Hound Partners, LLC BIO — BIO RAD LABS INC

Ownership history in Hound Partners, LLC  ·  22 quarters on record

AI Ownership Summary

Hound Partners, LLC reported BIO RAD LABS INC (BIO) in 22 quarterly 13F filings from 2023 Q4 through 2026 Q1. Peak portfolio weight reached 27.27% in 2024 Q1. The latest visible filing shows BIO at 3.41% 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 Hound Partners, LLC's position in BIO RAD LABS 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
2026 Q1

BIO was reported at 3.41% of portfolio in the most recent visible filing.

High-water mark
Peak Conviction
27.27% in 2024 Q1

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 2026 Q1

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 Hound Partners, LLC fund profile Hound Partners, LLC full holdings
How Hound Partners, LLC held BIO — position size vs. price
% of Fund (quarterly)    BIO price (quarter-end, indexed to 100)    SPY (indexed to 100)    QQQ (indexed to 100)
📋 Quarterly Holdings History 10 quarters  ▾
Quarter Action Sold % After 3M Timing Shares Change Chg % % of Fund Mkt Value Filed Price (Filed)
2026 Q1 ADDED — — — 97,724 +54,456 +125.9% 3.41% $27.2M 2026-05-15 $247.53
2025 Q4 REDUCED 58.4% -8.0% ✅ 43,268 -60,695 -58.4% 1.76% $13.1M 2026-02-17 $264.93
2025 Q3 REDUCED 42.9% +8.3% ❌ 103,963 -77,973 -42.9% 3.74% $29.2M 2025-11-14 $313.15
2025 Q2 REDUCED 9.8% +11.9% ❌ 181,936 -19,847 -9.8% 5.93% $43.9M 2025-08-14 $287.21
2025 Q1 ADDED — — — 201,783 +142,925 +242.8% 9.75% $49.1M 2025-05-15 $243.19
2024 Q4 REDUCED 13.9% -25.9% ✅ 58,858 -9,502 -13.9% 7.42% $19.3M 2025-02-14 $277.16
2024 Q3 REDUCED 58.5% -2.5% ✅ 68,360 -96,510 -58.5% 5.72% $22.9M 2024-11-14 $350.23
2024 Q2 REDUCED 37.7% +22.5% ❌ 164,870 -99,667 -37.7% 9.03% $45.0M 2024-08-14 $320.45
2024 Q1 ADDED — — — 264,537 +2,873 +1.1% 27.27% $91.5M 2024-05-15 $300.97
2023 Q4 ADDED — — — 261,664 +47,682 +22.3% 26.33% $84.5M 2024-02-14 $327.91
12 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

QVIDTVM Management LLC 3Y 28.68% JNE Partners LLP 3Y 10.5% Tikvah Management LLC 3Y 7Y 8.45% MANGROVE PARTNERS IM, LLC 3Y 7Y 2.86% ARIEL INVESTMENTS, LLC 3Y 7Y 2.45% SOUTHEASTERN ASSET MANAGEMENT INC/TN/ 3Y 7Y 2.23% Sivik Global Healthcare LLC 3Y 7Y 2.12% Almitas Capital LLC 3Y 7Y 1.91% First Pacific Advisors, LP 3Y 7Y 1.59% SECTOR GAMMA AS 3Y 7Y 1.56%

FAQ About Hound Partners, LLC and BIO

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

How long has Hound Partners, LLC reported owning BIO?

Hound Partners, LLC reported BIO across 10 quarterly 13F filings, from 2023 Q4 through 2026 Q1.

What was the largest reported BIO position in Hound Partners, LLC's portfolio?

The largest reported portfolio weight for BIO was 27.27% in 2024 Q1.

What is the latest reported BIO position on this page?

The most recent filing on this page is 2026 Q1, when Hound Partners, LLC reported 97,724 shares, equal to 3.41% of portfolio, with an estimated market value of $27.2M.

What does the chart on this BIO ownership page compare?

The chart compares Hound Partners, LLC'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.

How well did Hound Partners, LLC time their BIO position?

Based on 13F filing dates vs. subsequent BIO price moves, Hound Partners, LLC correctly timed 12 out of 21 reported position changes (57%). The annualised alpha on BIO relative to SPY over the holding period was -19.0%.

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