Citadel Advisors and affiliated entities report beneficial ownership in Momentus Inc. Class A common stock. The joint Schedule 13G discloses that Citadel Advisors LLC, Citadel Advisors Holdings LP and Citadel GP LLC each may be deemed to beneficially own 634,285 shares (reported as 9.97% of outstanding shares). Mr. Kenneth Griffin is reported as a related reporting person with 635,792 shares (9.99%). The filing states total shares outstanding of 6,364,291 as the basis for percentages and notes 184,285 shares issuable upon conversion of certain warrants subject to a 9.99% beneficial ownership limit.
The statement clarifies voting and dispositive power are shared for the disclosed holdings and that the filing is joint; customary disclaimers about constructive beneficial ownership are included.
Positive
None.
Negative
None.
Key Figures
Shares outstanding used for percentages:6,364,291 sharesReported holdings per Citadel Advisors entities:634,285 sharesKenneth Griffin reported holdings:635,792 shares+4 more
7 metrics
Shares outstanding used for percentages6,364,291 sharesbasis for percentage calculations stated in the filing
Reported holdings per Citadel Advisors entities634,285 shareseach for Citadel Advisors LLC, Citadel Advisors Holdings LP, Citadel GP LLC
Kenneth Griffin reported holdings635,792 sharesreported beneficial ownership attributed to Mr. Griffin
Percent of class for Citadel entities9.97%percentage reported for 634,285-share holdings
Percent of class for Kenneth Griffin9.99%percentage reported for 635,792-share holdings
Warrants issuable noted184,285 sharesshares issuable upon conversion of certain warrants held by affiliates
Citadel Securities holdings shown1,507 sharesCitadel Securities LLC and related entities reported 1,507 shares (0.02%)
"This is being jointly filed by Citadel Advisors LLC... (Schedule 13G filing context)"
A Schedule 13G is a formal document that investors file with the government when they acquire a large ownership stake in a company, usually for investment purposes rather than control. It helps keep the public informed about who owns significant parts of a company's shares, which can influence how the company is managed and how investors make decisions. Filing this schedule is important for transparency and understanding the ownership landscape of publicly traded companies.
beneficially ownfinancial
"Each of Citadel Advisors LLC... may be deemed to beneficially own 634,285 Shares"
Beneficially own means having the economic rights and risks of a security—such as the right to receive dividends, sell the shares, or profit from price changes—whether or not your name appears on the official share register. Think of it like renting a car: you use it and reap the benefits even if the title lists someone else. Investors care because beneficial ownership determines who truly controls value, must be disclosed under securities rules, and can signal potential influence or trading activity that affects a stock’s price.
shared dispositive powerregulatory
"Shared Dispositive Power 634,285.00"
warrants issuablefinancial
"184,285 Shares issuable upon conversion of certain warrants"
SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549
SCHEDULE 13G
UNDER THE SECURITIES EXCHANGE ACT OF 1934
Momentus Inc.
(Name of Issuer)
Class A common stock, par value $0.00001 per share (the "Shares")
(Title of Class of Securities)
60879E408
(CUSIP Number)
04/15/2026
(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):
60879E408
1
Names of Reporting Persons
Citadel Advisors 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
634,285.00
7
Sole Dispositive Power
0.00
8
Shared Dispositive Power
634,285.00
9
Aggregate Amount Beneficially Owned by Each Reporting Person
634,285.00
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)
9.97 %
12
Type of Reporting Person (See Instructions)
IA, HC, OO
Comment for Type of Reporting Person: The percentages reported in this Schedule 13G are based upon 6,364,291 Shares outstanding comprised of (i) 5,730,006 Shares outstanding as of March 27, 2026 (according to the issuer's Form 10-K as filed with the Securities and Exchange Commission on April 10, 2026), (ii) 450,000 Shares issued in a private placement on April 15, 2025 (according to the issuer's Form 8-K as filed with the Securities and Exchange Commission on April 16, 2026), and (iii) 184,285 Shares issuable upon conversion of certain warrants held by affiliates of the reporting persons. Except as described in the preceding sentence, all Shares for the holdings of the reporting persons reported in this Schedule 13G are as of the opening of the market on April 22, 2026. The warrants described in clause (iii) are subject to terms that limit exercise, if, after such exercise, the holder and its affiliates would beneficially own more than 9.99% of the number of the Shares outstanding immediately after exercise.
SCHEDULE 13G
CUSIP Number(s):
60879E408
1
Names of Reporting Persons
Citadel Advisors Holdings LP
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
634,285.00
7
Sole Dispositive Power
0.00
8
Shared Dispositive Power
634,285.00
9
Aggregate Amount Beneficially Owned by Each Reporting Person
634,285.00
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)
9.97 %
12
Type of Reporting Person (See Instructions)
HC, PN
SCHEDULE 13G
CUSIP Number(s):
60879E408
1
Names of Reporting Persons
Citadel GP 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
634,285.00
7
Sole Dispositive Power
0.00
8
Shared Dispositive Power
634,285.00
9
Aggregate Amount Beneficially Owned by Each Reporting Person
634,285.00
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)
9.97 %
12
Type of Reporting Person (See Instructions)
HC, OO
SCHEDULE 13G
CUSIP Number(s):
60879E408
1
Names of Reporting Persons
Citadel Securities 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
1,507.00
7
Sole Dispositive Power
0.00
8
Shared Dispositive Power
1,507.00
9
Aggregate Amount Beneficially Owned by Each Reporting Person
1,507.00
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)
0.02 %
12
Type of Reporting Person (See Instructions)
BD, OO
SCHEDULE 13G
CUSIP Number(s):
60879E408
1
Names of Reporting Persons
Citadel Securities Group LP
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
1,507.00
7
Sole Dispositive Power
0.00
8
Shared Dispositive Power
1,507.00
9
Aggregate Amount Beneficially Owned by Each Reporting Person
1,507.00
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)
0.02 %
12
Type of Reporting Person (See Instructions)
HC, PN
SCHEDULE 13G
CUSIP Number(s):
60879E408
1
Names of Reporting Persons
Citadel Securities GP 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
1,507.00
7
Sole Dispositive Power
0.00
8
Shared Dispositive Power
1,507.00
9
Aggregate Amount Beneficially Owned by Each Reporting Person
1,507.00
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)
0.02 %
12
Type of Reporting Person (See Instructions)
HC, OO
SCHEDULE 13G
CUSIP Number(s):
60879E408
1
Names of Reporting Persons
Kenneth Griffin
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
635,792.00
7
Sole Dispositive Power
0.00
8
Shared Dispositive Power
635,792.00
9
Aggregate Amount Beneficially Owned by Each Reporting Person
635,792.00
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)
9.99 %
12
Type of Reporting Person (See Instructions)
HC, IN
SCHEDULE 13G
Item 1.
(a)
Name of issuer:
Momentus Inc.
(b)
Address of issuer's principal executive offices:
1762 Automation Parkway, San Jose, CA, 95131
Item 2.
(a)
Name of person filing:
This Schedule 13G is being jointly filed by Citadel Advisors LLC ("Citadel Advisors"), Citadel Advisors Holdings LP ("CAH"), Citadel GP LLC ("CGP"), Citadel Securities LLC ("Citadel Securities"), Citadel Securities Group LP ("CALC4"), Citadel Securities GP LLC ("CSGP") and Mr. Kenneth Griffin (collectively with Citadel Advisors, CAH, CGP, Citadel Securities, CALC4 and CSGP, the "Reporting Persons") with respect to the Shares of the above-named issuer owned by Citadel CEMF Investments Ltd., a Cayman Islands limited company ("CCIL"), and Citadel Securities. Such owned Shares may include other instruments exercisable for or convertible into Shares.
Citadel Advisors is the portfolio manager for CCIL. CAH is the sole member of Citadel Advisors. CGP is the general partner of CAH. CALC4 is the non-member manager of Citadel Securities. CSGP is the general partner of CALC4. Mr. Griffin is the President and Chief Executive Officer of CGP, and owns a controlling interest in CGP and CSGP.
The filing of this statement shall not be construed as an admission that any of the Reporting Persons is the beneficial owner of any securities covered by the statement other than the securities actually owned by such person (if any).
(b)
Address or principal business office or, if none, residence:
The address of each of the Reporting Persons is 830 Brickell Plaza, Miami, Florida 33131.
(c)
Citizenship:
Each of Citadel Advisors, CGP, Citadel Securities and CSGP is organized as a limited liability company under the laws of the State of Delaware. Each of CALC4 and CAH is organized as a limited partnership under the laws of the State of Delaware. Mr. Griffin is a U.S. citizen.
(d)
Title of class of securities:
Class A common stock, par value $0.00001 per share (the "Shares")
(e)
CUSIP Number(s):
60879E408
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:
1. Each of Citadel Advisors LLC, Citadel Advisors Holdings LP and Citadel GP LLC may be deemed to beneficially own 634,285 Shares.
2. Citadel Securities LLC may be deemed to beneficially own 1,507 Shares.
3. Each of Citadel Securities Group LP and Citadel Securities GP LLC may be deemed to beneficially own 1,507 Shares.
4. Mr. Griffin may be deemed to beneficially own 635,792 Shares.
(b)
Percent of class:
1. The number of Shares that each of Citadel Advisors LLC, Citadel Advisors Holdings LP and Citadel GP LLC may be deemed to beneficially own constitutes 9.97% of the Shares outstanding.
2. The number of Shares that Citadel Securities LLC may be deemed to beneficially own constitutes 0.02% of the Shares outstanding.
3. The number of Shares that each of Citadel Securities Group LP and Citadel Securities GP LLC may be deemed to beneficially own constitutes 0.02% of the Shares outstanding.
4. The number of Shares that Mr. Griffin may be deemed to beneficially own constitutes 9.99% of the Shares outstanding.
(c)
Number of shares as to which the person has:
(i) Sole power to vote or to direct the vote:
1. Each of Citadel Advisors LLC, Citadel Advisors Holdings LP and Citadel GP LLC: 0
2. Citadel Securities LLC: 0
3. Each of Citadel Securities Group LP and Citadel Securities GP LLC: 0
4. Mr. Griffin: 0
(ii) Shared power to vote or to direct the vote:
1. Each of Citadel Advisors LLC, Citadel Advisors Holdings LP and Citadel GP LLC: 634,285
2. Citadel Securities LLC: 1,507
3. Each of Citadel Securities Group LP and Citadel Securities GP LLC: 1,507
4. Mr. Griffin: 635,792
(iii) Sole power to dispose or to direct the disposition of:
1. Each of Citadel Advisors LLC, Citadel Advisors Holdings LP and Citadel GP LLC: 0
2. Citadel Securities LLC: 0
3. Each of Citadel Securities Group LP and Citadel Securities GP LLC: 0
4. Mr. Griffin: 0
(iv) Shared power to dispose or to direct the disposition of:
1. Each of Citadel Advisors LLC, Citadel Advisors Holdings LP and Citadel GP LLC: 634,285
2. Citadel Securities LLC: 1,507
3. Each of Citadel Securities Group LP and Citadel Securities GP LLC: 1,507
4. Mr. Griffin: 635,792
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 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.
Citadel Advisors LLC
Signature:
/s/ Seth Levy
Name/Title:
Seth Levy, Authorized Signatory
Date:
04/22/2026
Citadel Advisors Holdings LP
Signature:
/s/ Seth Levy
Name/Title:
Seth Levy, Authorized Signatory
Date:
04/22/2026
Citadel GP LLC
Signature:
/s/ Seth Levy
Name/Title:
Seth Levy, Authorized Signatory
Date:
04/22/2026
Citadel Securities LLC
Signature:
/s/ Seth Levy
Name/Title:
Seth Levy, Authorized Signatory
Date:
04/22/2026
Citadel Securities Group LP
Signature:
/s/ Seth Levy
Name/Title:
Seth Levy, Authorized Signatory
Date:
04/22/2026
Citadel Securities GP LLC
Signature:
/s/ Seth Levy
Name/Title:
Seth Levy, Authorized Signatory
Date:
04/22/2026
Kenneth Griffin
Signature:
/s/ Seth Levy
Name/Title:
Seth Levy, attorney-in-fact*
Date:
04/22/2026
Comments accompanying signature: * Seth Levy is signing on behalf of Kenneth Griffin as attorney-in-fact pursuant to a power of attorney previously filed with the Securities and Exchange Commission, and hereby incorporated by reference herein. The power of attorney was filed as an attachment to a filing by Citadel Advisors LLC on Schedule 13G for Allakos Inc. on October 13, 2023.
How many Momentus (MNTS) shares does Citadel Advisors report owning?
Citadel Advisors and related entities report 634,285 shares each for Citadel Advisors LLC, Citadel Advisors Holdings LP and Citadel GP LLC. The filing lists these holdings as 9.97% of outstanding shares based on the stated share count.
What percentage of MNTS does Kenneth Griffin beneficially own according to this filing?
Kenneth Griffin is reported as beneficially owning 635,792 shares, which the filing states represents 9.99% of the outstanding Class A shares using the disclosed share base.
What share count did the filing use to calculate percentages for MNTS?
The filing uses a total of 6,364,291 Shares outstanding as the basis for percentage calculations, citing the issuer's Form 10-K and a subsequent private placement and convertible warrants.
Are there any warrants or conversion features noted in the MNTS filing?
Yes; the filing references 184,285 Shares issuable upon conversion of certain warrants held by affiliates, and states those warrants contain terms limiting exercise to prevent ownership above 9.99% after exercise.
Does the filing state who holds voting or dispositive power for the MNTS shares?
The filing states the reported holdings reflect shared voting and dispositive power for the listed entities, with sole voting/dispositive powers reported as zero for those holdings.
