What if you'd held MDB?
A $1,000 investment in MongoDB, Inc. (MDB) at the month-end close of 2017-10 would be worth $11,096 at the close on 2026-10-16: a +1009.6% price return. Through September 2026, the latest month the fund has reported, the same $1,000 became $11,461 in MDB and $3,421 in an S&P 500 index fund (TSP C Fund). The fund figure includes reinvested dividends; the stock figure does not, so the comparison favors the fund.
Your scenario
Result
If you'd bought $1,000 at the start of each year
Value of $1,000 invested on January 1 of each year and held to the latest close.
Every year, $1,000 from 2017
| Year | Value of $1,000 | Year return |
|---|---|---|
| 2017 | $1,000 | — |
| 2018 | $2,808 | +180.8% |
| 2019 | $4,424 | +57.6% |
| 2020 | $12,080 | +173.1% |
| 2021 | $17,794 | +47.3% |
| 2022 | $6,615 | -62.8% |
| 2023 | $13,745 | +107.8% |
| 2024 | $7,822 | -43.1% |
| 2025 | $14,114 | +80.4% |
| 2026 | $11,342 | -19.6% |
Best and worst month to buy
The best month to have bought MDB was 2018-01, at a close of $27.16: $1,000 then is $12,423 today. The worst was 2021-12, at $529: $1,000 then is $637.
FAQ
What would $1,000 in MDB be worth today?
About $11,096 at the latest close, a price return of +1009.6%. That is $1,000 put into MDB at the 2017-10 month-end close, the first in this price history.
What were the best and worst years for MDB?
MDB's best calendar year since 2017 was 2018, with a +180.8% return: $1,000 invested at the start of that year became about $2,808. Its worst year was 2022, at -62.8%.
Does the calculator include dividends and splits?
Splits only. Price return: adjusted for stock splits, dividends not included. Prices are split-adjusted automatically; a ticker whose history we could not adjust with confidence starts later or is not shown.
How much would $100 per month in MDB have grown?
To about $24,639 from $10,900 invested, putting in $100 at every monthly close since 2017-10.
Did MDB beat the S&P 500?
Yes. From the October 2017 month-end through September 2026, MDB beat an S&P 500 index fund by 235.0%: $1,000 in the fund (the TSP C Fund, dividends included) became $3,421, and $1,000 in MDB (price only) became $11,461. The fund's monthly returns are published at tsp.gov.
Is this investment advice?
No. Wall Street Regrets is an entertainment and education tool. Every number here is a historical calculation, and past performance never guarantees future results.
Methodology
The figures on this page use MDB's historical price data from 2017-10 to 2026-10. The tables and the calculator above use month-end closes.
Prices come from IEX Historical Data. A "year" scenario invests $1,000 at the prior December's month-end close and values it at the latest close. Amounts in other currencies are converted at month-end exchange rates published by the European Central Bank and, for earlier years, the Federal Reserve: into US dollars at the buy date's rate and back at the sell date's rate, so the return includes the currency move.
Prices are the last regular-session trade on IEX (Investors Exchange) each day, which can differ slightly from the official close. Month-end closes miss the highs and lows inside a month. Figures ignore taxes, fees and the currency effects of non-USD listings.
What if you'd held…
Prices as of the last IEX trade on 2026-10-16. Data delayed end-of-day.