TNDM Tandem Diabetes Care, Inc.

NASDAQ
$16.81

Tandem Diabetes Care, Inc. (TNDM) 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
+40.74
19 buyers / 8 sellers
STRONG BUYING
Funds compared
27
funds with comparable TNDM positions
25 current holders · 20 prior-quarter holders
Net share change
+987.9K
+4.93M added, -3.94M cut
Position activity
7 new 12 increased 6 reduced 2 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
MARSHALL WACE, LLP Long/Short Sold Out -1.44M -100.0% $21.8M 0.0% 60
RENAISSANCE TECHNOLOGIES LLC Quant Sold Out -58.2K -100.0% $878.6K 0.0% 58
Woodline Partners LP Long/Short New +1.31M — $19.7M 0.1% 58
Squarepoint Ops LLC Quant New +217.4K — $3.3M 0.0% 57
Schonfeld Strategic Advisors Long/Short Quant New +129.6K — $2.0M 0.0% 53
Quadrature Capital Quant New +10.9K — $164.5K 0.0% 52
Man Group Event Long/Short New +51.0K — $769.2K 0.0% 52
Qube Research & Technologies Ltd Quant Increased +631.9K +1216.0% $9.5M 0.0% 51
Verition Fund Management Event Long/Short Increased +592.9K +553.5% $8.9M 0.1% 50
Caption Management Quant New +6.2K — $93.6K 0.0% 50

Most significant buyers

By move score, not size.

  • Woodline Partners LP New · +1.31M
  • Squarepoint Ops LLC New · +217.4K
  • Schonfeld Strategic Advisors New · +129.6K
  • Quadrature Capital New · +10.9K
  • Man Group New · +51.0K

Most significant sellers

By move score, not size.

  • MARSHALL WACE, LLP Sold Out · -1.44M
  • RENAISSANCE TECHNOLOGIES LLC Sold Out · -58.2K
  • TWO SIGMA INVESTMENTS, LP Reduced · -1.31M
  • Trexquant Investment Reduced · -159.2K
  • Holocene Advisors, LP Reduced · -209.5K

Hedge fund positions

Fund Tier Shares Previous Change Change % Portfolio wt. Action Score
MARSHALL WACE, LLP 2 0 1.4M -1.44M -100.0% 0.0% Sold Out 60
RENAISSANCE TECHNOLOGIES LLC 1 0 58.2K -58.2K -100.0% 0.0% Sold Out 58
Woodline Partners LP 2 1.3M 0 +1.31M — 0.1% New 58
Squarepoint Ops LLC 2 217.4K 0 +217.4K — 0.0% New 57
Schonfeld Strategic Advisors 3 129.6K 0 +129.6K — 0.0% New 53
Quadrature Capital 3 10.9K 0 +10.9K — 0.0% New 52
Man Group 3 51.0K 0 +51.0K — 0.0% New 52
Qube Research & Technologies Ltd 2 683.8K 52.0K +631.9K +1216.0% 0.0% Increased 51
Verition Fund Management 2 700.0K 107.1K +592.9K +553.5% 0.1% Increased 50
Caption Management 3 6.2K 0 +6.2K — 0.0% New 50
Tudor Investment Corporation 2 362.7K 79.0K +283.7K +359.1% 0.0% Increased 50
Engineers Gate 4 64.7K 0 +64.7K — 0.0% New 48
TWO SIGMA INVESTMENTS, LP 2 558.4K 1.9M -1.31M -70.0% 0.0% Reduced 47
MILLENNIUM MANAGEMENT LLC 2 1.3M 761.7K +550.1K +72.2% 0.0% Increased 46
Y-Intercept 4 314.7K 77.9K +236.8K +304.0% 0.1% Increased 45
Point72 Asset Management, L.P. 1 610.9K 420.5K +190.4K +45.3% 0.0% Increased 42
Sessa Capital 2 5.1M 4.7M +369.2K +7.8% 1.4% Increased 39
Trexquant Investment 3 90.1K 249.3K -159.2K -63.9% 0.0% Reduced 38
Holocene Advisors, LP 2 267.9K 477.4K -209.5K -43.9% 0.0% Reduced 38
Soleus Capital Management 2 575.0K 783.0K -208.0K -26.6% 0.3% Reduced 37
AQR Capital Management 3 533.8K 331.9K +201.9K +60.8% 0.0% Increased 37
CITADEL ADVISORS LLC 1 1.7M 2.2M -456.8K -20.8% 0.0% Reduced 34
D. E. Shaw & Co., Inc. 1 681.8K 783.9K -102.1K -13.0% 0.0% Reduced 32
Quantbot Technologies 4 3.7K 2.3K +1.4K +60.3% 0.0% Increased 29
Cinctive Capital Management 3 86.9K 63.8K +23.1K +36.2% 0.1% Increased 28
ExodusPoint Capital Management 3 691.8K 632.9K +58.9K +9.3% 0.1% Increased 24
Brevan Howard Capital Management 3 41.0K 38.3K +2.7K +7.0% 0.0% Increased 20

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.