| Item 1. | |
| (a) | Name of issuer:
908 Devices Inc. |
| (b) | Address of issuer's principal executive offices:
44 Third Avenue, Burlington, MA 01803 |
| Item 2. | |
| (a) | Name of person filing:
ARCH Venture Fund VII, L.P. ("ARCH Venture Fund VII"); ARCH Venture Partners VII, L.P. ("AVP VII LP"); ARCH Venture Partners VII, LLC ("AVP VII LLC") (collectively, the "Reporting Entities" and individually, each a "Reporting Entity"); and Keith Crandell ("Crandell"), Robert Nelsen ("Nelsen") and Clinton Bybee ("Bybee") (collectively, the "Managing Directors" and individually, each a "Managing Director"). The Reporting Entities and the Managing Directors collectively are referred to as the "Reporting Persons". The Reporting Persons are filing this report with respect to shares of Common Stock, par value $0.001 per share (the "Common Stock") of 908 Devices Inc. (the "Issuer"). |
| (b) | Address or principal business office or, if none, residence:
8755 W. Higgins Avenue, Suite 1025, Chicago, IL 60631 |
| (c) | Citizenship:
ARCH Venture Fund VII and AVP VII LP are limited partnerships organized under the laws of the State of Delaware. AVP VII LLC is a limited liability company organized under the laws of the State of Delaware. Each Managing Director is a US citizen. |
| (d) | Title of class of securities:
Common Stock par value $0.001 per share |
| (e) | CUSIP No.:
|
| Item 3. | If this statement is filed pursuant to §§ 240.13d-1(b) or 240.13d-2(b) or (c), check whether the person filing is a: |
| (a) |  Broker or dealer registered under section 15 of the Act (15 U.S.C. 78o);
|
| (b) | Bank as defined in section 3(a)(6) of the Act (15 U.S.C. 78c);
|
| (c) | Insurance company as defined in section 3(a)(19) of the Act (15 U.S.C. 78c);
|
| (d) | Investment company registered under section 8 of the Investment Company Act of 1940 (15 U.S.C. 80a-8);
|
| (e) | An investment adviser in accordance with § 240.13d-1(b)(1)(ii)(E);
|
| (f) | An employee benefit plan or endowment fund in accordance with § 240.13d-1(b)(1)(ii)(F);
|
| (g) | A parent holding company or control person in accordance with § 240.13d-1(b)(1)(ii)(G);
|
| (h) | A savings associations as defined in Section 3(b) of the Federal Deposit Insurance Act (12 U.S.C. 1813);
|
| (i) | A church plan that is excluded from the definition of an investment company under section 3(c)(14) of the Investment Company Act of 1940 (15 U.S.C. 80a-3);
|
| (j) | A non-U.S. institution in accordance with § 240.13d-1(b)(1)(ii)(J). If filing as a non-U.S. institution in accordance with § 240.13d-1(b)(1)(ii)(J),
please specify the type of institution:
|
| (k) | Group, in accordance with Rule 240.13d-1(b)(1)(ii)(K).
|
| | |
| Item 4. | Ownership |
| (a) | Amount beneficially owned:
ARCH Venture Fund VII is the record owner of 5,725,045 shares of Common Stock (the "Record Shares") as of March 31, 2026. AVP VII LP, as the sole general partner of ARCH Venture Fund VII, may be deemed to beneficially own the Record Shares. AVP VII LLC, as the sole general partner of AVP VII, may be deemed to beneficially own the Record Shares. As managing directors of AVP VII LLC, each Managing Director may also be deemed to share the power to direct the disposition and vote of the Record Shares.
In addition, as of March 31, 2026, Crandell is a holder of vested options to purchase 57,794 shares of Common Stock (the "Vested Option Shares"), 25,291 fully vested restricted stock units ("RSUs"), and options to purchase 1,086 shares of Common Stock vesting within sixty days (the "Unvested Option Shares").
The information required by Item 4(b) is incorporated by reference to Row 11 of the cover pages hereto. The percentage set forth on the cover sheet for each Reporting Person is based upon 37,813,621 shares of Common Stock outstanding as of May 4, 2026, as reported on the Issuer's Quarterly Report on Form 10-Q as filed with the Securities and Exchange Commission on May 6, 2026, and in the case of Crandell, assumes the issuance of the Vested Option Shares, shares underlying the RSUs, and the Unvested Option Shares.
Each Reporting Person disclaims beneficial ownership of such shares of Common Stock except for the shares, if any, such Reporting Person holds of record. |
| (b) | Percent of class:
See row 11 of the cover pages. |
| (c) | Number of shares as to which the person has:
|
| | (i) Sole power to vote or to direct the vote:
See row 5 of the cover pages.
|
| | (ii) Shared power to vote or to direct the vote:
See row 6 of the cover pages.
|
| | (iii) Sole power to dispose or to direct the disposition of:
See row 7 of the cover pages.
|
| | (iv) Shared power to dispose or to direct the disposition of:
See row 8 of the cover pages.
|
| Item 5. | Ownership of 5 Percent or Less of a Class. |
| |
Not Applicable
|
| Item 6. | Ownership of more than 5 Percent on Behalf of Another Person. |
| |
Not Applicable
|
| Item 7. | Identification and Classification of the Subsidiary Which Acquired the Security Being Reported on by the Parent Holding Company or Control Person. |
| |
Not Applicable
|
| Item 8. | Identification and Classification of Members of the Group. |
| |
Not Applicable
|
| Item 9. | Notice of Dissolution of Group. |
| |
Not Applicable
|
Rule 13d-1(d)