Stocks › TNDM
TANDEM DIABETES CARE INC
TNDM·Nasdaq·
United States·USD
United States·USD$16.16
-0.36 (-2.18%)
Close · Oct 6, 2026 · Close Prices from Tiingo.com
TNDM
TANDEM DIABETES CARE INC · Nasdaq
Nasdaq 100S&P 500
Filings
Default90D1Y5YALL
TNDMS&P 500 (rebased)
Congress BuyCongress SellInsider BuyInsider SellForm 1448-K ResultsLobbying
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Daily closes, adjusted for splits and dividends · Close Prices from Tiingo.comHover a marker, every one is a filing · move across the line for the crosshair
Congressional Trades
Recent trades of TNDM by members of U.S. Congress · 9 on record · 2 in the last 12 months
Whale Activity
Position changes in TNDM reported for 2026-06-30 by 12 tracked institutional filers
- Increased6
- New0
- Held0
- Decreased3
- Closed1
- No prior filing2
| Filer | Shares | Value | Change |
|---|---|---|---|
| BlackRock, Inc. | 11.6M | $174.8M | increased |
| VANGUARD PORTFOLIO MANAGEMENT LLC | 4.3M | $64.9M | increased |
| VANGUARD CAPITAL MANAGEMENT LLC | 3.1M | $46.7M | increased |
| Opti Capital Management, LP | 27.5M | $26.4M | — |
| CITADEL ADVISORS LLC | 1.7M | $26.2M | decreased |
| MILLENNIUM MANAGEMENT LLC | 1.3M | $19.8M | increased |
| D. E. Shaw & Co., Inc. | 681.8K | $10.3M | decreased |
| Point72 Asset Management, L.P. | 610.9K | $9.2M | increased |
| TWO SIGMA INVESTMENTS, LP | 558.4K | $8.4M | decreased |
| BlackRock, Inc. | 7.0M | $6.6M | increased |
| Nierenberg Investment Management Company, LLC | 158.9K | $2.4M | — |
| Renaissance Technologies | 0 | $0 | closed |
KeyVex tracks a curated set of large 13F filers plus the largest positions in recent filings, so this is a sample of institutional activity, not the whole market.
Insider Trading
Net shares bought (+) or sold (−) on the open market by TNDM insiders, by quarter · Form 4
Recent Insider Transactions
2,474 transactions on record · newest first
| Insider | Type | Shares | Price | Value | Date | |
|---|---|---|---|---|---|---|
| Gasser Elizabeth AnneEVP, Chief Strategy Officer | Gift | +7,160 | $0.00 | $0 | Jun 2, 2026 | Form 4 ↗ |
| Gasser Elizabeth AnneEVP, Chief Strategy Officer | Gift | −7,160 | $0.00 | $0 | Jun 2, 2026 | Form 4 ↗ |
| Allen Dick | Option exercise | +8,759 | $0.00 | $0 | May 21, 2026 | Form 4 ↗ |
| Howell Peyton RDirector | Option exercise | +8,759 | $0.00 | $0 | May 21, 2026 | Form 4 ↗ |
| Malagueira Joao Paulo FalcaoDirector | Option exercise | +8,759 | $0.00 | $0 | May 21, 2026 | Form 4 ↗ |
| Sodhi RajwantDirector | Option exercise | +8,759 | $0.00 | $0 | May 21, 2026 | Form 4 ↗ |
| McGroddy-Goetz KathleenDirector | Option exercise | +8,759 | $0.00 | $0 | May 21, 2026 | Form 4 ↗ |
| ROBERTSON REBECCA BDirector | Option exercise | +8,759 | $0.00 | $0 | May 21, 2026 | Form 4 ↗ |
| TWOMEY CHRISTOPHER JDirector | Option exercise | +8,759 | $0.00 | $0 | May 21, 2026 | Form 4 ↗ |
| Cha MyoungilDirector | Option exercise | +8,759 | $0.00 | $0 | May 21, 2026 | Form 4 ↗ |
| Carpenter RickEVP & Chief Technology Officer | Grant / award | +1,336 | $10.90 | $15K | May 15, 2026 | Form 4 ↗ |
| Carpenter RickEVP & Chief Technology Officer | Tax withholding | −3,277 | $12.82 | $42K | May 15, 2026 | Form 4 ↗ |
| Carpenter RickEVP & Chief Technology Officer | Option exercise | +6,439 | $0.00 | $0 | May 15, 2026 | Form 4 ↗ |
| Carpenter RickEVP & Chief Technology Officer | Tax withholding | −457 | $12.82 | $6K | May 15, 2026 | Form 4 ↗ |
| Carpenter RickEVP & Chief Technology Officer | Option exercise | +898 | $0.00 | $0 | May 15, 2026 | Form 4 ↗ |
| Carpenter RickEVP & Chief Technology Officer | Tax withholding | −732 | $12.82 | $9K | May 15, 2026 | Form 4 ↗ |
| Carpenter RickEVP & Chief Technology Officer | Option exercise | +1,437 | $0.00 | $0 | May 15, 2026 | Form 4 ↗ |
| Gasser Elizabeth AnneEVP, Chief Strategy Officer | Grant / award | +1,337 | $10.90 | $15K | May 15, 2026 | Form 4 ↗ |
| Gasser Elizabeth AnneEVP, Chief Strategy Officer | Tax withholding | −4,114 | $12.82 | $53K | May 15, 2026 | Form 4 ↗ |
| Gasser Elizabeth AnneEVP, Chief Strategy Officer | Option exercise | +7,667 | $0.00 | $0 | May 15, 2026 | Form 4 ↗ |
Fund Holders
Mutual funds and ETFs holding TNDM · SEC Form N-PORT
| Fund | Shares | Value | % of fund | As of |
|---|---|---|---|---|
| iShares Core S&P Small-Cap ETF iShares Trust | 4.1M | $62.3M | 0.06% | Jun 30, 2026 |
| VANGUARD TOTAL STOCK MARKET INDEX FUND VANGUARD INDEX FUNDS | 2.2M | $33.0M | 0.00% | Jun 30, 2026 |
| iShares Russell 2000 ETF iShares Trust | 1.8M | $27.4M | 0.03% | Jun 30, 2026 |
| VANGUARD SMALL-CAP INDEX FUND VANGUARD INDEX FUNDS | 1.6M | $23.7M | 0.01% | Jun 30, 2026 |
| Fidelity Small Cap Index Fund Fidelity Salem Street Trust | 763.5K | $14.9M | 0.04% | Jul 31, 2026 |
| VANGUARD SMALL-CAP GROWTH INDEX FUND VANGUARD INDEX FUNDS | 901.5K | $13.6M | 0.03% | Jun 30, 2026 |
| VANGUARD EXTENDED MARKET INDEX FUND VANGUARD INDEX FUNDS | 788.5K | $11.9M | 0.01% | Jun 30, 2026 |
| PGIM Jennison Health Sciences Fund Prudential Sector Funds, Inc. | 680.0K | $11.7M | 0.84% | May 29, 2026 |
| iShares Russell 2000 Growth ETF iShares Trust | 644.8K | $9.7M | 0.06% | Jun 30, 2026 |
| State Street(R) SPDR(R) Portfolio S&P 600(TM) Small Cap ETF SPDR SERIES TRUST | 628.0K | $9.5M | 0.06% | Jun 30, 2026 |
Mutual funds and ETFs whose N-PORT filings list TNDM's shares (CUSIP 875372203), each fund at its latest report since Mar 7, 2026, largest positions first. Bonds, options and short positions are left out.
Corporate Lobbying
Estimated quarterly lobbying spending reported under the LDA, filings naming tandem diabetes care as client
- THE NICKLES GROUP, LLCTANDEM DIABETES CARE · 2026 Q2 · MMM, BUD$50K
Filing ↗ - THE NICKLES GROUP, LLCTANDEM DIABETES CARE · 2026 Q1 · MMM, BUD$50K
Filing ↗ - THE NICKLES GROUP, LLCTANDEM DIABETES CARE · 2025 Q4 · MMM, BUD$50K
Filing ↗ - THE NICKLES GROUP, LLCTANDEM DIABETES CARE · 2025 Q3 · MMM, BUD$50K
Filing ↗ - THE NICKLES GROUP, LLCTANDEM DIABETES CARE · 2025 Q2 · MMM, BUD$50K
Filing ↗
Government Contracts
Federal awards to TANDEM DIABETES CARE INC · USAspending
No federal contract awards found for TANDEM DIABETES CARE INC.
U.S. Patents
Recent USPTO applications naming TANDEM DIABETES CARE INC
No USPTO patent applications found for TANDEM DIABETES CARE INC.
Annual Financials
From TNDM's 10-K filings · XBRL
No annual XBRL figures on record for TNDM. KeyVex's fundamentals cover about 130 large companies so far.
Stock Splits
Every split and reverse split in the price history
- 1-for-10Reverse splitOct 10, 2017
Split dates and ratios from the price history · Close Prices from Tiingo.com
Material Events (8-K)
Corporate events filed with the SEC
- 8-K · Items 2.02, 9.01Results of operationsAug 6, 2026
EDGAR ↗ - 8-K · Items 3.03, 5.02, 5.07, 9.01Modification of rights · Officer / director change · Shareholder voteMay 21, 2026
EDGAR ↗ - 8-K · Items 5.02Officer / director changeMay 15, 2026
EDGAR ↗ - 8-K · Items 2.02, 9.01Results of operationsMay 7, 2026
EDGAR ↗ - 8-K · Items 5.03, 9.01Bylaw amendmentDec 30, 2025
EDGAR ↗
About TANDEM DIABETES CARE INC
From SEC EDGAR company records
Industry (SIC 3841)Surgical & Medical Instruments & Apparatus
SectorHealthcare
HeadquartersSan Diego, CA
IncorporatedDE
SEC CIK0001438133 ↗