First Light Asset Management, LLC and Mathew P. Arens have disclosed significant passive ownership stakes in 908 Devices Inc. First Light reports beneficial ownership of 5,964,739 common shares, representing 16.48% of the company. Arens reports beneficial ownership of 6,184,739 shares, or 17.09% of the class.
The filing explains that First Light holds shares as an investment adviser to separately managed accounts and private funds, while Arens controls First Light and also owns additional shares directly and in joint accounts. They certify the holdings are in the ordinary course of business and not for the purpose of influencing control of 908 Devices.
Positive
None.
Negative
None.
Insights
Large passive holder reports a 17% stake in 908 Devices.
First Light Asset Management and its controller Mathew P. Arens report beneficial ownership of 16.48% and 17.09% of 908 Devices common stock, respectively, under a Schedule 13G/A, which is used for passive, non‑control positions.
The disclosure clarifies voting and dispositive powers: First Light’s 5,964,739 shares are entirely subject to shared voting and disposition, while Arens adds 70,000 shares he controls solely and additional jointly held shares. This indicates a concentrated but formally passive institutional stake.
The certification states the securities are held in the ordinary course of business and not to change or influence control of 908 Devices. Future ownership updates would typically appear in subsequent beneficial ownership reports if their percentage meaningfully changes.
SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549
SCHEDULE 13G
UNDER THE SECURITIES EXCHANGE ACT OF 1934
(Amendment No. 2)
908 Devices Inc.
(Name of Issuer)
Common Stock, $0.001 par value
(Title of Class of Securities)
65443P102
(CUSIP Number)
12/31/2025
(Date of Event Which Requires Filing of this Statement)
Check the appropriate box to designate the rule pursuant to which this Schedule is filed:
Rule 13d-1(b)
Rule 13d-1(c)
Rule 13d-1(d)
SCHEDULE 13G
CUSIP No.
65443P102
1
Names of Reporting Persons
First Light Asset Management, LLC
2
Check the appropriate box if a member of a Group (see instructions)
(a)
(b)
3
Sec Use Only
4
Citizenship or Place of Organization
DELAWARE
Number of Shares Beneficially Owned by Each Reporting Person With:
5
Sole Voting Power
0.00
6
Shared Voting Power
5,964,739.00
7
Sole Dispositive Power
0.00
8
Shared Dispositive Power
5,964,739.00
9
Aggregate Amount Beneficially Owned by Each Reporting Person
5,964,739.00
10
Check box if the aggregate amount in row (9) excludes certain shares (See Instructions)
11
Percent of class represented by amount in row (9)
16.48 %
12
Type of Reporting Person (See Instructions)
IA
SCHEDULE 13G
CUSIP No.
65443P102
1
Names of Reporting Persons
Mathew P. Arens
2
Check the appropriate box if a member of a Group (see instructions)
(a)
(b)
3
Sec Use Only
4
Citizenship or Place of Organization
UNITED STATES
Number of Shares Beneficially Owned by Each Reporting Person With:
5
Sole Voting Power
70,000.00
6
Shared Voting Power
6,114,739.00
7
Sole Dispositive Power
70,000.00
8
Shared Dispositive Power
6,114,739.00
9
Aggregate Amount Beneficially Owned by Each Reporting Person
6,184,739.00
10
Check box if the aggregate amount in row (9) excludes certain shares (See Instructions)
11
Percent of class represented by amount in row (9)
17.09 %
12
Type of Reporting Person (See Instructions)
IN
SCHEDULE 13G
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:
This Schedule 13G is jointly filed by the following:
First Light Asset Management, LLC (the "Manager")
Mathew P. Arens ("Mr. Arens")
The Manager may be deemed to be the beneficial owner of 5,964,739 of the Issuer's shares of common stock (the "Shares"). The Manager acts as an investment adviser to certain persons holding separately managed accounts with the Manager, each of whom has the right to receive or the power to direct the receipt of dividends from, or the proceeds from the sale of, those shares. The Manager may also be deemed to be the beneficial owner of these shares because it acts as an investment adviser to certain private funds. Mr. Arens may also be deemed to be the beneficial owner of these shares because he controls the Manager in his position as managing member and majority owner of the Manager. Mr. Arens also directly holds 70,000 Shares in an individual capacity with sole control and 150,000 Shares held in joint accounts over which he shares control. The Manager and Mr. Arens are filing this Schedule 13G/A with respect to these Shares pursuant to Rule 13d-1(b) under the Act.
The Manager and Mr. Arens may be deemed to be the beneficial owner of the total amount of Shares set forth across from its or his respective name in Item 4 below. The filing of this Schedule 13G shall not be construed as an admission that the reporting persons or any of their affiliates are the beneficial owner of any securities covered by this Schedule 13G for any other purposes other than Section 13(d) of the Securities Exchange Act of 1934.
(b)
Address or principal business office or, if none, residence:
Each of the reporting persons identified in Item 2(a) has its principal business office at:
3300 Edinborough Way, Suite 201, Edina, MN 55435
(c)
Citizenship:
First Light Asset Management, LLC - Delaware limited liability company
Mathew P. Arens - United States citizen
(d)
Title of class of securities:
Common Stock, $0.001 par value
(e)
CUSIP No.:
65443P102
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:
First Light Asset Management, LLC - 5,964,739
Mathew P. Arens - 6,184,739
(b)
Percent of class:
First Light Asset Management, LLC - 16.48%
Mathew P. Arens - 17.09%
(c)
Number of shares as to which the person has:
(i) Sole power to vote or to direct the vote:
First Light Asset Management, LLC - 0
Mathew P. Arens - 70,000
(ii) Shared power to vote or to direct the vote:
First Light Asset Management, LLC - 5,964,739
Mathew P. Arens - 6,114,739
(iii) Sole power to dispose or to direct the disposition of:
First Light Asset Management, LLC - 0
Mathew P. Arens - 70,000
(iv) Shared power to dispose or to direct the disposition of:
First Light Asset Management, LLC - 5,964,739
Mathew P. Arens - 6,114,739
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
Item 10.
Certifications:
By signing below I certify that, to the best of my knowledge and belief, the securities referred to above were acquired and are held in the ordinary course of business and were not acquired and are not held for the purpose of or with the effect of changing or influencing the control of the issuer of the securities and were not acquired and are not held in connection with or as a participant in any transaction having that purpose or effect, other than activities solely in connection with a nomination under ?? 240.14a-11.
SIGNATURE
After reasonable inquiry and to the best of my knowledge and belief, I certify that the information set forth in this statement is true, complete and correct.
What ownership stake in 908 Devices Inc. (MASS) does First Light report?
First Light Asset Management reports beneficial ownership of 5,964,739 shares of 908 Devices common stock. This represents 16.48% of the outstanding class, based on the company’s shares. The position is reported on a passive Schedule 13G/A filing.
How many 908 Devices (MASS) shares does Mathew P. Arens beneficially own?
Mathew P. Arens reports beneficial ownership of 6,184,739 908 Devices shares, or 17.09% of the class. This includes shares attributed through his control of First Light Asset Management plus 70,000 shares he holds directly and additional shares in joint accounts.
Is First Light’s 908 Devices (MASS) position considered passive or active?
The position is reported on a Schedule 13G/A, which is used for passive holdings. The filers certify the securities were acquired and are held in the ordinary course of business, not for changing or influencing control of 908 Devices.
Who controls the 908 Devices (MASS) shares reported by First Light?
First Light Asset Management acts as investment adviser to separately managed accounts and private funds that hold the shares. Mathew P. Arens, as managing member and majority owner of First Light, may be deemed to beneficially own those same shares through his control.
How are voting and dispositive powers over 908 Devices (MASS) shares allocated?
First Light reports 0 shares with sole voting or dispositive power and 5,964,739 with shared power. Arens reports sole voting and dispositive power over 70,000 shares and shared power over 6,114,739 shares, reflecting his control over First Light and certain joint accounts.
Does any other person have rights to 908 Devices (MASS) shares held by First Light?
The filing notes First Light advises persons with separately managed accounts and certain private funds. These clients have the right to receive, or direct the receipt of, dividends or sale proceeds from their shares, while First Light and Arens are deemed beneficial owners for reporting purposes.
