BIO Bio-Rad Laboratories, Inc.

NYSE
$379.03

Bio-Rad Laboratories, Inc. (BIO) Hedge Fund Activity

This view isolates hedge funds from the broader institutional ownership shown on the Institutional tab. A pension fund tracking an index may have no view on a stock; when a hedge fund builds or exits a position, that decision can carry information. This page measures those changes. Positions as of June 30, 2026.

Based on quarterly 13F long-equity filings. Changes compare reported quarter-end positions; filings can be reported up to 45 days later and do not represent a fund's complete exposure.

Hedge fund breadth
+20.00
12 buyers / 8 sellers
BUYING
Funds compared
21
funds with comparable BIO positions
17 current holders · 17 prior-quarter holders
Net share change
+42.9K
+271.1K added, -228.3K cut
Position activity
4 new 8 increased 4 reduced 4 exited

Most significant moves

Ranked by conviction, not size — how much of the fund's own book the position represents, how far it moved, and what kind of fund made it.

Fund Action Shares changed Change Est. value Portfolio wt. Score
Select Equity Group Long/Short Growth Sold Out -48.4K -100.0% $14.2M 0.0% 62
Bridgewater Associates Quant Macro Sold Out -1.7K -100.0% $494.4K 0.0% 61
Squarepoint Ops LLC Quant New +8.4K — $2.5M 0.0% 57
MILLENNIUM MANAGEMENT LLC Increased +56.6K +1718.3% $16.6M 0.0% 55
Caxton Associates Macro New +13.9K — $4.1M 0.1% 55
Quadrature Capital Quant New +7.1K — $2.1M 0.0% 55
D. E. Shaw & Co., Inc. Quant Increased +11.1K +136.4% $3.3M 0.0% 54
CenterBook Partners Long/Short Quant Sold Out -7.8K -100.0% $2.3M 0.0% 51
Portolan Capital Management Long/Short Increased +28.4K +200.7% $8.4M 0.5% 50
Tudor Investment Corporation Macro Increased +19.8K +384.4% $5.8M 0.0% 50

Most significant buyers

By move score, not size.

  • Squarepoint Ops LLC New · +8.4K
  • MILLENNIUM MANAGEMENT LLC Increased · +56.6K
  • Caxton Associates New · +13.9K
  • Quadrature Capital New · +7.1K
  • D. E. Shaw & Co., Inc. Increased · +11.1K

Most significant sellers

By move score, not size.

  • Select Equity Group Sold Out · -48.4K
  • Bridgewater Associates Sold Out · -1.7K
  • CenterBook Partners Sold Out · -7.8K
  • Man Group Reduced · -66.0K
  • Boothbay Fund Management Sold Out · -1.6K

Hedge fund positions

Fund Tier Shares Previous Change Change % Portfolio wt. Action Score
Select Equity Group 1 0 48.4K -48.4K -100.0% 0.0% Sold Out 62
Bridgewater Associates 1 0 1.7K -1.7K -100.0% 0.0% Sold Out 61
Squarepoint Ops LLC 2 8.4K 0 +8.4K — 0.0% New 57
MILLENNIUM MANAGEMENT LLC 2 59.9K 3.3K +56.6K +1718.3% 0.0% Increased 55
Caxton Associates 3 13.9K 0 +13.9K — 0.1% New 55
Quadrature Capital 3 7.1K 0 +7.1K — 0.0% New 55
D. E. Shaw & Co., Inc. 1 19.3K 8.1K +11.1K +136.4% 0.0% Increased 54
CenterBook Partners 4 0 7.8K -7.8K -100.0% 0.0% Sold Out 51
Portolan Capital Management 3 42.6K 14.2K +28.4K +200.7% 0.5% Increased 50
Tudor Investment Corporation 2 25.0K 5.2K +19.8K +384.4% 0.0% Increased 50
Man Group 3 1.4K 67.4K -66.0K -97.9% 0.0% Reduced 50
AQR Capital Management 3 192.7K 94.5K +98.2K +103.8% 0.0% Increased 49
Boothbay Fund Management 4 0 1.6K -1.6K -100.0% 0.0% Sold Out 49
Brevan Howard Capital Management 3 13.7K 3.9K +9.8K +254.0% 0.1% Increased 46
CITADEL ADVISORS LLC 1 60.8K 148.7K -87.9K -59.1% 0.0% Reduced 46
Quantbot Technologies 4 1.2K 0 +1.2K — 0.0% New 45
Aquatic Capital Management 4 2.7K 91 +2.7K +2920.9% 0.0% Increased 42
MARSHALL WACE, LLP 2 19.0K 33.2K -14.2K -42.9% 0.0% Reduced 38
Gotham Asset Management, LLC 2 166.3K 152.4K +13.9K +9.1% 0.1% Increased 28
TWO SIGMA INVESTMENTS, LP 2 10.3K 11.0K -668 -6.1% 0.0% Reduced 27
Deerfield Management 1 226.1K 226.1K 0 +0.0% 0.8% Unchanged 29

Every fund above opens. Subscribers can see any manager's whole portfolio — every position, its weight, and what they bought, trimmed and exited last quarter.

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Hedge funds are identified from their 13F filings, which are due 45 days after quarter end and cover long U.S.-listed equity positions only. A fund's short book never appears, so a reduced position can mean a changed view or a changed hedge — the filing doesn't say which.