UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

WASHINGTON, D.C. 20549

FORM 8-K/A

(Amendment No. 1)

CURRENT REPORT

Pursuant to Section 13 or 15(d)

of the Securities Exchange Act of 1934

Date of Report (Date of earliest event reported): November 12, 2020

Taysha Gene Therapies, Inc.

(Exact name of registrant as specified in its Charter)

(214) 612-0000

(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 (see General Instructions A.2. below):

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

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.  ☐

Explanatory Note

This Amendment No. 1 on Form 8-K/A is an amendment to the Current Report on Form 8-K of Taysha Gene Therapies, Inc. filed on November 12, 2020 (the “Original Form 8-K”). Following the initial filing of the Original Form 8-K, the Registrant discovered that Item 2.02 was inadvertently tagged in the submission as Item 2.01. The Registrant is amending the Original Form 8-K to include the correct item tag. No disclosure has changed from the Original Form 8-K.

Item 2.02 Results of Operations and Financial Condition.

On November 12, 2020, Taysha Gene Therapies, Inc. (the “Company”) reported financial results for the third quarter ended September 30, 2020. A copy of this press release is furnished as Exhibit 99.1 to this Current Report on Form 8-K and is incorporated by reference.

The information in this Item 2.02 of this Current Report on Form 8-K (including Exhibit 99.1) is being furnished and shall not be deemed “filed” for purposes of Section 18 of the Securities Exchange Act of 1934, as amended (the “Exchange Act”), or otherwise subject to the liabilities of that Section, nor shall it be deemed incorporated by reference in any filing under the Securities Act of 1933, as amended, or the Exchange Act, except as expressly set forth by specific reference in such a filing.

Item 9.01 Financial Statements and Exhibits.

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.

Exhibit 99.1

Taysha Gene Therapies Reports Third Quarter 2020 Financial Results and

Provides Business Update

Successfully raised $96 million in Series B financing and completed $181 million IPO

Established management team with successful track record of developing and commercializing AAV9-based gene therapies

Company on track to initiate a Phase 1/2 clinical trial of TSHA-101 in GM2 gangliosidosis by the end of 2020 and plans to submit four INDs in 2021

Dallas – November 12, 2020 – Taysha Gene Therapies, Inc. (Nasdaq: TSHA), a patient-centric gene therapy company focused on developing and commercializing AAV-based gene therapies for the treatment of monogenic diseases of the central nervous system in both rare and large patient populations, today reported its financial results for the third quarter of 2020 and provided a business update.

“Just over a year ago, we founded Taysha in partnership with UT Southwestern with a mission to develop gene therapies to address monogenic diseases of the central nervous system, and to that end we have made significant progress in building a talented team that can advance our broad portfolio,” said RA Session, II, President, Founder and CEO of Taysha. “During the third quarter, we raised over $275 million between our Series B financing and our IPO, providing the capital resources to support our industry-leading pipeline of 18 gene therapy programs. We have also bolstered our GMP manufacturing capabilities to ensure we have the capacity to support our development plans for multiple programs by utilizing the UTSW vector core, our internal Taysha manufacturing facility that is currently in development, and our newly announced partnership with Catalent.”

Program Highlights

TSHA-101 for GM2 gangliosidosis – Taysha secured rare pediatric disease designation and orphan drug designation from the U.S. Food and Drug Administration (FDA) for TSHA-101, its bicistronic vector designed to treat GM2 gangliosidosis, also known as Tay-Sachs and Sandhoff disease. Taysha anticipates initiating a Phase 1/2 clinical trial of TSHA-101 in Canada by end of 2020.

TSHA-102 for Rett syndrome –Taysha announced that FDA has granted rare pediatric disease and orphan drug designation for TSHA-102, which is under development for the treatment of Rett syndrome, one of the most common genetic causes of severe intellectual disability. TSHA-102 utilizes the miRARE platform, which is designed to regulate the expression of therapeutic transgenes on a cellular basis. Taysha remains on track to file an Investigational New Drug (IND) application for the program in 2021.

TSHA-118 for CLN1 – Taysha announced the in-licensing of an AAV9-based gene therapy program for the treatment of CLN1. TSHA-118 was originally developed in the academic lab of Steven Gray, Ph.D., Taysha’s Chief Scientific Advisor. CLN1 Batten disease is a rapidly progressive rare lysosomal storage disease with no approved treatments. The company intends to initiate a Phase 1/2 clinical trial of TSHA-118 in 2021 under a currently open IND.

Recent Business Highlights

In October, Taysha announced a partnership with Invitae to support two different screening programs to enable rapid identification of patients with genetic disorders. DETECT Lysosomal Storage Diseases provides genetic testing for lysosomal storage disorders, including GM2 gangliosidosis and CLN1. The Behind the Seizures^® program supports the diagnosis of patients with genetic epilepsies.

In November, Taysha announced a development and manufacturing partnership with Catalent to support future preclinical and clinical supply for several of Taysha’s gene therapy programs, including CLN1 and Rett syndrome.

Taysha has also invested in building its internal management team to advance the development of its broad gene therapy pipeline. The company anticipates more than tripling its headcount from its IPO by the end of 2020 across all areas of the organization.

Financial Results

As of September 30, 2020, cash and cash equivalents totaled $279 million, which includes gross proceeds of $181 million from Taysha’s IPO and $96 million from its Series B financing. Taysha was incorporated in September of 2019 and thus has no previous nine-month results for comparison.

Taysha reported R&D expenses for the nine months ended September 30, 2020 of $19.6 million. The $19.6 million was primarily attributable to $10.0 million of expenses recognized pursuant to the Queen’s University Agreement and the Abeona CLN1 Agreement, $4.1 million related to the manufacture of clinical trial material and $3.9 million in other sponsored research agreements for the Company’s various product candidates. Additionally, Taysha incurred regulatory and clinical consulting expenses of $0.8 million and employee compensation and benefits expenses of $0.8 million, which included $0.4 million of non-cash stock-based compensation.

Taysha reported G&A expenses of $5.0 million for the nine months ended September 30, 2020. The $5.0 million was primarily attributable to $2.7 million of compensation and benefits related to new hires, which included $0.9 million of non-cash stock-based compensation, $1.7 million in consulting fees, $0.5 million of legal expenses related to general corporate matters and $0.1 million related to insurance and other administrative expenses.

About Taysha Gene Therapies

Taysha Gene Therapies (Nasdaq: TSHA) is on a mission to eradicate monogenic CNS disease. With a singular focus on developing curative medicines, we aim to rapidly translate our treatments from bench to bedside. We have combined our team’s proven experience in gene therapy drug development and commercialization with the world-class UT Southwestern Gene Therapy Program to build an extensive, AAV gene therapy pipeline focused on both rare and large-market indications. Together, we leverage our fully integrated platform—an engine for potential new cures—with a goal of dramatically improving patients’ lives. More information is available at www.tayshagtx.com.

Forward-Looking Statements

This press release contains forward-looking statements within the meaning of the Private Securities Litigation Reform Act of 1995. Words such as “anticipates,” “believes,” “expects,” “intends,” “projects,” and “future” or similar expressions are intended to identify forward-looking statements. Forward-looking statements include statements concerning or implying the conduct or timing of our clinical trials and our research, development and regulatory plans for our product candidates, the potential of our product candidates to positively impact quality of life and alter the course of disease in the patients we seek to treat, our research, development and regulatory plans for our product candidates, the potential for these product candidates to receive regulatory approval from the FDA or equivalent foreign regulatory agencies, and whether, if approved, these product candidates will be successfully distributed and marketed and the success of our partnerships with Invitae and Catalent. Forward-looking statements are based on management’s current expectations and are subject to various risks and uncertainties that could cause actual results to differ materially and adversely from those expressed or implied by such forward-looking statements. Accordingly, these forward-looking statements do not constitute guarantees of future performance, and you are cautioned not to place undue reliance on these forward-looking statements. Risks regarding our business are described in detail in our Securities and Exchange Commission (“SEC”) filings, including in our Quarterly Report on Form 10-Q for the quarter ended September 30, 2020, which we intend to file shortly hereafter and will be available on the SEC’s website at www.sec.gov. Additional information will be made available in other filings that we make from time to time with the SEC. Such risks may be amplified by the impacts of the COVID-19 pandemic. These forward-looking statements speak only as of the date hereof, and we disclaim any obligation to update these statements except as may be required by law.

Taysha Gene Therapies

Selected Condensed Consolidated Financial Information

(In thousands, except share and per share data)

(Unaudited)

Statements of Operations

Balance Sheet

Company Contact:

Niren Shah, PharmD, MBA

Taysha Gene Therapies

Nshah@tayshagtx.com

Media Contact:

Carolyn Hawley

Canale Communications

carolyn.hawley@canalecomm.com