How much would $1,000 invested in TNDM be worth today?

$1,000 invested in TNDM on October 20, 2016 would be worth $236 on October 20, 2026, with dividends reinvested — −13.4% a year compounded (CAGR).

How far back does the TNDM calculator go?

TNDM data begins November 14, 2013, with a close every session. Pick any start and end date in that span — 12 years, 11 months of history.

Does this include dividends?

Yes. The default "dividends reinvested" view uses split- and dividend-adjusted closing prices — a standard total-return approximation that excludes taxes and fees. A price-only view (split-adjusted, no dividends) is also available.

If You Invested $1,000 in Tandem Diabetes Care (TNDM): What It Would Be Worth Today

TNDM

$16.52+0.85%

as of close, Oct 20, 2026

☾ AH $16.52 +0.85%

Tandem Diabetes Care Inc.Stock · HealthcareRussell 2000 · 0.03% of IWMNasdaq Composite · 0.004% of ONEQUS Stock Market · 0.001% of VTIRussell 3000 · 0.001% of IWV

PeersMRNALLYMDTUNHJNJTMO

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Your investment#

How much

All at once, on the start date

Pick start & end dates10 years

Start

Key dates

Start at a well-known dateRecentMarket topsMarket bottomsEvents

Bought at that day's close

End

Key dates

End at a well-known dateMarket topsMarket bottomsEvents

Latest close, Oct 20, 2026

Or drag the slider to set start and end dates

2013 to today, log scale

Covid2022 bear market

20142018202020222024Oct 2016Today

Options

Result#

$1,000Oct 20, 2016$236Oct 20, 20260.24×your money

$1,000 invested in TNDM on October 20, 2016 was worth $236 on October 20, 2026, with dividends reinvested.

That’s −13.4% a year compounded (CAGR) over 10 years: 0.24 times your money.

Over the same dates the same $1,000 would be worth $4,210 in the S&P 500 and $6,533 in the Nasdaq-100: TNDM trailed both the S&P 500 and the Nasdaq-100.

Price only$236if dividends were spent

Biggest fall−96.8%Oct 20, 2016 to Nov 3, 2017

At a flat 5% a year$1,629a savings account's rate

Loss$764on $1,000 put in

How this period ranks#

Better than 67% of all 36 periods of 10 years since 2013.

Your dates

−100%1510%

Worst: −21.6% a year, Jan 2014 to Jan 2024Best: −10.9% a year, Sep 2014 to Sep 2024

One scale for every length, so longer periods bunch up. Point at a bar.

Growth of $1,000 in TNDM, October 20, 2016 to October 20, 2026#

Your $1,000$Your buySame plan in the S&P 500The highA lowLog scale: equal steps are equal percentage moves

Lowest value$32 · Nov 2017Highest value$2,189 · Dec 2021$145 · Aug 2025$677 · Mar 2020$1,100 · May 2021$

$100$1,000$3,000$236

20182020202220242026

How far TNDM was below its previous high. The biggest fall: −96.8% from Oct 20, 2016 to Nov 3, 2017, back to the high by Mar 13, 2019.

−96.8% from its high−93.4% from its high−47.4% from its high−36.8% from its high

high−97%

Your one buy. $1,000 on October 20, 2016, worth $236 on October 20, 2026. Pick Monthly or Yearly to see a plan's buys.

paid0.24×

What $1,000 would be worth on October 20, 2026, by start date#

Each point is the same amount invested that day and held to October 20, 2026, dividends reinvested. Above the line it made money.

Your start

$100$300$1,000$3,000

2014201620182020202220242026

$1,000 invested in TNDM, by year#

Started on each year's first close and held to Oct 20, 2026, dividends reinvested.

Started	Worth Oct 20, 2026	Multiple	A year (CAGR)	Same in the Nasdaq-100
2017	$787	0.79×	−2.4%	$6,414
2018	$6,504	6.5×	23.7%	$4,794
2019	$486	0.49×	−8.8%	$4,865
2020	$274	0.27×	−17.3%	$3,457
2021	$177	0.18×	−25.9%	$2,399
2022	$110	0.11×	−36.9%	$1,838
2023	$371	0.37×	−23.0%	$2,772
2024	$583	0.58×	−17.5%	$1,808
2025	$461	0.46×	−35.0%	$1,418
2026	$767	0.77×	—	$1,174

Methodology#

A buy is made at the start date's close, or the next session's when the market was closed that day, and valued at the end date's close; a monthly or yearly plan buys on the same day of each month or year. "Dividends reinvested" uses split- and dividend-adjusted closes (a standard total-return approximation; taxes and fees excluded). "Price-only" uses split-adjusted closes. TNDM data begins November 14, 2013; values as of October 20, 2026 and refresh daily. The ranking compares month-end to month-end periods. Past performance does not predict future returns; not investment advice.

See the live TNDM chart and fundamentals on the TNDM quote page or the S&P 500 return calculator.

FAQ#

How much would $1,000 invested in TNDM be worth today?: $1,000 invested in TNDM on October 20, 2016 would be worth $236 on October 20, 2026, with dividends reinvested — −13.4% a year compounded (CAGR).
How far back does the TNDM calculator go?: TNDM data begins November 14, 2013, with a close every session. Pick any start and end date in that span — 12 years, 11 months of history.
Does this include dividends?: Yes. The default "dividends reinvested" view uses split- and dividend-adjusted closing prices — a standard total-return approximation that excludes taxes and fees. A price-only view (split-adjusted, no dividends) is also available.

TNDM return calculator