# EDGAR Filing Document

**Accession Number:** 0001836988
**File Stem:** 0001562180-25-004949
**Filing Date:** 2025-6
**Character Count:** 7235
**Document Hash:** 0c1886de98d573f7e1079367b03c6483
**Contains OCR:** False
**Source Format:** 

## Filing Content

## Filing Summary
**0001562180-25-004949.hdr.sgml**: 20250618

**ACCESSION NUMBER**: 0001562180-25-004949

**CONFORMED SUBMISSION TYPE**: 3

**PUBLIC DOCUMENT COUNT**: 1

**CONFORMED PERIOD OF REPORT**: 20250613

**FILED AS OF DATE**: 20250618

**DATE AS OF CHANGE**: 20250618

**REPORTING-OWNER**: 

**OWNER DATA:**
- **COMPANY CONFORMED NAME:** Brown Christopher D.
- **CENTRAL INDEX KEY:** 0001836988

**ORGANIZATION NAME:**

**FILING VALUES:**
- **FORM TYPE:** 3
- **SEC ACT:** 1934 Act
- **SEC FILE NUMBER:** 001-39815
- **FILM NUMBER:** 251057450

**MAIL ADDRESS:**
- **STREET 1:** C/O 908 DEVICES INC.
- **STREET 2:** 645 SUMMER STREET
- **CITY:** BOSTON
- **STATE:** MA
- **ZIP:** 02210
**ISSUER**: 

**COMPANY DATA:**
- **COMPANY CONFORMED NAME:** 908 Devices Inc.
- **CENTRAL INDEX KEY:** 0001555279
- **STANDARD INDUSTRIAL CLASSIFICATION:** MEASURING & CONTROLLING DEVICES, NEC [3829]
- **ORGANIZATION NAME:** 08 Industrial Applications and Services
- **EIN:** 454524096
- **STATE OF INCORPORATION:** DE
- **FISCAL YEAR END:** 1231

**BUSINESS ADDRESS:**
- **STREET 1:** 645 SUMMER STREET
- **CITY:** BOSTON
- **STATE:** MA
- **ZIP:** 02210
- **BUSINESS PHONE:** 978-729-4478

**MAIL ADDRESS:**
- **STREET 1:** 645 SUMMER STREET
- **CITY:** BOSTON
- **STATE:** MA
- **ZIP:** 02210

### UNITED STATES SECURITIES AND EXCHANGE COMMISSION
**Washington, D.C. 20549**

## FORM 3

### INITIAL STATEMENT OF BENEFICIAL OWNERSHIP OF SECURITIES

[ ] Check this box if no longer subject to Section 16. Form 4 or Form 5 obligations may continue. See Instruction 1(b).

---

| | | |
|:---|:---|:---|
| **1. Name and Address of Reporting Person**<sup>*</sup><br>Brown Christopher D.<br><sub>(Last) (First) (Middle)</sub><br>C/O 908 DEVICES INC.<br>645 SUMMER STREET<br><sub>(Street)</sub><br>BOSTON, MA 02210<br><sub>(City) (State) (Zip)</sub> | **3. Issuer Name and Ticker or Trading Symbol**<br>908 Devices Inc. [ MASS ] | **5. If Amendment, Date of Original Filed (Month/Day/Year)**<br>  |
| **2. Date of Event Requiring Statement (Month/Day/Year)**<br>2025-06-13 | **4. Relationship of Reporting Person(s) to Issuer**<br>(Check all applicable)<br>[X] Director   [ ] 10% Owner<br>[ ] Officer (give title below)   [ ] Other (specify below)<br>_ _ | **6. Individual or Joint/Group Filing (Check Applicable Line)**<br>[X] Form filed by One Reporting Person<br>[ ] Form filed by More than One Reporting Person |

---

## Table I - Non-Derivative Securities Beneficially Owned

---

|  |  |  |  |
| --- | --- | --- | --- |
| 1. Title of Security | 2. Amount of Securities Beneficially Owned | 3. Ownership Form | 4. Nature of Indirect Beneficial Ownership |
| Common Stock | 962122.00 | D |  |

---

## Table II - Derivative Securities Beneficially Owned

---

|  |  |  |  |  |  |  |  |
| --- | --- | --- | --- | --- | --- | --- | --- |
| 1. Title of Derivative Security | 2. Date Exercisable and Expiration Date (Month/Day/Year) | 2. Date Exercisable and Expiration Date (Month/Day/Year) | 3. Title and Amount of Underlying Securities | 3. Title and Amount of Underlying Securities | 4. Conversion or Exercise Price | 5. Ownership Form | 6. Nature of Indirect Beneficial Ownership |
| 1. Title of Derivative Security | Date Exercisable | Expiration Date | Title | Amount or Number of Shares | 4. Conversion or Exercise Price | 5. Ownership Form | 6. Nature of Indirect Beneficial Ownership |
| Stock Option (option to buy) | <sup>(1)</sup> | 2027-06-22 | Common Stock | 114318.00 | $1.75 | D |  |
| Stock Option (option to buy) | <sup>(1)</sup> | 2030-09-21 | Common Stock | 67604.00 | $3.24 | D |  |
| Stock Option (option to buy) | <sup>(2)</sup> | 2032-03-01 | Common Stock | 33400.00 | $16.66 | D |  |
| Stock Option (option to buy) | <sup>(3)</sup> | 2033-02-28 | Common Stock | 45018.00 | $8.83 | D |  |
| Stock Option (option to buy) | <sup>(4)</sup> | 2034-02-28 | Common Stock | 60064.00 | $7.35 | D |  |
| Restricted Stock Units | <sup>(6)</sup> | <sup>(6)</sup> | Common Stock | 5027.00 | <sup>(5)</sup> | D |  |
| Restricted Stock Units | <sup>(7)</sup> | <sup>(7)</sup> | Common Stock | 14836.00 | <sup>(5)</sup> | D |  |
| Restricted Stock Units | <sup>(8)</sup> | <sup>(8)</sup> | Common Stock | 32974.00 | <sup>(5)</sup> | D |  |

---

### Footnotes:

(1) The shares underlying the option are fully vested and immediately exercisable.

(2) Twenty-five percent of the shares underlying the option become vested and exercisable on February 1, 2023, and the remaining 75% of the shares underlying the option become vested and exercisable in substantially equal monthly installments over the 36 months following February 1, 2023, subject to the reporting person's continued service through the applicable vesting date.

(3) Twenty-five percent of the shares underlying the option become vested and exercisable on February 1, 2024, and the remaining 75% of the shares underlying the option become vested and exercisable in substantially equal monthly installments over the 36 months following February 1, 2024, subject to the reporting person's continued service through the applicable vesting date.

(4) Twenty-five percent of the shares underlying the option become vested and exercisable on February 1, 2025, and the remaining 75% of the shares underlying the option become vested and exercisable in substantially equal monthly installments over the 36 months following February 1, 2025, subject to the reporting person's continued service through the applicable vesting date.

(5) Each Restricted Stock Unit ("RSU") represents a contingent right to receive one share of Common Stock, par value $0.001, when vested. This transaction represents the settlement of RSUs in shares of Common Stock on their scheduled vesting date.

(6) These RSUs vest in four substantially equal annual installments at the four anniversary dates following February 1, 2022, subject to the reporting person's continued service through the applicable vesting date. The RSUs have no expiration date.

(7) These RSUs vest in four substantially equal annual installments at the four anniversary dates following February 1, 2023, subject to the reporting person's continued service through the applicable vesting date. The RSUs have no expiration date.

(8) These RSUs vest in four substantially equal annual installments at the four anniversary dates following February 1, 2024, subject to the reporting person's continued service through the applicable vesting date. The RSUs have no expiration date.

**Signature:** /s/ Michael S. Turner, as Attorney-in-Fact  
**Date:** 2025-06-18

### Remarks:

Reminder: Report on a separate line for each class of securities beneficially owned directly or indirectly.

* If the form is filed by more than one reporting person, see Instruction 4 (b)(v).

** Intentional misstatements or omissions of facts constitute Federal Criminal Violations See 18 U.S.C. 1001 and 15 U.S.C. 78ff(a).

Note: File three copies of this Form, one of which must be manually signed. If space is insufficient, see Instruction 6 for procedure.

**Persons who respond to the collection of information contained in this form are not required to respond unless the form displays a currently valid OMB Number.**