Bio-Rad Laboratories-A
Held by 4 superinvestors (BIO).
Educational data only — not investment advice. 13F positions are self-reported and can lag up to 45 days.
Bio-Rad Laboratories-A (BIO) is held by 4 of the superinvestors tracked on Compounder, with a combined $378.5M in reported 13F value. The largest position belongs to John Rogers, where it makes up 2.5% of the portfolio.
Other notable holders by value include Steven Romick (1.6% of its book), Mason Hawkins (2.2% of its book) and Ray Dalio (0.0% of its book).
Over the latest quarter, 1 of the tracked filers opened a new position in BIO, 2 added to existing ones, 1 trimmed, and 0 sold out entirely.
Holder counts and values reflect the most recent SEC Form 13F filings, through the quarter ended 2026-03-31. Source: SEC EDGAR. A 13F shows only long US-listed positions and can lag the real portfolio by up to 45 days, so this is disclosed long ownership, not a complete picture.
Superinvestors holding this security over the last 8 quarters: 3 → 4.
Early quarters may understate holder counts due to data backfill — read the slope with care.
- Value$219.1MWeight (prev→now)2.5% → 2.5% ▲
- Value$113.6MWeight (prev→now)1.6% → 1.6% ▲
- Value$45.4MWeight (prev→now)3.1% → 2.2% ▼
- Value$469,415Weight (prev→now)New · 0.0%
Sources· SEC EDGAR 13F as of 2026-05-15
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