# EDGAR Filing Document

**Accession Number:** 0001555279
**File Stem:** 0001617236-26-000003
**Filing Date:** 2026-3
**Character Count:** 5083
**Document Hash:** ea15510569f66529788e28d985835631
**Contains OCR:** False
**Source Format:** 

## Filing Content

## Filing Summary
**0001617236-26-000003.hdr.sgml**: 20260305

**ACCESSION NUMBER**: 0001617236-26-000003

**CONFORMED SUBMISSION TYPE**: 3

**PUBLIC DOCUMENT COUNT**: 1

**CONFORMED PERIOD OF REPORT**: 20260226

**FILED AS OF DATE**: 20260305

**DATE AS OF CHANGE**: 20260305

**REPORTING-OWNER**: 

**OWNER DATA:**
- **COMPANY CONFORMED NAME:** Levine Mark S.
- **CENTRAL INDEX KEY:** 0001617236

**ORGANIZATION NAME:**

**FILING VALUES:**
- **FORM TYPE:** 3
- **SEC ACT:** 1934 Act
- **SEC FILE NUMBER:** 001-39815
- **FILM NUMBER:** 26727033

**MAIL ADDRESS:**
- **STREET 1:** 1601 TRAPELO ROAD
- **STREET 2:** SUITE 284
- **CITY:** WALTHAM
- **STATE:** MA
- **ZIP:** 02451
**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:** 44 THIRD AVENUE
- **CITY:** BURLINGTON
- **STATE:** MA
- **ZIP:** 01803
- **BUSINESS PHONE:** 978-729-4478

**MAIL ADDRESS:**
- **STREET 1:** 44 THIRD AVENUE
- **CITY:** BURLINGTON
- **STATE:** MA
- **ZIP:** 01803

### 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>Levine Mark S.<br><sub>(Last) (First) (Middle)</sub><br>C/O 908 DEVICES INC.<br>44 3RD AVENUE<br><sub>(Street)</sub><br>BURLINGTON, MA 01803<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>2026-02-26 | **4. Relationship of Reporting Person(s) to Issuer**<br>(Check all applicable)<br>[ ] Director   [ ] 10% Owner<br>[X] Officer (give title below)   [ ] Other (specify below)<br>_Chief Legal and Admin. Officer_ | **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 |

---

## 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 (right to buy) | <sup>(1)</sup> | 2035-12-07 | Common Stock | 130468 | $6.68 | D |  |
| Restricted Stock Units | <sup>(2)</sup> | <sup>(2)</sup> | Common Stock | 98242 | <sup>(3)</sup> | D |  |

---

### Footnotes:

(1) One-third of the shares underlying the option become vested and exercisable on January 1, 2027, and the remaining two-thirds of the shares underlying the option become vested and exercisable in substantially equal monthly installments over the 24 months following January 1, 2027, subject to the reporting person's continued service through the applicable vesting date.

(2) These restricted stock units ("RSUs") vest in three substantially equal annual installments at the three anniversary dates following January 1, 2026, subject to the reporting person's continued service through the applicable vesting date. The RSUs have no expiration date.

(3) Each RSU represents a contingent right to receive one share of Common Stock, par value $0.001, when vested.

**Signature:** /s/ Mark S. Levine  
**Date:** 2026-03-05

### 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.**