Curbline Properties Corp美股招股说明书(2025-10-01版)

PROSPECTUS SUPPLEMENT(To Prospectus dated October1, 2025) $250,000,000 CURBLINE PROPERTIES CORP. Common Stock Curbline Properties Corp. (the “Company”) has entered into an ATM Equity Offering Sales Agreement, dated October1, 2025 (the “Equity Sales Agreement”), with Wells Fargo Securities, LLC, BNY MellonCapital Markets, LLC, BofA Securities, Inc., BTIG, LLC, Capital One Securities, Inc., Goldman Sachs& Co. LLC, Jefferies LLC, KeyBanc Capital Markets Inc., Morgan Stanley& Co. LLC, Nomura SecuritiesInternational, Inc. and StoneX Financial Inc., as sales agents (except in the case of Nomura Securities International, Inc. and StoneX Financial Inc.), principals (except in the case of Nomura Securities International, Inc.and StoneX Financial Inc.) and/or Forward Sellers (as defined below) (except in the case of BTIG, LLC and Capital One Securities, Inc.) (in any such capacity, each, an “Agent,” and, collectively, the “Agents”) and theForward Purchasers (as defined below), relating to shares of its common stock, $0.01 par value per share (“common stock”), offered by this prospectus supplement and the accompanying prospectus pursuant to acontinuous offering program. In accordance with the terms of the Equity Sales Agreement, an aggregate gross sales price of up to $250million of shares of our common stock may be offered and sold from time to timethrough the Agents, as our sales agents or, if applicable, as Forward Sellers (as defined below), or directly to the Agents, as principals. There are certain restrictions on transfer and ownership of our common stock intended to, among other things, preserve our qualification as a real estate investment trust (“REIT”) for federal income tax purposes.See “Description of Capital Stock—Restrictions on Ownership and Transfer” in the accompanying prospectus. Sales of shares of our common stock, if any, under this prospectus supplement and the accompanying prospectus may be made in (1)negotiated transactions, which may include block trades, as the Company andsuch Agent may agree or (2) “at the market” offerings (as defined in Rule 415 under the Securities Act of 1933, as amended, and the rules and regulations promulgated thereunder (the “Securities Act”)) by means ofordinary brokers’ transactions on the New York Stock Exchange (the “NYSE”) or otherwise at market prices prevailing at the time of sale, at prices related to prevailing market prices or at negotiated prices, by privatelynegotiated transactions (including block sales) or by any other methods permitted by applicable law. The Agents are not required to sell any specific number or dollar amount of shares of our common stock, but will usetheir commercially reasonable efforts as our sales agents or as Forward Sellers and subject to the terms of the Equity Sales Agreement, to sell the shares of our common stock offered by this prospectus supplement, asinstructed by us. The Equity Sales Agreement contemplates that, in addition to the issuance and sale by us of shares of our common stock to or through the Agents acting as our agents, we may enter into one or more separateforward sale agreements (each, a “forward sale agreement” and, collectively, the “forward sale agreements”), with certain of the Agents (or affiliates thereof) (in such capacity, each, a “Forward Purchaser” and,collectively, the “Forward Purchasers”). If we enter into a forward sale agreement with any Forward Purchaser, we expect that such Forward Purchaser or one of its affiliates will attempt to borrow from third parties andsell, through the relevant Agent, acting as sales agent for such Forward Purchaser (in such capacity, a “Forward Seller”), shares of our common stock to hedge such Forward Purchaser’s exposure under such forwardsale agreement. Each Forward Purchaser will be either one of the Agents or an affiliate thereof, and, unless otherwise expressly stated or the context otherwise requires, references herein to the “related” or “relevant”Forward Purchaser mean, with respect to any Agent, the affiliate of such Agent that is acting as Forward Purchaser or, if applicable, such Agent acting in its capacity as Forward Purchaser. We will not receive anyproceeds from any sale of borrowed shares of our common stock through an Agent, as Forward Seller, and all such proceeds will be paid to the relevant Forward Purchaser (or an affiliate thereof). We currently expect to fully physically settle each forward sale agreement, if any, with the relevant Forward Purchaser on one or more dates specified by us on or prior to the maturity date of such forward saleagreement, in which case we expect to receive aggregate net cash proceeds on each settlement date equal to the number of shares underlying such forward sale agreement that are being settled multiplied by the relevantforward sale price per share. However, subject to certain exceptions, we may also elect, in our sole discretion, to cash settle or net share settle all or any portion of our obligations und