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Proterra Inc. (PTRA)

Equity · Currency in USD · Last updated May 21, 2022

Company Info

Trading Data

  • Previous Close$5.60
  • Year Range$4.70 - $19.17
  • EMA (50)$6.56
  • EMA (200)$9.34
  • Average Volume$2.53M
  • Market Capitalization$1.30B

PTRAShare Price Chart

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The chart shows the growth of $10,000 invested in Proterra Inc. on Nov 27, 2020 and compares it to the S&P 500 index or another benchmark. It would be worth nearly $5,665 for a total return of roughly -43.35%. All prices are adjusted for splits and dividends.

PTRA (Proterra Inc.)
Benchmark (^GSPC)

PTRAReturns in periods

Returns over 1 year are annualized


PTRAMonthly Returns Heatmap

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PTRASharpe Ratio Chart

The Sharpe ratio shows whether the portfolio's excess returns are due to smart investment decisions or a result of taking a higher risk. The higher a portfolio's Sharpe ratio, the better its risk-adjusted performance.

The current Proterra Inc. Sharpe ratio is -0.90. A negative Sharpe ratio means that the risk-free rate is higher than the portfolio's return. This value does not convey any meaningful information.

The chart below displays rolling 12-month Sharpe Ratio.

PTRA (Proterra Inc.)
Benchmark (^GSPC)

PTRADividend History

Proterra Inc. doesn't pay dividends

PTRADrawdowns Chart

The Drawdowns chart displays portfolio losses from any high point along the way.

PTRA (Proterra Inc.)
Benchmark (^GSPC)

PTRAWorst Drawdowns

The table below shows the maximum drawdowns of the Proterra Inc.. A maximum drawdown is an indicator of risk. It shows a reduction in portfolio value from its maximum due to a series of losing trades.

The maximum drawdown since January 2010 for the Proterra Inc. is 83.85%, recorded on May 11, 2022. The portfolio has not recovered from it yet.



To Bottom


To Recover



-83.85%Jan 20, 2021331May 11, 2022
-8.73%Jan 13, 20211Jan 13, 20211Jan 14, 20212
-6.49%Dec 29, 20204Jan 4, 20214Jan 8, 20218
-1.98%Dec 15, 20206Dec 22, 20201Dec 23, 20207
-1.87%Nov 27, 20201Nov 27, 20205Dec 4, 20206
-0.59%Dec 8, 20201Dec 8, 20203Dec 11, 20204

PTRAVolatility Chart

Current Proterra Inc. volatility is 104.28%. The chart below shows the rolling 10-day volatility. Volatility is a statistical measure showing how big price swings are in either direction. The higher asset volatility, the riskier it is, because the price movements are less predictable.

PTRA (Proterra Inc.)
Benchmark (^GSPC)

Portfolios with Proterra Inc.

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