TANDEM DIABETES CARE INC TNDM
COM NEW · Common Stock · CUSIP 875372203 · ISIN US8753722037
U.S. healthcare company
- SectorHealth care
- IndustrySurgical & Medical Instruments & Apparatus
- HeadquartersSan Diego, CA
- Founded2008
- Websitetandemdiabetes.com
- FilingsSEC EDGAR
* Summed across managers. Shares that two managers' reports both contain – a subsidiary's holdings that its parent's report includes too, or a sub-adviser's in its client's – are counted once ($3.3m this quarter). Holder counts are more reliable. Shares outstanding: 65.2m as of 2023-10-26, from the company's own SEC filing; the percentage can still exceed 100%: lent-out shares are counted by the lender and the buyer, and some reports overlap without saying so. Implied quarter-end price ≈ $20.77. Options: 11 managers hold calls ($7.0m notional), 12 hold puts ($8.0m).
Trends to Q3 2023
Institutional holders
Managers reporting a position, each quarter
Numbers
| Quarter | Holders |
|---|---|
| Q3 2022 | 298 |
| Q4 2022 | 295 |
| Q1 2023 | 275 |
| Q2 2023 | 248 |
| Q3 2023 | 226 |
Buyers vs sellers
Managers adding to or starting a position, vs cutting or selling out
Numbers
| Quarter | Bought or added | Cut or sold out |
|---|---|---|
| Q4 2022 | 150 | 149 |
| Q1 2023 | 150 | 144 |
| Q2 2023 | 125 | 151 |
| Q3 2023 | 104 | 135 |
Calls vs puts
Options held, notional value, last 4 quarters. P/C = puts ÷ calls
Numbers
| Quarter | Calls | Puts | P/C |
|---|---|---|---|
| Q4 2022 | $19.5m | $10.1m | 0.52 |
| Q1 2023 | $9.7m | $4.3m | 0.44 |
| Q2 2023 | $4.6m | $7.0m | 1.52 |
| Q3 2023 | $7.0m | $8.0m | 1.14 |
Biggest buyers
| EMINENCE CAPITAL, LP | Added | +2.4m |
| ArrowMark Colorado Holdings LLC | New | +1.6m |
| First Light Asset Management, LLC | Added | +840.2k |
| JENNISON ASSOCIATES LLC | Added | +804.5k |
| Chicago Capital, LLC | Added | +791.3k |
| JANUS HENDERSON GROUP PLC | Added | +586.8k |
| Capital International Investors | Added | +558.9k |
| CITADEL ADVISORS LLC | Added | +474.2k |
| MORGAN STANLEY | Added | +371.4k |
| Paradice Investment Management LLC | Added | +293.2k |
Biggest sellers
| FMR LLC | Reduced | -1.6m |
| MILLENNIUM MANAGEMENT LLC | Reduced | -543.5k |
| MARSHALL WACE, LLP | Reduced | -478.1k |
| Octagon Capital Advisors LP | Sold out | -474.9k |
| TWO SIGMA INVESTMENTS, LP | Reduced | -427.3k |
| BNP PARIBAS ASSET MANAGEMENT Holding S.A. | Sold out | -427.0k |
| NORGES BANK | Reduced | -404.1k |
| D. E. Shaw & Co., Inc. | Reduced | -351.1k |
| Eagle Health Investments LP | Sold out | -320.3k |
| Cubist Systematic Strategies, LLC | Reduced | -273.1k |
Biggest calls
| SUSQUEHANNA INTERNATIONAL GROUP, LLP | Added | $2.6m126.6k shares |
| MILLENNIUM MANAGEMENT LLC | Added | $1.7m80.0k shares |
| CITADEL ADVISORS LLC | Added | $1.0m49.2k shares |
| Cubist Systematic Strategies, LLC | Added | $787.2k37.9k shares |
| SIMPLEX TRADING, LLC | Reduced | $243.0k11.7k shares |
| JANE STREET GROUP, LLC | Added | $211.9k10.2k shares |
| Walleye Trading LLC | New | $157.9k7.6k shares |
| Walleye Capital LLC | Unchanged | $132.9k6.4k shares |
| BNP PARIBAS FINANCIAL MARKETS | Reduced | $89.3k43 shares |
| GROUP ONE TRADING LLC | Reduced | $76.8k3.7k shares |
Biggest puts
| SUSQUEHANNA INTERNATIONAL GROUP, LLP | Added | $3.1m150.9k shares |
| PURA VIDA INVESTMENTS, LLC | Reduced | $1.7m81.8k shares |
| CITADEL ADVISORS LLC | Added | $951.3k45.8k shares |
| D. E. Shaw & Co., Inc. | Reduced | $623.1k30.0k shares |
| Cubist Systematic Strategies, LLC | Added | $486.0k23.4k shares |
| WOLVERINE TRADING, LLC | New | $297.0k14.3k shares |
| SIMPLEX TRADING, LLC | Added | $218.0k10.5k shares |
| TWO SIGMA SECURITIES, LLC | New | $211.9k10.2k shares |
| Walleye Trading LLC | New | $178.6k8.6k shares |
| Walleye Capital LLC | Added | $124.6k6.0k shares |
Options at notional value: the value of the shares the contracts control, as filers report them, not what the options cost. Not included in the holders, shares or buying above.
Major shareholders (over 5%)
Anyone who owns more than 5% of a class of the company's shares has to say so: on Schedule 13D if they may try to influence or control the company, on 13G if they're a passive investor, and update it as the stake changes. Each holder's latest filing, from 19 Dec 2024 on; percentages are of the share class, as the holder worked them out.
| Holder | Stake |
|---|---|
| BlackRock, Inc. 13G · institution filed 2025-04-29 | 15.2% |
| Sessa Capital (Master), L.P. 13G · passive investor new · filed 2025-05-15 | 6.7% |
| VANGUARD PORTFOLIO MANAGEMENT LLC 13G · institution new · filed 2026-04-29 | 5.9% |
| VANGUARD CAPITAL MANAGEMENT LLC 13G · institution new · filed 2026-04-30 | 5.2% |
Fell to 5% or below in the last year: Voya Financial, Inc. (0.2%, 2026-08-06), VANGUARD GROUP INC (0.0%, 2026-03-27; now reported by VANGUARD PORTFOLIO MANAGEMENT LLC), ArrowMark Colorado Holdings LLC (4.3%, 2026-02-17)
Insider purchases and sales in Q3 2023
Shares bought or sold by the company's own officers, directors and 10% owners, in the open market or privately, as they reported to the SEC on Form 4 (due within two business days of the trade). Grants, option exercises, shares withheld for tax and gifts aren't included.
Officers and directors buying vs selling
Number of people, by quarter (10% owners not included)
Numbers
| Quarter | Buying | Bought | Selling | Sold | Sold under a plan |
|---|---|---|---|---|---|
| Q4 2021 | 0 | — | 6 | $18.8m | — |
| Q1 2022 | 0 | — | 3 | $992.3k | — |
| Q2 2022 | 3 | $511.0k | 4 | $1.9m | — |
| Q3 2022 | 0 | — | 0 | — | — |
| Q4 2022 | 0 | — | 1 | $1.0m | — |
| Q1 2023 | 0 | — | 1 | $411.9k | — |
| Q2 2023 | 3 | $484.0k | 0 | — | — |
| Q3 2023 | 1 | $21.4k | 0 | — | — |
| Date | Insider | Trade | Value |
|---|---|---|---|
| 2023-09-15 | McGroddy-Goetz Kathleen Director | Bought | $21.4k1.0k shares |
Their holding: how much the trade added to or took from the insider's holding (direct, or the trust or fund named). The same trade is sometimes reported by more than one insider, such as a fund and the director who represents it; totals count it once. A value is left blank where the reported price is far from the market price (usually a typo).
Holders, Q3 2023
| Manager | Shares | Change |
|---|---|---|
| BlackRock Inc. 0.01% of their portfolio | 8.9m $183.9m | Reduced -113.7k |
| VANGUARD GROUP INC 0.00% of their portfolio | 7.0m $145.5m | Reduced -9.6k |
| Capital World Investors 0.03% of their portfolio | 6.5m $135.9m | Added +59.3k |
| EMINENCE CAPITAL, LP 2.26% of their portfolio | 5.5m $114.0m | Added +2.4m |
| FMR LLC 0.01% of their portfolio | 3.0m $62.1m | Reduced -1.6m |
| JANUS HENDERSON GROUP PLC 0.04% of their portfolio | 2.7m $55.5m | Added +586.8k |
| STATE STREET CORP 0.00% of their portfolio | 2.2m $45.1m | Reduced -87.6k |
| Bellevue Group AG 0.72% of their portfolio | 2.1m $44.5m | Added +49.8k |
| Capital International Investors 0.01% of their portfolio | 1.8m $37.3m | Added +558.9k |
| ArrowMark Colorado Holdings LLC 0.41% of their portfolio | 1.6m $33.9m | New |
| Champlain Investment Partners, LLC 0.22% of their portfolio | 1.6m $33.6m | Reduced -2.8k |
| BROWN CAPITAL MANAGEMENT LLC 0.50% of their portfolio | 1.6m $32.5m | Reduced -27.2k |
| Paradice Investment Management LLC 2.71% of their portfolio | 1.5m $31.6m | Added +293.2k |
| First Light Asset Management, LLC 2.84% of their portfolio | 1.4m $29.9m | Added +840.2k |
| JENNISON ASSOCIATES LLC 0.02% of their portfolio | 1.1m $23.3m | Added +804.5k |
| VOLORIDGE INVESTMENT MANAGEMENT, LLC 0.11% of their portfolio | 1.0m $21.8m | Added +170.9k |
| TWO SIGMA ADVISERS, LP 0.05% of their portfolio | 1.0m $21.4m | Reduced -183.1k |
| GEODE CAPITAL MANAGEMENT, LLC 0.00% of their portfolio | 999.3k $20.8m | Added +26.0k |
| Stephens Investment Management Group LLC 0.34% of their portfolio | 989.1k $20.5m | Reduced -21.5k |
| Chicago Capital, LLC 0.88% of their portfolio | 904.4k $18.8m | Added +791.3k |
| JACOBS LEVY EQUITY MANAGEMENT, INC 0.10% of their portfolio | 793.5k $16.5m | Added +2.6k |
| TWO SIGMA INVESTMENTS, LP 0.05% of their portfolio | 780.5k $16.2m | Reduced -427.3k |
| MORGAN STANLEY 0.00% of their portfolio | 774.6k $16.1m | Added +371.4k |
| CITADEL ADVISORS LLC 0.01% of their portfolio | 645.4k $13.4m | Added +474.2k |
| Bank of New York Mellon Corp 0.00% of their portfolio | 514.7k $10.7m | Reduced -888 |
| MILLENNIUM MANAGEMENT LLC 0.01% of their portfolio | 503.9k $10.5m | Reduced -543.5k |
| NORTHERN TRUST CORP 0.00% of their portfolio | 376.9k $7.8m | Added +8.0k |
| CHARLES SCHWAB INVESTMENT MANAGEMENT INC 0.00% of their portfolio | 367.0k $7.6m | Added +16.6k |
| ALLIANCEBERNSTEIN L.P. 0.00% of their portfolio | 365.1k $7.6m | Added +191.3k |
| PRINCIPAL FINANCIAL GROUP INC 0.01% of their portfolio | 355.2k $7.4m | Reduced -18.7k |
| Coronation Fund Managers Ltd. 0.22% of their portfolio | 354.9k $7.4m | Added +147.1k |
| SUSQUEHANNA INTERNATIONAL GROUP, LLP 0.01% of their portfolio | 346.4k $7.2m | Added +36.6k |
| FRED ALGER MANAGEMENT, LLC 0.04% of their portfolio | 325.7k $6.8m | Added +110.0k |
| NEW YORK STATE COMMON RETIREMENT FUND 0.01% of their portfolio | 316.2k $6.6m | Reduced -18.8k |
| Invesco Ltd. 0.00% of their portfolio | 273.8k $5.7m | Reduced -22.5k |
| AMERIPRISE FINANCIAL INC 0.00% of their portfolio | 272.9k $5.7m | Reduced -12.1k |
| Invenomic Capital Management LP 0.24% of their portfolio | 272.4k $5.7m | Added +190.3k |
| BAILLIE GIFFORD & CO 0.00% of their portfolio | 262.8k $5.5m | Unchanged |
| SILVERCREST ASSET MANAGEMENT GROUP LLC 0.04% of their portfolio | 255.1k $5.3m | Added +63.4k |
| D. E. Shaw & Co., Inc. 0.01% of their portfolio | 250.9k $5.2m | Reduced -351.1k |
| PEREGRINE CAPITAL MANAGEMENT LLC 0.15% of their portfolio | 243.4k $5.1m | Added +52.9k |
| Alberta Investment Management Corp 0.05% of their portfolio | 241.6k $5.0m | Added +52.3k |
| DAFNA Capital Management LLC 1.43% of their portfolio | 220.7k $4.6m | Added +110.7k |
| TUDOR INVESTMENT CORP ET AL 0.07% of their portfolio | 215.4k $4.5m | Added +8.3k |
| Jump Financial, LLC 0.16% of their portfolio | 204.2k $4.2m | Added +41.1k |
| Legal & General Group Plc 0.00% of their portfolio | 182.7k $3.8m | Reduced -584 |
| MARSHALL WACE, LLP 0.01% of their portfolio | 179.0k $3.7m | Reduced -478.1k |
| RHUMBLINE ADVISERS 0.00% of their portfolio | 173.3k $3.6m | Reduced -2.1k |
| NORGES BANK 0.00% of their portfolio | 163.3k $3.4m | Reduced -404.1k |
| JPMORGAN CHASE & CO 0.00% of their portfolio | 159.4k $3.3m | Reduced -41.2k |
| Nuveen Asset Management, LLC 0.00% of their portfolio | 156.1k $3.2m | Reduced -29.3k |
| Mirae Asset Global Investments Co., Ltd. 0.01% of their portfolio | 154.3k $3.2m | Reduced -9.5k |
| Squarepoint Ops LLC 0.02% of their portfolio | 153.2k $3.2m | Reduced -16.7k |
| FRONTIER CAPITAL MANAGEMENT CO LLC 0.03% of their portfolio | 145.8k $3.0m | Reduced -1.5k |
| Swiss National Bank 0.00% of their portfolio | 142.0k $2.9m | Added +1.4k |
| Russell Investments Group, Ltd. 0.01% of their portfolio | 137.8k $2.9m | Added +36.4k |
| DIMENSIONAL FUND ADVISORS LP 0.00% of their portfolio | 135.0k $2.8m | Reduced -159.5k |
| Integral Health Asset Management, LLC 0.38% of their portfolio | 130.0k $2.7m | New |
| PRUDENTIAL FINANCIAL INC 0.00% of their portfolio | 129.7k $2.7m | Added +52.5k |
| KBC Group NV 0.01% of their portfolio | 129.3k $2.7m | Added +61.9k |
| Connor, Clark & Lunn Investment Management Ltd. 0.01% of their portfolio | 125.3k $2.6m | Reduced -133.7k |
| Skandinaviska Enskilda Banken AB (publ) 0.02% of their portfolio | 118.2k $2.5m | Unchanged |
| BANQUE PICTET & CIE SA 0.03% of their portfolio | 110.5k $2.3m | New |
| Cubist Systematic Strategies, LLC 0.03% of their portfolio | 108.1k $2.2m | Reduced -273.1k |
| RICE HALL JAMES & ASSOCIATES, LLC 0.14% of their portfolio | 107.4k $2.2m | New |
| Granahan Investment Management, LLC 0.07% of their portfolio | 98.9k $2.1m | Added +10.1k |
| VICTORY CAPITAL MANAGEMENT INC 0.00% of their portfolio | 98.7k $2.1m | Added +1.1k |
| UBS AM, a distinct business unit of UBS ASSET MANAGEMENT AMERICAS LLC 0.00% of their portfolio | 95.1k $2.0m | Added +3.2k |
| California Public Employees Retirement System 0.00% of their portfolio | 91.2k $1.9m | Unchanged |
| BANK OF AMERICA CORP /DE/ 0.00% of their portfolio | 90.2k $1.9m | Added +5.0k |
| State of New Jersey Common Pension Fund D 0.01% of their portfolio | 87.6k $1.8m | Reduced -4.6k |
| CREDIT SUISSE AG/ 0.00% of their portfolio | 85.7k $1.8m | Reduced -2.5k |
| STATE OF WISCONSIN INVESTMENT BOARD 0.01% of their portfolio | 84.6k $1.8m | Reduced -3.0k |
| BARCLAYS PLC 0.00% of their portfolio | 84.1k $1.7m | Added +18.0k |
| GOLDMAN SACHS GROUP INC 0.00% of their portfolio | 80.8k $1.7m | Reduced -3.0k |
| Public Sector Pension Investment Board 0.01% of their portfolio | 80.4k $1.7m | Reduced -34.3k |
| CANADA LIFE ASSURANCE Co 0.00% of their portfolio | 79.4k $1.6m | Added +690 |
| Bridgewater Associates, LP 0.01% of their portfolio | 77.6k $1.6m | Added +8.0k |
| CALIFORNIA STATE TEACHERS RETIREMENT SYSTEM 0.00% of their portfolio | 71.4k $1.5m | Reduced -7.0k |
| NEW YORK STATE TEACHERS RETIREMENT SYSTEM 0.00% of their portfolio | 70.0k $1.5m | Unchanged |
| STATE BOARD OF ADMINISTRATION OF FLORIDA RETIREMENT SYSTEM 0.00% of their portfolio | 65.5k $1.4m | Added +100 |
| Trexquant Investment LP 0.03% of their portfolio | 62.3k $1.3m | New |
| ExodusPoint Capital Management, LP 0.02% of their portfolio | 62.1k $1.3m | Reduced -73.2k |
| Thrivent Financial for Lutherans 0.00% of their portfolio | 59.5k $1.2m | Reduced -2.3k |
| DARK FOREST CAPITAL MANAGEMENT LP 0.10% of their portfolio | 58.7k $1.2m | Added +41.8k |
| MACQUARIE GROUP LTD 0.00% of their portfolio | 58.0k $1.2m | Added +16.1k |
| WELLS FARGO & COMPANY/MN 0.00% of their portfolio | 57.3k $1.2m | Reduced -13.6k |
| CAPITAL INTERNATIONAL LTD /CA/ 0.07% of their portfolio | 57.0k $1.2m | Reduced -1.0k |
| AXA S.A. 0.00% of their portfolio | 56.2k $1.2m | Reduced -185.6k |
| TEXAS PERMANENT SCHOOL FUND CORP 0.01% of their portfolio | 55.0k $1.1m | Reduced -1.7k |
| Millrace Asset Group, Inc. 1.40% of their portfolio | 54.7k $1.1m | New |
| CAPITAL INTERNATIONAL SARL 0.05% of their portfolio | 53.1k $1.1m | Added +4.9k |
| JANE STREET GROUP, LLC 0.00% of their portfolio | 46.7k $970.1k | Added +6.0k |
| COMMONWEALTH OF PENNSYLVANIA PUBLIC SCHOOL EMPLS RETRMT SYS 0.01% of their portfolio | 43.5k $903.7k | Reduced -29.5k |
| ALGERT GLOBAL LLC 0.04% of their portfolio | 42.6k $885.7k | Added +9.3k |
| BEACON INVESTMENT ADVISORY SERVICES, INC. 0.04% of their portfolio | 42.0k $871.5k | Reduced -779 |
| SEI INVESTMENTS CO 0.00% of their portfolio | 40.9k $849.6k | Added +20.3k |
| FORMULA GROWTH LTD 0.29% of their portfolio | 40.7k $846.3k | Added +17.0k |
| State of Alaska, Department of Revenue 0.01% of their portfolio | 40.5k $841.0k | Reduced -2.0k |
| RAYMOND JAMES & ASSOCIATES 0.00% of their portfolio | 40.3k $836.3k | Added +737 |