Vincent Mathis - 18 Dec 2025 Form 4 Insider Report for Fluence Energy, Inc. (FLNC)

Reporting relationship: SVP & Chief Legal and Compliance Officer and Secretary.
Issuer ticker: FLNC
Reported as of: 18 Dec 2025
Net transaction value: -$1,213,942
SEC form: 4
Accepted by SEC: 22 Dec 2025, 16:15:48 UTC
Prior SEC filing: 03 Dec 2025
Next SEC filing: 20 Feb 2026
Source filing: View source filing
Reporting owner signature: /s/ Vincent W. Mathis

Key filing fact

Vincent Mathis filed Form 4 for Fluence Energy, Inc. (FLNC) on 22 Dec 2025.

Key facts

This page summarizes Vincent Mathis's Form 4 filing for Fluence Energy, Inc. (FLNC).
5 reported transactions and 2 derivative rows are listed below.
Accepted by SEC: 22 Dec 2025, 16:15.

Change

Previous filing in this sequence was filed on 03 Dec 2025.
Current net transaction value: -$1,213,942.

Research use

This tells you what this filing adds before you inspect full transaction and derivative tables.
You can trace every row back to the original SEC filing document.

Evidence

Filed on Form 4

Ownership activity is grounded in SEC Form 4 disclosures.

View source filing

Reporting Owners (1)

CIK 0001751108 Primary reporting owner

Mathis Vincent

Relationship: SVP & Chief Legal and Compliance Officer and Secretary.
Address: C/O FLUENCE ENERGY, INC., 4601 FAIRFAX DRIVE, SUITE 600, ARLINGTON
Signature: /s/ Vincent W. Mathis
Signature date: 22 Dec 2025

Reported non-derivative transactions

Shares, units, or other non-derivative securities reported in this filing.

FLNC transaction

Class A Common Stock

Options Exercise

Transaction value
Shares: +14,935
Change %: +60%
Price
Shares after: 39,715
Date: 18 Dec 2025
Ownership: Direct
Footnotes: F1

FLNC transaction

Class A Common Stock

Options Exercise

Transaction value
Shares: +124,456
Change %: +313%
Price
Shares after: 164,171
Date: 18 Dec 2025
Ownership: Direct
Footnotes: F1

FLNC transaction

Class A Common Stock

Tax liability

Transaction value: $1,213,942
Shares: -62,866
Change %: -38%
Price: $19.31
Shares after: 101,305
Date: 18 Dec 2025
Ownership: Direct
Footnotes: F2

Reported derivative securities

Options, warrants, convertible securities, or similar derivative positions disclosed in the filing.

FLNC transaction Derivative

Restricted Stock Unit

Options Exercise

Transaction value: $0
Shares: -14,935
Change %: -33%
Price: $0.000000
Shares after: 29,869
Date: 18 Dec 2025
Ownership: Direct
Underlying class: Class A Common Stock
Underlying amount: 14,935
Exercise price
Footnotes: F1, F3

FLNC transaction Derivative

Restricted Stock Unit

Options Exercise

Transaction value: $0
Shares: -124,456
Change %: -50%
Price: $0.000000
Shares after: 124,456
Date: 18 Dec 2025
Ownership: Direct
Underlying class: Class A Common Stock
Underlying amount: 124,456
Exercise price
Footnotes: F1, F4

^* marks a reported price that did not pass the local price check.

Additional SEC filing notes

Filing notes and footnotes

Explanation of responses 4 footnotes

Footnote F1

Each restricted stock unit ("RSU") represents a contingent right to receive one share of Class A Common Stock of the Issuer.

Footnote F2

Represents the number of shares of Class A Common Stock that have been withheld to satisfy tax withholding obligations in connection with the vesting of the RSUs.

Footnote F3

The RSUs vest in three equal annual installments with the first installment having vested on December 18, 2025, the second installment vesting on December 18, 2026 and the final installment vesting on December 18, 2027, subject to Reporting Person's continued service with the Issuer through the applicable vesting date.

Footnote F4

The RSUs vest in two equal annual installments with the first installment having vested on December 18, 2025 and the second installment vesting on December 18, 2026, subject to Reporting Person's continued service with the Issuer through the applicable vesting date.

SEC remarks

SVP & Chief Legal and Compliance Officer and Secretary.