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Disclosery

MASS 908 DEVICES INC

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Stock (common), issuer CIK 1555279

108 managers (112 13F filers) reported a position in MASS shares at 2026-03-31, 27,947,374 shares in all. 7 filers opened a position and 16 filers sold out during the quarter.

Managers
108
13F filers
112
New
7
Added
32
Reduced
46
Sold out
16
Shares held by filers
27,947,374

Shares held by filers adds up every 13F filer's report, so a share reported by a parent and by its subsidiary counts twice (H9). Managers counts each filer group once.

13D and 13G filers

No 13D or 13G on this security in the data. Structured 13D/G data starts 2024-12-18.

Insider trades

The latest Form 4 transactions, non-derivative.
OwnerDateSharesPriceFiling
Brown Christopher D.director2026-10-07+60,000 M$1.75Form 4
Brown Christopher D.director2026-10-07-30,000 S$11.89Form 4
Griffith Joseph H. IVofficer (Chief Financial Officer)2026-10-06-5,000 S$13.03Form 4

13F holders, Q1 2026

Filers in the available 13F reports with a share position at 2026-03-31, filer groups collapsed to one row (method), largest first. Options and principal amounts are left out. A group row states no % of portfolio, since each member reports its own portfolio: the members' percents are listed under it. A value about 1,000 times or 1/1,000 of the price other filers imply is shown as filed but neither ranks the row nor enters a sum.

HolderSharesValue% of portfolioChangeSource
First Light Asset Management, LLC6,072,563$37.2M3.33%+1,236,37713F-HRTimeline
AWM Investment Company, Inc.5,199,924$31.8M3.52%013F-HRTimeline
ARK Investment Management LLCin group ARK Investment Management LLC1,946,685$11.9M0.09%-39,30113F-HRTimelineGroup
BlackRock, Inc.in group BlackRock, Inc.1,767,316$10.8M<0.01%-34,45613F-HRTimelineGroup
VANGUARD GROUP INCgroup of 4 filers holding1,473,466$9.02MnewTimeline
NEEDHAM INVESTMENT MANAGEMENT LLCin group NEEDHAM INVESTMENT MANAGEMENT…1,240,000$7.59M0.39%+470,00013F-HRTimelineGroup
First Eagle Investment Management, LLCin group First Eagle Investment Manage…803,606$4.92M0.01%+179,72313F-HR/ATimelineGroup
GEODE CAPITAL MANAGEMENT, LLCin group GEODE CAPITAL MANAGEMENT, LLC695,455$4.26M<0.01%+6,88913F-HRTimelineGroup
Granahan Investment Management, LLC695,070$4.25M0.21%+603,92913F-HRTimeline
STATE STREET CORPin group STATE STREET CORP625,892$3.83M<0.01%+29,59813F-HRTimelineGroup
Tao Capital Management LP568,981$3.48M2.93%013F-HRTimeline
ESSEX INVESTMENT MANAGEMENT CO LLC491,221$3.01M0.48%+8,60713F-HRTimeline
MORGAN STANLEYin group MORGAN STANLEY373,258$2.28M<0.01%-67,22813F-HRTimelineGroup
Meros Investment Management, LP361,738$2.21M0.96%+14,70313F-HRTimeline
Prescott Group Capital Management, L.L.…361,595$2.21M0.22%013F-HRTimeline
HighMark Wealth Management LLC319,350$1.95M0.8%+78,35013F-HRTimeline
Sumitomo Mitsui Trust Group, Inc.in group Sumitomo Mitsui Trust Group, …269,873$1.65M<0.01%-18,20813F-HRTimelineGroup
Amova Asset Management Americas, Inc.in group Amova Asset Management Americ…269,873$1.65M0.02%-18,20813F-HRTimelineGroup
GSA CAPITAL PARTNERS LLP251,028$1.54M0.1%+128,89113F-HRTimeline
NORTHERN TRUST CORPin group NORTHERN TRUST CORP241,332$1.48M<0.01%+11,03813F-HRTimelineGroup
GM Advisory Group, LLC238,218$1.46M0.06%-40,57413F-HRTimeline
RENAISSANCE TECHNOLOGIES LLC230,200$1.41M<0.01%+8,10013F-HRTimeline
CHARLES SCHWAB INVESTMENT MANAGEMENT INCin group Charles Schwab Trust Co229,489$1.4M<0.01%-11,44013F-HRTimelineGroup
Squarepoint Ops LLCin group Squarepoint Ops LLC213,193$1.3M<0.01%-5,48313F-HRTimelineGroup
RAYMOND JAMES FINANCIAL INCin group RAYMOND JAMES FINANCIAL INC176,520$1.08M<0.01%-1,74713F-HRTimelineGroup
SEI INVESTMENTS COin group SEI INVESTMENTS CO164,894$1.01M<0.01%+82,93413F-HRTimelineGroup
Legato Capital Management LLC153,450$939K0.09%-2,14413F-HRTimeline
Russell Investments Group, Ltd.in group Russell Investments Group, Lt…145,329$889K<0.01%+143,06113F-HRTimelineGroup
CITADEL ADVISORS LLCin group CITADEL ADVISORS LLC144,547$885K<0.01%-119,82613F-HRTimelineGroup
MILLENNIUM MANAGEMENT LLCin group MILLENNIUM MANAGEMENT LLC142,422$872K<0.01%-15,68113F-HRTimelineGroup
Mitsubishi UFJ Asset Management Co., Lt…in group Mitsubishi UFJ Trust & Bankin…132,466$811K<0.01%-8,03713F-HRTimelineGroup
NANO CAP NEW MILLENNIUM GROWTH FUND L P120,000$734K0.69%013F-HRTimeline
DIMENSIONAL FUND ADVISORS LPin group DIMENSIONAL FUND ADVISORS LP118,751$726K<0.01%-127,86313F-HRTimelineGroup
GOLDMAN SACHS GROUP INCin group GOLDMAN SACHS GROUP INC111,212$681K<0.01%-88,07413F-HRTimelineGroup
AQR CAPITAL MANAGEMENT LLCin group AQR CAPITAL MANAGEMENT LLC104,406$639K<0.01%-40013F-HRTimelineGroup
Nuveen, LLCin group TIAA101,074$619K<0.01%+1,08613F-HRTimelineGroup
UBS Group AGgroup of 2 filers holding94,981$581K-17,830Timeline
IQ EQ FUND MANAGEMENT (IRELAND) Ltd89,769$549K0.04%+11,74313F-HRTimeline
BANK OF MONTREAL /CAN/in group BANK OF MONTREAL /CAN/87,375$535K<0.01%-3,47713F-HRTimelineGroup
Trexquant Investment LP73,194$448K<0.01%new13F-HRTimeline
Cassaday & Co Wealth Management LLC71,629$438K0.01%013F-HRTimeline
Bruce & Co., Inc.68,286$418K0.12%013F-HRTimeline
LPL Financial LLC67,789$415K<0.01%-77213F-HRTimeline
Bank of New York Mellon Corpin group Bank of New York Mellon Corp59,041$361K<0.01%-1,98113F-HRTimelineGroup
AMERICAN CENTURY COMPANIES INCin group AMERICAN CENTURY COMPANIES INC55,894$342K<0.01%013F-HRTimelineGroup
BRIDGEWAY CAPITAL MANAGEMENT, LLC50,500$309K0.01%013F-HRTimeline
Brooklyn Investment Group46,259$283K0.01%new13F-HRTimeline
TWO SIGMA INVESTMENTS, LPin group TWO SIGMA INVESTMENTS, LP44,127$270K<0.01%-28,20013F-HRTimelineGroup
XTX Topco Ltdin group XTX Topco Ltd41,365$253K<0.01%+21,51313F-HRTimelineGroup
Old Port Advisors38,629$236K0.05%013F-HRTimeline
RHUMBLINE ADVISERS34,550$211K<0.01%-22313F-HRTimeline
SUSQUEHANNA INTERNATIONAL GROUP, LLPin group SUSQUEHANNA INTERNATIONAL GRO…33,841$207K<0.01%+12,11813F-HRTimelineGroup
Campbell & CO Investment Adviser LLC29,656$181K0.01%-50,89713F-HRTimeline
ALLIANCEBERNSTEIN L.P.33,150$174K<0.01%-8,40013F-HRTimeline
STATE OF WISCONSIN INVESTMENT BOARD26,198$160K<0.01%-6,09613F-HRTimeline
BANK OF AMERICA CORP /DE/in group BANK OF AMERICA CORP /DE/25,078$153K<0.01%-1,26313F-HRTimelineGroup
Quantinno Capital Management LP23,725$145K<0.01%+49913F-HRTimeline
PRICE T ROWE ASSOCIATES INC /MD/19,385$119K<0.01%+5,55813F-HRTimeline
DEUTSCHE BANK AG\in group DEUTSCHE BANK AG\18,429$113K<0.01%013F-HRTimelineGroup
49 WEALTH MANAGEMENT, LLC17,101$105K0.01%-48013F-HRTimeline
MetLife Investment Management, LLCin group MetLife Investment Management…17,022$104K<0.01%+6,07413F-HRTimelineGroup
Cresset Asset Management, LLC16,343$100K<0.01%-10,00013F-HRTimeline
JANE STREET GROUP, LLCin group JANE STREET GROUP, LLC14,301$87.5K<0.01%-22,49413F-HRTimelineGroup
Invesco Ltd.in group Invesco Ltd.14,128$86.5K<0.01%-30013F-HRTimelineGroup
Dynamic Technology Lab Private Ltd13,898$85.1K0.01%new13F-HRTimeline
Graham Capital Management, L.P.13,247$81.1K<0.01%-7,54013F-HRTimeline
MIRAE ASSET GLOBAL ETFS HOLDINGS Ltd.in group Mirae Asset Global Investment…13,028$79.7K<0.01%+30613F-HRTimelineGroup
Concurrent Investment Advisors, LLCin group Concurrent Investment Advisor…11,903$72.8K<0.01%+15813F-HRTimelineGroup
PCM Encore, LLC11,830$72.4K0.01%013F-HRTimeline
JPMORGAN CHASE & COin group JPMORGAN CHASE & CO11,300$65K<0.01%+30713F-HR/ATimelineGroup
FMR LLCin group FMR LLC10,543$64.5K<0.01%-813F-HRTimelineGroup
WELLS FARGO & COMPANY/MNin group WELLS FARGO & COMPANY/MN10,480$64.1K<0.01%-20,14313F-HR/ATimelineGroup
Intelligence Driven Advisers, LLC10,000$61.2K0.01%new13F-HRTimeline
Police & Firemen's Retirement System of…8,523$52.2K<0.01%013F-HRTimeline
NEW YORK STATE COMMON RETIREMENT FUND8,487$51.9K<0.01%013F-HRTimeline
CWM, LLCin group CWM, LLC6,594$40.4K<0.01%-20013F-HRTimelineGroup
BNP PARIBAS FINANCIAL MARKETSin group BNP PARIBAS FINANCIAL MARKETS5,945$36.4K<0.01%-1,61213F-HRTimelineGroup
Allworth Financial LP5,349$32.7K<0.01%013F-HRTimeline
OSAIC HOLDINGS, INC.in group OSAIC HOLDINGS, INC.5,100$31.2K<0.01%+4,97513F-HRTimelineGroup
BARCLAYS PLCin group BARCLAYS PLC4,978$30.5K<0.01%-39,55013F-HRTimelineGroup
ANTIPODES PARTNERS Ltd4,402$26.9K<0.01%-69213F-HRTimeline
Pinnacle Wealth Planning Services, Inc.4,180$25.6K<0.01%-17813F-HRTimeline
Tower Research Capital LLC (TRC)in group Tower Research Capital LLC (T…4,140$25.3K<0.01%+2,22513F-HRTimelineGroup
Ameritas Investment Partners, Inc.in group Ameritas Investment Partners,…2,795$17.1K<0.01%013F-HRTimelineGroup
Legal & General Group Plcin group Legal & General Group Plc2,492$15.3K<0.01%-24213F-HRTimelineGroup
SIGNATUREFD, LLC1,966$12K<0.01%013F-HRTimeline
Parallel Advisors, LLC1,937$11.9K<0.01%new13F-HR/ATimeline
CALIFORNIA STATE TEACHERS RETIREMENT SY…1,482$9.07K<0.01%-20413F-HRTimeline
CITIGROUP INCin group CITIGROUP INC1,429$8.74K<0.01%+80913F-HRTimelineGroup
Versant Capital Management, Inc1,070$6.55K<0.01%013F-HRTimeline
NISA INVESTMENT ADVISORS, LLC684$4.19K<0.01%013F-HRTimeline
GAMMA Investing LLC606$3.71K<0.01%+13313F-HRTimeline
Farther Finance Advisors, LLC393$2.44K<0.01%new13F-HRTimeline
FEDERATED HERMES, INC.in group FEDERATED HERMES, INC.360$2.2K<0.01%013F-HRTimelineGroup
Sterling Capital Management LLC348$2.13K<0.01%-23013F-HRTimeline
ROYAL BANK OF CANADAin group ROYAL BANK OF CANADA418$2K<0.01%-36313F-HRTimelineGroup
Optiver Holding B.V.in group Optiver Holding B.V.282$1.73K<0.01%-18413F-HR/ATimelineGroup
Essential Partners LLC218$1.33K<0.01%013F-HRTimeline
GROUP ONE TRADING LLC202$1.24K<0.01%+7013F-HRTimeline
PNC Financial Services Group, Inc.in group PNC Financial Services Group,…156$955<0.01%+1913F-HRTimelineGroup
EverSource Wealth Advisors, LLCin group EverSource Wealth Advisors, L…130$795<0.01%+1013F-HR/ATimelineGroup
Cornerstone Financial Management LLC129$789<0.01%013F-HR/ATimeline
JONES FINANCIAL COMPANIES LLLPin group JONES FINANCIAL COMPANIES LLLP100$578<0.01%-6913F-HRTimelineGroup
True Wealth Design, LLC29$178<0.01%-513F-HRTimeline
Sunbelt Securities, Inc.22$135<0.01%013F-HRTimeline
Caitong International Asset Management …4$24<0.01%-1713F-HRTimeline
SBI Securities Co., Ltd.3$18<0.01%new13F-HRTimeline
FNY Investment Advisers, LLC50$00%013F-HRTimelineValue filed as zero, left out of ratios.

Events

  • Brown Christopher D. acquired 30,000 MASS shares on 2026-10-07, Form 4 filed 2026-10-09. 0001836988-26-000027

    Accepted , ingested

  • Griffith Joseph H. IV sold 5,000 MASS shares on 2026-10-06, Form 4 filed 2026-10-08. 0001431531-26-000009

    Accepted , ingested