T1 Energy (TE) holder Trina Solar sells 22.5M shares, now at 11%

Rhea-AI Filing Summary

Trina Solar (Schweiz) AG, a major shareholder of T1 Energy Inc., disclosed significant share sales and an updated stake. On May 21 and May 22, 2026, it sold a total of 22,500,000 T1 Energy common shares in ordinary course transactions at prices mostly between $7.74 and $9.43 per share. Following these sales, Trina Solar reports beneficial ownership of 30,652,664 shares, representing 11.0% of T1 Energy’s common stock, with sole voting and dispositive power over all of these shares. The filing also notes that Trina Solar previously had the right to designate a director under a Cooperation Agreement, but that right was removed in an amended agreement and its designated director resigned on March 30, 2026.

Positive

• None.

Negative

• Large shareholder reduces position: Trina Solar (Schweiz) AG sold 22,500,000 T1 Energy shares on May 21–22, 2026, leaving it with 30,652,664 shares, or 11.0% of the company’s common stock.

Insights

Equity ownership analyst

Large shareholder trims T1 Energy position and confirms 11% stake.

Trina Solar (Schweiz) AG sold 22,500,000 T1 Energy shares on May 21–22, 2026. The trades occurred in multiple blocks, mainly between $7.74 and $9.43 per share, and are described as in the ordinary course of business.

After these sales, Trina Solar reports beneficial ownership of 30,652,664 shares, or 11.0% of T1 Energy’s common stock, with sole voting and dispositive power. This confirms it remains a large but reduced shareholder.

The filing also notes an Amended and Restated Cooperation Agreement dated December 29, 2025, which removed Trina Solar’s right to designate a board member, and the related director resigned on March 30, 2026. Subsequent ownership or governance changes, if any, would appear in later filings.

Key Figures

Current beneficial ownership: 30,652,664 shares Ownership percentage: 11.0% Shares sold May 21–22, 2026: 22,500,000 shares +5 more

8 metrics

Current beneficial ownership 30,652,664 shares T1 Energy common stock beneficially owned by Trina Solar (Schweiz) AG

Ownership percentage 11.0% Percent of T1 Energy common stock based on 279,271,380 shares outstanding as of May 8, 2026

Shares sold May 21–22, 2026 22,500,000 shares Total T1 Energy shares sold by Trina Solar in ordinary course transactions

May 21 block 1 average price $8.6229 per share 8,849,024 shares sold; prices ranged from $8.07 to $9.06

May 21 block 2 average price $9.2011 per share 1,150,976 shares sold; prices ranged from $9.07 to $9.43

May 21 block 3 average price $8.708 per share 3,000,000 shares sold; prices ranged from $8.61 to $8.96

May 22 main block average price $8.1347 per share 9,479,904 shares sold; prices ranged from $7.74 to $8.72

May 22 small block price $8.80 per share 20,096 shares sold at a fixed price

Key Terms

Schedule 13D, beneficially owned, sole voting power, sole dispositive power, +2 more

6 terms

Schedule 13D regulatory

"If the filing person has previously filed a statement on Schedule 13G to report the acquisition that is the subject of this"

A Schedule 13D is a legal document that investors file with regulators when they buy a large enough stake in a company to potentially influence its management or decisions. It provides details about the investor’s intention, ownership stake, and plans, helping other investors understand who is gaining control and what their motives might be.

beneficially owned financial

"Number of Shares Beneficially Owned by Each Reporting Person With:"

Beneficially owned describes securities or assets where a person has the economic rights and control—such as the right to receive dividends and to direct voting—even if legal title is held in another name. Think of it like having the keys and using a car that’s registered to someone else: you get the benefits and make decisions. Investors care because beneficial ownership reveals who truly controls value and voting power, affecting corporate decisions and takeover dynamics.

sole voting power financial

"Sole Voting Power 30,652,664.00"

Sole voting power is the exclusive right to cast votes attached to a shareholder’s stock without needing approval from anyone else. Like holding the only remote control for a TV, it lets that holder decide corporate matters such as board members, mergers, and policy changes, making it important to investors because it concentrates control and can strongly influence a company’s strategy and the value of its shares.

sole dispositive power financial

"Sole Dispositive Power 30,652,664.00"

Sole dispositive power is the exclusive legal authority to decide what happens to a security — for example, whether to sell, transfer, or retain shares — without needing anyone else’s permission. Investors care because it signals who truly controls the economic outcome of an investment: like holding the only key to a safe, the holder can realize gains or losses and may trigger regulatory reporting, insider rules, or influence over corporate ownership.

Cooperation Agreement regulatory

"Under the Cooperation Agreement dated December 23, 2024, upon meeting certain conditions"

A cooperation agreement is a formal contract between two or more organizations that lays out who will do what, how resources and responsibility are shared, how benefits or costs are divided, and how disputes or exits are handled. Like two chefs agreeing on a shared recipe and kitchen duties, it matters to investors because it can create new revenue paths, shift costs or risks, affect who controls key assets or technologies, and change a company’s future growth prospects.

ordinary course of business financial

"the Reporting Person sold a total of 22,500,000 shares of common stock of the Issuer in the ordinary course of business"

The ordinary course of business means the regular, routine activities a company carries out to operate day-to-day — sales, payroll, supplier orders, customer service and similar predictable tasks. For investors, distinguishing these normal activities from unusual transactions is important because routine actions signal steady operations and predictable cash flow, while departures from the ordinary course (like one‑off deals or emergency costs) can indicate added risk or one-time impacts to earnings, much like household chores versus a sudden home renovation.

SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

SCHEDULE 13D

Under the Securities Exchange Act of 1934

(Amendment No. 5)

T1 Energy Inc.

(Name of Issuer)

Common Stock, par value $0.01

(Title of Class of Securities)

35834F104

(CUSIP Number)

Catherine Pan-Giordano Esq.
51 W. 52nd Street,
New York, NY, 10019
(212) 415-9200

Anthony Epps Esq.
1400 Wewatta Street,
Denver, CO, 80202
(303) 352-1109

(Name, Address and Telephone Number of Person Authorized to Receive Notices and Communications)

05/21/2026

(Date of Event Which Requires Filing of This Statement)

If the filing person has previously filed a statement on Schedule 13G to report the acquisition that is the subject of this Schedule 13D, and is filing this schedule because of §§ 240.13d-1(e), 240.13d-1(f) or 240.13d-1(g), check the following box.

The information required on the remainder of this cover page shall not be deemed to be "filed" for the purpose of Section 18 of the Securities Exchange Act of 1934 ("Act") or otherwise subject to the liabilities of that section of the Act but shall be subject to all other provisions of the Act (however, see the Notes).

schemaVersion:

SCHEDULE 13D

CUSIP Number(s): 35834F104

1

Name of reporting person

Trina Solar (Schweiz) AG

2

Check the appropriate box if a member of a Group (See Instructions)

(a)
(b)

3

SEC use only

4

Source of funds (See Instructions)

OO

5

Check if disclosure of legal proceedings is required pursuant to Items 2(d) or 2(e)

6

Citizenship or place of organization

SWITZERLAND

Number of Shares Beneficially Owned by Each Reporting Person With:

7	Sole Voting Power 30,652,664.00
8	Shared Voting Power 0.00
9	Sole Dispositive Power 30,652,664.00
10	Shared Dispositive Power 0.00

11

Aggregate amount beneficially owned by each reporting person

30,652,664.00

12

Check if the aggregate amount in Row (11) excludes certain shares (See Instructions)

13

Percent of class represented by amount in Row (11)

11.0 %

14

Type of Reporting Person (See Instructions)

CO

Comment for Type of Reporting Person:

Percent of class calculated based on 279,271,380 shares of common stock of the Issuer outstanding as of May 8, 2026, as reported by the Issuer on the 10-Q filed with the Securities and Exchange Commission on May 12, 2026.

SCHEDULE 13D

Item 1.	Security and Issuer
(a)	Title of Class of Securities: Common Stock, par value $0.01
(b)	Name of Issuer: T1 Energy Inc.
(c)	Address of Issuer's Principal Executive Offices: 1211 E. 4th Street, Austin, TEXAS , 78702.
Item 2.	Identity and Background
(a)	Trina Solar (Schweiz) AG ("Reporting Person")
(b)	Birkenweg 4 Wallisellen, Switzerland 8304
(c)	The Reporting Person is engaged in the business of investment. Under the Cooperation Agreement dated December 23, 2024, upon meeting certain conditions, the Reporting Person was entitled to designate at least one "Trina Director" and did so on December 23, 2024. On December 29, 2025, the Issuer and the Reporting Person entered into an Amended and Restated Cooperation Agreement removing that appointment right, and the Trina Director resigned on March 30, 2026. Accordingly, from December 23, 2024, to March 30, 2026, the Reporting Person was deemed to be a deputized director of the Issuer.
(d)	N/A - None
(e)	N/A - None
(f)	Switzerland
Item 3.	Source and Amount of Funds or Other Consideration
	Proceeds of sale allocated to working capital of Reporting Person.
Item 4.	Purpose of Transaction
	On May 21, 2026, and May 22, 2026, the Reporting Person sold a total of 22,500,000 shares of common stock of the Issuer in the ordinary course of business.
Item 5.	Interest in Securities of the Issuer
(a)	11.0%
(b)	Sole voting power: 30,652,664 Shared voting power: 0 Sole dispositive power: 30,652,664 Shared dispositive power: 0
(c)	On May 21, 2026, the Reporting Person sold 13,000,000 common shares of the Issuer (the "Shares"), as set forth below: 8,849,024 Shares at an average weighted price of $8.6229 per share, with sales prices ranging from $8.07 to $9.06, inclusive 1,150,976 Shares at an average weighted price of $9.2011 per share, with sales prices ranging from $9.07 to $9.43, inclusive 3,000,000 Shares at an average weighted price of $8.708 per share, with sales prices ranging from $8.61 to $8.96, inclusive On May 22, 2026, the Reporting Person sold 9,500,000 Shares, as set forth below: 9,479,904 Shares at an average weighted price of $8.1347 per share, with sales prices ranging from $7.74 to $8.72, inclusive 20,096 Shares at $8.80 per share
(d)	N/A
(e)	N/A
Item 6.	Contracts, Arrangements, Understandings or Relationships With Respect to Securities of the Issuer
	Exhibit 10.1 Cooperation Agreement dated as of December 23, 2024 Exhibit 10.2 Amended and Restated Cooperation Agreement dated as of December 29, 2025
Item 7.	Material to be Filed as Exhibits.
	Exhibit 10.1 - Incorporated by reference to Exhibit 10.5 to Schedule 13D filed with the Securities and Exchange Commission on December 27, 2024, and incorporated by reference to Exhibit 10.4 to the Form 8-K filed with the Securities and Exchange Commission on November 6, 2024 Exhibit 10.2 - Incorporated by reference to Exhibit 10.1 to the Form 8-K filed with the Securities and Exchange Commission on December 30, 2025

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.

Trina Solar (Schweiz) AG

Signature:	/a/ Vincenzo Costanzelli
Name/Title:	Chairman of Board of Directors
Date:	05/26/2026

FAQ

How many T1 Energy (TE) shares does Trina Solar now own?

Trina Solar (Schweiz) AG now beneficially owns 30,652,664 T1 Energy common shares, representing 11.0% of the company’s outstanding stock based on 279,271,380 shares outstanding as of May 8, 2026, with sole voting and dispositive power.

How many T1 Energy (TE) shares did Trina Solar recently sell?

Trina Solar (Schweiz) AG sold a total of 22,500,000 T1 Energy common shares on May 21 and May 22, 2026. These transactions were described as occurring in the ordinary course of business, across several trade blocks at various market prices.

At what prices did Trina Solar sell its T1 Energy (TE) shares?

On May 21, 2026, Trina Solar sold blocks at average weighted prices of $8.6229, $9.2011, and $8.708 per share. On May 22, it sold most shares at an average $8.1347 per share and a small block at $8.80, with ranges from $7.74 to $9.43.

What percentage of T1 Energy (TE) does Trina Solar’s stake represent?

Trina Solar’s reported beneficial ownership represents 11.0% of T1 Energy’s common stock. This percentage is calculated using 279,271,380 shares outstanding as of May 8, 2026, as reported by T1 Energy in its Form 10-Q filed on May 12, 2026.

Did Trina Solar have board representation at T1 Energy (TE)?

Trina Solar previously had the right under a Cooperation Agreement to designate at least one “Trina Director” and did so on December 23, 2024. An Amended and Restated Cooperation Agreement later removed this right, and the Trina Director resigned on March 30, 2026.

What is Trina Solar’s relationship to T1 Energy (TE) after the cooperation changes?

After the Amended and Restated Cooperation Agreement dated December 29, 2025, Trina Solar no longer has the contractual right to appoint a director. It remains a significant shareholder, reporting 30,652,664 shares with sole voting and dispositive power but no deputized director status after March 30, 2026.