ARK and Cathie Wood report 1.88M shares in 908 Devices (MASS)

Rhea-AI Filing Summary

908 Devices Inc. reports a beneficial ownership filing showing ownership of 1,883,206 shares of Common Stock, representing 4.94% of the class. The filing lists ARK Investment Management LLC and Catherine D. Wood as holders of the 1,883,206 shares, with signature dates of 06/05/2026.

The filing is a Schedule 13G/A and is labeled "Ownership of 5 Percent or Less of a Class." It discloses voting and dispositive power split: ARK holds sole voting and dispositive power for 1,883,206 shares while Catherine D. Wood holds shared voting and dispositive power for the same amount.

Insights

Securities Compliance Analyst

Schedule 13G/A lists passive beneficial ownership of 4.94%.

The filing identifies ARK Investment Management LLC and Catherine D. Wood as beneficial holders of 1,883,206 shares with specific voting and dispositive power allocations. The filing is signed on 06/05/2026 and is categorized under "Ownership of 5 Percent or Less of a Class."

Because this is a Schedule 13G/A disclosure, it is a passive reporting mechanism under exchange rules; subsequent filings would report material changes if ownership crosses thresholds or the holder changes its status.

Equity Markets Analyst

Holding equals a minority stake below the 5% reporting threshold trigger for larger disclosures.

The record shows 1,883,206 shares and 4.94% beneficial ownership; ARK is shown with sole voting/dispositive power while Catherine D. Wood is shown with shared powers. The CUSIP noted is 65443P102.

Market impact is typically limited for Schedule 13G/A entries at this scale; any material change would require an amended filing reflecting a different ownership percentage or change in intent.

Key Figures

Shares beneficially owned: 1,883,206 shares Percent of class: 4.94% Signature date: 06/05/2026 +1 more

4 metrics

Shares beneficially owned 1,883,206 shares Amount reported by ARK and Catherine D. Wood

Percent of class 4.94% Percent of common stock as stated in Item 4(a)/(b)

Signature date 06/05/2026 Filing signed by Kellen Carter and Catherine D. Wood

CUSIP 65443P102 CUSIP for 908 Devices common stock as listed on the filing

Key Terms

Schedule 13G/A, Beneficial ownership, Sole/Shared dispositive power

3 terms

Schedule 13G/A regulatory

"Item 1. ... (a) Name of issuer: 908 Devices Inc."

A Schedule 13G/A is an amended public filing with the U.S. securities regulator that updates a previous Schedule 13G, disclosing when an individual or group holds a substantial (typically over 5%) stake in a company and is claiming a passive, non‑controlling intent. Investors monitor these updates because rising or falling holdings can signal changing confidence, potential future moves, or shifts in voting power — like watching a public ledger where large shareholders quietly adjust their positions.

Beneficial ownership regulatory

"Item 4. | Ownership (a) | Amount beneficially owned: ARK ... 1,883,206"

Beneficial ownership means the person or entity that actually enjoys the benefits of owning shares or other assets — such as receiving dividends, voting rights, or price gains — even if the legal title is held in another name. For investors it matters because knowing who truly controls and profits from a company reveals who can influence decisions, exposes potential conflicts of interest or hidden concentration of power, and affects transparency and risk in the stock.

Sole/Shared dispositive power regulatory

"Item 4. ... (iii) Sole power to dispose ... (iv) Shared power to dispose ..."

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SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

SCHEDULE 13G

UNDER THE SECURITIES EXCHANGE ACT OF 1934

(Amendment No. 8)

908 Devices Inc.

(Name of Issuer)

Common Stock

(Title of Class of Securities)

65443P102

(CUSIP Number)

05/31/2026

(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)

schemaVersion:

SCHEDULE 13G

CUSIP Number(s): 65443P102

1

Names of Reporting Persons

ARK Investment 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 1,883,206.00
6	Shared Voting Power 0.00
7	Sole Dispositive Power 1,883,206.00
8	Shared Dispositive Power 0.00

9

Aggregate Amount Beneficially Owned by Each Reporting Person

1,883,206.00

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)

4.94 %

12

Type of Reporting Person (See Instructions)

IA

SCHEDULE 13G

CUSIP Number(s): 65443P102

1

Names of Reporting Persons

Catherine D. Wood

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 0.00
6	Shared Voting Power 1,883,206.00
7	Sole Dispositive Power 0.00
8	Shared Dispositive Power 1,883,206.00

9

Aggregate Amount Beneficially Owned by Each Reporting Person

1,883,206.00

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)

4.94 %

12

Type of Reporting Person (See Instructions)

HC, 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: (i) ARK Investment Management LLC ("ARK") (ii) Catherine D. Wood
(b)	Address or principal business office or, if none, residence: ARK and Catherine D. Wood: 200 Central Avenue, St. Petersburg, FL 33701
(c)	Citizenship: (i) ARK: Delaware (ii) Catherine D. Wood: United States
(d)	Title of class of securities: Common Stock
(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: ARK and Catherine D. Wood: 1,883,206
(b)	Percent of class: ARK and Catherine D. Wood: 4.94
(c)	Number of shares as to which the person has:
	(i) Sole power to vote or to direct the vote: (i) ARK: 1,883,206 (ii) Catherine D. Wood: 0
	(ii) Shared power to vote or to direct the vote: (i) ARK: 0 (ii) Catherine D. Wood: 1,883,206
	(iii) Sole power to dispose or to direct the disposition of: (i) ARK: 1,883,206 (ii) Catherine D. Wood: 0
	(iv) Shared power to dispose or to direct the disposition of: (i) ARK: 0 (ii) Catherine D. Wood: 1,883,206
Item 5.	Ownership of 5 Percent or Less of a Class.
	Ownership of 5 percent or less of a class
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.

ARK Investment Management LLC

Signature:	/s/ Kellen Carter
Name/Title:	Kellen Carter, Chief Compliance Officer
Date:	06/05/2026

Catherine D. Wood

Signature:	/s/ Catherine D. Wood
Name/Title:	Catherine D. Wood, Chief Executive Officer, Chief Investment Officer
Date:	06/05/2026

FAQ

What stake does ARK Investment Management report in 908 Devices (MASS)?

ARK reports beneficial ownership of 1,883,206 shares, equal to 4.94% of common stock. The filing is a Schedule 13G/A signed on 06/05/2026 and is labeled "Ownership of 5 Percent or Less of a Class."

Who is listed alongside ARK in the 908 Devices filing?

Catherine D. Wood is listed alongside ARK Investment Management LLC as a reporting person. The filing attributes shared voting and dispositive power to Catherine D. Wood over the same 1,883,206 shares shown in the filing.

What voting and dispositive powers are disclosed in the Schedule 13G/A?

The filing shows ARK has sole voting and sole dispositive power over 1,883,206 shares, while Catherine D. Wood has shared voting and shared dispositive power for the same share count, per the ownership table.

Does this Schedule 13G/A indicate active trading or change in intent?

The filing is presented under the heading "Ownership of 5 Percent or Less of a Class," which reflects a passive reporting status. It does not, by itself, state an active trading intent or change in investment purpose.