13D Filings
Curbline Properties Corp.
CURB
Amendment
Ownership

6.40%

Total Shares

7,411,219

Issuer CIK

2027317

Event Date

Aug 11, 2026

Accepted

Aug 14, 2026, 05:00 PM

Reporting Persons (1)
NameType% of ClassAggregateSole VotingShared Voting
Alexander Otto
Individual
6.40%7,411,2197,411,2190
Disclosure Items (2)

Security Title

Common Stock, par value $0.01 per share

Issuer Name

Curbline Properties Corp.

Issuer Address

320 Park Avenue, New York City, NY, 10022

Percentage of Class

The information contained in Item 5(a) of the Schedule 13D is hereby amended and supplemented as follows: The Reporing Person beneficially owns 7,411,219 shares of Common Stock, representing 6.4% of the Issuer's outstanding Common Stock (based on 115,038,025 shares of Common Stock outstanding as of July 22, 2026, as reported in the Issuer's Quarterly Report on Form 10-Q, filed with the SEC on July 29, 2026).

Number of Shares

With respect to any rights or powers to vote, or to direct the vote of, or to dispose of, or to direct the disposition of, the Common Stock referenced in paragraph 5(a), Mr. Otto has sole voting power and sole dispositive power with regard to 7,411,219 shares of Common Stock.

Transactions

Other than as set forth below, the Reporting Person has not effected any transactions in the Common Stock in the last sixty days. Transaction Date Transaction Type Number of Shares Purchase Price August 4, 2026 Open Market Sale 38,788 $30.17 (1) August 5, 2026 Open Market Sale 134,269 $30.11 (2) August 6, 2026 Open Market Sale 109,366 $29.79 (3) August 7, 2026 Open Market Sale 20,475 $29.76 (4) August 12, 2026 Open Market Sale 96,311 $30.06 (5) August 13, 2026 Open Market Sale 135,612 $30.15 (6) (1) Reflects the weighted average sale price. The range of prices for such transaction is between $30.05 and $30.28. (2) Reflects the weighted average sale price. The range of prices for such transaction is between $30.06 and $30.25. (3) Reflects the weighted average sale price. The range of prices for such transaction is between $29.75 and $30.46. (4) Reflects the weighted average sale price. The range of prices for such transaction is between $29.75 and $29.81. (5) Reflects the weighted average sale price. The range of prices for such transaction is between $30.00 and $30.13. (6) Reflects the weighted average sale price. The range of prices for such transaction is between $30.00 and $30.42.

Shareholders

To the best knowledge of the Reporting Person, no person other than the Reporting Person has the right to receive or the power to direct the receipt of dividends from, or the proceeds from the sale of, the securities beneficially owned by the Reporting Person identified in this Item 5.

Date of 5% Ownership

Not applicable.

Curbline Properties Corp. — Schedule 13D | 13D Filings