Siemens-affiliated entities report significant ownership in Fluence Energy, Inc. As of June 30, 2026, Siemens AG is the record holder of 19,738,064 shares of Fluence Class A common stock and SPT Holding Sarl is the record holder of 21,694,717 shares.
Because SPT Holding is wholly owned by Siemens Pension-Trust e.V., and Siemens AG is an affiliate of Siemens Pension-Trust e.V., these entities may be deemed to share beneficial ownership of an aggregate 41,432,781 shares, or 29.3% of Fluence’s Class A common stock, based on 141,534,496 shares outstanding as of May 12, 2026. A Stockholder Agreement among the Siemens entities, AES Grid Stability, LLC and Qatar Holding LLC leads them to be treated as a Section 13(d) “group” deemed to beneficially own 94,666,665 shares, or 51.7% of the class, calculated under Rule 13d-3. The Siemens-related reporting persons expressly disclaim beneficial ownership of any shares deemed owned solely by virtue of this agreement.
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Key Figures
Siemens AG shares:19,738,064 sharesSPT Holding Sarl shares:21,694,717 sharesAggregate Siemens-related shares:41,432,781 shares+4 more
7 metrics
Siemens AG shares19,738,064 sharesRecord holder position in Fluence Class A as of June 30, 2026
SPT Holding Sarl shares21,694,717 sharesRecord holder position in Fluence Class A as of June 30, 2026
Aggregate Siemens-related shares41,432,781 sharesCombined beneficial ownership attributed to Siemens-affiliated entities
Siemens beneficial ownership percentage29.3 %Portion of Fluence Class A based on 141,534,496 shares outstanding
Shares outstanding141,534,496 sharesFluence Class A common stock outstanding as of May 12, 2026
Group beneficial ownership shares94,666,665 sharesDeemed owned by group under Stockholder Agreement as of June 30, 2026
Group beneficial ownership percentage51.7 %Deemed ownership of Fluence Class A under Rule 13d-3
Key Terms
beneficial ownership, Stockholder Agreement, Section 13(d) of the Securities Exchange Act of 1934, Rule 13d-3, +1 more
5 terms
beneficial ownershipfinancial
"Such beneficial ownership represents in the aggregate 29.3% of the total Class A"
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.
Stockholder Agreementfinancial
"The Reporting Persons, AES Grid Stability, LLC and Qatar Holding LLC are parties to a Stockholder Agreement"
Section 13(d) of the Securities Exchange Act of 1934regulatory
"acting as a "group" with the other Stockholders within the meaning of Section 13(d) of the Securities Exchange Act of 1934"
Section 13(d) of the Securities Exchange Act of 1934 is a U.S. rule that requires anyone who buys more than 5% of a public company’s shares to publicly disclose who they are, how many shares they own, and their intentions toward the company. For investors, this is like a neighborhood alert when someone acquires a large stake in a building: it reveals potential changes in control or strategy that could affect the stock’s price, governance, or future direction.
Rule 13d-3regulatory
"would be deemed to beneficially own an aggregate of 94,666,665 shares ... calculated pursuant to Rule 13d-3"
Rule 13d-3 defines who is treated as the beneficial owner of a company’s shares for U.S. securities disclosure rules — essentially anyone who has the power to vote or direct how shares are voted, or the power to buy or sell them, even if they don’t hold the certificates. For investors this matters because crossing certain ownership thresholds triggers public filing and disclosure obligations and signals potential control or influence, much like having the keys to a car implies you can drive it even if it’s registered to someone else.
shared voting powerfinancial
"Shared Voting Power 21,694,717.00 7 | Sole Dispositive Power 0.00 8 | Shared Dispositive Power"
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.
How much of Fluence Energy (FLNC) do Siemens-affiliated entities report owning?
Siemens-affiliated entities report beneficial ownership of 41,432,781 shares of Fluence Class A common stock, representing 29.3% of the class, based on 141,534,496 shares outstanding as of May 12, 2026.
What are the individual Fluence (FLNC) holdings of Siemens AG and SPT Holding Sarl?
As of June 30, 2026, Siemens AG holds 19,738,064 shares of Fluence Class A common stock, and SPT Holding Sarl holds 21,694,717 shares, with SPT Holding being wholly owned by Siemens Pension-Trust e.V.
What percentage of Fluence (FLNC) does the broader stockholder group beneficially own?
A group including Siemens entities, AES Grid Stability, LLC and Qatar Holding LLC is deemed to beneficially own 94,666,665 shares of Fluence Class A common stock, or 51.7% of the class, calculated under Rule 13d-3.
Do Siemens-related reporting persons acknowledge group status in Fluence (FLNC)?
Yes. They state that, by virtue of a Stockholder Agreement with AES Grid Stability, LLC and Qatar Holding LLC, they are acting as a “group” under Section 13(d) of the Exchange Act with respect to Fluence securities.
Do Siemens entities claim full beneficial ownership of all group Fluence (FLNC) shares?
No. The Siemens-related reporting persons expressly disclaim beneficial ownership of any Fluence Class A shares that they may be deemed to own solely due to the Stockholder Agreement with the other stockholders.
SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549
SCHEDULE 13G
UNDER THE SECURITIES EXCHANGE ACT OF 1934
(Amendment No. 4)
Fluence Energy, Inc.
(Name of Issuer)
Class A common stock, $0.00001 par value
(Title of Class of Securities)
34379V103
(CUSIP Number)
06/30/2026
(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
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)
15.3 %
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)
15.3 %
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)
29.3 %
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:
4601 Fairfax Drive, Suite 600, Arlington, Virginia 22203
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 June 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") and SPT Holding is the record holder of 21,694,717 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 represents in the aggregate 29.3% of the total Class A Common Stock of the Issuer outstanding, based on 141,534,496 shares of Class A Common Stock of the Issuer outstanding as of May 12, 2026, as reflected in the Issuer's Prospectus Supplement on Form 424B7, which was filed with the Securities and Exchange Commission on May 13, 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 June 30, 2026, such a "group" would be deemed to beneficially own an aggregate of 94,666,665 shares of Class A Common Stock, or 51.7% 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:
08/10/2026
Signature:
/s/ Denis Stoffel
Name/Title:
Denis Stoffel, Chief Financial Officer
Date:
08/10/2026
Siemens Pension-Trust e.V.
Signature:
/s/ Dr. Peter Rathgeb
Name/Title:
Dr. Peter Rathgeb, Chair of the Board
Date:
08/10/2026
Signature:
/s/ Heiko Fischer
Name/Title:
Heiko Fischer, Vice Chair of the Board
Date:
08/10/2026
Siemens AG
Signature:
/s/ Sabine Kalbitz
Name/Title:
Sabine Kalbitz, Chief Counsel Mergers, Acquisitions and Corporate
