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 ($10.5m this quarter). Holder counts are more reliable. Shares outstanding: 64.3m as of 2022-10-28, 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 ≈ $44.91. Options: 17 managers hold calls ($19.5m notional), 13 hold puts ($10.1m).
Trends to Q4 2022
Institutional holders
Managers reporting a position, each quarter
Numbers
| Quarter | Holders |
|---|---|
| Q3 2022 | 298 |
| Q4 2022 | 295 |
Calls vs puts
Options held, notional value, last 4 quarters. P/C = puts ÷ calls
Numbers
| Quarter | Calls | Puts | P/C |
|---|---|---|---|
| Q3 2022 | $24.0m | $20.7m | 0.86 |
| Q4 2022 | $19.5m | $10.1m | 0.52 |
Biggest buyers
| Capital International Investors | New | +1.2m |
| EMINENCE CAPITAL, LP | Added | +1.2m |
| MARSHALL WACE, LLP | New | +881.3k |
| FMR LLC | Added | +668.8k |
| MILLENNIUM MANAGEMENT LLC | Added | +540.3k |
| Eagle Health Investments LP | Added | +394.1k |
| BNP PARIBAS ASSET MANAGEMENT Holding S.A. | New | +367.5k |
| Capital World Investors | Added | +294.6k |
| Balyasny Asset Management L.P. | Added | +287.4k |
| Point72 Asset Management, L.P. | Added | +276.9k |
Biggest sellers
| Invesco Ltd. | Reduced | -1.1m |
| FEDERATED HERMES, INC. | Reduced | -653.1k |
| TimesSquare Capital Management, LLC | Sold out | -546.5k |
| EAGLE ASSET MANAGEMENT INC | Sold out | -520.8k |
| JANUS HENDERSON GROUP PLC | Reduced | -451.7k |
| WESTFIELD CAPITAL MANAGEMENT CO LP | Sold out | -421.7k |
| AXA S.A. | Reduced | -394.6k |
| WELLINGTON MANAGEMENT GROUP LLP | Sold out | -328.9k |
| RTW INVESTMENTS, LP | Sold out | -322.0k |
| Squarepoint Ops LLC | Reduced | -299.4k |
Biggest calls
| CITADEL ADVISORS LLC | Added | $6.9m154.4k shares |
| Balyasny Asset Management L.P. | New | $2.9m65.0k shares |
| Walleye Trading LLC | Reduced | $2.1m46.3k shares |
| SUSQUEHANNA INTERNATIONAL GROUP, LLP | Reduced | $1.4m30.9k shares |
| JANE STREET GROUP, LLC | Reduced | $1.1m25.2k shares |
| Squarepoint Ops LLC | New | $1.1m24.9k shares |
| GROUP ONE TRADING LLC | Added | $970.9k21.6k shares |
| D. E. Shaw & Co., Inc. | Unchanged | $750.7k16.7k shares |
| WOLVERINE TRADING, LLC | Reduced | $607.0k13.5k shares |
| CAPITAL FUND MANAGEMENT S.A. | New | $503.4k11.2k shares |
Biggest puts
| CITADEL ADVISORS LLC | Reduced | $3.6m80.7k shares |
| D. E. Shaw & Co., Inc. | New | $1.8m40.0k shares |
| JANE STREET GROUP, LLC | Added | $1.3m29.9k shares |
| Cubist Systematic Strategies, LLC | Reduced | $1.3m29.4k shares |
| SIMPLEX TRADING, LLC | Added | $557.0k12.4k shares |
| WOLVERINE TRADING, LLC | Reduced | $472.0k10.5k shares |
| Parallax Volatility Advisers, L.P. | Unchanged | $449.5k10.0k shares |
| PEAK6 Investments LLC | Reduced | $224.8k5.0k shares |
| Walleye Trading LLC | Added | $161.8k3.6k shares |
| WOLVERINE ASSET MANAGEMENT LLC | Unchanged | $98.9k2.2k 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 Q4 2022
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 |
|---|---|---|---|---|---|
| Q1 2021 | 0 | — | 0 | — | — |
| Q2 2021 | 0 | — | 0 | — | — |
| Q3 2021 | 0 | — | 0 | — | — |
| 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 | — |
| Date | Insider | Trade | Value |
|---|---|---|---|
| 2022-12-16 | BERGER DAVID B EVP & Chief Operating Officer | Sold | $402.5k10.0k shares |
| 2022-12-15 | BERGER DAVID B EVP & Chief Operating Officer | Sold | $604.8k15.0k 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, Q4 2022
| Manager | Shares | Change |
|---|---|---|
| FMR LLC 0.04% of their portfolio | 9.6m $433.4m | Added +668.8k |
| BlackRock Inc. 0.01% of their portfolio | 6.3m $285.3m | Added +253.2k |
| VANGUARD GROUP INC 0.01% of their portfolio | 6.1m $275.4m | Reduced -67.0k |
| Capital World Investors 0.05% of their portfolio | 4.9m $218.0m | Added +294.6k |
| Champlain Investment Partners, LLC 0.88% of their portfolio | 3.1m $137.9m | Reduced -55.1k |
| EMINENCE CAPITAL, LP 2.32% of their portfolio | 2.8m $125.1m | Added +1.2m |
| BROWN CAPITAL MANAGEMENT LLC 1.50% of their portfolio | 2.0m $90.6m | Added +5.2k |
| STATE STREET CORP 0.00% of their portfolio | 1.8m $82.1m | Added +44.3k |
| Bellevue Group AG 1.07% of their portfolio | 1.8m $80.5m | Added +225.4k |
| Capital International Investors 0.01% of their portfolio | 1.2m $55.5m | New |
| Stephens Investment Management Group LLC 0.77% of their portfolio | 983.2k $42.3m | Added +3.6k |
| TWO SIGMA ADVISERS, LP 0.12% of their portfolio | 961.1k $43.2m | Added +260.2k |
| GEODE CAPITAL MANAGEMENT, LLC 0.01% of their portfolio | 914.4k $41.1m | Added +48.4k |
| MARSHALL WACE, LLP 0.10% of their portfolio | 881.3k $39.6m | New |
| TWO SIGMA INVESTMENTS, LP 0.13% of their portfolio | 879.7k $39.5m | Added +214.9k |
| Bank of New York Mellon Corp 0.01% of their portfolio | 639.7k $28.8m | Reduced -14.1k |
| NORGES BANK 0.01% of their portfolio | 632.9k $28.5m | Added +24.7k |
| MILLENNIUM MANAGEMENT LLC 0.03% of their portfolio | 613.3k $27.6m | Added +540.3k |
| NORTHERN TRUST CORP 0.01% of their portfolio | 596.4k $26.8m | Reduced -7.6k |
| Eagle Health Investments LP 6.12% of their portfolio | 590.5k $26.5m | Added +394.1k |
| First Light Asset Management, LLC 2.45% of their portfolio | 586.1k $26.3m | Added +100.5k |
| Balyasny Asset Management L.P. 0.09% of their portfolio | 580.9k $26.1m | Added +287.4k |
| AXA S.A. 0.09% of their portfolio | 579.3k $26.0m | Reduced -394.6k |
| Nuveen Asset Management, LLC 0.01% of their portfolio | 537.0k $24.1m | Added +59.3k |
| MORGAN STANLEY 0.00% of their portfolio | 475.6k $21.4m | Added +151.0k |
| Octagon Capital Advisors LP 3.32% of their portfolio | 474.9k $21.3m | Unchanged |
| JANUS HENDERSON GROUP PLC 0.01% of their portfolio | 465.7k $20.9m | Reduced -451.7k |
| NEW YORK STATE COMMON RETIREMENT FUND 0.02% of their portfolio | 376.1k $16.9m | Added +37.0k |
| BNP PARIBAS ASSET MANAGEMENT Holding S.A. 0.06% of their portfolio | 367.5k $16.5m | New |
| Point72 Asset Management, L.P. 0.06% of their portfolio | 359.6k $16.2m | Added +276.9k |
| CHARLES SCHWAB INVESTMENT MANAGEMENT INC 0.00% of their portfolio | 342.5k $15.4m | Added +8.6k |
| GOLDMAN SACHS GROUP INC 0.00% of their portfolio | 341.7k $15.4m | Added +51.1k |
| MACQUARIE GROUP LTD 0.02% of their portfolio | 328.7k $14.8m | Reduced -116.5k |
| Chicago Capital, LLC 0.82% of their portfolio | 328.2k $14.8m | Reduced -151.7k |
| Granite Investment Partners, LLC 0.60% of their portfolio | 319.5k $14.4m | Reduced -26.7k |
| Soleus Capital Management, L.P. 2.02% of their portfolio | 312.5k $14.0m | Reduced -102.7k |
| PRICE T ROWE ASSOCIATES INC /MD/ 0.00% of their portfolio | 290.3k $13.0m | Reduced -113.7k |
| CAPITAL FUND MANAGEMENT S.A. 0.29% of their portfolio | 289.6k $13.0m | Added +78.4k |
| CITADEL ADVISORS LLC 0.01% of their portfolio | 266.6k $12.0m | Reduced -43.2k |
| BAILLIE GIFFORD & CO 0.01% of their portfolio | 263.1k $11.8m | Unchanged |
| PRINCIPAL FINANCIAL GROUP INC 0.01% of their portfolio | 254.1k $11.4m | Added +3.5k |
| Connor, Clark & Lunn Investment Management Ltd. 0.06% of their portfolio | 240.9k $10.8m | Added +226.2k |
| AMERIPRISE FINANCIAL INC 0.00% of their portfolio | 215.9k $9.7m | Reduced -2.7k |
| Atika Capital Management LLC 1.39% of their portfolio | 202.3k $9.1m | New |
| JPMORGAN CHASE & CO 0.00% of their portfolio | 201.7k $9.1m | Added +40.7k |
| ADAGE CAPITAL PARTNERS GP, L.L.C. 0.02% of their portfolio | 200.0k $9.0m | New |
| RHUMBLINE ADVISERS 0.01% of their portfolio | 189.5k $8.5m | Added +8.3k |
| Coronation Fund Managers Ltd. 0.23% of their portfolio | 185.1k $8.3m | New |
| PEREGRINE CAPITAL MANAGEMENT LLC 0.26% of their portfolio | 184.9k $8.3m | Reduced -5.6k |
| Cubist Systematic Strategies, LLC 0.07% of their portfolio | 184.6k $8.3m | Reduced -482 |
| ESSEX INVESTMENT MANAGEMENT CO LLC 1.25% of their portfolio | 179.0k $8.0m | Reduced -39.0k |
| NOMURA HOLDINGS INC 0.08% of their portfolio | 168.5k $7.6m | Reduced -21.7k |
| Swiss National Bank 0.01% of their portfolio | 155.1k $7.0m | Added +3.4k |
| Amundi 0.00% of their portfolio | 155.0k $6.5m | Added +21.4k |
| D. E. Shaw & Co., Inc. 0.01% of their portfolio | 152.0k $6.8m | Added +129.6k |
| WCM INVESTMENT MANAGEMENT, LLC 0.02% of their portfolio | 150.6k $6.8m | Reduced -2.2k |
| FRED ALGER MANAGEMENT, LLC 0.04% of their portfolio | 145.2k $6.5m | Reduced -34.5k |
| Mirae Asset Global Investments Co., Ltd. 0.02% of their portfolio | 144.9k $6.5m | Added +39.0k |
| SILVERCREST ASSET MANAGEMENT GROUP LLC 0.05% of their portfolio | 140.7k $6.3m | Reduced -2.2k |
| Weiss Multi-Strategy Advisers LLC 0.16% of their portfolio | 127.0k $5.7m | Added +104.3k |
| Skandinaviska Enskilda Banken AB (publ) 0.04% of their portfolio | 122.6k $5.5m | Reduced -62 |
| California Public Employees Retirement System 0.00% of their portfolio | 118.4k $5.3m | Reduced -27.5k |
| BANK OF AMERICA CORP /DE/ 0.00% of their portfolio | 116.0k $5.2m | Reduced -12.5k |
| FRONTIER CAPITAL MANAGEMENT CO LLC 0.06% of their portfolio | 114.2k $5.1m | Reduced -337 |
| AMERICAN INTERNATIONAL GROUP, INC. 0.03% of their portfolio | 100.4k $4.5m | Reduced -1.2k |
| Invesco Ltd. 0.00% of their portfolio | 100.3k $4.5m | Reduced -1.1m |
| STATE OF WISCONSIN INVESTMENT BOARD 0.01% of their portfolio | 99.4k $4.5m | Added +6.1k |
| OSTERWEIS CAPITAL MANAGEMENT INC 0.31% of their portfolio | 96.1k $4.3m | Reduced -1.7k |
| Legal & General Group Plc 0.00% of their portfolio | 95.6k $4.3m | Reduced -1.4k |
| ALLIANCEBERNSTEIN L.P. 0.00% of their portfolio | 93.0k $4.2m | Added +561 |
| DEUTSCHE BANK AG\ 0.00% of their portfolio | 91.4k $4.1m | Added +19.1k |
| Altium Capital Management LLC 2.07% of their portfolio | 90.0k $4.0m | New |
| UBS AM, a distinct business unit of UBS ASSET MANAGEMENT AMERICAS LLC 0.00% of their portfolio | 88.4k $4.0m | Added +5.9k |
| Assenagon Asset Management S.A. 0.02% of their portfolio | 87.5k $3.9m | Reduced -202.7k |
| BARCLAYS PLC 0.00% of their portfolio | 87.3k $3.9m | First filing |
| Retirement Systems of Alabama 0.02% of their portfolio | 84.7k $3.8m | Added +671 |
| CREDIT SUISSE AG/ 0.00% of their portfolio | 83.2k $3.7m | Added +16.2k |
| CALIFORNIA STATE TEACHERS RETIREMENT SYSTEM 0.01% of their portfolio | 81.5k $3.7m | Added +1.1k |
| SEI INVESTMENTS CO 0.01% of their portfolio | 80.5k $3.6m | Reduced -29.2k |
| Bridgewater Associates, LP 0.02% of their portfolio | 75.8k $3.4m | Reduced -25.9k |
| VICTORY CAPITAL MANAGEMENT INC 0.00% of their portfolio | 75.1k $3.4m | Added +9.6k |
| VOYA INVESTMENT MANAGEMENT LLC 0.00% of their portfolio | 73.4k $3.3m | Reduced -49.0k |
| Lombard Odier Asset Management (Switzerland) SA 0.26% of their portfolio | 73.1k $3.3m | Reduced -79.5k |
| Quantbot Technologies LP 0.23% of their portfolio | 72.3k $3.3m | New |
| SUSQUEHANNA INTERNATIONAL GROUP, LLP 0.01% of their portfolio | 70.5k $3.2m | Added +11.9k |
| Squarepoint Ops LLC 0.02% of their portfolio | 68.3k $3.1m | Reduced -299.4k |
| STATE BOARD OF ADMINISTRATION OF FLORIDA RETIREMENT SYSTEM 0.01% of their portfolio | 68.2k $3.1m | Reduced -1.9k |
| Qube Research & Technologies Ltd 0.02% of their portfolio | 66.8k $3.0m | New |
| ALGERT GLOBAL LLC 0.16% of their portfolio | 65.2k $2.9m | Added +4.1k |
| NEW YORK STATE TEACHERS RETIREMENT SYSTEM 0.01% of their portfolio | 64.1k $2.9m | Reduced -825 |
| KBC Group NV 0.01% of their portfolio | 62.6k $2.8m | Added +1.1k |
| CANADA LIFE ASSURANCE Co 0.01% of their portfolio | 60.2k $2.7m | Added +13.6k |
| KENNEDY CAPITAL MANAGEMENT LLC 0.08% of their portfolio | 59.5k $2.7m | Reduced -102.2k |
| State of New Jersey Common Pension Fund D 0.01% of their portfolio | 58.9k $2.6m | Added +8.5k |
| CANADA PENSION PLAN INVESTMENT BOARD 0.00% of their portfolio | 57.3k $2.6m | Added +21.3k |
| Millrace Asset Group, Inc. 2.87% of their portfolio | 56.2k $2.5m | New |
| MUTUAL OF AMERICA CAPITAL MANAGEMENT LLC 0.03% of their portfolio | 52.8k $2.4m | Reduced -3.8k |
| CAPITAL INTERNATIONAL LTD /CA/ 0.16% of their portfolio | 52.3k $2.4m | Added +7.2k |
| MANUFACTURERS LIFE INSURANCE COMPANY, THE 0.00% of their portfolio | 51.8k $2.3m | Reduced -286 |
| State of Tennessee, Department of Treasury 0.01% of their portfolio | 50.0k $2.2m | New |