As of November 6, 2026, 4 holders' latest Schedule 13D or 13G filings report owning 5% or more of Kilroy Realty Corp. The largest reported stake is D1 Capital Partners L.P.'s, at 9.5%. 18 filings are on record since August 14, 2025 (Schedule 13G/A, May 15, 2026).
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Key facts
- · Reporting person: Cohen & Steers, Inc. · Sole voting: 1,661,434 · Shared voting: 0 · Sole dispositive: 5,769,920 · Shared dispositive: 0 · SCHEDULE 13G/A, 2026-08-14
- · Reporting person: Norges Bank · Sole voting: 2,337,471 · Shared voting: 0 · Sole dispositive: 2,337,471 · Shared dispositive: 0 · SCHEDULE 13G/A, 2026-08-12
- · Holder: Cohen & Steers, Inc. · Percent: 4.96% · SCHEDULE 13G/A
- · Holder: D1 Capital Partners L.P. · Percent: 9.5% · SCHEDULE 13G/A
- · Holder: Cohen & Steers, Inc. · Percent: 6.71% · SCHEDULE 13G/A
Kilroy Realty Corp. has 18 Schedule 13D or 13G filings on record since 2025-08-14. 4 holders' latest filing reports 5% or more of common stock. Each figure below is the holder's own, as filed, with the filing linked.
Holders
| Holder | Percent | Shares | Latest | Event date |
|---|---|---|---|---|
| D1 Capital Partners L.P. | 9.5% | 11,275,077 | SCHEDULE 13G/A, 2026-05-15 | 2026-03-31 |
| Vanguard Portfolio Management | 8.34% | 9,883,874 | SCHEDULE 13G, 2026-04-29 | 2026-03-31 |
| State Street Corporation | 5.3% | 6,256,763 | SCHEDULE 13G, 2026-05-12 | 2026-03-31 |
| Vanguard Capital Management | 5.15% | 6,111,161 | SCHEDULE 13G, 2026-04-30 | 2026-03-31 |
| Cohen & Steers, Inc. | 4.96% | 5,769,920 | SCHEDULE 13G/A, 2026-08-14 | 2026-06-30 |
| Fmr LLC | 4.2% | 4,969,074 | SCHEDULE 13G/A, 2026-02-05 | 2025-12-31 |
| Norges Bank | 2.01% | 2,337,471 | SCHEDULE 13G/A, 2026-08-12 | 2026-06-30 |
| The Vanguard Group | 0% | 0 | SCHEDULE 13G/A, 2026-03-27 | 2026-03-13 |
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More on Kilroy Realty Corp. and the records around it.
Kilroy Realty Corp. elsewhere on the record
- Leadership changes Aug 2026
- Who owns it
Companies that share a holder
- Norges Bank also filed stake reports on 36 other companies: Atour Lifestyle Holdings Ltd (Aug 2026), BXP, Inc. (Aug 2026), Cabaletta Bio, Inc. (Aug 2026)
- Cohen & Steers, Inc. also filed stake reports on 37 other companies: Omega Healthcare Investors Inc. (Nov 2026), RAYONIER INC. (Oct 2026), ARKO Petroleum Corp. (Aug 2026)
- STATE STREET CORPORATION also filed stake reports on 343 other companies: TRADE DESK INC/THE (Oct 2026), CENTRUS ENERGY CORP (Sep 2026), ACADIA PHARMACEUTICALS INC (Aug 2026)
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Voting and dispositive power, as filed
| Reporting person | Sole voting | Shared voting | Sole dispositive | Shared dispositive | Filing |
|---|---|---|---|---|---|
| Cohen & Steers, Inc. | 1,661,434 | 0 | 5,769,920 | 0 | SCHEDULE 13G/A, 2026-08-14 |
| Cohen & Steers Capital Management, Inc. | 1,661,434 | 0 | 5,769,920 | 0 | SCHEDULE 13G/A, 2026-08-14 |
| Cohen & Steers UK Limited | 0 | 0 | 0 | 0 | SCHEDULE 13G/A, 2026-08-14 |
| Cohen & Steers Asia Limited | 0 | 0 | 0 | 0 | SCHEDULE 13G/A, 2026-08-14 |
| Cohen & Steers Ireland Limited | 0 | 0 | 0 | 0 | SCHEDULE 13G/A, 2026-08-14 |
| Norges Bank | 2,337,471 | 0 | 2,337,471 | 0 | SCHEDULE 13G/A, 2026-08-12 |
The latest filing identifies Kilroy Realty Corp. by CUSIP 49427F108 and gives its principal executive office as 12200 West Olympic Blvd., Suite 200, Los Angeles, CA 90064 (SCHEDULE 13G/A, 2026-08-14).
Timeline
| Filed | Holder | Percent | Filing |
|---|---|---|---|
| 2025-08-14 | Cohen & Steers, Inc. | 14.29% | SCHEDULE 13G/A |
| 2025-10-31 | The Vanguard Group | 13.49% | SCHEDULE 13G/A |
| 2025-11-05 | Fmr LLC | 5.9% | SCHEDULE 13G |
| 2025-11-14 | D1 Capital Partners L.P. | 7.2% | SCHEDULE 13G |
| 2025-11-14 | Cohen & Steers, Inc. | 12.95% | SCHEDULE 13G/A |
| 2026-02-05 | Fmr LLC | 4.2% | SCHEDULE 13G/A |
| 2026-02-13 | Cohen & Steers, Inc. | 8.13% | SCHEDULE 13G/A |
| 2026-02-17 | D1 Capital Partners L.P. | 8.8% | SCHEDULE 13G/A |
| 2026-03-27 | The Vanguard Group | 0% | SCHEDULE 13G/A |
| 2026-04-29 | Vanguard Portfolio Management | 8.34% | SCHEDULE 13G |
| 2026-04-30 | Vanguard Capital Management | 5.15% | SCHEDULE 13G |
| 2026-05-11 | Norges Bank | 5.76% | SCHEDULE 13G/A |
| 2026-05-12 | State Street Corporation | 5.3% | SCHEDULE 13G |
| 2026-05-15 | D1 Capital Partners L.P. | 9.5% | SCHEDULE 13G/A |
| 2026-05-15 | Cohen & Steers, Inc. | 6.71% | SCHEDULE 13G/A |
| 2026-07-08 | Cohen & Steers, Inc. | 4.96% | SCHEDULE 13G/A |
| 2026-08-12 | Norges Bank | 2.01% | SCHEDULE 13G/A |
| 2026-08-14 | Cohen & Steers, Inc. | 4.96% | SCHEDULE 13G/A |
Questions about who owns Kilroy Realty Corp.
Who owns Kilroy Realty Corp.?
On this page, 4 holders' latest ownership filings report 5% or more of Kilroy Realty Corp.: D1 Capital Partners L.P. (9.5%, Schedule 13G/A, filed 2026-05-15), Vanguard Portfolio Management (8.34%, Schedule 13G, filed 2026-04-29), State Street Corporation (5.3%, Schedule 13G, filed 2026-05-12) and Vanguard Capital Management (5.15%, Schedule 13G, filed 2026-04-30).
Who are the largest shareholders of Kilroy Realty Corp.?
By the share each holder's latest filing reports, the largest holders of Kilroy Realty Corp. on this page are D1 Capital Partners L.P. (9.5%), Vanguard Portfolio Management (8.34%) and State Street Corporation (5.3%).
When did D1 Capital Partners L.P. buy into Kilroy Realty Corp.?
The filings give report dates, not purchase dates. The earliest filing from D1 Capital Partners L.P. on this page is the Schedule 13G, filed 2025-11-14, reporting 7.2%; its latest, Schedule 13G/A filed 2026-05-15, reports 9.5%.
Is this an audit or a full list?
Neither. The ownership list on this page covers only Schedule 13D and 13G filings, which holders make once they own 5% or more of a class of shares (an amendment can report a stake that has since fallen below 5%); 18 such filings are shown here. It is not an audit and not a full cap table: holders who never reached 5% are not listed, and a stake can change after its latest filing.
Also on the record for Kilroy Realty Corp.
| Date | Record | Figure | Our page | Source |
|---|---|---|---|---|
| August 11, 2026 | Leadership change: Eliott Trencher appointed, Chief Investment Officer | — | Leadership changes | Source |
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Where this comes from
Anyone who comes to own more than 5% of a class of a listed company's voting shares has to tell the SEC. A holder who may seek to change or influence the company files Schedule 13D, and has to say in Item 4, "Purpose of Transaction", what it intends to do. A holder with no such intent, such as many index and passive funds, may file the shorter Schedule 13G. Both are amended when the stake changes, including when it falls below 5%.
Every row here is one of those filings, linked to the filing itself. Percentages and share counts are exactly as the holder filed them, for the holder the filing names; an amendment showing a lower figure is shown as filed. Item 4 text is quoted word for word. Where a 13D's Item 4 contains a sentence stating a definite intent to influence the company, that sentence is marked and quoted; the page does not describe the holder or its motives beyond the words it filed. Nothing here is investment advice.