Xos director files notice to sell 20,000 shares

The filing says 20,000 Xos shares are to be sold via UBS for about $60,000, tied to RSU vestings in June 2025 and June 2026.

Rhea-AI Filing Summary

Xos, Inc. (XOS) is the issuer for which director Dietmar Ostermann has filed a notice of proposed sale of securities under Rule 144. The notice covers up to 20,000 shares of common stock, to be sold through UBS Financial Services Inc., with an aggregate market value of $60,000. Shares of Xos common stock outstanding were 13,718,819 as of September 2, 2026; this is a baseline figure, not the amount being offered. The planned sales relate to RSU vestings of 7,216 shares on June 23, 2025 and 12,784 shares on June 22, 2026. In the prior three months, Ostermann reported several sales, including 10,000 shares on August 20, 2026 for $34,913 and a series of smaller transactions between July 10 and July 17, 2026.

Key Figures

Shares to be sold under Rule 144: 20,000 shares Aggregate market value of proposed sale: $60,000 Shares outstanding: 13,718,819 shares +3 more

6 metrics

Shares to be sold under Rule 144 20,000 shares Maximum number of Xos common shares covered by the Form 144 notice

Aggregate market value of proposed sale $60,000 Total market value of the 20,000 Xos shares referenced in the notice

Shares outstanding 13,718,819 shares Xos common stock outstanding as of September 2, 2026

RSU Vesting June 23, 2025 7,216 shares Xos common stock vested to Dietmar Ostermann on June 23, 2025

RSU Vesting June 22, 2026 12,784 shares Xos common stock vested to Dietmar Ostermann on June 22, 2026

Sale on August 20, 2026 10,000 shares for $34,913 Xos common stock sold by Dietmar Ostermann during the past three months

Key Terms

Rule 144, RSU Vesting, attorney-in-fact, aggregate market value

4 terms

Rule 144 regulatory

"See the definition of "person" in paragraph (a) of Rule 144."

Rule 144 is a U.S. securities regulation that sets conditions under which restricted or insider-held shares can be legally resold to the public, such as required holding periods, availability of public information, limits on how much can be sold at once, and certain filing requirements. For investors it matters because it determines when previously locked-up shares can enter the market — like a release valve that can increase supply, affect share price, and signal insider intent.

RSU Vesting financial

"Common Stock | 06/23/2025 | RSU Vesting | Issuer"

RSU vesting is the process by which restricted stock units — a promise by a company to give shares to an employee — become actual, owned shares over time or when certain goals are met. Investors care because vested shares can dilute existing ownership when issued, and the timing of vesting affects when employees can sell shares, which can influence share supply, insider selling patterns, and company incentives.

attorney-in-fact regulatory

"as attorney-in-fact for Dietmar Ostermann"

An attorney-in-fact is the person or entity given legal authority through a power of attorney to act on behalf of another for specific tasks, such as signing documents, voting shares, or handling transactions. For investors, this matters because it lets a trusted representative make timely decisions or complete paperwork when the owner cannot, much like handing keys to someone to run errands on your behalf—so checks on scope and limits of that authority are important.

aggregate market value financial

"Common Stock | UBS Financial Services Inc ... | 20000 | 60000"

Aggregate market value is the combined price you would pay to buy all outstanding shares of a company or all companies in a group at current market prices — essentially the sum of each stock’s market capitalization. It matters to investors because it shows the overall size and weight of an investment or sector (like the total cost to buy every piece of a puzzle), helps compare scale across companies or markets, and influences index composition and risk exposure.

FAQ

What does this Form 144 filing mean for XOS shareholders?

The Form 144 filing indicates that director Dietmar Ostermann has given notice of his intent to sell up to 20,000 shares of Xos, Inc. (XOS) common stock under Rule 144. It is a required disclosure before certain insider sales, not a company-level financing transaction.

How many XOS shares is Dietmar Ostermann planning to sell under this Form 144?

Dietmar Ostermann has filed to potentially sell up to 20,000 shares of Xos common stock through UBS Financial Services Inc.. The filing lists an aggregate market value of $60,000 for these shares.

How many XOS shares are outstanding according to this filing?

The filing states that 13,718,819 shares of Xos, Inc. common stock were outstanding as of September 2, 2026. This figure provides context for the company’s equity base and is separate from the 20,000 shares covered by the Form 144 notice.

What recent XOS share sales has Dietmar Ostermann reported in the past three months?

In the past three months, Dietmar Ostermann reported several XOS sales, including 10,000 shares on August 20, 2026 for $34,913 and multiple trades of about 4,158–4,159 shares on July 10, 13, 14, 15, 16, and 17, 2026, with proceeds ranging from $8,935 to $10,368.

What RSU vesting events are related to the XOS shares covered by this Form 144?

The Form 144 links the planned XOS sales to RSU Vesting events. Dietmar Ostermann had 7,216 shares vest on June 23, 2025 and 12,784 shares vest on June 22, 2026, both from the issuer, Xos, Inc.

Which broker is handling the potential sale of XOS shares under this Form 144?

The proposed sale of up to 20,000 XOS shares is listed as being handled by UBS Financial Services Inc., located at 1000 Harbor Blvd, Weehawken, New Jersey, with the shares to be sold on NASDAQ.

AI-generated analysis. How Rhea-AI works. Not financial advice.

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Available on EDGAR 09/02/2026 - 12:48 PM Accepted by SEC EDGAR 09/02/2026 - 12:47 PM Learn about SEC filing dates

Form 144 Filer Information	UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Form 144 NOTICE OF PROPOSED SALE OF SECURITIES PURSUANT TO RULE 144 UNDER THE SECURITIES ACT OF 1933
FORM 144

144: Filer Information

Filer CIK	0001179705
Filer CCC	XXXXXXXX
Is this a LIVE or TEST Filing?	LIVE TEST
Submission Contact Information
Name
Phone
E-Mail Address

144: Issuer Information

Name of Issuer	Xos, Inc.
SEC File Number	001-39598
Address of Issuer	3550 TYBURN STREET LOS ANGELES CALIFORNIA 90065
Phone	8183161890
Name of Person for Whose Account the Securities are To Be Sold	Dietmar Ostermann
See the definition of "person" in paragraph (a) of Rule 144. Information is to be given not only as to the person for whose account the securities are to be sold but also as to all other persons included in that definition. In addition, information shall be given as to sales by all persons whose sales are required by paragraph (e) of Rule 144 to be aggregated with sales for the account of the person filing this notice.
Relationship to Issuer	Director

144: Securities Information

Title of the Class of Securities To Be Sold	Name and Address of the Broker	Number of Shares or Other Units To Be Sold	Aggregate Market Value	Number of Shares or Other Units Outstanding	Approximate Date of Sale	Name the Securities Exchange
Common Stock	UBS Financial Services Inc 1000 Harbor Blvd 3rd Floor Weehawken NJ 07086	20000	60000	13718819	09/02/2026	NASDAQ

Furnish the following information with respect to the acquisition of the securities to be sold and with respect to the payment of all or any part of the purchase price or other consideration therefor:

144: Securities To Be Sold

Title of the Class	Date you Acquired	Nature of Acquisition Transaction	Name of Person from Whom Acquired	Is this a Gift?	Date Donor Acquired	Amount of Securities Acquired	Date of Payment	Nature of Payment *
Common Stock	06/23/2025	RSU Vesting	Issuer			7216	06/23/2025	NA
Common Stock	06/22/2026	RSU Vesting	Issuer			12784	06/22/2026	NA

* If the securities were purchased and full payment therefor was not made in cash at the time of purchase, explain in the table or in a note thereto the nature of the consideration given. If the consideration consisted of any note or other obligation, or if payment was made in installments describe the arrangement and state when the note or other obligation was discharged in full or the last installment paid.

Furnish the following information as to all securities of the issuer sold during the past 3 months by the person for whose account the securities are to be sold.

144: Securities Sold During The Past 3 Months

Name and Address of Seller	Title of Securities Sold	Date of Sale	Amount of Securities Sold	Gross Proceeds
Dietmar Ostermann 3550 TYBURN STREET Los Angeles CA 90065	Common Stock	08/20/2026	10000	34913
Dietmar Ostermann 3550 TYBURN STREET Los Angeles CA 90065	Common Stock	07/17/2026	4159	8935
Dietmar Ostermann 3550 TYBURN STREET Los Angeles CA 90065	Common Stock	07/16/2026	4158	8984
Dietmar Ostermann 3550 TYBURN STREET Los Angeles CA 90065	Common Stock	07/15/2026	4159	9576
Dietmar Ostermann 3550 TYBURN STREET Los Angeles CA 90065	Common Stock	07/14/2026	4158	9943
Dietmar Ostermann 3550 TYBURN STREET Los Angeles CA 90065	Common Stock	07/13/2026	4159	9755
Dietmar Ostermann 3550 TYBURN STREET Los Angeles CA 90065	Common Stock	07/10/2026	4158	10368

144: Remarks and Signature

Remarks
Date of Notice	09/02/2026
ATTENTION:
The person for whose account the securities to which this notice relates are to be sold hereby represents by signing this notice that he does not know any material adverse information in regard to the current and prospective operations of the Issuer of the securities to be sold which has not been publicly disclosed. If such person has adopted a written trading plan or given trading instructions to satisfy Rule 10b5-1 under the Exchange Act, by signing the form and indicating the date that the plan was adopted or the instruction given, that person makes such representation as of the plan adoption or instruction date.
Signature	/s/JOSEPH CASSIDY, for UBS Financial Services Inc, as attorney-in-fact for Dietmar Ostermann
ATTENTION: Intentional misstatements or omission of facts constitute Federal Criminal Violations (See 18 U.S.C. 1001)