908 Devices Inc.
US ˙ NasdaqGM ˙ US65443P1021

SecurityMASS / 908 Devices Inc.
InstitutionMorgan Stanley
Latest Disclosed Ownership373,258 shares
Latest Disclosed Value $ 2,284,340
Morgan Stanley reports 15.26% decrease in ownership of MASS / 908 Devices Inc.

On May 15, 2026 - Morgan Stanley filed a 13F-HR form disclosing ownership of 373,258 shares of 908 Devices Inc. (US:MASS) valued at $2,284,339 USD as of March 31, 2026. The entity filed a previous 13F-HR/A on May 27, 2026 disclosing 440,486 shares of 908 Devices Inc.. This represents a change in shares of -15.26% during the quarter. The current value of the position is $3,292,136 USD.

Institutional Ownership: 13F and NPORT Filings

The Security and Class in the table below are shown exactly as filed by the investor. We do our best to track continuity of investments through acquisitions, and this will be reflected in the table as changes in names. In addition to descriptive data, performance of the investment is shown over time. To calculate quarterly performance, we first calculate cost basis of the shares purchased during the quarter, then use that to calculate gross profit. Quarterly return is Gross Profit / Starting Portfolio value.

Note that cost basis is calculated and stored in thousands, so small quarterly changes in shares frequently result in a cost basis of zero.

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Disclosed Equity Positions (from 13F/NPORT Filings)
File
Date		 Effective
Date		Form Security Class ID Avg Price
Paid (Est)		 Reported
Shares		 ΔShares ΔShares
(%)		 Reported
Value
(x1000)		 ΔValue
(%)		 Alloc
(%)		 ΔAlloc ΔAlloc (%) Cost Basis
(x1000)		 Unrealized
Gain/Loss
(x1000)
2026-05-15 2026-03-31 13F 908 DEVICES COM 65443P102 373,258 -67,228 -15.26 2,284 -1.21 0.0001
2026-05-27 2025-12-31 13F/A-1 908 DEVICES COM 65443P102 440,486 -131,194 -22.95 2,313 -53.82 0.0001
2026-02-13 2025-12-31 13F 908 DEVICES COM 65443P102 440,486 -131,194 2,313 0.0001
2026-05-27 2025-09-30 13F/A-1 908 DEVICES COM 65443P102 571,680 17,435 3.15 5,008 26.73 0.0003
2025-11-14 2025-09-30 13F 908 DEVICES COM 65443P102 571,680 17,435 5,008 0.0003
2025-08-15 2025-06-30 13F 908 DEVICES COM 65443P102 554,245 22,636 4.26 3,952 65.94 0.0003
2025-05-15 2025-03-31 13F 908 DEVICES COM 65443P102 531,609 265,041 99.43 2,382 306.31 0.0002
2025-05-15 2024-12-31 13F/A-1 908 DEVICES COM 65443P102 266,568 162,597 156.39 586 62.78 0.0000
2025-02-14 2024-12-31 13F 908 DEVICES COM 65443P102 266,568 162,597 586 0.0000
2025-05-14 2024-09-30 13F/A-2 908 DEVICES COM 65443P102 103,971 65,316 168.97 361 80.90 0.0000
2025-02-14 2024-09-30 13F/A-1 908 DEVICES COM 65443P102 103,971 65,316 361 0.0000
2024-11-14 2024-09-30 13F 908 DEVICES COM 65443P102 103,971 65,316 361 0.0000
2025-05-14 2024-06-30 13F/A-2 908 DEVICES COM 65443P102 38,655 644 1.69 199 -30.42 0.0000
2024-10-17 2024-06-30 13F/A-1 908 DEVICES COM 65443P102 38,655 644 199 0.0000
2024-08-14 2024-06-30 13F 908 DEVICES COM 65443P102 38,655 644 199 0.0000
2024-10-17 2024-03-31 13F/A-2 908 DEVICES COM 65443P102 38,011 -32,314 -45.95 287 -63.75 0.0000
2024-08-16 2024-03-31 13F/A-1 908 DEVICES COM 65443P102 38,011 -32,314 287 0.0000
2024-05-15 2024-03-31 13F 908 DEVICES COM 65443P102 38,011 -32,314 287 0.0000
2024-08-16 2023-12-31 13F/A-1 908 DEVICES COM 65443P102 70,325 28,513 68.19 789 183.81 0.0001
2024-02-13 2023-12-31 13F 908 DEVICES COM 65443P102 70,325 28,513 789 0.0001
2023-11-15 2023-09-30 13F 908 DEVICES COM 65443P102 41,812 -37,695 -47.41 278 -48.99 0.0000
2023-08-14 2023-06-30 13F 908 DEVICES COM 65443P102 79,507 -33,830 -29.85 545 -44.05 0.0001
2023-05-15 2023-03-31 13F 908 DEVICES COM 65443P102 113,337 31,052 37.74 975 55.34 0.0001
2023-02-14 2022-12-31 13F 908 DEVICES COM 65443P102 82,285 16,190 24.50 627 -42.37 0.0001
2022-11-14 2022-09-30 13F 908 DEVICES COM 65443P102 66,095 -48,608 -42.38 1,088 -53.92 0.0001
2022-10-27 2022-06-30 13F/A-1 908 DEVICES COM 65443P102 114,703 93,390 438.18 2,361 484.41 0.0003
2022-08-15 2022-06-30 13F 908 DEVICES COM 65443P102 114,703 93,390 2,361 0.0001
2022-10-27 2022-03-31 13F/A-1 908 DEVICES COM 65443P102 21,313 -5,433 -20.31 404 -41.62 0.0001
2022-05-13 2022-03-31 13F 908 DEVICES COM 65443P102 21,313 -5,433 404 0.0001
2022-02-14 2021-12-31 13F 908 DEVICES COM 65443P102 26,746 -20,981 -43.96 692 -55.41 0.0001
2021-11-15 2021-09-30 13F 908 DEVICES COM 65443P102 47,727 22,086 86.14 1,552 56.29 0.0002
2021-08-23 2021-06-30 13F/A-1 908 DEVICES COM 65443P102 25,641 5,230 25.62 993 0.30 0.0001
2021-08-16 2021-06-30 13F 908 DEVICES COM 65443P102 25,641 5,230 993 0.0000
2021-05-17 2021-03-31 13F 908 DEVICES COM 65443P102 20,411 20,243 12,049.40 990 9,800.00 0.0001
2021-02-16 2020-12-31 13F 908 DEVICES COM 65443P102 168 168 10 0.0000
Legend
Shares
The total number of shares held by the institution at the end of the reporting period (the effective date). This is provided in the filing.
Value
The total value of the shares as of the effective date. This is provided in the filing.
Avg. Share Price
The weighted average share price of the shares held by the institution. We use FIFO accounting to determine this price
Class
This is the security class as indicated by the filer. There are a variety of values for this field. Common values include "EC" = equity common, "EP" - equity preferred
Allocation (%)
The percent of the institution's portfolio that this position represents. This is provided in NPORT filings. For 13F filings, we calculate it.
Change in Allocation
The change in allocation from the prior reporting period. This is calculated as current allocation - prior allocation.
Change in Allocation (%)
The percent change in allocation from the prior reporting period. This is calculated as (current allocation - prior allocation) / prior allocation.
Cost Basis
The total cost of the shares held. This is calculated as reported shares * avg. share price
Unrealized Gain/Loss
This is the market value of the position as of the effective date minus the cost basis.