Sidus Space Inc. received a joint Schedule 13G disclosing beneficial holdings by Citadel entities and Kenneth Griffin. Citadel Advisors LLC, Citadel Advisors Holdings LP and Citadel GP LLC each report 3,071,391 shares (3.8%); Citadel Securities-related entities report 139,037 shares (0.2%); and Kenneth Griffin reports 3,210,428 shares (4.0%).
The percentage calculations are based on 80,756,044 Shares outstanding, reflecting (i) 67,302,344 shares outstanding as of April 17, 2026, (ii) 11,228,700 shares issued in a public offering on April 21, 2026, and (iii) 2,225,000 shares issued on exercise of warrants; holdings are reported as of the opening of market on April 28, 2026.
Positive
None.
Negative
None.
Insights
Citadel-affiliated entities report modest passive stakes in Sidus Space.
The filing lists shared voting and dispositive power for Citadel Advisors, CAH and CGP over 3,071,391 shares, representing 3.8% of the class based on the issuer's outstanding count described in the filing. The structure indicates ownership through managed funds (CCIL, CMAM) rather than direct personal holdings.
Concentrations to watch: Mr. Griffin's combined attributable position of 3,210,428 shares (4.0%) and the recent April 21, 2026 public offering that changed the outstanding base. Subsequent filings would show any shifts in disposition or voting power.
Schedule 13G indicates passive reporting; power-of-attorney used for signature.
The statement is a joint filing by multiple Citadel entities and Mr. Griffin, and uses a previously filed power of attorney for signature authority. The form lists shared powers (voting/dispositive) rather than sole control, consistent with institutional/managed holding disclosures.
For confirmation, review subsequent Section 13 filings for any amendment converting passive holdings to active (Schedule 13D) or changes after the public offering dated April 21, 2026.
Citadel entity holdings3,071,391 sharesreported as <percent>3.8%</percent> of class
Kenneth Griffin holdings3,210,428 sharesreported as <percent>4.0%</percent> of class
Citadel Securities holdings139,037 sharesreported as <percent>0.2%</percent> of class
Shares outstanding used80,756,044 sharesbasis for percentage calculations
Public offering issuance11,228,700 sharesissued in public offering on <date>April 21, 2026</date>
Warrants exercised2,225,000 sharesreceived upon exercise of certain warrants
Key Terms
Schedule 13G, beneficially own, shared dispositive power, power of attorney
4 terms
Schedule 13Gregulatory
"This is being jointly filed by Citadel Advisors LLC... (Schedule 13G)"
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 3,071,391 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 3,071,391.00"
power of attorneylegal
"Seth Levy is signing on behalf of Kenneth Griffin as attorney-in-fact pursuant to a power of attorney"
A power of attorney is a legal document that allows one person to make decisions and act on behalf of another person, often in financial or legal matters. It’s like giving someone a trusted helper or agent the authority to handle important tasks if you are unable to do so yourself. This matters to investors because it can impact how their assets are managed or transferred if they become unable to oversee their affairs.
SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549
SCHEDULE 13G
UNDER THE SECURITIES EXCHANGE ACT OF 1934
Sidus Space Inc.
(Name of Issuer)
Class A common stock, par value $0.0001 per share (the "Shares")
(Title of Class of Securities)
826165201
(CUSIP Number)
04/21/2026
(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):
826165201
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
3,071,391.00
7
Sole Dispositive Power
0.00
8
Shared Dispositive Power
3,071,391.00
9
Aggregate Amount Beneficially Owned by Each Reporting Person
3,071,391.00
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)
3.8 %
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 80,756,044 Shares outstanding comprised of (i) 67,302,344 Shares outstanding as of April 17, 2026, (ii) 11,228,700 Shares issued in a public offering on April 21, 2026 (according to the issuer's prospectus as filed with the Securities and Exchange Commission on April 21, 2026), and (iii) 2,225,000 Shares received by the Reporting Persons upon the exercise of certain warrants. 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 28, 2026.
SCHEDULE 13G
CUSIP Number(s):
826165201
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
3,071,391.00
7
Sole Dispositive Power
0.00
8
Shared Dispositive Power
3,071,391.00
9
Aggregate Amount Beneficially Owned by Each Reporting Person
3,071,391.00
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)
3.8 %
12
Type of Reporting Person (See Instructions)
HC, PN
SCHEDULE 13G
CUSIP Number(s):
826165201
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
3,071,391.00
7
Sole Dispositive Power
0.00
8
Shared Dispositive Power
3,071,391.00
9
Aggregate Amount Beneficially Owned by Each Reporting Person
3,071,391.00
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)
3.8 %
12
Type of Reporting Person (See Instructions)
HC, OO
SCHEDULE 13G
CUSIP Number(s):
826165201
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
139,037.00
7
Sole Dispositive Power
0.00
8
Shared Dispositive Power
139,037.00
9
Aggregate Amount Beneficially Owned by Each Reporting Person
139,037.00
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)
0.2 %
12
Type of Reporting Person (See Instructions)
BD, OO
SCHEDULE 13G
CUSIP Number(s):
826165201
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
139,037.00
7
Sole Dispositive Power
0.00
8
Shared Dispositive Power
139,037.00
9
Aggregate Amount Beneficially Owned by Each Reporting Person
139,037.00
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)
0.2 %
12
Type of Reporting Person (See Instructions)
HC, PN
SCHEDULE 13G
CUSIP Number(s):
826165201
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
139,037.00
7
Sole Dispositive Power
0.00
8
Shared Dispositive Power
139,037.00
9
Aggregate Amount Beneficially Owned by Each Reporting Person
139,037.00
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)
0.2 %
12
Type of Reporting Person (See Instructions)
HC, OO
SCHEDULE 13G
CUSIP Number(s):
826165201
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
3,210,428.00
7
Sole Dispositive Power
0.00
8
Shared Dispositive Power
3,210,428.00
9
Aggregate Amount Beneficially Owned by Each Reporting Person
3,210,428.00
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)
4.0 %
12
Type of Reporting Person (See Instructions)
HC, IN
SCHEDULE 13G
Item 1.
(a)
Name of issuer:
Sidus Space Inc.
(b)
Address of issuer's principal executive offices:
150 N. Sykes Creek Parkway, Suite 200, Merritt Island, FL 32953
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"), Citadel Multi-Asset Master Fund Ltd., a Cayman Islands company ("CMAM"), and Citadel Securities. Such owned Shares may include other instruments exercisable for or convertible into Shares.
Citadel Advisors is the portfolio manager for CCIL and CMAM. 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 $0.0001 per share (the "Shares")
(e)
CUSIP Number(s):
826165201
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 3,071,391 Shares.
2. Citadel Securities LLC may be deemed to beneficially own 139,037 Shares.
3. Each of Citadel Securities Group LP and Citadel Securities GP LLC may be deemed to beneficially own 139,037 Shares.
4. Mr. Griffin may be deemed to beneficially own 3,210,428 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 3.8% of the Shares outstanding.
2. The number of Shares that Citadel Securities LLC may be deemed to beneficially own constitutes 0.2% 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 0.2% of the Shares outstanding.
4. The number of Shares that Mr. Griffin may be deemed to beneficially own constitutes 4.0% 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: 3,071,391
2. Citadel Securities LLC: 139,037
3. Each of Citadel Securities Group LP and Citadel Securities GP LLC: 139,037
4. Mr. Griffin: 3,210,428
(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: 3,071,391
2. Citadel Securities LLC: 139,037
3. Each of Citadel Securities Group LP and Citadel Securities GP LLC: 139,037
4. Mr. Griffin: 3,210,428
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 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:
04/28/2026
Citadel Advisors Holdings LP
Signature:
/s/ Seth Levy
Name/Title:
Seth Levy, Authorized Signatory
Date:
04/28/2026
Citadel GP LLC
Signature:
/s/ Seth Levy
Name/Title:
Seth Levy, Authorized Signatory
Date:
04/28/2026
Citadel Securities LLC
Signature:
/s/ Seth Levy
Name/Title:
Seth Levy, Authorized Signatory
Date:
04/28/2026
Citadel Securities Group LP
Signature:
/s/ Seth Levy
Name/Title:
Seth Levy, Authorized Signatory
Date:
04/28/2026
Citadel Securities GP LLC
Signature:
/s/ Seth Levy
Name/Title:
Seth Levy, Authorized Signatory
Date:
04/28/2026
Kenneth Griffin
Signature:
/s/ Seth Levy
Name/Title:
Seth Levy, attorney-in-fact*
Date:
04/28/2026
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.
