OSIS OSI Systems, Inc.

NASDAQ
$204.29

OSI Systems, Inc. (OSIS) 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
+30.00
13 buyers / 7 sellers
STRONG BUYING
Funds compared
21
funds with comparable OSIS positions
17 current holders · 14 prior-quarter holders
Net share change
+323.0K
+352.8K added, -29.8K cut
Position activity
7 new 6 increased 3 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
Bridgewater Associates Quant Macro Sold Out -3.2K -100.0% $702.9K 0.0% 61
CITADEL ADVISORS LLC Quant Sold Out -14.9K -100.0% $3.3M 0.0% 60
MILLENNIUM MANAGEMENT LLC Increased +254.9K +584.4% $55.7M 0.1% 57
Divisadero Street Capital Management Long/Short New +27.9K — $6.1M 0.1% 57
Weiss Asset Management Event Quant New +18.6K — $4.1M 0.1% 56
D. E. Shaw & Co., Inc. Quant Increased +13.3K +182.8% $2.9M 0.0% 54
Trexquant Investment Quant New +13.1K — $2.9M 0.0% 53
Jain Global Long/Short Quant New +1.9K — $422.3K 0.0% 52
Walleye Capital Long/Short Quant Sold Out -217 -100.0% $47.5K 0.0% 51
Boothbay Fund Management New +7.0K — $1.5M 0.0% 51

Most significant buyers

By move score, not size.

  • MILLENNIUM MANAGEMENT LLC Increased · +254.9K
  • Divisadero Street Capital Management New · +27.9K
  • Weiss Asset Management New · +18.6K
  • D. E. Shaw & Co., Inc. Increased · +13.3K
  • Trexquant Investment New · +13.1K

Most significant sellers

By move score, not size.

  • Bridgewater Associates Sold Out · -3.2K
  • CITADEL ADVISORS LLC Sold Out · -14.9K
  • Walleye Capital Sold Out · -217
  • Aquatic Capital Management Sold Out · -2.3K
  • MARSHALL WACE, LLP Reduced · -7.4K

Hedge fund positions

Fund Tier Shares Previous Change Change % Portfolio wt. Action Score
Bridgewater Associates 1 0 3.2K -3.2K -100.0% 0.0% Sold Out 61
CITADEL ADVISORS LLC 1 0 14.9K -14.9K -100.0% 0.0% Sold Out 60
MILLENNIUM MANAGEMENT LLC 2 298.5K 43.6K +254.9K +584.4% 0.1% Increased 57
Divisadero Street Capital Management 2 27.9K 0 +27.9K — 0.1% New 57
Weiss Asset Management 2 18.6K 0 +18.6K — 0.1% New 56
D. E. Shaw & Co., Inc. 1 20.6K 7.3K +13.3K +182.8% 0.0% Increased 54
Trexquant Investment 3 13.1K 0 +13.1K — 0.0% New 53
Jain Global 3 1.9K 0 +1.9K — 0.0% New 52
Walleye Capital 3 0 217 -217 -100.0% 0.0% Sold Out 51
Boothbay Fund Management 4 7.0K 0 +7.0K — 0.0% New 51
Brevan Howard Capital Management 3 2.4K 0 +2.4K — 0.0% New 49
Aquatic Capital Management 4 0 2.3K -2.3K -100.0% 0.0% Sold Out 48
Engineers Gate 4 4.1K 0 +4.1K — 0.0% New 48
MARSHALL WACE, LLP 2 2.8K 10.2K -7.4K -72.5% 0.0% Reduced 45
Winton Group 4 7.4K 1.2K +6.2K +541.4% 0.1% Increased 45
Quantbot Technologies 4 2.1K 120 +2.0K +1625.0% 0.0% Increased 39
Balyasny Asset Management L.P. 2 5.6K 4.1K +1.5K +36.7% 0.0% Increased 35
Gotham Asset Management, LLC 2 2.7K 2.6K +9 +0.3% 0.0% Increased 23
AQR Capital Management 3 17.5K 19.1K -1.6K -8.2% 0.0% Reduced 22
Graham Capital Management 3 960 1.1K -127 -11.7% 0.0% Reduced 21
TWO SIGMA INVESTMENTS, LP 2 4.9K 4.9K 0 +0.0% 0.0% Unchanged 21

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.