BIO-RAD LABORATORIES-A (BIO) Stock Institutional Trading Activity
BIO-RAD LABORATORIES-A (BIO) 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 Ariel Appreciation Fund, Longleaf Partners, First Eagle U.S. Value, Parnassus Endeavor Fund, and Meritage Group. 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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- BIO-RAD LABORATORIES-A (BIO) stock institutional ownership
- BIO-RAD LABORATORIES-A (BIO) stock insider trading activity
- Stock rankings
| Portfolio quarter | Name | Type | Quantity | Remaining | Reported stock balance |
|---|---|---|---|---|---|
| Q1 2015 | Ariel Appreciation Fund | Buy | 80,575 | 1,141,142 | $154,260 |
| Q1 2015 | Renaissance Technologies LLC | Buy | 35,000 | 117,200 | $15,843 |
| Q4 2014 | Ariel Appreciation Fund | Sell | -6,659 | 1,060,567 | $127,862 |
| Q4 2014 | Renaissance Technologies LLC | Buy | 7,700 | 82,200 | $9,910 |
| Q3 2014 | Ariel Appreciation Fund | Buy | 83,774 | 1,067,226 | $121,023 |
| Q3 2014 | Renaissance Technologies LLC | Buy | 13,000 | 74,500 | $8,448 |
| Q2 2014 | Ariel Appreciation Fund | Sell | -41,277 | 983,452 | $117,729 |
| Q2 2014 | Renaissance Technologies LLC | Buy | 31,730 | 61,500 | $7,362 |
| Q1 2014 | Ariel Appreciation Fund | Sell | -77,878 | 1,024,729 | $131,288 |
| Q1 2014 | Renaissance Technologies LLC | Buy | 870 | 29,770 | $3,814 |
| Q4 2013 | Ariel Appreciation Fund | Buy | 5,994 | 1,102,607 | $136,293 |
| Q4 2013 | Renaissance Technologies LLC | Sell | -42,800 | 28,900 | $3,572 |
| Q3 2013 | Ariel Appreciation Fund | Buy | 84,207 | 1,096,613 | $128,918 |
| Q3 2013 | Renaissance Technologies LLC | Sell | -31,500 | 71,700 | $8,429 |
| Q2 2013 | Ariel Appreciation Fund | Buy | 1,012,406 | 1,012,406 | $113,592 |
| Q2 2013 | Renaissance Technologies LLC | Buy | 103,200 | 103,200 | $11,579 |
Frequently asked questions about BIO activity
Which institutional owners are buying BIO?
Institutional owners buying BIO 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 BIO activity?
"Buy" means an investor increased their reported position in BIO compared to the prior reporting period. This reflects growing exposure to BIO-RAD LABORATORIES-A (BIO) rather than necessarily a brand-new position (though new positions also appear as buys when prior quantity was zero).
Is institutional interest in BIO increasing?
Institutional interest in BIO 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.