4 institutions reported holding $10.8M of KILROY REALTY CORP (KRC-PG) in SEC 13F filings for 2026-06-30. Largest institutional holders: LANDMARK INVESTMENT PARTNERS, L.P. ($8.6M), GROUP ONE TRADING LLC ($824,340), SIMPLEX TRADING, LLC ($798,111), IMC-Chicago, LLC ($610,761). Source: SEC Form 13F.
| Rank | Institution | Value | Shares | Change |
|---|---|---|---|---|
| 1 | LANDMARK INVESTMENT PARTNERS, L.P. | $8.6M | 240,000 | New |
| 2 | GROUP ONE TRADING LLC | $824,340 | 22,000 | Trimmed |
| 3 | SIMPLEX TRADING, LLC | $798,111 | 21,300 | Added |
| 4 | IMC-Chicago, LLC | $610,761 | 16,300 | New |
Source: SEC Form 13F filings · as of 2026-06-30