On March 27, 2020, Equillium, Inc. (the "Company", "we" or "us") reported that it has entered into a purchase agreement (the "Purchase Agreement") with Lincoln Park Capital Fund, LLC ("Lincoln Park"), which provides that, upon the terms and subject to the conditions and limitations set forth therein, we may sell to Lincoln Park up to $15,000,000 of shares of our common stock, par value $0.0001 per share (the "Purchase Shares"), from time to time over the 36‑month term of the Purchase Agreement (Filing, 8-K, Equillium, MAR 27, 2020, View Source [SID1234555999]). Concurrently with the Purchase Agreement, we also entered into a registration rights agreement with Lincoln Park (the "Registration Rights Agreement") pursuant to which we agreed to take specified actions to register the shares of common stock that have been and may be issued to Lincoln Park under the Purchase Agreement for resale pursuant to a registration statement under the Securities Act of 1933, as amended (the "Securities Act").

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Following the satisfaction (or waiver by Lincoln Park) of certain conditions under the Purchase Agreement, we have the right, in our sole discretion, to present Lincoln Park with a purchase notice (a "Purchase Notice"), directing Lincoln Park to purchase up to 75,000 Purchase Shares per business day (a "Regular Purchase"), subject to a maximum commitment by Lincoln Park of $2,000,000 per Regular Purchase. The Purchase Agreement provides for a purchase price per Purchase Share equal to the lesser of: (i) the lowest sale price for our common stock on the Nasdaq Global Market (or any nationally recognized successor thereto) on the purchase date of such shares; and (ii) the average of the three lowest closing sale prices for our common stock on the Nasdaq Global Market (or any nationally recognized successor thereto) during the ten consecutive business days immediately preceding the purchase date of such shares.

In addition, on any date on which we submit a Purchase Notice to Lincoln Park, we also have the right, in our sole discretion, to present Lincoln Park with an accelerated purchase notice (an "Accelerated Purchase Notice") directing Lincoln Park to purchase shares of our common stock (an "Accelerated Purchase") equal to up to the lesser of: (i) three times the number of shares purchased pursuant to such Purchase Notice; and (ii) 30% of the aggregate shares of our common stock traded during all or, if certain trading volume or market price thresholds specified in the Purchase Agreement are crossed on the applicable Accelerated Purchase date, the portion of the normal trading hours on the applicable Accelerated Purchase date prior to such time that any one of such thresholds is crossed (an "Accelerated Purchase Measurement Period"), provided that Lincoln Park will not be required to buy Purchase Shares pursuant to an Accelerated Purchase Notice that was received by Lincoln Park on any business day on which the closing sale price of our common stock on the Nasdaq Global Market (or any nationally recognized successor thereto) is below $1.00 per share. The purchase price per share for each such Accelerated Purchase will be equal to the lesser of: (y) 97% of the volume-weighted average price of our common stock on the Nasdaq Global Market (or any nationally recognized successor thereto) during the applicable Accelerated Purchase Measurement Period on the applicable Accelerated Purchase date; and (z) the closing sale price of our common stock on the Nasdaq Global Market (or any nationally recognized successor thereto) on the applicable Accelerated Purchase date.

We may also direct Lincoln Park on any business day on which an Accelerated Purchase has been completed and all of the shares to be purchased thereunder have been properly delivered to Lincoln Park in accordance with the Purchase Agreement, to purchase shares of our common stock (an "Additional Accelerated Purchase") equal to up to the lesser of: (i) three times the number of shares purchased pursuant to the Regular Purchase made on such date; and (ii) 30% of the aggregate shares of our common stock traded on the Nasdaq Global Market (or any nationally recognized successor thereto) during a certain portion of the normal trading hours on the applicable Additional Accelerated Purchase date as determined in accordance with the Purchase Agreement (an "Additional Accelerated Purchase Measurement Period"), provided that the closing price of our common stock on the Nasdaq Global Market (or any nationally recognized successor thereto) on the business day immediately preceding such business day is not below $1.00. The purchase price per share for each such Additional Accelerated Purchase will be equal to the lesser of: (y) 97% of the volume-weighted average price of our common stock on the Nasdaq Global Market (or any nationally recognized successor thereto) during the applicable Additional Accelerated Purchase Measurement Period on the applicable Additional Accelerated Purchase date; and (z) the closing sale price of our common stock on the Nasdaq Global Market (or any nationally recognized successor thereto) on the applicable Additional Accelerated Purchase date.

The aggregate number of shares that we can sell to Lincoln Park under the Purchase Agreement may in no case exceed 3,523,717 shares of our common stock (which is equal to approximately 19.99% of the shares of our

common stock outstanding immediately prior to the execution of the Purchase Agreement (the "Exchange Cap"), unless: (i) we obtain stockholder approval to issue shares of our common stock above the Exchange Cap; or (ii) the average price of all applicable sales of our common stock to Lincoln Park under the Purchase Agreement equals or exceeds $2.6298 per share (which represents the closing price of our common stock on the Nasdaq Global Market immediately preceding the signing of the Purchase Agreement, plus an incremental amount) such that the transactions contemplated by the Purchase Agreement are exempt from the Exchange Cap limitation under applicable Nasdaq rules; provided that at no time shall Lincoln Park (together with its affiliates) beneficially own more than 4.99% of our issued and outstanding common stock.

The Purchase Agreement contains customary representations, warranties, covenants, closing conditions and indemnification and termination provisions. Sales under the Purchase Agreement may commence only after certain conditions have been satisfied, which conditions include the registration statement covering the resale of the shares of our common stock issued or sold by us to Lincoln Park under the Purchase Agreement shall have been declared effective under the Securities Act by the Securities and Exchange Commission, the delivery to Lincoln Park of a final prospectus covering the shares of our common stock issued or sold by us to Lincoln Park under the Purchase Agreement, approval for listing on The Nasdaq Global Market of the shares of our common stock issued or sold by us to Lincoln Park under the Purchase Agreement, the issuance of 65,374 shares of our common stock to Lincoln Park as commitment shares to Lincoln Park, and the receipt by Lincoln Park of a customary opinion of counsel and other certificates and closing documents. The Purchase Agreement may be terminated by us at any time, at our sole discretion, without any cost or penalty. Lincoln Park has covenanted not to cause or engage in any manner whatsoever, any direct or indirect short selling or hedging of our common stock. While we have agreed to reimburse Lincoln Park for a limited portion of the fees it incurred in connection with the Purchase Agreement, we did not pay any additional amounts to reimburse or otherwise compensate Lincoln Park in connection with the transaction. There are no limitations on use of proceeds, financial or business covenants, restrictions on future financings (other than restrictions on our ability to enter into variable rate transactions described in the Purchase Agreement), rights of first refusal, participation rights, penalties or liquidated damages in the Purchase Agreement. We may deliver Purchase Notices under the Purchase Agreement, subject to market conditions, and in light of our capital needs from time to time and under the limitations contained in the Purchase Agreement. Our net proceeds under the Purchase Agreement will depend on the frequency and prices at which we sell shares of our common stock to Lincoln Park. We expect that any proceeds we receive from such sales to Lincoln Park will be used for working capital and general corporate purposes.

The foregoing is a summary description of certain terms of the Purchase Agreement and the Registration Rights Agreement and, by its nature, is incomplete. Copies of the Purchase Agreement and the Registration Rights Agreement are filed as Exhibits 10.1 and 4.1 attached hereto, respectively. The foregoing descriptions of the Purchase Agreement and the Registration Rights Agreement are qualified in their entirety by reference to such exhibits.

The Purchase Agreement and Registration Rights Agreement each contain customary representations and warranties, covenants and indemnification provisions that the parties made to, and solely for the benefit of, each other in the context of all of the terms and conditions of such agreements and in the context of the specific relationship between the parties thereto. The provisions of the Purchase Agreement and Registration Rights Agreement, including any representations and warranties contained therein, are not for the benefit of any party other than the parties thereto and are not intended as documents for investors and the public to obtain factual information about the current state of affairs of the parties thereto. Rather, investors and the public should look to other disclosures contained in our annual, quarterly and current reports we may file with the Securities and Exchange Commission.