GlobeNewswire Inc | Sep 8, 2020 04:01PM EDT

September 08, 2020

Completed $263M IPO in July, and private financing in late June

Company plans to initiate four new clinical trials by year-end, including in three expanded indications for ANX005 and first-in-human trial of ANX009

Phase 2 trials of ANX005 in GBS and ANX007 in GA remain on track for 2021

SOUTH SAN FRANCISCO, Calif., Sept. 08, 2020 (GLOBE NEWSWIRE) -- Annexon, Inc. (Annexon) (Nasdaq: ANNX), a clinical-stage biopharmaceutical company developing a pipeline of novel therapies for patients with classical complement-mediated disorders of the body, brain and eye, today announced second quarter 2020 financial results and recent highlights.

This is an exciting time in Annexons history as we advance our pioneering platform to treat a wide array of classical complement-mediated diseases, said Douglas Love, Esq., president and chief executive officer of Annexon. We continue to make notable progress advancing our deep pipeline, and remain intensely focused on the execution of our near-term strategic and development plans. In that regard, we remain on track to initiate several clinical trials in diverse diseases over the balance of 2020 and early 2021.

Recent Highlights

-- In July 2020, Annexon completed an upsized IPO of 14,750,000 shares of its common stock, including the exercise of the underwriters option to purchase an additional 2,139,403 shares of common stock, resulting in net proceeds of $262.7 million, after deducting underwriting commissions and offering expenses. -- In July 2020, Michael Overdorf was appointed chief business officer to oversee corporate development and commercial strategy efforts for the company. Mr. Overdorf brings nearly 20 years of industry experience to Annexon. Prior to joining, he spent 19 years at Eli Lilly and Company in various executive leadership roles, most recently in Corporate Business Development. -- In June 2020, prior to its IPO, Annexon successfully completed a private crossover financing, with net proceeds of $96.8 million.

Anticipated Upcoming Milestones

-- ANX005, a clinical-stage investigational monoclonal antibody intended to treat patients with complement-mediated disorders, is currently being evaluated to treat Guillain-Barre Syndrome (GBS), warm autoimmune hemolytic anemia (wAIHA), Huntingtons Disease (HD) and ALS. Phase 2a trials in patients with HD and ALS and a Phase 2 trial in patients with wAIHA are planned for 2H 2020. A Phase 2/3 trial in patients with GBS is expected to begin in early 2021. -- ANX009, an investigational, subcutaneous formulation of an antigen-binding fragment (Fab), is being evaluated to treat systemic antibody-mediated autoimmune diseases. A Phase 1 first-in-human trial is expected to begin in 2020. -- ANX007, a clinical-stage investigational monoclonal antibody Fab for the treatment of patients with complement-mediated neurodegenerative ophthalmic diseases, is being evaluated to treat geographic atrophy. A Phase 2 trial is expected to begin in 2021.

Second Quarter 2020 Financial Results:

-- Cash and cash equivalents: Cash and cash equivalents were $124.8 million as of June 30, 2020 compared to $43.9 million as of December 31, 2019. -- Research and development (R&D) expenses: R&D expenses were $9.3 million for the quarter ended June 30, 2020 compared to $6.0 million for the quarter ended June 30, 2019. -- General and administrative (G&A) expenses: G&A expenses were $2.9 million for the quarter ended June 30, 2020 compared to $2.2 million for the quarter ended June 30, 2019. -- Net loss: Net loss attributable to common stockholders was $12.5 million or $28.87 per share for the quarter ended June 30, 2020 compared to $9.7 million or $22.30 per share for the quarter ended June 30, 2019.

About Annexon, Inc.

Annexon is a clinical-stage biopharmaceutical company developing a pipeline of novel therapies for patients with classical complement-mediated disorders of the body, brain and eye. The companys pipeline is based on its platform technology addressing well-researched classical complement-mediated autoimmune and neurodegenerative disease processes, both of which are triggered by aberrant activation of C1q, the initiating molecule of the classical complement pathway. The companys first product candidate, ANX005, is a full-length monoclonal antibody formulated for intravenous administration in autoimmune and neurodegenerative disorders. The companys second product candidate, ANX007, is a monoclonal antibody Fab formulated for intravitreal administration for the treatment of neurodegenerative ophthalmic disorders. Annexon is advancing its current programs while evaluating additional orphan and large market indications. Annexon is deploying a disciplined, biomarker-driven development strategy designed to establish that its product candidates are engaging the target at a well-tolerated therapeutic dose in the intended patient tissue. For more information, visitwww.annexonbio.com.

Forward Looking Statements

This press release contains forward-looking statements within the meaning of Section 27A of the Securities Act of 1933, as amended (Securities Act), and Section 21E of the Securities Exchange Act of 1934, as amended. In some cases, you can identify forward-looking statements by terminology such as aim, anticipate, assume, believe, contemplate, continue, could, design, due, estimate, expect, goal, intend, may, objective, plan, positioned, potential, predict, seek, should, target, will, would and other similar expressions that are predictions of or indicate future events and future trends, or the negative of these terms or other comparable terminology. All statements other than statements of historical facts contained in this press release are forward-looking statements. These forward-looking statements include, but are not limited to, statements about: advancement of the companys clinical and preclinical programs; timing and commencement of future nonclinical studies and clinical trials and research and development programs; and the implementation of the companys business model and strategic plans for its business and product candidates, including additional indications which the company may pursue. Forward-looking statements are not guarantees of future performance and are subject to risks and uncertainties that could cause actual results and events to differ materially from those anticipated, including, but not limited to, risks and uncertainties related to: the companys history of net operating losses; the companys ability to obtain necessary capital to fund its clinical programs; the early stages of clinical development of the companys product candidates; the effects of COVID-19 or other public health crises on the companys clinical programs and business operations; the companys ability to obtain regulatory approval of and successfully commercialize its product candidates; any undesirable side effects or other properties of the companys product candidates; the companys reliance on third-party suppliers and manufacturers; the outcomes of any future collaboration agreements; and the companys ability to adequately maintain intellectual property rights for its product candidates. These and other risks are described in greater detail under the section titled Risk Factors contained in the companys prospectus filed with the Securities and Exchange Commission (SEC) on July 24, 2020 pursuant to Rule 424(b) under the Securities Act and the companys other filings with the SEC. Any forward-looking statements that the company makes in this press release are made pursuant to the Private Securities Litigation Reform Act of 1995, as amended, and speak only as of the date of this press release. Except as required by law, the company undertakes no obligation to publicly update any forward-looking statements, whether as a result of new information, future events or otherwise.

ANNEXON, INC. Condensed Consolidated Statements of Operations (in thousands, except share and per share amounts)(Unaudited)

Three Months Ended Six Months Ended June 30, June 30, 2020 2019 2020 2019 Operating expenses:Research and $ $ $ $ development ^(1) 9,287 5,987 19,504 10,640General andadministrative ^ 2,950 2,230 5,189 3,679 (1) Total operating 12,237 8,217 24,693 14,319 expenses Loss from (12,237 ) (8,217 ) (24,693 ) (14,319 )operationsLoss onremeasurement ofredeemable ? (1,560 ) ? (4,330 )convertiblepreferredstock liabilityOther income, 1 376 116 597 net Net loss before (12,236 ) (9,401 ) (24,577 ) (18,052 )taxesProvision for 4 ? 4 1 income taxes Net loss (12,240 ) (9,401 ) (24,581 ) (18,053 )Accretion onredeemable 281 272 560 534 convertiblepreferred stock Net lossattributable to $ ) $ ) $ ) $ )common (12,521 (9,673 (25,141 (18,587stockholders Net loss pershareattributable to common $ (28.87 ) $ (22.30 ) $ (57.96 ) $ (42.90 )stockholders,basic anddiluted Weighted-averageshares used incomputing netloss per shareattributable to 433,749 433,749 433,749 433,232 commonstockholders,basic anddiluted

^(1) Includes the following stock-based compensation expense:Research and development 335 135 660 232General and administrative 428 302 766 671

ANNEXON, INC. Condensed Consolidated Balance Sheets (in thousands)(Unaudited)

June 30, December 2020 31, 2019Assets Current assets: Cash and cash equivalents $ $ 124,761 43,931Prepaid expenses and other current assets 907 1,475 Total current assets 125,668 45,406 Property and equipment, net 2,048 2,138 Other long-term assets 3,371 2,354 Total assets $ $ 131,087 49,898 Liabilities, Redeemable Convertible Preferred Stock and Stockholders? DeficitCurrent liabilities: Accounts payable $ $ 3,064 2,371Accrued liabilities 9,218 2,194 Deferred rent, current 378 366 Total current liabilities 12,660 4,931 Deferred rent 1,247 1,437 Total liabilities 13,907 6,368 Redeemable convertible preferred stock 235,054 143,984 Stockholders? Deficit: Common stock 4 4 Additional paid-in capital 9,365 2,202 Accumulated other comprehensive loss (82 ) (80 )Accumulated deficit (127,161 ) (102,580 ) Total stockholders? deficit (117,874 ) (100,454 ) Total liabilities, redeemable convertible preferred $ $ stock and stockholders? deficit 131,087 49,898

Investor Contact:Sylvia Wheelerswheeler@wheelhouselsa.com

Alexandra Santosasantos@wheelhouselsa.com

Media Contact:Caroline Rufocrufo@macbiocom.com