | 228,681 | Shares | 2026-08-13 | |
| Mega VANGUARD PORTFOLIO MANAGEMENT LLC Registered adviser | $1,695,264 | 0.69% | 194,858 | Shares | 2026-08-13 | |
| Large RENAISSANCE TECHNOLOGIES LLC Registered adviser | $1,669,530 | 0.68% | 191,900 | Shares | 2026-08-13 | |
| Mega VANGUARD FIDUCIARY TRUST CO | $1,618,687 | 0.66% | 186,056 | Shares | 2026-08-13 | |
| Mega RAYMOND JAMES FINANCIAL INC | $1,455,926 | 0.59% | 167,348 | Shares | 2026-08-14 | |
| Mid Legato Capital Management LLC Registered adviser | $1,375,635 | 0.56% | 158,119 | Shares | 2026-08-06 | |
| Mega Russell Investments Group, Ltd. | $1,301,997 | 0.53% | 149,655 | Shares | 2026-08-06 | |
| Mega Nuveen, LLC | $1,233,023 | 0.50% | 141,727 | Shares | 2026-08-11 | |
| Mega DIMENSIONAL FUND ADVISORS LP Registered adviser | $1,083,131 | 0.44% | 124,498 | Shares | 2026-08-11 | |
| Mid Campbell & CO Investment Adviser LLC Registered adviser | $967,353 | 0.39% | 111,190 | Shares | 2026-08-03 | |
| Mega Mitsubishi UFJ Asset Management Co., Ltd. | $961,845 | 0.39% | 110,557 | Shares | 2026-08-07 | |
| Small NANO CAP NEW MILLENNIUM GROWTH FUND L P | $935,250 | 0.38% | 107,500 | Shares | 2026-08-14 | |
| Mega AQR CAPITAL MANAGEMENT LLC Registered adviser | $904,007 | 0.37% | 103,909 | Shares | 2026-08-14 | |
| Mid IQ EQ FUND MANAGEMENT (IRELAND) Ltd Exempt adviser | $858,594 | 0.35% | 98,689 | Shares | 2026-07-31 | |
| Mega SUSQUEHANNA INTERNATIONAL GROUP, LLP | $777,780 | 0.32% | 89,400 | Call | 2026-08-14 | |
| Mega BANK OF MONTREAL /CAN/ Bank | $759,909 | 0.31% | 87,346 | Shares | 2026-08-12 | |
| Mega SEI INVESTMENTS CO | $676,155 | 0.27% | 77,719 | Shares | 2026-08-14 | |
| Mega UBS Group AG Bank | $673,519 | 0.27% | 77,416 | Shares | 2026-08-13 | |
| Mega GOLDMAN SACHS GROUP INC Holding company | $663,200 | 0.27% | 76,230 | Shares | 2026-08-14 | |
| Mega D. E. Shaw & Co., Inc. | $656,380 | 0.27% | 75,446 | Shares | 2026-08-14 | |
| Mega Bank of New York Mellon Corp Bank | $632,993 | 0.26% | 72,758 | Shares | 2026-08-06 | |
| Large ACADIAN ASSET MANAGEMENT LLC | $612,253 | 0.25% | 70,374 | Shares | 2026-08-13 | |
| Small Bruce & Co., Inc. | $594,088 | 0.24% | 68,286 | Shares | 2026-08-14 | |
| Mega CITADEL ADVISORS LLC Registered adviser | $545,898 | 0.22% | 62,747 | Shares | 2026-09-02 | |
| Mega LPL Financial LLC Broker-dealer | $482,423 | 0.20% | 55,451 | Shares | 2026-08-07 | |
| Mid BRIDGEWAY CAPITAL MANAGEMENT, LLC Registered adviser | $439,350 | 0.18% | 50,500 | Shares | 2026-08-14 | |
| Mid GSA CAPITAL PARTNERS LLP Registered adviser | $427,692 | 0.17% | 49,160 | Shares | 2026-08-06 | |
| Mega ALLIANCEBERNSTEIN L.P. Registered adviser | $344,085 | 0.14% | 39,550 | Shares | 2026-08-14 | |
| Small Old Port Advisors Registered adviser | $336,072 | 0.14% | 38,629 | Shares | 2026-07-21 | |
| Large Squarepoint Ops LLC Registered adviser | $328,329 | 0.13% | 37,739 | Shares | 2026-08-14 | |
| Mega RHUMBLINE ADVISERS Registered adviser | $320,081 | 0.13% | 36,791 | Shares | 2026-08-12 | |
| Large Quantinno Capital Management LP Registered adviser | $270,839 | 0.11% | 31,131 | Shares | 2026-08-13 | |
| Mega DEUTSCHE BANK AG\ Non-US | $247,184 | 0.10% | 28,412 | Shares | 2026-08-07 | |
| Large STATE OF WISCONSIN INVESTMENT BOARD Benefit plan | $236,379 | 0.10% | 27,170 | Shares | 2026-08-14 | |
| Mega WELLS FARGO & COMPANY/MN Bank | $212,035 | 0.09% | 24,372 | Shares | 2026-08-14 | |
| Mega SUSQUEHANNA INTERNATIONAL GROUP, LLP | $203,353 | 0.08% | 23,374 | Shares | 2026-08-14 | |
| Large Brevan Howard Capital Management LP Exempt adviser | $180,020 | 0.07% | 20,692 | Shares | 2026-08-14 | |
| Mega PRICE T ROWE ASSOCIATES INC /MD/ Registered adviser | $177,366 | 0.07% | 20,387 | Shares | 2026-08-14 | |
| Mega FMR LLC Holding company | $168,770 | 0.07% | 19,399 | Shares | 2026-08-13 | |
| Large Concurrent Investment Advisors, LLC Registered adviser | $152,596 | 0.06% | 12,366 | Shares | 2026-10-16 | |
| Micro GAINLINE FINANCIAL PARTNERS, LLC | $152,250 | 0.06% | 12,338 | Shares | 2026-10-15 | |
| Large MetLife Investment Management, LLC Registered adviser | $150,440 | 0.06% | 17,292 | Shares | 2026-08-14 | |
| Large Cresset Asset Management, LLC Registered adviser | $142,184 | 0.06% | 16,343 | Shares | 2026-08-14 | |
| Mega Invesco Ltd. Adviser | $130,151 | 0.05% | 14,960 | Shares | 2026-08-14 | |
| Mid Graham Capital Management, L.P. Registered adviser | $128,994 | 0.05% | 14,827 | Shares | 2026-08-14 | |
| Large WEALTH ENHANCEMENT ADVISORY SERVICES, LLC | $127,398 | 0.05% | 10,324 | Shares | 2026-10-13 | |
| Micro PIER 88 INVESTMENT PARTNERS LLC | $123,540 | 0.05% | 14,200 | Shares | 2026-08-04 | |
| Mid Magnetar Financial LLC Registered adviser | $120,189 | 0.05% | 13,815 | Shares | 2026-08-14 | |
| Mega CITIGROUP INC Bank | $116,832 | 0.05% | 13,429 | Shares | 2026-08-03 | |
| Large MIRAE ASSET GLOBAL ETFS HOLDINGS Ltd. | $116,588 | 0.05% | 13,401 | Shares | 2026-08-14 | |
| Mega JPMORGAN CHASE & CO Bank | $109,262 | 0.04% | 12,559 | Shares | 2026-08-12 | |
| Mid Advyzon Investment Management, LLC Registered adviser | $107,340 | 0.04% | 12,338 | Shares | 2026-08-14 | |
| Mid OCCUDO QUANTITATIVE STRATEGIES LP Registered adviser | $106,627 | 0.04% | 12,256 | Shares | 2026-08-13 | |
| Small PCM Encore, LLC Registered adviser | $102,921 | 0.04% | 11,830 | Shares | 2026-08-11 | |
| Mega JANE STREET GROUP, LLC | $99,571 | 0.04% | 11,445 | Shares | 2026-08-14 | |
| Large Schonfeld Strategic Advisors LLC Registered adviser | $96,865 | 0.04% | 11,134 | Shares | 2026-08-14 | |
| Small AXQ CAPITAL, LP Registered adviser | $93,124 | 0.04% | 10,704 | Shares | 2026-08-06 | |
| Mega Vanguard Global Advisers, LLC Registered adviser | $89,488 | 0.04% | 10,286 | Shares | 2026-08-13 | |
| Large Police & Firemen's Retirement System of New Jersey | $74,150 | 0.03% | 8,523 | Shares | 2026-07-23 | |
| Large NEW YORK STATE COMMON RETIREMENT FUND | $73,836 | 0.03% | 8,487 | Shares | 2026-07-29 | |
| Large OSAIC HOLDINGS, INC. Holding company | $48,937 | 0.02% | 5,625 | Shares | 2026-08-14 | |
| Mega BARCLAYS PLC Bank | $44,422 | 0.02% | 5,106 | Shares | 2026-08-14 | |
| Mega BNP PARIBAS ARBITRAGE, SA Non-US | $37,949 | 0.02% | 4,362 | Shares | 2026-08-13 | |
| Small Pinnacle Wealth Planning Services, Inc. Registered adviser | $36,366 | 0.01% | 4,180 | Shares | 2026-08-07 | |
| Mega ROYAL BANK OF CANADA Bank | $36,321 | 0.01% | 4,175 | Shares | 2026-08-14 | |
| Mid ANTIPODES PARTNERS Ltd Registered adviser | $34,747 | 0.01% | 3,994 | Shares | 2026-08-06 | |
| Large Allworth Financial LP | $29,345 | 0.01% | 3,373 | Shares | 2026-08-11 | |
| Mega Legal & General Group Plc | $26,526 | 0.01% | 3,049 | Shares | 2026-08-14 | |
| Mid Ameritas Investment Partners, Inc. Registered adviser | $24,316 | 0.01% | 2,795 | Shares | 2026-08-13 | |
| Mid GAMMA Investing LLC Registered adviser | $15,005 | 0.01% | 1,216 | Shares | 2026-10-08 | |
| Mid Versant Capital Management, Inc Registered adviser | $14,153 | 0.01% | 1,147 | Shares | 2026-10-02 | |
| Mega UBS AM, a distinct business unit of UBS ASSET MANAGEMENT AMERICAS LLC Registered adviser | $13,363 | 0.01% | 1,536 | Shares | 2026-08-13 | |
| Mid SIGNATUREFD, LLC Registered adviser | $12,588 | 0.01% | 1,447 | Shares | 2026-07-24 | |
| Mid Tower Research Capital LLC (TRC) | $9,865 | 0.00% | 1,134 | Shares | 2026-08-11 | |
| Large NISA INVESTMENT ADVISORS, LLC Registered adviser | $8,440 | 0.00% | 684 | Shares | 2026-10-20 | |
| Mid Parallel Advisors, LLC Registered adviser | $5,515 | 0.00% | 634 | Shares | 2026-08-05 | |
| Mid Sterling Capital Management LLC Registered adviser | $5,106 | 0.00% | 587 | Shares | 2026-07-28 | |
| Large FEDERATED HERMES, INC. Adviser | $4,437 | 0.00% | 510 | Shares | 2026-08-12 | |
| Large Arax Advisory Partners Registered adviser | $3,523 | 0.00% | 405 | Shares | 2026-08-10 | |
| Mega CALIFORNIA STATE TEACHERS RETIREMENT SYSTEM Benefit plan | $3,384 | 0.00% | 389 | Shares | 2026-08-24 |
Showing the top 100 of 112 holders. Create a free account to see every holder, past quarters, search, filters and CSV export.