Birchtech (NYSE: BCHT) lifts equity raise to $16.4M with over-allotment

Rhea-AI Filing Summary

Birchtech Corp. expanded its recent stock sale through a partial use of the underwriters’ over-allotment option. The company originally sold 6,250,000 common shares at $2.40 per share, generating gross proceeds of $15.0 million.

On March 17, 2026, the underwriters bought an additional 600,000 shares at the same price, adding approximately $1.4 million of gross proceeds. In total, 6,850,000 shares have been issued in the offering, with aggregate gross proceeds of about $16.4 million and 337,500 over-allotment shares still available.

Insights

Equity capital markets analyst

Birchtech modestly increases equity raise to about $16.4M.

Birchtech Corp. completed a common stock offering at $2.40 per share and then saw underwriters partially exercise their over-allotment option for 600,000 additional shares. This brought total shares issued in the deal to 6,850,000.

Gross proceeds rose from $15.0 million to approximately $16.4 million, providing extra cash without changing the offering price. A remaining 337,500-share over-allotment capacity gives limited additional flexibility if underwriters choose to exercise more, though any further exercise would add incremental dilution.

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UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

FORM 8-K

CURRENT REPORT

Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934

Date of Report (Date of earliest event reported) March 17, 2026

BIRCHTECH CORP.

(Exact name of registrant as specified in its charter)

Delaware (State or other jurisdiction of incorporation) 000-33067 (Commission File Number) 87-0398271 (IRS Employer Identification No.)

1810 Jester Drive  Corsicana, Texas	75109
(Address of principal executive offices)	(Zip Code)

(614) 505-6115

(Registrant’s telephone number, including area code)

Not applicable

(Former name or former address, if changed since last report)

Check the appropriate box below if the Form 8-K filing is intended to simultaneously satisfy the filing obligation of the registrant under any of the following provisions:

¨ Written communications pursuant to Rule 425 under the Securities Act (17 CFR 230.425)

¨ Soliciting material pursuant to Rule 14a-12 under the Exchange Act (17 CFR 240.14a-12)

¨ Pre-commencement communications pursuant to Rule 14d-2(b) under the Exchange Act (17 CFR 240.14d-2(b))

¨ Pre-commencement communications pursuant to Rule 13e-4(c) under the Exchange Act (17 CFR 240.13e-4(c))

Securities registered pursuant to Section 12(b) of the Act:

Title of each class		Trading Symbol(s)		Name of each exchange on which registered
Common Stock, par value $0.001 per share		BCHT		NYSE American LLC

Indicate by check mark whether the registrant is an emerging growth company as defined in Rule 405 of the Securities Act of 1933 (§ 230.405 of this chapter) or Rule 12b-2 of the Securities Exchange Act of 1934 (§ 240.12b-2 of this chapter).

Emerging growth company ¨

If an emerging growth company, indicate by check mark if the registrant has elected not to use the extended transition period for complying with any new or revised financial accounting standards provided pursuant to Section 13(a) of the Exchange Act. ¨

Item 8.01 Other Events.

As previously reported, on February 27, 2026, Birchtech Corp. (the “Company”) completed a public offering (the “Offering”) of 6,250,000 shares of the Company’s common stock, par value $0.001 per share, at a purchase price per share of $2.40 (the “Offering Price”), generating gross proceeds of $15.0 million. The Company entered into an underwriting agreement with Lake Street Capital Markets, LLC, as representative of the several underwriters named therein (collectively, the “Underwriters”), relating to the Offering, pursuant to which the Company also granted the Underwriters a 30-day option to purchase up to an additional 937,500 shares of common stock at the Offering Price (the “Over-Allotment Option”).

On March 17, 2026, the Company sold to the Underwriters pursuant to the Underwriters' partial exercise of its Over-Allotment Option, 600,000 shares of common stock resulting in additional gross proceeds to the Company of approximately $1.4 million. After giving effect to such partial exercise of the Over-Allotment Option, a total of 6,850,000 shares of common stock have been issued and sold in the Offering, and the gross proceeds from the Offering, including the partial exercise of the Over-Allotment Option, was approximately $16.4 million. The Over-Allotment Option currently provides for the purchase of up to an additional 337,500 shares of common stock, which remain unexercised.

Item 9.01. Financial Statements and Exhibits.

(d) Exhibits.

Exhibit Number		Description
104		Cover Page Interactive Data File (embedded within the Inline XBRL document)

2

SIGNATURES

Pursuant to the requirements of the Securities Exchange Act of 1934, as amended, the registrant has duly caused this report to be signed on its behalf by the undersigned hereunto duly authorized.

	Birchtech Corp.
Date: March 17, 2026	By:	/s/ Richard MacPherson
		Richard MacPherson President and Chief Executive Officer

3

FAQ

What did Birchtech Corp. (BCHT) announce in this 8-K filing?

Birchtech Corp. reported that underwriters partially exercised their over-allotment option in its recent stock offering, buying 600,000 additional shares. This increased total shares sold to 6,850,000 and raised gross proceeds to roughly $16.4 million, all at $2.40 per share.

How much capital has Birchtech Corp. (BCHT) raised in its recent stock offering?

Birchtech has raised approximately $16.4 million in gross proceeds from its common stock offering. The company initially generated $15.0 million, then added about $1.4 million after underwriters purchased 600,000 extra shares through a partial over-allotment exercise.

What were the key terms of Birchtech Corp.’s (BCHT) stock offering?

Birchtech sold common stock at a purchase price of $2.40 per share. The base deal covered 6,250,000 shares, and underwriters held a 30-day over-allotment option for up to 937,500 additional shares at the same price, of which 600,000 were exercised.

How many shares remain available under Birchtech Corp.’s (BCHT) over-allotment option?

Following the partial exercise, 337,500 shares remain available under Birchtech’s over-allotment option. Originally, underwriters could buy up to 937,500 additional shares; they have purchased 600,000 so far, leaving a smaller pool that may or may not be exercised later.

Who managed Birchtech Corp.’s (BCHT) public stock offering?

Lake Street Capital Markets, LLC acted as representative for the underwriters in Birchtech’s public offering. The company entered into an underwriting agreement with Lake Street and other named underwriters, who received a 30-day over-allotment option to purchase additional common shares at the offering price.

What total number of Birchtech Corp. (BCHT) shares were issued in the offering so far?

To date, Birchtech has issued and sold 6,850,000 shares in this offering. That total includes the original 6,250,000 shares plus 600,000 shares sold when underwriters partially exercised their over-allotment option, all at the same $2.40 offering price per share.

Filing Exhibits & Attachments

3 documents

Other Documents

• EX-101 XBRL TAXONOMY EXTENSION SCHEMA 2.9 KB
• EX-101 XBRL TAXONOMY EXTENSION LABEL LINKBASE 33.4 KB
• EX-101 XBRL TAXONOMY EXTENSION PRESENTATION LINKBASE 21.8 KB