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 ($986.8k this quarter). Holder counts are more reliable. Shares outstanding: 64.6m as of 2023-04-28, 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 ≈ $40.63. Options: 10 managers hold calls ($9.7m notional), 7 hold puts ($4.3m).
Trends to Q1 2023
Institutional holders
Managers reporting a position, each quarter
Numbers
| Quarter | Holders |
|---|---|
| Q3 2022 | 298 |
| Q4 2022 | 295 |
| Q1 2023 | 275 |
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 |
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 |
| Q1 2023 | $9.7m | $4.3m | 0.44 |
Biggest buyers
| FMR LLC | Added | +6.8m |
| BlackRock Inc. | Added | +2.9m |
| Capital World Investors | Added | +1.1m |
| VANGUARD GROUP INC | Added | +920.2k |
| JANUS HENDERSON GROUP PLC | Added | +828.5k |
| MORGAN STANLEY | Added | +456.2k |
| VOLORIDGE INVESTMENT MANAGEMENT, LLC | Added | +434.8k |
| Tri Locum Partners LP | New | +417.4k |
| JACOBS LEVY EQUITY MANAGEMENT, INC | Added | +278.0k |
| STATE STREET CORP | Added | +239.7k |
Biggest sellers
| MARSHALL WACE, LLP | Sold out | -881.3k |
| Point72 Asset Management, L.P. | Sold out | -359.6k |
| AXA S.A. | Reduced | -337.5k |
| Granite Investment Partners, LLC | Sold out | -319.5k |
| MILLENNIUM MANAGEMENT LLC | Reduced | -318.4k |
| EMINENCE CAPITAL, LP | Reduced | -313.8k |
| Balyasny Asset Management L.P. | Reduced | -300.7k |
| MACQUARIE GROUP LTD | Reduced | -293.3k |
| NORTHERN TRUST CORP | Reduced | -232.3k |
| GOLDMAN SACHS GROUP INC | Reduced | -195.2k |
Biggest calls
| JANE STREET GROUP, LLC | Added | $4.0m99.6k shares |
| CITADEL ADVISORS LLC | Reduced | $2.0m49.1k shares |
| SUSQUEHANNA INTERNATIONAL GROUP, LLP | Added | $1.4m35.2k shares |
| SIMPLEX TRADING, LLC | Added | $686.0k16.9k shares |
| Squarepoint Ops LLC | Reduced | $568.5k14.0k shares |
| TWO SIGMA SECURITIES, LLC | Added | $373.6k9.2k shares |
| Cubist Systematic Strategies, LLC | Reduced | $353.3k8.7k shares |
| GROUP ONE TRADING LLC | Reduced | $138.1k3.4k shares |
| Walleye Capital LLC | New | $121.8k3.0k shares |
| CONCOURSE FINANCIAL GROUP SECURITIES, INC. | Unchanged | $00 shares |
Biggest puts
| CITADEL ADVISORS LLC | Reduced | $2.6m63.5k shares |
| SUSQUEHANNA INTERNATIONAL GROUP, LLP | New | $881.2k21.7k shares |
| TWO SIGMA SECURITIES, LLC | New | $320.8k7.9k shares |
| JANE STREET GROUP, LLC | Reduced | $231.5k5.7k shares |
| GROUP ONE TRADING LLC | New | $162.4k4.0k shares |
| SIMPLEX TRADING, LLC | Reduced | $129.0k3.2k shares |
| CONCOURSE FINANCIAL GROUP SECURITIES, INC. | Unchanged | $00 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 Q1 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 |
|---|---|---|---|---|---|
| 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 | — |
| Q1 2023 | 0 | — | 1 | $411.9k | — |
| Date | Insider | Trade | Value |
|---|---|---|---|
| 2023-03-03 | BERGER DAVID B EVP & Chief Operating Officer | Sold | $411.9k10.0k 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, Q1 2023
| Manager | Shares | Change |
|---|---|---|
| FMR LLC 0.03% of their portfolio | 16.5m $669.2m | Added +6.8m |
| BlackRock Inc. 0.01% of their portfolio | 9.2m $373.9m | Added +2.9m |
| VANGUARD GROUP INC 0.01% of their portfolio | 7.0m $286.2m | Added +920.2k |
| Capital World Investors 0.05% of their portfolio | 6.0m $241.9m | Added +1.1m |
| Champlain Investment Partners, LLC 0.84% of their portfolio | 3.3m $132.9m | Added +204.2k |
| EMINENCE CAPITAL, LP 1.69% of their portfolio | 2.5m $100.3m | Reduced -313.8k |
| BROWN CAPITAL MANAGEMENT LLC 1.32% of their portfolio | 2.2m $88.2m | Added +155.4k |
| STATE STREET CORP 0.00% of their portfolio | 2.1m $83.9m | Added +239.7k |
| Bellevue Group AG 1.06% of their portfolio | 1.8m $72.8m | Added +2.3k |
| JANUS HENDERSON GROUP PLC 0.03% of their portfolio | 1.3m $52.6m | Added +828.5k |
| Capital International Investors 0.01% of their portfolio | 1.3m $51.2m | Added +24.7k |
| Stephens Investment Management Group LLC 0.70% of their portfolio | 1.0m $41.8m | Added +46.8k |
| TWO SIGMA ADVISERS, LP 0.11% of their portfolio | 1.0m $41.6m | Added +62.3k |
| GEODE CAPITAL MANAGEMENT, LLC 0.00% of their portfolio | 936.7k $38.0m | Added +22.3k |
| MORGAN STANLEY 0.00% of their portfolio | 931.8k $37.8m | Added +456.2k |
| TWO SIGMA INVESTMENTS, LP 0.11% of their portfolio | 922.5k $37.5m | Added +42.8k |
| Bank of New York Mellon Corp 0.01% of their portfolio | 590.6k $24.0m | Reduced -49.1k |
| First Light Asset Management, LLC 2.15% of their portfolio | 589.2k $23.9m | Added +3.0k |
| NORGES BANK 0.00% of their portfolio | 557.9k $22.7m | Reduced -75.0k |
| VOLORIDGE INVESTMENT MANAGEMENT, LLC 0.10% of their portfolio | 484.6k $19.7m | Added +434.8k |
| Nuveen Asset Management, LLC 0.01% of their portfolio | 483.3k $19.6m | Reduced -53.6k |
| Octagon Capital Advisors LP 2.78% of their portfolio | 474.9k $19.3m | Unchanged |
| BNP PARIBAS ASSET MANAGEMENT Holding S.A. 0.06% of their portfolio | 454.6k $18.5m | Added +87.0k |
| Eagle Health Investments LP 3.36% of their portfolio | 425.5k $17.3m | Reduced -165.0k |
| Tri Locum Partners LP 5.16% of their portfolio | 417.4k $17.0m | New |
| NEW YORK STATE COMMON RETIREMENT FUND 0.02% of their portfolio | 398.9k $16.2m | Added +22.8k |
| PRINCIPAL FINANCIAL GROUP INC 0.01% of their portfolio | 387.6k $15.7m | Added +133.5k |
| NORTHERN TRUST CORP 0.00% of their portfolio | 364.1k $14.8m | Reduced -232.3k |
| CHARLES SCHWAB INVESTMENT MANAGEMENT INC 0.00% of their portfolio | 348.4k $14.2m | Added +5.9k |
| Chicago Capital, LLC 0.61% of their portfolio | 303.0k $12.3m | Reduced -25.2k |
| Invesco Ltd. 0.00% of their portfolio | 297.9k $12.1m | Added +197.6k |
| MILLENNIUM MANAGEMENT LLC 0.01% of their portfolio | 294.9k $12.0m | Reduced -318.4k |
| JACOBS LEVY EQUITY MANAGEMENT, INC 0.07% of their portfolio | 293.3k $11.9m | Added +278.0k |
| PRICE T ROWE ASSOCIATES INC /MD/ 0.00% of their portfolio | 291.2k $11.8m | Added +925 |
| AMERIPRISE FINANCIAL INC 0.00% of their portfolio | 287.5k $11.7m | Added +71.6k |
| Balyasny Asset Management L.P. 0.04% of their portfolio | 280.2k $11.4m | Reduced -300.7k |
| BAILLIE GIFFORD & CO 0.01% of their portfolio | 262.9k $10.7m | Reduced -141 |
| BANK OF AMERICA CORP /DE/ 0.00% of their portfolio | 255.4k $10.4m | Added +139.5k |
| ADAGE CAPITAL PARTNERS GP, L.L.C. 0.02% of their portfolio | 250.0k $10.2m | Added +50.0k |
| Connor, Clark & Lunn Investment Management Ltd. 0.05% of their portfolio | 247.3k $10.0m | Added +6.4k |
| D. E. Shaw & Co., Inc. 0.02% of their portfolio | 245.6k $10.0m | Added +93.6k |
| DIMENSIONAL FUND ADVISORS LP 0.00% of their portfolio | 244.6k $9.9m | Added +207.2k |
| AXA S.A. 0.03% of their portfolio | 241.7k $9.8m | Reduced -337.5k |
| FRED ALGER MANAGEMENT, LLC 0.05% of their portfolio | 224.4k $9.1m | Added +79.2k |
| CAPITAL FUND MANAGEMENT S.A. 0.16% of their portfolio | 205.7k $8.4m | Reduced -83.9k |
| Soleus Capital Management, L.P. 1.02% of their portfolio | 203.3k $8.3m | Reduced -109.2k |
| Legal & General Group Plc 0.00% of their portfolio | 191.4k $7.8m | Added +95.8k |
| PEREGRINE CAPITAL MANAGEMENT LLC 0.22% of their portfolio | 190.5k $7.7m | Added +5.6k |
| ESSEX INVESTMENT MANAGEMENT CO LLC 1.11% of their portfolio | 187.7k $7.6m | Added +8.7k |
| SUSQUEHANNA INTERNATIONAL GROUP, LLP 0.01% of their portfolio | 187.3k $7.6m | Added +116.9k |
| Amundi 0.00% of their portfolio | 181.3k $7.5m | Added +26.3k |
| CITADEL ADVISORS LLC 0.01% of their portfolio | 180.1k $7.3m | Reduced -86.6k |
| RHUMBLINE ADVISERS 0.01% of their portfolio | 177.6k $7.2m | Reduced -11.9k |
| SILVERCREST ASSET MANAGEMENT GROUP LLC 0.05% of their portfolio | 163.6k $6.6m | Added +22.9k |
| Cubist Systematic Strategies, LLC 0.06% of their portfolio | 161.8k $6.6m | Reduced -22.8k |
| NOMURA HOLDINGS INC 0.06% of their portfolio | 153.5k $6.2m | Reduced -15.0k |
| WCM INVESTMENT MANAGEMENT, LLC 0.02% of their portfolio | 151.1k $6.1m | Added +456 |
| Coronation Fund Managers Ltd. 0.16% of their portfolio | 150.3k $6.1m | Reduced -34.8k |
| FRONTIER CAPITAL MANAGEMENT CO LLC 0.06% of their portfolio | 148.8k $6.0m | Added +34.6k |
| Mirae Asset Global Investments Co., Ltd. 0.01% of their portfolio | 148.4k $6.0m | Added +3.5k |
| GOLDMAN SACHS GROUP INC 0.00% of their portfolio | 146.5k $5.9m | Reduced -195.2k |
| Atika Capital Management LLC 0.92% of their portfolio | 145.3k $5.9m | Reduced -56.9k |
| Jump Financial, LLC 0.24% of their portfolio | 144.1k $5.9m | Added +122.4k |
| JPMORGAN CHASE & CO 0.00% of their portfolio | 144.1k $5.9m | Reduced -57.6k |
| Swiss National Bank 0.00% of their portfolio | 138.7k $5.6m | Reduced -16.4k |
| ExodusPoint Capital Management, LP 0.06% of their portfolio | 123.1k $5.0m | Added +84.6k |
| Skandinaviska Enskilda Banken AB (publ) 0.03% of their portfolio | 122.4k $5.0m | Reduced -201 |
| Sessa Capital IM, L.P. 0.20% of their portfolio | 121.8k $4.9m | New |
| Public Sector Pension Investment Board 0.03% of their portfolio | 113.1k $4.6m | New |
| BARCLAYS PLC 0.00% of their portfolio | 100.8k $4.1m | Added +13.5k |
| BANQUE PICTET & CIE SA 0.04% of their portfolio | 98.1k $4.0m | New |
| Weiss Multi-Strategy Advisers LLC 0.10% of their portfolio | 96.0k $3.9m | Reduced -31.1k |
| 1492 Capital Management LLC 2.39% of their portfolio | 95.2k $3.9m | Added +80.6k |
| ALGERT GLOBAL LLC 0.18% of their portfolio | 92.6k $3.8m | Added +27.4k |
| UBS AM, a distinct business unit of UBS ASSET MANAGEMENT AMERICAS LLC 0.00% of their portfolio | 92.0k $3.7m | Added +3.6k |
| STATE OF WISCONSIN INVESTMENT BOARD 0.01% of their portfolio | 91.4k $3.7m | Reduced -8.0k |
| California Public Employees Retirement System 0.00% of their portfolio | 91.2k $3.7m | Reduced -27.2k |
| VICTORY CAPITAL MANAGEMENT INC 0.00% of their portfolio | 91.2k $3.7m | Added +16.1k |
| CANADA PENSION PLAN INVESTMENT BOARD 0.01% of their portfolio | 88.7k $3.6m | Added +31.4k |
| SEI INVESTMENTS CO 0.01% of their portfolio | 83.0k $3.4m | Added +2.5k |
| CREDIT SUISSE AG/ 0.00% of their portfolio | 81.5k $3.3m | Reduced -1.7k |
| CALIFORNIA STATE TEACHERS RETIREMENT SYSTEM 0.00% of their portfolio | 80.4k $3.3m | Reduced -1.1k |
| CANADA LIFE ASSURANCE Co 0.01% of their portfolio | 79.7k $3.2m | Added +19.5k |
| Bridgewater Associates, LP 0.02% of their portfolio | 79.0k $3.2m | Added +3.1k |
| NEW YORK STATE TEACHERS RETIREMENT SYSTEM 0.01% of their portfolio | 73.6k $3.0m | Added +9.5k |
| Quantbot Technologies LP 0.21% of their portfolio | 71.4k $2.9m | Reduced -919 |
| Lombard Odier Asset Management (Switzerland) SA 0.25% of their portfolio | 70.9k $2.9m | Reduced -2.2k |
| TUDOR INVESTMENT CORP ET AL 0.05% of their portfolio | 70.2k $2.9m | New |
| State of Tennessee, Department of Treasury 0.01% of their portfolio | 68.7k $2.8m | Added +18.7k |
| UBS Group AG 0.00% of their portfolio | 68.4k $2.8m | Added +30.7k |
| STATE BOARD OF ADMINISTRATION OF FLORIDA RETIREMENT SYSTEM 0.01% of their portfolio | 68.2k $2.8m | Unchanged |
| COMMONWEALTH OF PENNSYLVANIA PUBLIC SCHOOL EMPLS RETRMT SYS 0.02% of their portfolio | 68.1k $2.8m | Added +39.2k |
| KBC Group NV 0.01% of their portfolio | 67.9k $2.8m | Added +5.3k |
| Gotham Asset Management, LLC 0.06% of their portfolio | 64.6k $2.6m | Added +20.8k |
| Thrivent Financial for Lutherans 0.01% of their portfolio | 63.7k $2.6m | Added +46.6k |
| BNP PARIBAS FINANCIAL MARKETS 0.01% of their portfolio | 63.3k $2.6m | Added +17.8k |
| PRUDENTIAL FINANCIAL INC 0.00% of their portfolio | 59.7k $2.4m | New |
| KENNEDY CAPITAL MANAGEMENT LLC 0.07% of their portfolio | 59.6k $2.4m | Added +76 |
| VOYA INVESTMENT MANAGEMENT LLC 0.00% of their portfolio | 59.3k $2.4m | Reduced -14.1k |
| State of New Jersey Common Pension Fund D 0.01% of their portfolio | 58.9k $2.4m | Unchanged |