UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

WASHINGTON, DC 20549

FORM 10-Q

(Mark One)

☒ QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934

For the quarterly period ended March 31, 2022

OR

☐ TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934

Commission File Number: 001-37783

Clearside Biomedical, Inc.

(Exact Name of Registrant as Specified in its Charter)

(678) 270-3631

Registrant’s telephone number, including area code

N/A

(Former name, former address and former fiscal year, if changed since last report)

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

Indicate by check mark whether the registrant (1) has filed all reports required to be filed by Section 13 or 15(d) of the Securities Exchange Act of 1934 during the preceding 12 months (or for such shorter period that the registrant was required to file such reports), and (2) has been subject to such filing requirements for the past 90 days. Yes ☒ No ☐

Indicate by check mark whether the registrant has submitted electronically every Interactive Data File required to be submitted pursuant to Rule 405 of Regulation S-T (§ 232.405 of this chapter) during the preceding 12 months (or for such shorter period that the registrant was required to submit such files). Yes ☒ No ☐

Indicate by check mark whether the registrant is a large accelerated filer, an accelerated filer, a non-accelerated filer, a smaller reporting company, or an emerging growth company. See the definitions of “large accelerated filer,” “accelerated filer,” “smaller reporting company,” and “emerging growth company” in Rule 12b-2 of the Exchange Act.

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. ☐

Indicate by check mark whether the registrant is a shell company (as defined in Rule 12b-2 of the Exchange Act). Yes ☐ No ☒

As of May 9, 2022, the registrant had 60,150,442 shares of common stock, $0.001 par value per share, outstanding.

PART I – FINANCIAL INFORMATION

Item 1. Financial Statements

CLEARSIDE BIOMEDICAL, INC.

Balance Sheets

(in thousands, except share and per share data)

(unaudited)

See accompanying notes to the financial statements

3

CLEARSIDE BIOMEDICAL, INC.

Statements of Operations

(in thousands, except share and per share data)

(unaudited)

See accompanying notes to the financial statements.

4

CLEARSIDE BIOMEDICAL, INC.

Statements of Stockholders’ Equity

(in thousands, except share data)

(unaudited)

See accompanying notes to the financial statements.

5

CLEARSIDE BIOMEDICAL, INC.

Statements of Cash Flows

(in thousands)

(unaudited)

Reconciliation of cash, cash equivalents and restricted cash:

See accompanying notes to the financial statements.

6

CLEARSIDE BIOMEDICAL, INC.

Notes to the Financial Statements

(unaudited)

7

9

10

14

Item 2. Management’s Discussion and Analysis of Financial Condition and Results of Operations.

Certain statements contained in this Quarterly Report on Form 10-Q may constitute forward-looking statements within the meaning of Section 27A of the Securities Act of 1933, as amended, and Section 21E of the Securities Exchange Act of 1934, as amended. The words or phrases “would be,” “will allow,” “intends to,” “will likely result,” “are expected to,” “will continue,” “is anticipated,” “estimate,” “project,” or similar expressions, or the negative of such words or phrases, are intended to identify “forward-looking statements.” We have based these forward-looking statements on our current expectations and projections about future events. Because such statements include risks and uncertainties, actual results may differ materially from those expressed or implied by such forward-looking statements. Factors that could cause or contribute to these differences include those below and elsewhere in this Quarterly Report on Form 10-Q and our other filings with the Securities and Exchange Commission, or SEC, under the heading “Risk Factors”. Such risks and uncertainties may be amplified by the COVID-19 pandemic and its potential impact on our business and the global economy. Statements made herein are as of the date of the filing of this Form 10-Q with the SEC and should not be relied upon as of any subsequent date. Unless otherwise required by applicable law, we do not undertake, and we specifically disclaim, any obligation to update any forward-looking statements to reflect occurrences, developments, unanticipated events or circumstances after the date of such statement.

The following discussion and analysis of our financial condition and results of operations should be read in conjunction with our unaudited financial statements and related notes that appear in Item 1 of this Quarterly Report on Form 10-Q and with our audited financial statements and related notes for the year ended December 31, 2021 appearing in our Annual Report on Form 10-K filed with the SEC on March 11, 2022.

Overview

We are a biopharmaceutical company focused on revolutionizing the delivery of therapies to the back of the eye through the suprachoroidal space, or SCS®. Our novel SCS injection platform, utilizing our proprietary SCS Microinjector®, enables an in-office, repeatable, non-surgical procedure for the targeted and compartmentalized delivery of a wide variety of therapies to the macula, retina or choroid to potentially preserve and improve vision in patients with sight-threatening eye diseases. Our SCS injection platform can be used in conjunction with existing drugs designed for delivery to the SCS, novel therapies and future therapeutic innovations. We believe our proprietary suprachoroidal administration platform has the potential to become a standard for delivery of therapies intended to treat chorioretinal diseases.

We are leveraging our SCS injection platform by building an internal research and development pipeline targeting retinal diseases and by creating external collaborations with other companies. We are developing our own pipeline of small molecule product candidates for administration via our SCS Microinjector, and we also strategically partner with companies developing other ophthalmic therapeutic innovations to be administered using our SCS injection platform. Our first product, XIPERE® (triamcinolone acetonide injectable suspension) for suprachoroidal use, was approved by the U.S. Food and Drug Administration, or the FDA, in October 2021. Approval of XIPERE was a significant milestone for us as it is the first approved therapeutic delivered into the SCS, the first commercial product developed by us and the first therapy for macular edema associated with uveitis.

We believe that we are creating a broad therapeutic platform for developing product candidates to treat serious eye diseases.

15

The current development status of our pipeline of internal product candidates and external collaborations is summarized in the chart below:

Internal Pipeline

XIPERE

Our first product, XIPERE, is a proprietary, preservative-free suspension of the corticosteroid triamcinolone acetonide, or TA, for suprachoroidal use. Corticosteroids are the standard of care in uveitis. They are effective at treating the inflammatory aspect of ocular disease, but when delivered locally, either topically as drops, intravitreally or by periocular injection, they have been associated with significant side effects, such as cataract formation or exacerbation and elevated intraocular pressure, or IOP, which can lead to glaucoma. XIPERE is delivered into the suprachoroidal space via a novel route of administration utilizing our SCS Microinjector. XIPERE was approved by the FDA for the treatment of macular edema associated with uveitis.

We are evaluating options for potential submissions to regulatory agencies to seek regulatory approval of XIPERE for the treatment of patients with macular edema associated with uveitis in additional territories outside of territories licensed by Arctic Vison and Bausch.

CLS-AX

CLS-AX, our most advanced product candidate, is our proprietary suspension of the tyrosine kinase inhibitor axitinib for suprachoroidal injection delivered via our SCS Microinjector. CLS-AX is an inhibitor of vascular endothelial growth factor receptor-1, -2 and -3 that we believe may benefit patients who respond sub optimally to current anti-VEGF therapies. We are developing CLS-AX for administration to the SCS as a long-acting therapy for wet age-related macular degeneration, or wet AMD, a retinal degenerative disease that causes a progressive loss of central vision.

In August 2020, we announced that the FDA had accepted our Investigational New Drug application, or IND, for CLS-AX. In January 2021, we announced that the first patients had been enrolled in our Phase 1/2a clinical trial of CLS-AX, known as OASIS. In OASIS, the primary endpoints were met in Cohorts 1 and 2. CLS-AX was well tolerated with no serious adverse events; there were no treatment emergent adverse events related to aflibercept, CLS-AX or the suprachoroidal injection procedure, no dispersion of drug into the vitreous, and no adverse events related to IOP, inflammation or vasculitis. OASIS is currently enrolling patients in Cohort 3, in which each patient will receive a dose of 0.5 mg. The preliminary one-month safety data from Cohort 3 has been reviewed by our Safety Monitoring Committee and there were no dose limiting toxicities. As a result, we are now enrolling patients in Cohort 4 in which each patient will receive a dose of 1.0 mg. Our extension study follows patients in Cohort 2, Cohort 3 and Cohort 4 for up to an additional three-month period.

In addition to enrolling Cohort 4, we plan to expand enrollment in Cohort 3 and run both cohorts simultaneously. With the Cohort 3 expansion and the addition of Cohort 4, we are targeting enrollment of up to 25 patients in total from all four OASIS cohorts. The expanded enrollment will allow us to collect more CLS-AX patient data in order to help guide our selection of the most

16

appropriate dosing protocol for our planned Phase 2b clinical trial. We expect to report individual patient safety and tolerability data from both Cohort 3 and Cohort 4 as well as the complete analysis from all four dosing cohorts of the OASIS trial in the fourth quarter of 2022. We have begun planning for our Phase 2b clinical trial. We anticipate that the the final data readout from OASIS will position us to initiate activities by the end of the year for our Phase 2b trial, which will enable us to begin enrolling patients soon thereafter.

CLS-301

We have initiated another small molecule program utilizing suprachoroidal administration of an integrin inhibitor suspension, which we refer to as CLS-301. Integrins are multi-functional cell-adhesion molecules that regulate critical cellular processes. Integrins play a role in pathologic processes, such as inflammation, angiogenesis and fibrosis. Integrin inhibition has had some recent preliminary validation in preclinical models and clinical studies of diabetic macular edema and macular degeneration conducted by others. We believe that integrin inhibition could potentially serve as primary therapy, adjunctive therapy to anti-VEGF agents or secondary therapy in refractory cases of diabetic macular edema and macular degeneration. Suprachoroidal delivery of an integrin inhibitor suspension could provide targeting, compartmentalization and durability advantages over topical or intravitreal delivery, similar to what we have observed in other preclinical studies of small molecule suspensions, such as triamcinolone acetonide and axitinib. Therefore, we are assessing ocular tolerability, distribution and pharmacokinetics of our integrin inhibitor suprachoroidal suspension in a series of preclinical studies. Our initial preclinical data has shown that the agent is well-tolerated with favorable ocular distribution targeting the chorio-retina, and we have seen encouraging initial signs of durability. We are optimizing the formulation and have initiated a second preclinical study. We expect to have results from this study in the second half of 2022.

External Collaborations Pipeline

In addition to growing our internal pipeline, we are also focused on collaborating with other companies to provide access to the suprachoroidal space.

During the second half of 2019, we entered into three license and other agreements that we believe validate and expand the reach of our suprachoroidal injection platform. In October 2019, we announced that Bausch + Lomb, a division of Bausch Health Companies, Inc., or Bausch, acquired an exclusive license for the commercialization and development of XIPERE (triamcinolone acetonide injectable suspension) in the United States and Canada. Bausch launched XIPERE in the United States in the first quarter of 2022.

In October 2019, REGENXBIO Inc., or REGENXBIO, exercised its option to license our SCS Microinjector technology for in-office delivery of adeno-associated virus, or AAV,-based therapeutics to the SCS to potentially treat AMD, diabetic retinopathy and certain other conditions for which chronic anti-VEGF treatment is currently the standard of care. REGENXBIO is currently conducting two multi-center, open-label, randomized, controlled, dose-escalation Phase 2 clinical trials evaluating the efficacy, safety and tolerability of suprachoroidal delivery of RGX-314 using our SCS Microinjector technology: a Phase 2 trial entitled AAVIATE for the treatment of wet AMD and a second Phase 2 trial entitled ALTITUDE for the treatment of diabetic retinopathy. REGENXBIO has reported positive initial data from both clinical trials. Both ALTITUDE and AAVIATE continue to enroll in the next cohorts.

In July 2019, Aura Biosciences, or Aura, licensed our SCS Microinjector to deliver Aura’s proprietary drug candidates into the SCS for the potential treatment of certain ocular cancers, including choroidal melanoma. Aura is currently conducting a Phase 2 trial in choroidal melanoma comprised of an open-label, dose escalation phase and a randomized, masked dose expansion phase. Aura reported positive initial data on its Phase 2 clinical trial for the treatment of choroidal melanoma in October 2021. We expect Aura to disclose additional safety and efficacy data from this trial in 2022.

In March 2020, we entered into a license agreement, or the Arctic Vision License Agreement, with Arctic Vision (Hong Kong) Limited, or Arctic Vision. Pursuant to the Arctic Vision License Agreement, we granted an exclusive license to Arctic Vision to develop, distribute, promote, market and commercialize XIPERE, subject to specified exceptions, in China, Hong Kong, Macau, Taiwan and South Korea, or the Arctic Territory. During 2021, we entered into amendments to the Arctic Vision License Agreement to expand the territories covered by the license to include India and the ASEAN Countries (Brunei, Cambodia, Indonesia, Laos, Malaysia, Myanmar, the Philippines, Singapore, Thailand, and Vietnam) and Australia and New Zealand. In December 2020, Arctic Vision announced approval of its IND for a Phase 3 clinical trial of ARVN001 (known as XIPERE in the U.S.) in China. Arctic Vision has branded ARVN001 as Arcatus. In November 2021, Arctic Vision announced dosing of the first patient in a Phase 3 clinical trial of ARVN001 for the treatment of macular edema associated with uveitis. In March 2022, Arctic Vision announced dosing of the first patient in a Phase 1 clinical trial of ARVN011 in China for the treatment of diabetic macular edema.

These partnerships enable us to expand the use of our suprachoroidal injection platform to other indications and geographies globally. Under these license agreements, we are eligible to receive up to an aggregate of more than $230 million in potential future development and sales milestones, as well as and royalties from net sales of covered products.

We have incurred net losses since our inception. In recent years, our operations have consisted primarily of conducting preclinical studies and clinical trials, raising capital and undertaking other research and development initiatives. To date, we have not generated any revenue, other than license and other revenue, and we have primarily financed our operations through public offerings

17

and private placements of our equity securities, issuances of convertible promissory notes and loan agreements. As of March 31, 2022, we had an accumulated deficit of $263.1 million. We recorded net losses of $7.6 million and $7.4 million for the three months ended March 31, 2022 and 2021, respectively. We anticipate that a substantial portion of our capital resources and efforts in the foreseeable future will be focused on completing the necessary development for and obtaining regulatory approval of our product candidates, as well as discovering compounds and developing proprietary formulations to utilize with our SCS Microinjector.

We expect to continue to incur significant and increasing operating losses at least for the next several years. We do not expect to generate significant product or license and other revenue unless and until XIPERE is successfully commercialized by our licensees or until we successfully complete development of, obtain regulatory approval for and commercialize additional product candidates, either on our own or together with a third party. Our financial results may fluctuate significantly from quarter to quarter and year to year, depending on the timing of our clinical trials and our expenditures on other research and development activities. We expect clinical trial expenses to increase in 2022 as a result of our ongoing Phase 1/2a clinical trial of CLS-AX, the preparation of a Phase 2b clinical trial of CLS-AX, as well as continuing our pipeline development. We also will continue our efforts to seek to discover, research and develop additional product candidates and regulatory approvals in additional regions for XIPERE for the treatment of macular edema associated with uveitis. Based on our current research and development plans, we expect to have sufficient resources to fund our planned operations for at least the next twelve months.

Impact of COVID-19 on Our Business

Our financial results for the three months ended March 31, 2022 were not significantly impacted by COVID-19, and we currently do not expect any material impact on our financial results for the remainder of 2022.

Components of Operating Results

Revenue

We have not generated any revenue from the sale of XIPERE, and we do not expect to generate any until Bausch has reached the first $45 million of net sales (refer to Footnote 11 to our financial statements included in this Quarterly Report on Form 10-Q) or any other product revenue unless or until we obtain regulatory approval of and commercialize our other product candidates, either on our own or with a third party. Our revenue in recent years has been generated primarily from our license agreements. We are seeking to enter into additional license and other agreements with third parties to evaluate the potential use of our proprietary SCS Microinjector with the third party’s product candidates for the treatment of various eye diseases. These agreements may include payments to us for technology access, upfront license payments, regulatory and commercial milestone payments and royalties.

Research and Development

Research and development expenses consist primarily of costs incurred for the research and development of our preclinical and clinical product candidates, which include:

We expense research and development costs to operations as incurred. These costs include preclinical activities, such as manufacturing and stability and toxicology studies, that are supportive of a product candidate itself. In addition, there are expenses related to clinical trials and similar activities for each program, including costs associated with CROs. Clinical costs are recognized based on the terms of underlying agreements, as well as an evaluation of the progress to completion of specific tasks using data such as patient enrollment, clinical site activations and additional information provided to us by our vendors about their actual costs occurred. Expenses related to activities that support more than one development program or activity, such as salaries, share-based compensation and depreciation, are not classified as direct preclinical costs or clinical costs and are separately classified as unallocated.

18

The following table shows our research and development expenses by program for the three months ended March 31, 2022 and 2021 (in thousands).

Our expenses related to clinical trials are based on estimates of patient enrollment and related expenses at clinical investigator sites as well as estimates for the services received and efforts expended under contracts with research institutions, consultants and CROs that conduct and manage clinical trials on our behalf. We generally accrue expenses related to clinical trials based on contracted amounts applied to the level of patient enrollment and activity according to the protocol. If future timelines or contracts are modified based upon changes in the clinical trial protocol or scope of work to be performed, we would modify our estimates of accrued expenses accordingly on a prospective basis.

Research and development activities are central to our business model. Product candidates in later stages of clinical development generally have higher development costs than those in earlier stages of clinical development, primarily due to the increased size and duration of later-stage clinical trials. However, it is difficult to determine with certainty the duration and completion costs of our current or future preclinical programs and clinical trials of our product candidates, or if, when or to what extent we will generate revenues from the commercialization and sale of any of our product candidates that obtain regulatory approval. We may never succeed in achieving regulatory approval for any of our current or future product candidates.

The duration, costs and timing of clinical trials and development of our product candidates will depend on a variety of factors that may include, among others:

In addition, the probability of success for each product candidate will depend on numerous factors, including competition, manufacturing capability and commercial viability. We will determine which programs to pursue and how much to fund each program in response to the scientific and clinical success of each product candidate, as well as an assessment of each product candidate’s commercial potential.

General and Administrative

General and administrative expenses consist primarily of salaries and other related costs, including share-based compensation, for personnel in executive, finance and administrative functions. General and administrative costs historically included commercial pre-launch preparations for XIPERE, and also include facility related costs not otherwise included in research and development expenses, as well as professional fees for legal, patent, consulting, and accounting and audit services.

19

Other Income

Other income consists of the gain on the extinguishment of the PPP Loan and accrued interest and interest income earned on our cash and cash equivalents. Interest income is not considered significant to our financial statements.

Critical Accounting Policies and Significant Judgments and Estimates

Our management’s discussion and analysis of our financial condition and results of operations is based on our financial statements, which have been prepared in accordance with accounting principles generally accepted in the United States of America, or U.S. GAAP. The preparation of these financial statements requires us to make estimates, judgments and assumptions that affect the reported amounts of assets and liabilities, disclosure of contingent assets and liabilities as of the dates of the balance sheets and the reported amounts of expenses during the reporting periods. In accordance with U.S. GAAP, we evaluate our estimates and judgments on an ongoing basis. Significant estimates include assumptions used in the determination of share-based compensation and some of our research and development expenses. We base our estimates on historical experience and on various other factors that we believe are reasonable under the circumstances, the results of which form the basis for making judgments about the carrying value of assets and liabilities that are not readily apparent from other sources. Actual results may differ from these estimates under different assumptions or conditions.

We define our critical accounting policies as those accounting principles generally accepted in the United States of America that require us to make subjective estimates and judgments about matters that are uncertain and are likely to have a material impact on our financial condition and results of operations, as well as the specific manner in which we apply those principles. During the three months ended March 31, 2022, there were no significant changes to our critical accounting policies disclosed in our audited financial statements for the year ended December 31, 2021, which are included in our Annual Report on Form 10-K, as filed with the SEC on March 11, 2022.

Results of Operations for the Three Months Ended March 31, 2022 and 2021

The following table sets forth our results of operations for the three months ended March 31, 2022 and 2021.