BIO — Bio-Rad Laboratories Inc

Ownership history in SOUTHEASTERN ASSET MANAGEMENT INC/TN/  ·  11 quarters on record

AI Ownership Summary

SOUTHEASTERN ASSET MANAGEMENT INC/TN/ reported Bio-Rad Laboratories Inc (BIO) in 11 quarterly 13F filings from 2023 Q4 through 2025 Q4. Peak portfolio weight reached 5.02% in 2024 Q3. The latest visible filing shows BIO at 3.07% of the fund.

This page tracks quarterly shares, estimated market value, portfolio weight, filing dates, and disclosure-aligned stock prices directly from SEC EDGAR 13F filings. Older history is available after unlock; the visible window still shows the most recent pattern.

What this BIO ownership page tells you

This page is designed to answer the real investor question behind a 13F filing: how meaningful was SOUTHEASTERN ASSET MANAGEMENT INC/TN/'s position in Bio-Rad Laboratories Inc, and how did that conviction change over time? You can read the holding window, peak weight, latest reported size, disclosure timing, and quarter-by-quarter changes without piecing the story together from raw SEC rows.

Freshest filing
Latest Reported Filing
2025 Q4

BIO was reported at 3.07% of portfolio in the most recent visible filing.

High-water mark
Peak Conviction
5.02% in 2024 Q3

Peak weight helps separate a token disclosure from a real conviction holding the fund genuinely cared about.

Time in book
Holding Window
2023 Q4 to 2025 Q4

Longer holding windows often tell a very different story from short-lived tactical trades or one-quarter experiments.

Decision context
Why It Matters
Position size beats headlines

Knowing that a fund owned a stock is useful. Knowing whether it was a 0.20% placeholder or a true high-conviction position is where the signal actually starts.

BIO stock page SOUTHEASTERN ASSET MANAGEMENT INC/TN/ fund profile SOUTHEASTERN ASSET MANAGEMENT INC/TN/ full holdings
How SOUTHEASTERN ASSET MANAGEMENT INC/TN/ held BIO — position size vs. price
% of Fund (quarterly)    BIO price (quarter-end, indexed to 100)
📋 Quarterly Holdings History 9 quarters  ▾
Quarter Action Shares Change Chg % % of Fund Mkt Value Filed Price (Filed)
2025 Q4 REDUCED 227,630 -9,624 -4.1% 3.07% $69.0M 2026-02-14 (Est.) $256.56
2025 Q3 REDUCED 237,254 -78,031 -24.7% 3.40% $66.5M 2025-11-14 $313.15
2025 Q2 REDUCED 315,285 -8,520 -2.6% 3.84% $76.1M 2025-08-14 $287.21
2025 Q1 ADDED 323,805 +15,336 +5.0% 4.20% $78.9M 2025-05-15 $243.19
2024 Q4 REDUCED 308,469 -9,867 -3.1% 4.78% $101.3M 2025-02-14 $277.16
2024 Q3 REDUCED 318,336 -6,677 -2.1% 5.02% $106.5M 2024-11-14 $350.23
2024 Q2 REDUCED 325,013 -18,946 -5.5% 3.87% $88.8M 2024-08-14 $320.45
2024 Q1 REDUCED 343,959 -20,099 -5.5% 4.57% $119.0M 2024-05-15 $300.97
2023 Q4 ADDED 364,058 +37,956 +11.6% 4.52% $117.6M 2024-02-14 $327.91
2 older quarters hidden  —  Sign in free or upgrade to Premium to see full history

🏢 Other funds also holding BIO

As of 2026 Q1 — sorted by position size

ROWLANDMILLER & PARTNERS.ADV 3Y 7Y 0.03% GAMMA Investing LLC 0.02% Versant Capital Management, Inc 3Y 7Y 0.01% PARK AVENUE SECURITIES LLC 3Y 7Y 0.01% HIGHLINE WEALTH PARTNERS LLC 0.0% Ares Financial Consulting, LLC 0.0% SIGNATUREFD, LLC 3Y 7Y 0.0% WEALTH ENHANCEMENT ADVISORY SERVICES, LLC 3Y 7Y 0.0% Farther Finance Advisors, LLC 0.0% Grove Bank & Trust 3Y 7Y 0.0%

FAQ About SOUTHEASTERN ASSET MANAGEMENT INC/TN/ and BIO

These are the practical questions this page is built to answer before you even open the full history table.

How long has SOUTHEASTERN ASSET MANAGEMENT INC/TN/ reported owning BIO?

SOUTHEASTERN ASSET MANAGEMENT INC/TN/ reported BIO across 9 quarterly 13F filings, from 2023 Q4 through 2025 Q4.

What was the largest reported BIO position in SOUTHEASTERN ASSET MANAGEMENT INC/TN/'s portfolio?

The largest reported portfolio weight for BIO was 5.02% in 2024 Q3.

What is the latest reported BIO position on this page?

The most recent filing on this page is 2025 Q4, when SOUTHEASTERN ASSET MANAGEMENT INC/TN/ reported 227,630 shares, equal to 3.07% of portfolio, with an estimated market value of $69.0M.

What does the chart on this BIO ownership page compare?

The chart compares SOUTHEASTERN ASSET MANAGEMENT INC/TN/'s quarterly BIO portfolio weight with the stock's indexed share price, so you can see whether the fund was building, trimming, or holding the position as price moved.

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