RUSH ISLAND MANAGEMENT, LP: KILROY REALTY CORP (KRC): Quarterly 13F Position History
As of Q1 2026, RUSH ISLAND MANAGEMENT, LP reported 4,860,742 shares of KILROY REALTY CORP (KRC), worth $137.1M and representing 9.2% of its 13F equity book. Quarter-over-quarter share count change: + 2,226,821 (+84.5%) . The position first appeared in Q3 2022 and has been disclosed across 15 13F-HR filings in Pactolio's tracked window.
- 4,860,742Shares Held (Latest Filing)
- $137.1MReported Market Value (Latest Filing)
- 9.2%Portfolio Weight (% of 13F Equity Book)
- +2,226,821Quarter-over-Quarter Share Change
- +$38.7MQuarter-over-Quarter Value Change
- 4,860,742Peak Reported Shares (Historical)
Quarterly 13F-HR Disclosure History Source: SEC 13F-HR filings, 15 quarter s
| Quarter | Shares | QoQ Share Change | Share Change (%) | Market Value | Weight | Implied Price |
|---|---|---|---|---|---|---|
| Q1 2026 | 4,860,742 | +2,226,821 | +84.5% | $137.1M | 9.2% | $28.2 |
| Q4 2025 | 2,633,921 | 157,942 | -5.7% | $98.4M | 6.2% | $37.4 |
| Q3 2025 | 2,791,863 | 1,258,211 | -31.1% | $118.0M | 8.1% | $42.3 |
| Q2 2025 | 4,050,074 | 388,665 | -8.8% | $139.0M | 9.0% | $34.3 |
| Q1 2025 | 4,438,739 | +1,731,637 | +64.0% | $145.4M | 9.3% | $32.8 |
| Q4 2024 | 2,707,102 | +2,707,102 | — | $109.5M | 7.3% | $40.5 |
| Q3 2024 | 0 | 0 | — | $0 | 0.0% | — |
| Q2 2024 | 0 | 0 | — | $0 | 0.0% | — |
| Q1 2024 | 0 | 0 | — | $0 | 0.0% | — |
| Q4 2023 | 0 | 1,125,338 | -100.0% | $0 | 0.0% | — |
| Q3 2023 | 1,125,338 | +1,125,338 | — | $35.6M | 3.2% | $31.6 |
| Q2 2023 | 0 | 0 | — | $0 | 0.0% | — |
| Q1 2023 | 0 | 402,266 | -100.0% | $0 | 0.0% | — |
| Q4 2022 | 402,266 | 78,113 | -16.3% | $15.6M | 2.8% | $38.7 |
| Q3 2022 | 480,379 | — | — | $20.2M | 4.5% | $42.1 |
Methodology & FAQ
How This Position History Is Sourced
Each row is one SEC Form 13F-HR filing disclosing this position. Share count, market value, and reported quarter are taken verbatim from the filing; portfolio weight is recomputed against the same filing's total reported equity book. Implied price-per-share is market value divided by shares — a quarter-end mark, not the manager's cost basis. See the full methodology document for the normalization rules.
When did RUSH ISLAND MANAGEMENT, LP first disclose a KRC position in 13F-HR filings?
RUSH ISLAND MANAGEMENT, LP first reported KILROY REALTY CORP (KRC) on its 13F-HR filing for the period ending 2022-09-30 (Q3 2022). The position has appeared on 15 reported quarters within Pactolio's tracked window.
What was RUSH ISLAND MANAGEMENT, LP's most recent quarter-over-quarter share-count change in KRC?
Between Q4 2025 and Q1 2026, RUSH ISLAND MANAGEMENT, LP added 2,226,821 shares of KRC (+84.5%), bringing the total reported position to 4,860,742 shares at a market value of $137.1M.
Does the implied price-per-share represent RUSH ISLAND MANAGEMENT, LP's cost basis in KRC?
No. The implied price-per-share column is the 13F-HR reported market value divided by reported share count on the filing date (end of quarter). It is a quarter-end mark, not a cost basis or transaction price. Use it as a sanity check on the value column, not as an indicator of the manager's entry or exit price.