As of November 6, 2026, 4 holders' latest Schedule 13D or 13G filings report owning 5% or more of 908 Devices Inc. The largest reported stake is Mathew P. Arens', at 17.09%. 13 filings are on record since August 11, 2025 (Schedule 13G/A, February 17, 2026).
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Key facts
- · Reporting person: BlackRock, Inc. · Sole voting: 1,988,695 · Shared voting: 0 · Sole dispositive: 2,039,439 · Shared dispositive: 0 · SCHEDULE 13G/A, 2026-10-27
- · Reporting person: ARCH Venture Fund VII, L.P. · Sole voting: 0 · Shared voting: 5,725,045 · Sole dispositive: 0 · Shared dispositive: 5,725,045 · SCHEDULE 13G/A, 2026-08-14
- · Reporting person: AWM Investment Company, Inc. · Sole voting: 4,879,773 · Sole dispositive: 4,879,773 · SCHEDULE 13G/A, 2026-08-14
- · Reporting person: ARK Investment Management LLC · Sole voting: 2,027,920 · Shared voting: 0 · Sole dispositive: 2,027,920 · Shared dispositive: 0 · SCHEDULE 13G/A, 2026-08-14
- · Holder: BlackRock, Inc. · Percent: 5.1% · SCHEDULE 13G
908 Devices Inc. has 13 Schedule 13D or 13G filings on record since 2025-08-11. 4 holders' latest filing reports 5% or more of common stock. Each figure below is the holder's own, as filed, with the filing linked.
Holders
| Holder | Percent | Shares | Latest | Event date |
|---|---|---|---|---|
| 17.09% | 6,184,739 | SCHEDULE 13G/A, 2026-02-17 | 2025-12-31 | |
| 14.1% | 5,824,877 | SCHEDULE 13G/A, 2026-08-14 | 2026-06-30 | |
| AWM Investment Company, Inc. | 11.8% | 4,879,773 | SCHEDULE 13G/A, 2026-08-14 | 2026-06-30 |
| ARK Investment Management LLC | 5.32% | 2,027,920 | SCHEDULE 13G/A, 2026-08-14 | 2026-06-30 |
| BlackRock, Inc. | 4.9% | 2,039,439 | SCHEDULE 13G/A, 2026-10-27 | 2026-09-30 |
| State Street Corporation | 1.6% | 596,294 | SCHEDULE 13G, 2026-02-09 | 2025-12-31 |
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More on 908 Devices Inc. and the records around it.
908 Devices Inc. elsewhere on the record
- Acquisition May 2026
- Who owns it
Companies that share a holder
- First Light Asset Management, LLC also filed stake reports on 12 other companies: NeuroPace Inc (Sep 2026), Neogenomics, Inc. (Aug 2026), PALVELLA THERAPEUTICS, INC. (Aug 2026)
- ARK Investment Management LLC also filed stake reports on 20 other companies: Tempus AI, Inc. (Nov 2026), 10x Genomics, Inc. (Oct 2026), Twist Bioscience Corp (Sep 2026)
- AWM Investment Company, Inc. also filed stake reports on 32 other companies: Brazil Potash Corp. (Aug 2026), EVERSPIN TECHNOLOGIES INC. (Aug 2026), LIBERTY DEFENSE HOLDINGS, LTD. (Aug 2026)
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What the Full Report on 908 Devices Inc. covers
The Short Answer
Which Company This Is
What They Do, And How The Money Works
Who Runs It, And How To Reach Them
The Money: Funding, Valuation, Runway
Who Pays Them, And Who They Are Up Against
Warning Bells
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Voting and dispositive power, as filed
| Reporting person | Sole voting | Shared voting | Sole dispositive | Shared dispositive | Filing |
|---|---|---|---|---|---|
| ARCH Venture Fund VII, L.P. | 0 | 5,725,045 | 0 | 5,725,045 | SCHEDULE 13G/A, 2026-08-14 |
| ARCH Venture Partners VII, L.P. | 0 | 5,725,045 | 0 | 5,725,045 | SCHEDULE 13G/A, 2026-08-14 |
| ARCH Venture Partners VII, LLC | 0 | 5,725,045 | 0 | 5,725,045 | SCHEDULE 13G/A, 2026-08-14 |
| Keith Crandell | 99,832 | 5,725,045 | 99,832 | 5,725,045 | SCHEDULE 13G/A, 2026-08-14 |
| Clinton Bybee | 0 | 5,725,045 | 0 | 5,725,045 | SCHEDULE 13G/A, 2026-08-14 |
| Robert Nelsen | 0 | 5,725,045 | 0 | 5,725,045 | SCHEDULE 13G/A, 2026-08-14 |
| AWM Investment Company, Inc. | 4,879,773 | — | 4,879,773 | — | SCHEDULE 13G/A, 2026-08-14 |
| ARK Investment Management LLC | 2,027,920 | 0 | 2,027,920 | 0 | SCHEDULE 13G/A, 2026-08-14 |
| Catherine D. Wood | 0 | 2,027,920 | 0 | 2,027,920 | SCHEDULE 13G/A, 2026-08-14 |
| BlackRock, Inc. | 1,988,695 | 0 | 2,039,439 | 0 | SCHEDULE 13G/A, 2026-10-27 |
The latest filing identifies 908 Devices Inc. by CUSIP 65443P102 and gives its principal executive office as 44 3rd Avenue, Burlington, MA 01803 (SCHEDULE 13G/A, 2026-10-27).
What the percentages are based on
The information required by Item 4(b) is incorporated by reference to Row 11 of the cover pages hereto.Keith Crandell, SCHEDULE 13G/A, 2026-08-14
Timeline
| Filed | Holder | Percent | Filing |
|---|---|---|---|
| 2025-08-11 | State Street Corporation | 6.4% | SCHEDULE 13G |
| 2025-11-04 | ARK Investment Management LLC | 5.41% | SCHEDULE 13G/A |
| 2025-11-14 | First Light Asset Management, LLC | 9.84% | SCHEDULE 13G |
| 2025-12-05 | First Light Asset Management, LLC | 12.93% | SCHEDULE 13G/A |
| 2026-02-09 | State Street Corporation | 1.6% | SCHEDULE 13G |
| 2026-02-17 | Mathew P. Arens | 17.09% | SCHEDULE 13G/A |
| 2026-05-15 | Keith Crandell | 15.3% | SCHEDULE 13G/A |
| 2026-06-05 | ARK Investment Management LLC | 4.94% | SCHEDULE 13G/A |
| 2026-07-27 | BlackRock, Inc. | 5.1% | SCHEDULE 13G |
| 2026-08-14 | Keith Crandell | 14.1% | SCHEDULE 13G/A |
| 2026-08-14 | ARK Investment Management LLC | 5.32% | SCHEDULE 13G/A |
| 2026-08-14 | AWM Investment Company, Inc. | 11.8% | SCHEDULE 13G/A |
| 2026-10-27 | BlackRock, Inc. | 4.9% | SCHEDULE 13G/A |
Questions about who owns 908 Devices Inc.
Who owns 908 Devices Inc.?
On this page, 4 holders' latest ownership filings report 5% or more of 908 Devices Inc.: Mathew P. Arens (17.09%, Schedule 13G/A, filed 2026-02-17), Keith Crandell (14.1%, Schedule 13G/A, filed 2026-08-14), AWM Investment Company, Inc. (11.8%, Schedule 13G/A, filed 2026-08-14) and ARK Investment Management LLC (5.32%, Schedule 13G/A, filed 2026-08-14).
Who are the largest shareholders of 908 Devices Inc.?
By the share each holder's latest filing reports, the largest holders of 908 Devices Inc. on this page are Mathew P. Arens (17.09%), Keith Crandell (14.1%) and AWM Investment Company, Inc. (11.8%).
When did Mathew P. Arens buy into 908 Devices Inc.?
The filings give report dates, not purchase dates. The earliest filing from Mathew P. Arens on this page is the Schedule 13G/A, filed 2026-02-17, reporting 17.09%. That earliest filing is itself an amendment, which updates an earlier report.
Is this an audit or a full list?
Neither. The ownership list on this page covers only Schedule 13D and 13G filings, which holders make once they own 5% or more of a class of shares (an amendment can report a stake that has since fallen below 5%); 13 such filings are shown here. It is not an audit and not a full cap table: holders who never reached 5% are not listed, and a stake can change after its latest filing.
Also on the record for 908 Devices Inc.
| Date | Record | Figure | Our page | Source |
|---|---|---|---|---|
| May 4, 2026 | Acquired NIRLAB SA | $15M | Acquisition | Source |
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Where this comes from
Anyone who comes to own more than 5% of a class of a listed company's voting shares has to tell the SEC. A holder who may seek to change or influence the company files Schedule 13D, and has to say in Item 4, "Purpose of Transaction", what it intends to do. A holder with no such intent, such as many index and passive funds, may file the shorter Schedule 13G. Both are amended when the stake changes, including when it falls below 5%.
Every row here is one of those filings, linked to the filing itself. Percentages and share counts are exactly as the holder filed them, for the holder the filing names; an amendment showing a lower figure is shown as filed. Item 4 text is quoted word for word. Where a 13D's Item 4 contains a sentence stating a definite intent to influence the company, that sentence is marked and quoted; the page does not describe the holder or its motives beyond the words it filed. Nothing here is investment advice.