InvestorLens

TNDM — TANDEM DIABETES CARE INC

Public company

Sign in to save4 tracked investors reported this
For educational research only.InvestorLens analyzes public regulatory filings (SEC EDGAR, STOCK Act PTRs) that may be delayed by 45 days or more. Information shown is historical and is not financial, legal, or tax advice, nor a recommendation or solicitation to buy or sell any security. Always do your own research.

InvestorLens aggregates public filing data to show which tracked investors reported holdings in this stock. Dollar values represent reported position values, not market capitalization, and may be delayed up to 45 days. Not a recommendation.

Sourced from SEC EDGAR public filings

Why are billionaires buying TNDM?

Built from public SEC filings and public economic data. Not a recommendation.

Confidence
95
Institutional Conviction
Strong distribution · 0 buying vs 1 selling last quarter
8
Macro Tailwind
Macro conditions are mixed for this sector
57
Why? — Evidence & Confidence ▾

Of 1 tracked investors who changed their TNDM position last quarter, 0 bought and 1 sold (0% buy-side). Macro conditions are mixed for this sector (Macro Tailwind 57/100 in a Contraction regime).

Supporting evidence
  • +4 tracked investors reported holding TNDM at their latest filing
  • +Macro Health is 57/100 in a Contraction regime — historically acceptable for this sectorsource
Contradicting evidence — always shown
  • −1 tracked investor reduced or exited last quarter (0 reduced, 1 sold out)
  • −13F data is disclosed up to 45 days after quarter end — positions may have changed since
Know the limits
  • · 13F disclosure lag (up to 45 days)
  • · Tracked investors are a sample, not the whole market
  • · Sector regime fit is a historical average, not a guarantee

Every InvestorLens score shows its evidence — including what argues against it. Model conviction-v1 · generated 9/6/2026.

About TANDEM DIABETES CARE INC (TNDM)

TANDEM DIABETES CARE INC (TNDM) appears in the most recent 13F filings of 4 tracked institutional investors. The largest disclosed position is held by Ken Griffin (Citadel Advisors), valued at $79M. Across recent filings, tracked investors recorded 4 new positions, 1 increased, 5 reduced, and 4 exited. All data sourced from SEC 13F filings.

Smart Money Consensus™

Based on recent institutional activity in TNDM

36
/100
Institutional Distribution
Added / Increased5
Reduced5
Exited4
BearishBullish
Crowded Trade Score™

How many top investors track TNDM

27
/100
Emerging Interest
4investors

A small number of top investors own this.

UndiscoveredCrowded
151015+

TNDM Ownership Composition

How TANDEM DIABETES CARE INC is held across tracked investor types, based on reported 13F positions.

Dominant Type
Multi-Strategy / Quant
92% of tracked value
Institutions
4
tracked investors
Total Reported
$67M
combined 13F value
Types2
  • Multi-Strategy / Quant91.8%
  • Macro8.2%
Multi-Strategy / Quant(3)
91.8%
Macro(1)
8.2%

Tracked investors currently reporting TNDM

2 tracked investors have since exited this position — listed separately below.

  • Ken GriffinJun 30, 2026
    Citadel Advisors
    Shares
    1.9M
    Value
    $28M
    % Portfolio
    0.00%
  • Izzy EnglanderJun 30, 2026
    Millennium Management
    Shares
    1.3M
    Value
    $19.8M
    % Portfolio
    0.01%
  • Steve CohenJun 30, 2026
    Point72 Asset Management
    Shares
    910.9K
    Value
    $13.7M
    % Portfolio
    0.02%
  • Paul Tudor JonesJun 30, 2026
    Tudor Investment Corp
    Shares
    362.7K
    Value
    $5.5M
    % Portfolio
    0.01%

Previously held TNDM

These investors reported TNDM in an earlier quarter but not in their most recent 13F. Figures below are their last reported position, not a current holding.

InvestorFirmLast reported sharesValue thenLast held
Howard MarksOaktree Capital Management6.4M$6.1MMar 31, 2025
Ray DalioBridgewater Associates7.4K$265.8KDec 31, 2024

Recent activity

Frequently asked questions

How many institutional investors hold TNDM?
4 tracked institutional investors disclosed a position in TNDM (TANDEM DIABETES CARE INC) in their most recent 13F filing.
Who is the largest institutional holder of TNDM?
Ken Griffin, Citadel Advisors, holds the largest disclosed position in TNDM, valued at $79M.
Did institutional ownership of TNDM increase or decrease?
Across recent 13F filings, tracked investors recorded 4 new positions, 1 increased, 5 reduced, and 4 fully exited TNDM.
Where does this TNDM ownership data come from?
SEC Form 13F-HR filings, accessed via EDGAR. 13F filings are disclosed quarterly with a 45-day reporting delay and cover U.S.-listed long equity positions only. This is not investment advice.