PHILLIPS 66 (PSX) Stock Institutional Trading Activity
PHILLIPS 66 (PSX) position changes reported by tracked institutional filers across multiple SEC 13F reporting periods. Based on recent SEC 13F filings (Q4 2025), investors with some of the largest reported share count changes include Mairs & Power Growth Fund, Cullen Value Fund, Renaissance Technologies LLC, Torray Fund, and Sequoia Financial Advisors. Explore insights into buying and selling patterns, position changes, and investment conviction levels to understand institutional trading behavior and market dynamics.
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- PHILLIPS 66 (PSX) stock institutional ownership
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| Portfolio quarter | Name | Type | Quantity | Remaining | Reported stock balance |
|---|---|---|---|---|---|
| Q4 2019 | Tweedy, Browne Co All Funds (US) | Sell | -419 | 364,329 | $40,590 |
| Q4 2019 | Renaissance Technologies LLC | Buy | 1,715,002 | 1,922,902 | $214,231 |
| Q3 2019 | Dodge & Cox Stock Fund | Sell | -100 | 5,105 | $523 |
| Q3 2019 | Mairs & Power Growth Fund | Sell | -1,000 | 20,611 | $2,111 |
| Q3 2019 | Torray Fund | Buy | 161 | 21,482 | $2,200 |
| Q3 2019 | Sequoia Financial Advisors | Sell | -722 | 7,426 | $760 |
| Q3 2019 | Renaissance Technologies LLC | Buy | 133,500 | 207,900 | $21,289 |
| Q3 2019 | Tweedy, Browne Co All Funds (US) | Sell | -1,461 | 364,748 | $37,350 |
| Q3 2019 | Berkshire Hathaway | Sell | -370,078 | 5,182,637 | $530,702 |
| Q2 2019 | Torray Fund | Buy | 3,233 | 21,321 | $1,994 |
| Q2 2019 | Sequoia Financial Advisors | Buy | 1,162 | 8,148 | $762 |
| Q2 2019 | Renaissance Technologies LLC | Sell | -555,800 | 74,400 | $6,959 |
| Q2 2019 | Tweedy, Browne Co All Funds (US) | Sell | -989 | 366,209 | $34,255 |
| Q1 2019 | Torray Fund | Buy | 1,126 | 18,088 | $1,721 |
| Q1 2019 | Mairs & Power Growth Fund | Sell | -525 | 21,611 | $2,057 |
| Q1 2019 | Sequoia Financial Advisors | Buy | 542 | 6,986 | $665 |
| Q1 2019 | Tweedy, Browne Co All Funds (US) | Sell | -1,563 | 367,198 | $34,946 |
| Q1 2019 | Renaissance Technologies LLC | Sell | -894,700 | 630,200 | $59,976 |
| Q1 2019 | Berkshire Hathaway | Sell | -6,343,127 | 5,552,715 | $528,452 |
| Q4 2018 | Torray Fund | Buy | 106 | 16,962 | $1,461 |
| Q4 2018 | Mairs & Power Growth Fund | Buy | 400 | 22,136 | $1,907 |
| Q4 2018 | Sequoia Financial Advisors | Sell | -50 | 6,444 | $555 |
| Q4 2018 | Tweedy, Browne Co All Funds (US) | Sell | -1,241 | 368,761 | $31,769 |
| Q4 2018 | Renaissance Technologies LLC | Buy | 540,900 | 1,524,900 | $131,370 |
| Q4 2018 | Berkshire Hathaway | Sell | -3,537,182 | 11,895,842 | $1,024,826 |
| Q3 2018 | Torray Fund | Buy | 1,710 | 16,856 | $1,900 |
| Q3 2018 | Sequoia Financial Advisors | Buy | 72 | 6,494 | $732 |
| Q3 2018 | Tweedy, Browne Co All Funds (US) | Sell | -715 | 370,002 | $41,707 |
| Q3 2018 | Renaissance Technologies LLC | Buy | 794,900 | 984,000 | $110,916 |
| Q3 2018 | Berkshire Hathaway | Sell | -19,296,490 | 15,433,024 | $1,739,611 |
Frequently asked questions about PSX activity
Which institutional owners are buying PSX?
Institutional owners buying PSX include investors who have either initiated new positions or increased their existing holdings based on recent SEC 13F filings. The activity table above highlights which funds added shares in the latest reporting periods and how their positions changed over time.
What does "buy" mean in PSX activity?
"Buy" means an investor increased their reported position in PSX compared to the prior reporting period. This reflects growing exposure to PHILLIPS 66 (PSX) rather than necessarily a brand-new position (though new positions also appear as buys when prior quantity was zero).
Is institutional interest in PSX increasing?
Institutional interest in PSX can be assessed by comparing the number of tracked funds adding or increasing positions versus those trimming or exiting across the periods shown. A higher number of additions typically signals increasing participation among large filers, but it should be read alongside position sizes and the full table.