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Fluence Energy, Inc. had Class A beneficial-ownership positions reported by Siemens AG, Siemens Pension-Trust e.V. and SPT Holding Sarl as of September 30, 2026. Siemens AG reported 41,432,781 shares (28.9%); Siemens Pension-Trust e.V. reported 21,694,717 shares (15.2%); and SPT Holding reported 1,231,982 shares (0.9%). The positions overlap through shared beneficial ownership: Siemens Pension-Trust e.V. wholly owns SPT Holding, and Siemens AG may be deemed to share ownership attributed to Siemens Pension-Trust e.V.
The reporting persons, AES Grid Stability, LLC and Qatar Holding LLC were deemed to beneficially own a group total of 94,666,665 shares, or 51.3%, as of September 30, 2026, under a stockholder agreement concerning transfers and coordinated voting. The reporting persons disclaimed beneficial ownership of shares attributed to them solely because of that agreement.
Key Figures
SPT Holding beneficial ownership:1,231,982 shares (0.9%)Siemens Pension-Trust e.V. beneficial ownership:21,694,717 shares (15.2%)Siemens AG beneficial ownership:41,432,781 shares (28.9%)+2 more
5 metrics
SPT Holding beneficial ownership1,231,982 shares (0.9%)As of September 30, 2026
Siemens Pension-Trust e.V. beneficial ownership21,694,717 shares (15.2%)As of September 30, 2026
Siemens AG beneficial ownership41,432,781 shares (28.9%)As of September 30, 2026
Stockholder group beneficial ownership94,666,665 shares (51.3%)As of September 30, 2026
Class A common stock outstanding143,163,588 sharesAs of July 31, 2026
Key Terms
beneficial ownership, record holder, shared voting power, Stockholder Agreement
4 terms
beneficial ownershipregulatory
"aggregate amount beneficially owned"
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.
record holderregulatory
"SAG is the record holder of 19,738,064 shares"
A record holder is the person or institution officially listed in a company’s books as the owner of shares, bonds or other securities on a specific date. Think of it like the name on the registration of a car: being the record holder determines who is eligible for dividends, voting at meetings, or other shareholder rights. Investors care because actions tied to a set date apply only to those recorded as owners.
shared voting powerregulatory
"Shared Voting Power 21,694,717.00"
Shared voting power occurs when two or more parties jointly have the right to vote or decide how a block of company shares is cast, like co-owners who must agree before moving a piece of furniture. Investors care because who controls voting rights affects board elections, major corporate decisions and takeover outcomes, and shared control can alter regulatory disclosures and the practical influence any holder has over a company’s direction and value.
Stockholder Agreementregulatory
"parties to a Stockholder Agreement"
FAQ
AI-generated questions and answers. How Rhea-AI works. Not financial advice.
How many FLNC shares does Siemens AG beneficially own?
Siemens AG reported beneficial ownership of 41,432,781 shares of Fluence Energy, Inc. Class A common stock, or 28.9%, as of September 30, 2026. The reported amount includes shared beneficial ownership attributed through Siemens Pension-Trust e.V.
How many FLNC shares does the stockholder group own?
The group was deemed to beneficially own 94,666,665 shares, or 51.3% of Fluence Energy, Inc. Class A common stock, as of September 30, 2026. It comprised the reporting persons, AES Grid Stability, LLC and Qatar Holding LLC. The stockholder agreement addresses transfers and coordination of voting, and the reporting persons disclaimed ownership attributed solely to that agreement.
SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549
SCHEDULE 13G
UNDER THE SECURITIES EXCHANGE ACT OF 1934
(Amendment No. 5)
Fluence Energy, Inc.
(Name of Issuer)
Class A common stock, $0.00001 par value
(Title of Class of Securities)
34379V103
(CUSIP Number)
09/30/2026
(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):
34379V103
1
Names of Reporting Persons
SPT Holding Sarl
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
LUXEMBOURG
Number of Shares Beneficially Owned by Each Reporting Person With:
5
Sole Voting Power
0.00
6
Shared Voting Power
1,231,982.00
7
Sole Dispositive Power
0.00
8
Shared Dispositive Power
1,231,982.00
9
Aggregate Amount Beneficially Owned by Each Reporting Person
1,231,982.00
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)
0.9 %
12
Type of Reporting Person (See Instructions)
OO
SCHEDULE 13G
CUSIP Number(s):
34379V103
1
Names of Reporting Persons
Siemens Pension-Trust e.V.
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
GERMANY
Number of Shares Beneficially Owned by Each Reporting Person With:
5
Sole Voting Power
0.00
6
Shared Voting Power
21,694,717.00
7
Sole Dispositive Power
0.00
8
Shared Dispositive Power
21,694,717.00
9
Aggregate Amount Beneficially Owned by Each Reporting Person
21,694,717.00
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)
15.2 %
12
Type of Reporting Person (See Instructions)
OO
SCHEDULE 13G
CUSIP Number(s):
34379V103
1
Names of Reporting Persons
Siemens AG
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
GERMANY
Number of Shares Beneficially Owned by Each Reporting Person With:
5
Sole Voting Power
19,738,064.00
6
Shared Voting Power
21,694,717.00
7
Sole Dispositive Power
19,738,064.00
8
Shared Dispositive Power
21,694,717.00
9
Aggregate Amount Beneficially Owned by Each Reporting Person
41,432,781.00
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)
28.9 %
12
Type of Reporting Person (See Instructions)
OO
SCHEDULE 13G
Item 1.
(a)
Name of issuer:
Fluence Energy, Inc.
(b)
Address of issuer's principal executive offices:
2107 Wilson Boulevard, Suite 900, Arlington, Virginia 22201
Item 2.
(a)
Name of person filing:
This Schedule 13G is filed on behalf of SPT Holding Sarl ("SPT Holding"), Siemens Pension-Trust e.V. ("Siemens e.V.") and Siemens AG ("SAG" together with SPT Holding and Siemens e.V. (the "Reporting Persons").
(b)
Address or principal business office or, if none, residence:
The business address of SPT Holding is 21 Rue Edmond Reuter, Contern Luxembourg 5326. The business address of Siemens e.V. is Wittelsbacher Platz 2, 80333 Munich, Germany. The business address of SAG is Werner-von-Siemens-Strasse 1, 80333 Munich, Germany.
(c)
Citizenship:
SPT Holding is organized under the laws of Luxembourg. SAG and Siemens e.V. are organized under the laws of Germany.
(d)
Title of class of securities:
Class A common stock, $0.00001 par value
(e)
CUSIP No.:
34379V103
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:
The information contained in rows 5, 6, 7, 8, 9, 10, and 11 on each of the cover pages of this Schedule 13G is incorporated by reference in its entirety into this Item 4.
As of September 30, 2026, SAG is the record holder of 19,738,064 shares of Class A common stock, $0.00001 par value ("Class A Common Stock") of Fluence Energy, Inc. (the "Issuer"), Siemens e.V. is the record holder of 20,462,735 shares of Class A Common Stock and SPT Holding is the record holder of 1,231,982 shares of Class A Common Stock. SPT Holding is a wholly owned subsidiary of Siemens e.V. and as such, Siemens e.V. may be deemed to share beneficial ownership of the shares of Class A Common Stock beneficially owned by SPT Holding. SAG is an affiliate of Siemens e.V. and as such, may be deemed to share beneficial ownership of the shares of Class A Common Stock beneficially owned by Siemens e.V. Such beneficial ownership by SAG represents in the aggregate 41,432,781 shares of Class A Common Stock which represents 28.9% of the total Class A Common Stock of the Issuer outstanding, based on 143,163,588 shares of Class A Common Stock of the Issuer outstanding as of July 31, 2026, as reflected in the Issuer's Quarterly Report on Form 10-Q, which was filed with the Securities and Exchange Commission on August 5, 2026.
The Reporting Persons, AES Grid Stability, LLC and Qatar Holding LLC (collectively, the "Stockholders") are parties to a Stockholder Agreement (the "Stockholder Agreement"), which contains, among other things, certain provisions relating to transfer of, and coordination of the voting of, securities of the Issuer by the parties thereto.
By virtue of the Stockholder Agreement and the obligations and rights thereunder, the Reporting Persons acknowledge and agree that they are acting as a "group" with the other Stockholders within the meaning of Section 13(d) of the Securities Exchange Act of 1934, as amended (the "Exchange Act"). Based in part on information provided by or on behalf of such other Stockholders, as of September 30, 2026, such a "group" would be deemed to beneficially own an aggregate of 94,666,665 shares of Class A Common Stock, or 51.3% of the Class A Common Stock of the Issuer, calculated pursuant to Rule 13d-3. The Reporting Persons expressly disclaim beneficial ownership over any shares of Class A Common Stock that they may be deemed to beneficially own solely by reason of the Stockholder Agreement. Certain entities affiliated with the other Stockholders separately file Schedule 13G filings reporting their beneficial ownership of shares of Class A Common Stock.
(b)
Percent of class:
See responses to Item 11 on each cover page and Item 4(a) above.
(c)
Number of shares as to which the person has:
(i) Sole power to vote or to direct the vote:
See responses to Item 5 on each cover page and Item 4(a) above.
(ii) Shared power to vote or to direct the vote:
See responses to Item 6 on each cover page and Item 4(a) above.
(iii) Sole power to dispose or to direct the disposition of:
See responses to Item 7 on each cover page and Item 4(a) above.
(iv) Shared power to dispose or to direct the disposition of:
See responses to Item 8 on each cover page and Item 4(a) above.
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.
If a group has filed this schedule pursuant to §240.13d-1(b)(1)(ii)(J), so indicate under Item 3(j) and attach an exhibit stating the identity and Item 3 classification of each member of the group. If a group has filed this schedule pursuant to §240.13d-1(c) or §240.13d-1(d), attach an exhibit stating the identity of each member of the group.
See Item 4(a) above.
Item 9.
Notice of Dissolution of Group.
Not Applicable
Item 10.
Certifications:
Not Applicable
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.
SPT Holding Sarl
Signature:
/s/ Thomas Gruenewald
Name/Title:
Thomas Gruenewald, Chief Executive Officer
Date:
11/10/2026
Signature:
/s/ Denis Stoffel
Name/Title:
Denis Stoffel, Chief Financial Officer
Date:
11/10/2026
Siemens Pension-Trust e.V.
Signature:
/s/ Dr. Peter Rathgeb
Name/Title:
Dr. Peter Rathgeb, Chair of the Board
Date:
11/10/2026
Signature:
/s/ Heiko Fischer
Name/Title:
Heiko Fischer, Vice Chair of the Board
Date:
11/10/2026
Siemens AG
Signature:
/s/ Sabine Kalbitz
Name/Title:
Sabine Kalbitz, Head of Mergers, Acquisitions and Corporate
