Kilroy Realty Corp ownership update: D1 Capital Partners L.P. and Daniel Sundheim report beneficial ownership of 11,275,077 shares of Common Stock, representing 9.5% of the class. The filing cites 118,503,054 shares outstanding as of February 6, 2026. The statement attributes shared voting and dispositive power over the 11,275,077 shares to the reporting persons and notes that shares are held through the Investment Vehicle. The filing is executed by Amanda Hector and Daniel Sundheim on May 15, 2026.
Positive
None.
Negative
None.
Insights
D1 Capital and Daniel Sundheim report a 9.5% stake in KRC via shared power.
The filing lists 11,275,077 shares held with shared voting and dispositive power, calculated against 118,503,054 shares outstanding as of February 6, 2026. This indicates a meaningful passive stake that triggers public disclosure but is consistent with passive investor reporting.
Future disclosures may clarify trading intent or changes in shared power; subsequent Schedule 13 filings would show any material movement.
The amendment follows Schedule 13G/A disclosure conventions and attributes holdings to an investment manager and its principal.
The statement emphasizes that the Investment Manager and Mr. Sundheim "may be deemed to beneficially own" the shares held by the Investment Vehicle and includes the cautionary attribution language about Section 13. The Investment Vehicle is identified as the holder with dividend/proceeds rights.
Key compliance items: ensure accuracy of the outstanding-share anchor February 6, 2026 and timely amendments if ownership or voting/dispositive arrangements change.
Key Figures
Reported shares owned:11,275,077 sharesPercent of class:9.5%Shares outstanding:118,503,054 shares+2 more
5 metrics
Reported shares owned11,275,077 sharesAmount beneficially owned by D1 Capital/ Daniel Sundheim
Percent of class9.5%Calculated using shares outstanding as of Feb 6, 2026
Shares outstanding118,503,054 sharesShares outstanding as of <date>February 6, 2026</date> (source: Company 10-K)
CUSIP49427F108Kilroy Realty Corp Common Stock CUSIP
Filing execution dateMay 15, 2026Signature dates for the amendment
Beneficially own means having the economic rights and risks of a security—such as the right to receive dividends, sell the shares, or profit from price changes—whether or not your name appears on the official share register. Think of it like renting a car: you use it and reap the benefits even if the title lists someone else. Investors care because beneficial ownership determines who truly controls value, must be disclosed under securities rules, and can signal potential influence or trading activity that affects a stock’s price.
Schedule 13G/Aregulatory
"(Amendment No. 2 ) Kilroy Realty Corp"
A Schedule 13G/A is an amended public filing with the U.S. securities regulator that updates a previous Schedule 13G, disclosing when an individual or group holds a substantial (typically over 5%) stake in a company and is claiming a passive, non‑controlling intent. Investors monitor these updates because rising or falling holdings can signal changing confidence, potential future moves, or shifts in voting power — like watching a public ledger where large shareholders quietly adjust their positions.
What stake does D1 Capital report in Kilroy Realty (KRC)?
D1 Capital and Daniel Sundheim report beneficial ownership of 11,275,077 shares, equal to 9.5% of the class based on 118,503,054 shares outstanding as of February 6, 2026. The shares are shown as held through the Investment Vehicle.
How is voting and dispositive power reported for the KRC shares?
The filing shows 0 sole voting power and 11,275,077 shared voting power, with corresponding shared dispositive power. Those figures are reported on the cover page and incorporated by reference into Item 4 of the statement.
Who holds the KRC shares according to this Schedule 13G/A amendment?
The Schedule 13G/A attributes the shares to an Investment Vehicle managed by D1 Capital Partners L.P., with Daniel Sundheim as the individual who indirectly controls the Investment Manager and may be deemed to beneficially own the shares.
What outstanding share count does the filing use to calculate percentage ownership?
The percent calculation uses 118,503,054 shares outstanding as reported in Kilroy Realty's Form 10-K for the year ended December 31, 2025, and cited as of February 6, 2026, producing the reported 9.5% ownership figure.
When was the Schedule 13G/A amendment signed for Kilroy Realty?
The amendment is signed by Amanda Hector and Daniel Sundheim with signature dates of May 15, 2026. The cover page shows the ownership snapshot and accompanying disclosure language incorporated into the filing.
SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549
SCHEDULE 13G
UNDER THE SECURITIES EXCHANGE ACT OF 1934
(Amendment No. 2)
Kilroy Realty Corp
(Name of Issuer)
Common Stock, par value $0.01 per share
(Title of Class of Securities)
49427F108
(CUSIP Number)
03/31/2026
(Date of Event Which Requires Filing of this Statement)
Check the appropriate box to designate the rule pursuant to which this Schedule is filed:
Rule 13d-1(b)
Rule 13d-1(c)
Rule 13d-1(d)
schemaVersion:
SCHEDULE 13G
CUSIP Number(s):
49427F108
1
Names of Reporting Persons
D1 Capital Partners L.P.
2
Check the appropriate box if a member of a Group (see instructions)
(a)
(b)
3
Sec Use Only
4
Citizenship or Place of Organization
DELAWARE
Number of Shares Beneficially Owned by Each Reporting Person With:
5
Sole Voting Power
0.00
6
Shared Voting Power
11,275,077.00
7
Sole Dispositive Power
0.00
8
Shared Dispositive Power
11,275,077.00
9
Aggregate Amount Beneficially Owned by Each Reporting Person
11,275,077.00
10
Check box if the aggregate amount in row (9) excludes certain shares (See Instructions)
11
Percent of class represented by amount in row (9)
9.5 %
12
Type of Reporting Person (See Instructions)
IA, PN
SCHEDULE 13G
CUSIP Number(s):
49427F108
1
Names of Reporting Persons
Daniel Sundheim
2
Check the appropriate box if a member of a Group (see instructions)
(a)
(b)
3
Sec Use Only
4
Citizenship or Place of Organization
UNITED STATES
Number of Shares Beneficially Owned by Each Reporting Person With:
5
Sole Voting Power
0.00
6
Shared Voting Power
11,275,077.00
7
Sole Dispositive Power
0.00
8
Shared Dispositive Power
11,275,077.00
9
Aggregate Amount Beneficially Owned by Each Reporting Person
11,275,077.00
10
Check box if the aggregate amount in row (9) excludes certain shares (See Instructions)
11
Percent of class represented by amount in row (9)
9.5 %
12
Type of Reporting Person (See Instructions)
HC, IN
SCHEDULE 13G
Item 1.
(a)
Name of issuer:
Kilroy Realty Corp
(b)
Address of issuer's principal executive offices:
12200 W. Olympic Blvd., Suite 200, Los Angeles, CA 90064
Item 2.
(a)
Name of person filing:
This statement is filed by D1 Capital Partners L.P. (the "Investment Manager") and Daniel Sundheim (the "Mr. Sundheim"). The foregoing persons are hereinafter sometimes referred to as the "Reporting Persons."
The Investment Manager is a registered investment adviser and serves as the investment manager of private investment vehicles and accounts, including D1 Capital Partners Master LP (the "Investment Vehicle"), and may be deemed to beneficially own the shares of common stock, par value $0.01 per share (the "Common Stock") of Kilroy Realty Corp (the "Company") held by the Investment Vehicle and/or its subsidiary. Mr. Sundheim indirectly controls the Investment Manager and may be deemed to beneficially own the shares of Common Stock issuable held by the Investment Vehicle and/or its subsidiary.
The filing of this statement should not be construed as an admission that any Reporting Person is, for the purposes of Section 13 of the Securities Exchange Act of 1934, as amended, the beneficial owner of the securities reported herein.
(b)
Address or principal business office or, if none, residence:
D1 Capital Partners L.P.
9 West 57th Street, 36th Floor
New York, New York 10019
Daniel Sundheim
c/o D1 Capital Partners L.P.
9 West 57th Street, 36th Floor
New York, New York 10019
(c)
Citizenship:
Investment Manager - Delaware
Mr. Sundheim - United States of America
(d)
Title of class of securities:
Common Stock, par value $0.01 per share
(e)
CUSIP No.:
49427F108
Item 3.
If this statement is filed pursuant to §§ 240.13d-1(b) or 240.13d-2(b) or (c), check whether the person filing is a:
(a)
Broker or dealer registered under section 15 of the Act (15 U.S.C. 78o);
(b)
Bank as defined in section 3(a)(6) of the Act (15 U.S.C. 78c);
(c)
Insurance company as defined in section 3(a)(19) of the Act (15 U.S.C. 78c);
(d)
Investment company registered under section 8 of the Investment Company Act of 1940 (15 U.S.C. 80a-8);
(e)
An investment adviser in accordance with § 240.13d-1(b)(1)(ii)(E);
(f)
An employee benefit plan or endowment fund in accordance with § 240.13d-1(b)(1)(ii)(F);
(g)
A parent holding company or control person in accordance with § 240.13d-1(b)(1)(ii)(G);
(h)
A savings associations as defined in Section 3(b) of the Federal Deposit Insurance Act (12 U.S.C. 1813);
(i)
A church plan that is excluded from the definition of an investment company under section 3(c)(14) of the Investment Company Act of 1940 (15 U.S.C. 80a-3);
(j)
A non-U.S. institution in accordance with § 240.13d-1(b)(1)(ii)(J). If filing as a non-U.S. institution in accordance with § 240.13d-1(b)(1)(ii)(J),
please specify the type of institution:
(k)
Group, in accordance with Rule 240.13d-1(b)(1)(ii)(K).
Item 4.
Ownership
(a)
Amount beneficially owned:
The information required by Item 4(a) is set forth in Row 9 of the cover page for each of the Reporting Persons and is incorporated herein by reference.
The percentage set forth in this Schedule 13G is calculated based upon an aggregate of 118,503,054 shares of Common Stock reported to be outstanding as of February 6, 2026, as reported in the Company's Annual Report on Form 10-K for the year ended December 31, 2025, filed with the Securities and Exchange Commission on February 11, 2026.
(b)
Percent of class:
9.5%
(c)
Number of shares as to which the person has:
(i) Sole power to vote or to direct the vote:
The information required by Item 4(c)(i) is set forth in Row 5 of the cover page for each of the Reporting Persons and is incorporated herein by reference.
(ii) Shared power to vote or to direct the vote:
The information required by Item 4(c)(ii) is set forth in Row 6 of the cover page for each of the Reporting Persons and is incorporated herein by reference.
(iii) Sole power to dispose or to direct the disposition of:
The information required by Item 4(c)(iii) is set forth in Row 7 of the cover page for each of the Reporting Persons and is incorporated herein by reference.
(iv) Shared power to dispose or to direct the disposition of:
The information required by Item 4(c)(iv) is set forth in Row 8 of the cover page for each of the Reporting Persons and is incorporated herein by reference.
Item 5.
Ownership of 5 Percent or Less of a Class.
Not Applicable
Item 6.
Ownership of more than 5 Percent on Behalf of Another Person.
If any other person is known to have the right to receive or the power to direct the receipt of dividends from, or the proceeds from the sale of, such securities, a statement to that effect should be included in response to this item and, if such interest relates to more than 5 percent of the class, such person should be identified. A listing of the shareholders of an investment company registered under the Investment Company Act of 1940 or the beneficiaries of employee benefit plan, pension fund or endowment fund is not required.
See Item 2(a). The Investment Vehicle (and/or its subsidiary) has the right to receive and the power to direct the receipt of dividends from, and the proceeds from the sale of, the shares of Common Stock reported herein.
Item 7.
Identification and Classification of the Subsidiary Which Acquired the Security Being Reported on by the Parent Holding Company or Control Person.
Not Applicable
Item 8.
Identification and Classification of Members of the Group.
Not Applicable
Item 9.
Notice of Dissolution of Group.
Not Applicable
Item 10.
Certifications:
By signing below I certify that, to the best of my knowledge and belief, the securities referred to above were not acquired and are not held for the purpose of or with the effect of changing or influencing the control of the issuer of the securities and were not acquired and are not held in connection with or as a participant in any transaction having that purpose or effect, other than activities solely in connection with a nomination under ?? 240.14a-11.
SIGNATURE
After reasonable inquiry and to the best of my knowledge and belief, I certify that the information set forth in this statement is true, complete and correct.
D1 Capital Partners L.P.
Signature:
/s/ Amanda Hector
Name/Title:
Amanda Hector, General Counsel and Chief Compliance Officer
