908 Devices Inc.
US ˙ NasdaqGM ˙ US65443P1021

SecurityMASS / 908 Devices Inc.
InstitutionCresset Asset Management, LLC
Latest Disclosed Ownership16,343 shares
Latest Disclosed Value $ 100,019
Cresset Asset Management, LLC reports 37.96% decrease in ownership of MASS / 908 Devices Inc.

On May 15, 2026 - Cresset Asset Management, LLC filed a 13F-HR form disclosing ownership of 16,343 shares of 908 Devices Inc. (US:MASS) valued at $100,019 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 17, 2026 disclosing 26,343 shares of 908 Devices Inc.. This represents a change in shares of -37.96% during the quarter. The current value of the position is $129,600 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 16,343 -10,000 -37.96 100 -27.54 0.0004
2026-02-17 2025-12-31 13F 908 DEVICES COM 65443P102 26,343 10,677 68.15 138 0.73 0.0006
2026-01-22 2025-09-30 13F/A-1 908 DEVICES COM 65443P102 15,666 3,921 33.38 137 65.06 0.0006
2025-11-12 2025-09-30 13F 908 DEVICES COM 65443P102 16,100 4,355 141 0.0005
2026-01-22 2025-06-30 13F/A-1 908 DEVICES COM 65443P102 11,745 -442 -3.63 84 53.70 0.0004
2025-08-13 2025-06-30 13F 908 DEVICES COM 65443P102 11,745 -442 84 0.0004
2025-05-13 2025-03-31 13F 908 DEVICES COM 65443P102 12,187 442 3.76 55 116.00 0.0003
2025-02-14 2024-12-31 13F 908 DEVICES COM 65443P102 11,745 0 0.00 26 -37.50 0.0001
2024-11-14 2024-09-30 13F 908 DEVICES COM 65443P102 11,745 -2,482 -17.45 41 -45.21 0.0002
2024-08-14 2024-06-30 13F 908 DEVICES COM 65443P102 14,227 1,764 14.15 73 -22.34 0.0003
2024-05-15 2024-03-31 13F 908 DEVICES COM 65443P102 12,463 -130 -1.03 94 -33.33 0.0005
2024-02-14 2023-12-31 13F 908 DEVICES COM 65443P102 12,593 -2,377 -15.88 141 42.42 0.0008
2023-11-14 2023-09-30 13F 908 DEVICES COM 65443P102 14,970 194 1.31 100 -1.98 0.0004
2023-08-14 2023-06-30 13F 908 DEVICES COM 65443P102 14,776 95 0.65 101 -19.84 0.0001
2023-05-12 2023-03-31 13F 908 DEVICES COM 65443P102 14,681 -1 -0.01 126 13.51 0.0025
2023-02-14 2022-12-31 13F 908 DEVICES COM 65443P102 14,682 0 0.00 112 -54.13 0.0014
2022-11-14 2022-09-30 13F 908 DEVICES COM 65443P102 14,682 14,682 242 0.0031
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.