Tandem Diabetes Care

TNDM • NASDAQ

Tandem Diabetes Care is a medical - devices company in the healthcare sector on NASDAQ, led by John F. Sheridan, with a market cap of $1.5B. As of Q3 2025, 111% of shares are held by 249 institutional investors, with BlackRock, Inc. as the largest holder at 17.91%.

President and Chief Executive OfficerJohn F. Sheridan

Market Cap$1.5B

Medical - Devices

Healthcare

Employees2.4K

Websitetandemdiabetes.com

Country

United States of America

Overview

Overview of institutional ownership in TNDM as of Q3 2025 with a market cap of $820.3M

All Institutions

Institutions: 249
Value Held: $908.7M
Shares Held: 74.9M
Avg Position: $3.6M
Median Position: $318.1K

Hedge Funds

Hedge Funds: 35
Value Held: $230.2M
Shares Held: 19.0M
Avg Position: $6.6M
Median Position: $2.1M

Ownership Breakdown

Institutional (non-HF)

82.71%

$678.5M

Hedge Funds

28.06%

$230.2M

Retail & Other

Based on market cap of $820.3M as of Q3 2025. Institutional (non-HF) excludes hedge funds to avoid double counting.

Biggest Investors

Institutions with the largest positions in TNDM as of Q3 2025

Institution	Key People	Position Value	Ownership	Owned Since	Total AUM (Long)
B BlackRock, Inc. Institution	-	$146.9M 0.00% of portfolio	17.91% 12.1M shares	Q1 2016 Held for 9y 8m	$5.67T
VANGUARD GROUP INC Institution	Salim Ramji CEO	$85.7M 0.00% of portfolio	10.45% 7.1M shares	Q4 2013 Held for 11y 11m	$6.69T
Sessa Capital IM, L.P. Hedge Fund•Long/Short	Jae Hong President	$60.7M 1.54% of portfolio	7.40% 5.0M shares	Q1 2025 Held for 8 months	$3.9B
A Arrowpoint Asset Management, LLC Hedge Fund•Multi-Strategy	David John Corkins Managing Partner	$44.8M 0.83% of portfolio	5.46% 3.7M shares	Q3 2023 Held for 2y 2m	$5.4B
GANNETT WELSH & KOTLER Long Only Manager	Thomas F X Powers CEO	$33.0M 0.29% of portfolio	4.03% 2.7M shares	Q4 2023 Held for 1y 11m	$11.2B
STATE STREET CORP Institution	Ronald P. O'Hanley CEO	$32.4M 0.00% of portfolio	3.95% 2.7M shares	Q1 2018 Held for 7y 8m	$2.88T
Hood River Capital Management LLC Long Only Manager	Brian Paul Smoluch Managing Partner	$31.0M 0.37% of portfolio	3.78% 2.6M shares	Q4 2024 Held for 11 months	$8.5B
Paradice Investment Management LLC Long Only Manager	Kevin Paul Beck President	$26.7M 5.98% of portfolio	3.25% 2.2M shares	Q2 2023 Held for 2y 5m	$445.9M
F Freestone Grove Partners LP Hedge Fund•Multi-Strategy	Todd Keefe Barker CEO	$22.7M 0.17% of portfolio	2.77% 1.9M shares	Q3 2025 Held for 2 months	$13.5B
GEODE CAPITAL MANAGEMENT LLC ETF Provider	David Kenneth Lane CEO	$19.4M 0.00% of portfolio	2.37% 1.6M shares	Q4 2013 Held for 11y 11m	$1.57T

Net Capital Flow

Institutional buying and selling activity for TNDM in Q3 2025

Traded: −$139.8M
Buyers: 120
Sellers: 148
Total Bought: +$137.0M
Total Sold: −$276.8M
Avg Position: $3.0M

Biggest Buyers

Institution	Net Bought	Current Position
F Freestone Grove Partners LP Hedge Fund•Multi-Strategy	+$22.7M +1.9M shares	$22.7M 1.9M shares
B BlackRock, Inc. Institution	+$14.9M +1.2M shares	$146.9M 12.1M shares
A Arrowpoint Asset Management, LLC Hedge Fund•Multi-Strategy	+$12.0M +991.6K shares	$44.8M 3.7M shares
BARCLAYS PLC Institution	+$7.6M +623.1K shares	$14.4M 1.2M shares
ACADIAN ASSET MANAGEMENT LLC Long Only Manager	+$6.8M +560.2K shares	$11.2M 918.7K shares
D D. E. Shaw & Co., Inc. Institution	+$6.5M +538.5K shares	$10.6M 877.2K shares
R ROYCE & ASSOCIATES LLC Institution	+$6.2M +510.0K shares	$6.2M 510.0K shares
C Cubist Systematic Strategies, LLC Institution	+$5.3M +439.2K shares	$5.3M 439.2K shares
Paradice Investment Management LLC Long Only Manager	+$5.2M +429.3K shares	$26.7M 2.2M shares
AQR CAPITAL MANAGEMENT LLC Hedge Fund•Multi-Strategy	+$4.4M +374.1K shares	$4.9M 415.1K shares

Biggest Sellers

Institution	Net Sold	Current Position
Stephens Investment Management Group LLC Long Only Manager	−$32.4M −1.7M shares	Sold Off 0 shares
C Champlain Investment Partners, LLC Long Only Manager	−$27.1M −1.5M shares	Sold Off 0 shares
O Ophir Asset Management Pty Ltd Long Only Manager	−$24.4M −1.5M shares	Sold Off 0 shares
B BROWN ADVISORY INC RIA/Wealth	−$19.7M −1.1M shares	Sold Off 0 shares
C Capital World Investors Institution	−$14.3M −767.0K shares	Sold Off 0 shares
F FRED ALGER MANAGEMENT INC Long Only Manager	−$12.4M −667.3K shares	Sold Off 0 shares
ExodusPoint Capital Management, LP Hedge Fund•Multi-Strategy	−$7.8M −417.3K shares	Sold Off 0 shares
SILVERCREST ASSET MANAGEMENT GROUP LLC RIA/Wealth	−$6.5M −346.2K shares	Sold Off 0 shares
MORGAN STANLEY RIA/Wealth	−$6.4M −528.0K shares	$9.0M 737.5K shares
TUDOR INVESTMENT CORP ET AL Hedge Fund•Multi-Strategy	−$5.8M −311.5K shares	Sold Off 0 shares

Entry and Exit Activity

Institutions that initiated new positions or completely exited TNDM in Q3 2025

New Positions: 13
New Value: $4.5M
Exited Positions: 57
Exited Value: $202.4M

New Positions

Institution	Position Value
K Kent Lake PR LLC Hedge Fund•Long/Short	$3.0M 250.0K shares
B Bryce Point Capital, LLC Hedge Fund•Market Neutral	$513.0K 42.3K shares
Q Quadrature Capital Ltd Institution	$325.1K 26.8K shares
P PharVision Advisers, LLC Hedge Fund•Long/Short	$270.3K 22.3K shares
WEALTH ENHANCEMENT ADVISORY SERVICES, LLC RIA/Wealth	$219.0K 15.1K shares
C China Universal Asset Management Co., Ltd. Institution	$97.1K 8.0K shares
Point72 Europe LLP Digital Asset Manager	$19.1K 1.6K shares
FIRST HORIZON NATIONAL CORP RIA/Wealth	$14.5K 1.2K shares
S Salomon & Ludwin, LLC Institution	$8.9K 604.0 shares
O Optiver Holding B.V. Institution	$5.6K 460.0 shares

Exited Positions

Institution	Previous Position
Stephens Investment Management Group LLC Long Only Manager	$32.4M 1.7M shares
C Champlain Investment Partners, LLC Long Only Manager	$27.1M 1.5M shares
O Ophir Asset Management Pty Ltd Long Only Manager	$24.4M 1.5M shares
B BROWN ADVISORY INC RIA/Wealth	$19.7M 1.1M shares
C Capital World Investors Institution	$14.3M 767.0K shares
F FRED ALGER MANAGEMENT INC Long Only Manager	$12.4M 667.3K shares
ExodusPoint Capital Management, LP Hedge Fund•Multi-Strategy	$7.8M 417.3K shares
SILVERCREST ASSET MANAGEMENT GROUP LLC RIA/Wealth	$6.5M 346.2K shares
TUDOR INVESTMENT CORP ET AL Hedge Fund•Multi-Strategy	$5.8M 311.5K shares
AH Lisanti Capital Growth, LLC Long Only Manager	$4.7M 253.8K shares

Options Activity

Institutions with the largest Call and Put options positions in TNDM as of Q3 2025

Call Positions: 8
Call Value: $35.8M
Put Positions: 9
Put Value: $4.6M

Call Positions

Institution	Position Value
UBS Group AG Institution	$33.3M 27.5K contracts
Walleye Trading Advisors, LLC Hedge Fund•Multi-Strategy	$840.1K 692.0 contracts
CITADEL ADVISORS LLC Hedge Fund•Multi-Strategy	$546.3K 450.0 contracts
W WOLVERINE TRADING, LLC Institution	$439.8K 373.0 contracts
SUSQUEHANNA INTERNATIONAL GROUP, LLP Private Equity	$298.6K 246.0 contracts
Walleye Trading LLC RIA/Wealth	$199.1K 164.0 contracts
TUDOR INVESTMENT CORP ET AL Hedge Fund•Multi-Strategy	$168.7K 139.0 contracts
J JANE STREET GROUP, LLC Institution	- - contracts

Put Positions

Institution	Position Value
SUSQUEHANNA INTERNATIONAL GROUP, LLP Private Equity	$1.4M 1.2K contracts
D D. E. Shaw & Co., Inc. Institution	$849.8K 700.0 contracts
CITADEL ADVISORS LLC Hedge Fund•Multi-Strategy	$654.3K 539.0 contracts
J JANE STREET GROUP, LLC Institution	$542.7K 447.0 contracts
Walleye Trading Advisors, LLC Hedge Fund•Multi-Strategy	$537.8K 443.0 contracts
Walleye Trading LLC RIA/Wealth	$251.3K 207.0 contracts
TUDOR INVESTMENT CORP ET AL Hedge Fund•Multi-Strategy	$166.3K 137.0 contracts
W WOLVERINE TRADING, LLC Institution	$154.4K 131.0 contracts
NBC SECURITIES, INC. RIA/Wealth	$1.1K 0.1 contracts

Most Committed Institutions

Institutions with TNDM as the highest % of their portfolio as of Q3 2025

Institution	Key People	Portfolio Weight	Ownership	Owned Since	Total AUM (Long)
Paradice Investment Management LLC Long Only Manager	Kevin Paul Beck President	5.98% $26.7M	3.25% 2.2M shares	Q2 2023 Held for 2y 5m	$445.9M
K Kent Lake PR LLC Hedge Fund•Long/Short	Benjamin Natter Managing Partner	1.55% $3.0M	0.37% 250.0K shares	Q3 2025 Held for 2 months	$195.5M
Sessa Capital IM, L.P. Hedge Fund•Long/Short	Jae Hong President	1.54% $60.7M	7.40% 5.0M shares	Q1 2025 Held for 8 months	$3.9B
D DAFNA Capital Management LLC Hedge Fund•Event Driven	Nathan Fischel CEO	1.08% $4.3M	0.53% 355.2K shares	Q2 2023 Held for 2y 5m	$397.7M
A Arrowpoint Asset Management, LLC Hedge Fund•Multi-Strategy	David John Corkins Managing Partner	0.83% $44.8M	5.46% 3.7M shares	Q3 2023 Held for 2y 2m	$5.4B
S SECTOR GAMMA AS Institution	-	0.81% $3.3M	0.40% 269.5K shares	Q1 2025 Held for 8 months	$403.3M
B Bryce Point Capital, LLC Hedge Fund•Market Neutral	Gil Maor Managing Partner	0.63% $513.0K	0.06% 42.3K shares	Q3 2025 Held for 2 months	$81.9M
FORMULA GROWTH LTD Hedge Fund•Long/Short	Randall William Kelly President	0.51% $1.5M	0.18% 122.1K shares	Q1 2020 Held for 5y 8m	$288.3M
Hood River Capital Management LLC Long Only Manager	Brian Paul Smoluch Managing Partner	0.37% $31.0M	3.78% 2.6M shares	Q4 2024 Held for 11 months	$8.5B
GANNETT WELSH & KOTLER Long Only Manager	Thomas F X Powers CEO	0.29% $33.0M	4.03% 2.7M shares	Q4 2023 Held for 1y 11m	$11.2B

Hedge Fund Spotlight

Discover hedge funds investing in TNDM

Quantbot Technologies LLC

Hedge Fund • Quant

Portfolio ManagerPaul Edward White

Portfolio Value: $3.7B
Positions: 1,694
Last Reported: Q3 2025

Sector Allocation

Position in Tandem Diabetes Care

Market Value: $407.1K
Shares Held: 33.5K
Portfolio Weight: 0.01%
Owned Since: 2025-Q2

Top Holding	Sector	Market Value	Weight
1 SoFi Technologies, Inc. SOFI	Financial - Credit Services Financial Services	$29.1M	0.79%
2 Lam Research LRCX	Semiconductors Technology	$27.8M	0.75%
3 Honeywell International HON	Conglomerates Industrials	$27.6M	0.75%