Silverback Therapeutics Reports Fourth Quarter and Full Year 2020 Financial Results and Recent Corporate Updates

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Initiated SBT6050 clinical development, with pharmacological activity demonstrated in the first dose cohort

Advanced preclinical development of SBT6290 and declared SBT8230 as the development candidate for chronic hepatitis B virus program

Raised $441.2 million including $277.7 million in gross proceeds from our IPO

$386.6 million in cash and cash equivalents at end of 2020

Silverback Therapeutics, Inc. SBTX ("Silverback"), a clinical-stage biopharmaceutical company leveraging its proprietary ImmunoTAC technology platform to develop systemically delivered, tissue targeted therapeutics for the treatment of cancer, chronic viral infections, and other serious diseases, today reported financial results and provided a corporate update for the fourth quarter and full year ended December 31, 2020.

"2020 was an extraordinary year for Silverback, with the initiation of our first clinical study for SBT6050, in which pharmacological activity was observed in the first dose cohort, the advancement of each of our preclinical programs, expansion of our strong team, and the successful closing of our IPO in December," said Laura Shawver, Ph.D., chief executive officer of Silverback. "We are well-positioned to execute on our mission to develop a new class of tissue-localized therapies that are designed to modulate fundamental biological pathways in cancer and beyond."

2020 Corporate Highlights and 2021 Anticipated Milestones

  • SBT6050 (HER2-TLR8 ImmunoTAC) Phase 1/1b clinical study initiated, with pharmacological activity demonstrated in the first dose cohort. SBT6050 is being studied as a monotherapy and in combination with pembrolizumab, in patients with advanced or metastatic HER2-expressing solid tumors. Changes in pharmacodynamic markers consistent with the potential mechanism of action have been observed in patients treated in the first monotherapy dose cohort. Enrollment is ongoing in Part 1 of the study (SBT6050 monotherapy dose escalation) and treatment has been initiated in Part 3 of the study (SBT6050 plus pembrolizumab dose-escalation). Silverback is on track to deliver interim clinical data from Part 1 of the study in the second half of 2021.
  • SBT6290 (Nectin4-TLR8 ImmunoTAC) continues to advance through preclinical development. SBT6290 includes the same TLR8 agonist linker-payload used in SBT6050, conjugated to a proprietary Nectin4-directed monoclonal antibody. Pre-Investigational New Drug (IND) alignment with the FDA was achieved in February 2021 and an IND application is expected in the fourth quarter of 2021. The initiation of a Phase 1/1b clinical study is anticipated in the first quarter of 2022.
  • SBT8230 (ASGR1-TLR8 ImmunoTAC) development candidate selected in the fourth quarter of 2020. SBT8230 includes the same TLR8 agonist linker-payload used in SBT6050, conjugated to a proprietary ASGR1-directed monoclonal antibody, and is designed to activate human myeloid cells in the liver for treatment of chronic hepatitis B viral infection. CMC scale up and preclinical work continues with IND-enabling toxicology studies expected to commence in the first quarter of 2022.
  • Completed initial public offering resulting in $277.7 million in gross proceeds. Silverback completed an IPO in December 2020, selling 13,225,000 shares at a public offering price of $21.00 per share, raising gross proceeds of $277.7 million (before deducting underwriting discounts and commissions and offering costs). In September 2020, the Company completed a Series C financing, raising $85.0 million in gross proceeds, and in March, July and September 2020, completed a Series B financing, raising $78.5 million in gross proceeds (including $10.1 million upon the conversion of then outstanding convertible notes and accrued interest thereon).

Financial Results

For the fourth quarter ended December 31, 2020, Silverback reported a net loss of $13.1 million, compared to a net loss of $7.0 million for the comparable period in 2019. For the year ended December 31, 2020, the Company reported a net loss of $32.9 million, compared to a net loss of $24.0 million for 2019. Net loss for the fourth quarter and full year of 2020 included non-cash stock-based compensation expense of $2.3 million and $2.6 million, respectively, compared to $42,000 and $148,000 for the same periods in 2019, respectively.

Research and development expenses for the fourth quarter ended December 31, 2020 were $8.8 million, compared to $6.3 million for the same period in 2019. For the year ended December 31, 2020, research and development expenses were $24.6 million, compared to $21.5 million for 2019. The increases in the Company's research and development expenses for the 2020 periods, as compared to the same periods in 2019, were primarily attributable to the advancement of pipeline programs, including SBT6290 and SBT8230, into preclinical development. Silverback also incurred additional personnel-related expenses in 2020 as compared to 2019 as operations grew in support of program advances. These increases were partially offset by a decrease in expenses related to the development of SBT6050 as the program completed manufacturing activities and initiated a Phase 1/1b clinical trial in the second half of 2020.

General and administrative expenses for the fourth quarter ended December 31, 2020 were $4.3 million, compared to $0.7 million for the same period in 2019. For the year ended December 31, 2020, general and administrative expenses were $8.3 million, compared to $2.6 million for the same period in 2019. The increases in general and administrative expenses for the 2020 periods, as compared to the same periods in 2019, were primarily attributable to an increase in personnel-related expenses due to increased headcount in 2020, including new executives, as well as increases in salaries, bonuses, and stock-based compensation. The increase in general and administrative expenses was also due to an increase in legal fees, professional fees, and other various general and administrative expenses as we prepared to become a public company.

As of December 31, 2020, Silverback reported cash and cash equivalents of $386.6 million, compared to $10.0 million at December 31, 2019, which is expected to fund operating expenses and capital expenditure requirements for at least the next 24 months. The Company's cash and cash equivalents balance at December 31, 2020 included $255.3 million of proceeds, net of offering costs, from the Company's initial public offering in December 2020, and $153.3 million of proceeds, net of offering costs, from the Company's Series B and Series C financings in 2020. As of December 31, 2020, the Company had 34,801,537 common shares outstanding.

About Silverback Therapeutics

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Silverback Therapeutics, Inc. is a clinical-stage biopharmaceutical company focused on leveraging its proprietary ImmunoTAC technology platform to develop systemically delivered and tissue targeted therapeutics for the treatment of cancer, chronic viral infections, and other serious diseases. Silverback's platform enables the strategic pairing of proprietary payloads that modulate key disease modifying pathways with monoclonal antibodies directed at specific disease sites. Initially, Silverback is creating a new class of targeted immuno-oncology agents that direct a TLR8 agonist myeloid cell activator to the tumor microenvironment in solid tumors to promote cancer cell killing. Silverback Therapeutics is located in Seattle, Washington. To learn more, visit www.silverbacktx.com.

Forward-Looking Statements

This news release contains certain forward-looking statements that involve risks and uncertainties that could cause actual results to be materially different from historical results or from any future results expressed or implied by such forward-looking statements. Such forward-looking statements include statements regarding, among other things, Silverback's plans and ability to bring new treatments to patients in need, the progress and expected timing of Silverback's drug development programs and clinical trials, the strength of Silverback's balance sheet and the adequacy of cash on hand. Factors that may cause actual results to differ materially include the risk that compounds that appeared promising in early research or clinical trials do not demonstrate safety and/or efficacy in later preclinical studies or clinical trials, the risk that Silverback may not obtain approval to market its product candidates, uncertainties associated with performing clinical trials, regulatory filings and applications, risks associated with reliance on third parties to successfully conduct clinical trials, the risks associated with reliance on outside financing to meet capital requirements, and other risks associated with the process of discovering, developing and commercializing drugs that are safe and effective for use as human therapeutics, and in the endeavor of building a business around such drugs. You are urged to consider statements that include the words "may," "will," "would," "could," "should," "believes," "estimates," "projects," "promise," "potential," "expects," "plans," "anticipates," "intends," "continues," "designed," "goal," or the negative of those words or other comparable words to be uncertain and forward-looking. For a further list and description of the risks and uncertainties that Silverback faces, please refer to Silverback's periodic and other filings with the Securities and Exchange Commission, which are available at www.sec.gov. Such forward-looking statements are current only as of the date they are made, and Silverback assumes no obligation to update any forward-looking statements, whether as a result of new information, future events or otherwise. 

Silverback Therapeutics, Inc.

Balance Sheets

(in thousands, except share and per share data)

(unaudited)

 

 

 

December 31,

 

December 31,

 

 

2020

 

2019

Assets

 

 

 

 

Current assets:

 

 

 

 

Cash and cash equivalents

 

$

386,569

 

 

$

9,976

 

Prepaid expenses and other current assets

 

4,087

 

 

552

 

Total current assets

 

390,656

 

 

10,528

 

Property and equipment, net

 

1,618

 

 

1,316

 

Restricted cash

 

350

 

 

550

 

Right-of-use asset

 

2,180

 

 

3,253

 

Total assets

 

$

394,804

 

 

$

15,647

 

Liabilities, redeemable convertible preferred stock, and stockholders' equity (deficit)

 

 

 

 

Current liabilities:

 

 

 

 

Accounts payable

 

$

2,583

 

 

$

3,518

 

Accrued expenses

 

5,278

 

 

2,112

 

Term loan payable, net

 

844

 

 

1,522

 

Convertible notes, net

 

 

 

9,991

 

Current portion of lease liability

 

896

 

 

783

 

Total current liabilities

 

9,601

 

 

17,926

 

Lease liability, net of current portion

 

2,326

 

 

3,324

 

Total liabilities

 

11,927

 

 

21,250

 

Commitments and contingencies

 

 

 

 

Redeemable convertible preferred stock, $0.0001 par value per share; no shares and 17,142,854 shares authorized, no shares and 15,714,283 shares issued and outstanding with aggregate liquidation preference of $0 and $55,000 at December 31, 2020 and 2019, respectively

 

 

 

53,174

 

Stockholders' equity (deficit):

 

 

 

 

Preferred Stock, $0.0001 par value per share; 10,000,000 and no shares authorized at December 31, 2020 and 2019, respectively; no shares issued and outstanding at December 31, 2020 and 2019

 

 

 

 

Common stock, $0.0001 par value per share; 200,000,000 and 23,500,000 shares authorized, 34,801,537 and 670,477 shares issued, and 34,701,274 and 664,431 shares outstanding at December 31, 2020 and 2019, respectively

 

3

 

 

 

Additional paid-in capital

 

479,608

 

 

5,010

 

Accumulated deficit

 

(96,734

)

(63,787

)

Total stockholders' equity (deficit)

 

382,877

 

(58,777

)

Total liabilities, redeemable convertible preferred stock, and stockholders' equity (deficit)

 

$

394,804

 

 

$

15,647

 

 Silverback Therapeutics, Inc.

Statements of Operations and Comprehensive Loss

(in thousands, except share and per share data)

(unaudited)

 

 

 

Three Months Ended

 

Year Ended

 

 

December 31,

 

December 31,

 

 

2020

 

2019

 

2020

 

2019

Operating expenses:

 

 

 

 

 

 

 

 

Research and development

 

$

8,837

 

 

$

6,273

 

 

$

24,577

 

 

$

21,505

 

General and administrative

 

 

4,264

 

 

 

658

 

 

 

8,341

 

 

 

2,562

 

Total operating expenses

 

 

13,101

 

 

 

6,931

 

 

 

32,918

 

 

 

24,067

 

Loss from operations

 

 

(13,101

)

 

 

(6,931

)

 

 

(32,918

)

 

 

(24,067

)

Interest income (expense), net

 

 

16

 

 

 

(39

)

 

 

(29

)

 

 

100

 

Net loss and comprehensive loss

 

$

(13,085

)

 

$

(6,970

)

 

$

(32,947

)

 

$

(23,967

)

Net loss per share applicable to common stockholders, basic and diluted

 

$

(1.37

)

 

$

(10.51

)

 

$

(11.33

)

 

$

(36.27

)

Weighted-average shares used in computing net loss per share attributable to common stockholders, basic and diluted

 

 

9,563,986

 

 

 

663,406

 

 

 

2,907,542

 

 

 

660,893

 

 

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