Latest Period
Q2 2026
Security Snapshot
TANDEM DIABETES CARE INC - Common Stock, par value $0.001 per share (TNDM) Institutional Ownership
CUSIP: 875372203
13F Institutional Holders and Ownership History from Q1 2016 to Q2 2026
Institutions Reporting
266
Shares (Excl. Options)
78,385,161
Price
$15.09
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- Security type / class
- Equity / Common Stock, par value $0.001 per share
- Symbol
- TNDM on Nasdaq
- All holders as of 30 Jun 2026
- Q2 2026
- Total 13F shares
- 78,385,161
- Total 13F value
- $1,183,529,673
- Portfolio coverage rank
- 0%
- Share change
- +120,867
- Value change
- -$16,159,281
- Number of holders
- 266
- Shares outstanding
- 68,947,349
- SEC-reported price per share
- $15.42
- Insider filing price
- $15.42
Latest holder snapshot
5 signals
Issuer context
Names, identifiers, and filing context for this profile.
3 identity fields
13F Shares, Excluding Options vs Price
13F Value, Excluding Options
Total Investors
Key facts
- TNDM - TANDEM DIABETES CARE INC - Common Stock, par value $0.001 per share is tracked under CUSIP 875372203.
- 266 institutions reported positions in Q2 2026.
- 6 significant owners is listed from Schedule 13D/13G reporting.
Change
- Holder count moved from 272 to 266 between Q1 2026 and Q2 2026.
- SEC-reported value moved from $1,508,278,195 to $1,183,529,673.
Research use
- You can quickly see who holds this security, then open quarter and manager detail pages for full evidence.
- 13F and Schedule 13D/13G sections are kept together so you can cross-check institutional and beneficial ownership context.
Evidence
Source: SEC Form 13F
Open SEC evidence
Latest holder context comes from 266 institutions filings for Q2 2026.
Security key
875372203
Latest holder period
Q2 2026
13F holders
266
13D/G owners
6
CIK / CUSIP context first
Open Q2 2026 holders
TNDM full holder history
TANDEM DIABETES CARE INC SEC filings
TANDEM DIABETES CARE INC company facts
TANDEM DIABETES CARE INC insider transactions
Broader feeds
Recent Quarterly Holder Reports
Open recent reporting periods for CUSIP 875372203:
13D/G owners
Significant owners
Large-stake holder rows connected to Schedule 13D/G evidence.
Rows
6
Security
TNDM
| Filer | Ownership | Change % | Holdings Value | Net Change | Nb Shares | Change % | Reporting Name | Report Period |
|---|---|---|---|---|---|---|---|---|
| BlackRock, Inc. | 15% | $176,563,735 | 10,106,682 | BlackRock, Inc. | 31 Mar 2025 | |||
| Sessa Capital (Master), L.P. | 6.7% | $78,026,383 | 4,466,307 | Sessa Capital (Master), L.P. | 31 Mar 2025 | |||
| VANGUARD PORTFOLIO MANAGEMENT LLC | 5.9% | $77,682,093 | 4,052,274 | Vanguard Portfolio Management | 31 Mar 2026 | |||
| VANGUARD CAPITAL MANAGEMENT LLC | 5.2% | $68,125,809 | 3,553,772 | Vanguard Capital Management | 31 Mar 2026 | |||
| ArrowMark Colorado Holdings LLC | 4.3% | -24% | $62,272,841 | -$17,272,476 | 2,889,691 | -22% | ArrowMark Colorado Holdings, LLC | 31 Dec 2025 |
| Voya Financial, Inc. | 0.2% | -102% | $2,298,937 | -$64,680,655 | 149,088 | -97% | Voya Financial, Inc. | 30 Jun 2026 |
As of 30 Jun 2026, 266 institutional investors reported holding 78,385,161 shares of TANDEM DIABETES CARE INC - Common Stock, par value $0.001 per share (TNDM). This represents 114% of the company’s total 68,947,349 outstanding shares.
13F concentration
Top 25 institutional shareholders
Largest 13F positions for this security by reported shares and value.
Top holder share
83%
| Institution | Ownership % | Shares Held | Share Change % | Portfolio % | Holdings Value |
|---|---|---|---|---|---|
| BlackRock, Inc. | 17% | 11,583,125 | +8.3% | 0% | $174,789,356 |
| Sessa Capital IM, L.P. | 7.4% | 5,100,000 | +7.8% | 1.3% | $76,959,000 |
| VANGUARD PORTFOLIO MANAGEMENT LLC | 6.2% | 4,299,667 | +7.7% | 0% | $64,881,975 |
| First Light Asset Management, LLC | 4.9% | 3,383,553 | +157% | 3.1% | $51,057,815 |
| VANGUARD CAPITAL MANAGEMENT LLC | 4.5% | 3,096,536 | +1.9% | 0% | $46,726,728 |
| STATE STREET CORP | 4.1% | 2,851,646 | +7.1% | 0% | $43,031,338 |
| GW&K Investment Management, LLC | 3.7% | 2,569,032 | -4.5% | 0.3% | $38,767,000 |
| JENNISON ASSOCIATES LLC | 3.4% | 2,331,429 | +41% | 0.02% | $35,181,264 |
| Paradice Investment Management LLC | 2.9% | 2,024,014 | -0.9% | 4.9% | $30,542,371 |
| JACOBS LEVY EQUITY MANAGEMENT, INC | 2.9% | 2,006,429 | +32% | 0.11% | $30,277,014 |
| Freestone Grove Partners LP | 2.7% | 1,866,134 | +40% | 0.18% | $28,159,962 |
| GEODE CAPITAL MANAGEMENT, LLC | 2.6% | 1,800,797 | +7.2% | 0% | $27,179,463 |
| Driehaus Capital Management LLC | 2.6% | 1,786,996 | -22% | 0.16% | $26,965,770 |
| CITADEL ADVISORS LLC | 2.5% | 1,735,879 | -21% | 0.02% | $26,194,414 |
| MILLENNIUM MANAGEMENT LLC | 1.9% | 1,311,739 | +72% | 0.01% | $19,794,142 |
| Woodline Partners LP | 1.9% | 1,307,439 | 0.06% | $19,729,255 | |
| ArrowMark Colorado Holdings LLC | 1.9% | 1,299,586 | -58% | 0.82% | $19,610,753 |
| UBS Group AG | 1.7% | 1,146,580 | -44% | 0% | $17,301,892 |
| FMR LLC | 1.4% | 976,432 | +37% | 0% | $14,734,363 |
| ROYCE & ASSOCIATES LP | 1.3% | 900,590 | +29% | 0.11% | $13,589,903 |
| WELLINGTON MANAGEMENT GROUP LLP | 1.3% | 871,811 | -16% | 0% | $13,155,629 |
| GOLDMAN SACHS GROUP INC | 1.3% | 862,301 | -61% | 0% | $13,012,122 |
| NORTHERN TRUST CORP | 1.1% | 753,690 | +6.7% | 0% | $11,373,182 |
| Verition Fund Management LLC | 1% | 700,000 | +553% | 0.07% | $10,563,000 |
| ExodusPoint Capital Management, LP | 1% | 691,789 | +9.3% | 0.1% | $10,439,096 |
Quarter history
Institutional holders across reporting periods
Holder count, reported shares/value, and median price by quarter.
Periods
38
Latest
Q2 2026
Rows shown
1-25 of 38
| Period | 13F Shares, Excl. Options | Value, Excl. Options | Value Change | Price (Median) | Investors |
|---|---|---|---|---|---|
| 2026 Q2 | 78,385,161 | $1,183,529,673 | -$16,159,281 | $15.09 | 266 |
| 2026 Q1 | 78,656,708 | $1,508,278,195 | +$81,600,927 | $19.17 | 272 |
| 2025 Q4 | 74,868,446 | $1,645,564,994 | +$37,201,810 | $21.98 | 269 |
| 2025 Q3 | 75,062,169 | $911,087,579 | -$138,652,756 | $12.14 | 251 |
| 2025 Q2 | 80,970,548 | $1,506,919,626 | +$146,515,993 | $18.64 | 269 |
| 2025 Q1 | 73,028,420 | $1,399,471,204 | -$74,262,859 | $19.16 | 271 |
| 2024 Q4 | 72,082,680 | $2,596,593,509 | -$54,203,387 | $36.02 | 311 |
| 2024 Q3 | 73,070,303 | $3,098,544,283 | -$23,063,732 | $42.41 | 326 |
| 2024 Q2 | 73,624,715 | $2,966,330,226 | -$12,633,640 | $40.29 | 315 |
| 2024 Q1 | 74,163,562 | $2,626,695,815 | +$150,901,685 | $35.41 | 290 |
| 2023 Q4 | 70,841,842 | $2,095,507,190 | +$47,113,352 | $29.58 | 264 |
| 2023 Q3 | 69,587,644 | $1,445,242,152 | +$40,169,385 | $20.77 | 224 |
| 2023 Q2 | 67,061,755 | $1,645,737,206 | -$59,226,945 | $24.54 | 242 |
| 2023 Q1 | 68,103,120 | $2,765,613,824 | +$144,781,126 | $40.61 | 270 |
| 2022 Q4 | 64,356,332 | $2,890,283,528 | +$83,553,842 | $44.95 | 290 |
| 2022 Q3 | 62,774,623 | $3,005,075,951 | -$3,660,996 | $47.85 | 279 |
| 2022 Q2 | 61,447,968 | $3,637,020,281 | -$76,699,636 | $59.19 | 317 |
| 2022 Q1 | 59,516,284 | $6,922,056,028 | -$138,240,750 | $116.29 | 365 |
| 2021 Q4 | 60,391,589 | $9,087,447,171 | -$2,104,121 | $150.52 | 376 |
| 2021 Q3 | 61,294,210 | $7,318,019,845 | +$274,585,725 | $119.38 | 331 |
| 2021 Q2 | 59,035,893 | $5,750,025,560 | +$205,481,616 | $97.40 | 295 |
| 2021 Q1 | 57,554,702 | $5,079,400,953 | -$46,897,671 | $88.25 | 282 |
| 2020 Q4 | 58,469,670 | $5,594,436,203 | +$259,885,627 | $95.68 | 295 |
| 2020 Q3 | 54,610,664 | $6,195,906,490 | -$74,521,157 | $113.50 | 317 |
| 2020 Q2 | 55,340,731 | $5,467,195,169 | +$30,463,584 | $98.92 | 298 |