Alector, Inc. (ALEC)

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The chart shows the growth of an initial investment of $10,000 in Alector, Inc., comparing it to the performance of the S&P 500 index or another benchmark. All prices have been adjusted for splits and dividends.

Alector, Inc. (ALEC) has returned 37.82% so far this year and 74.80% over the past 12 months.

Based on dividend-adjusted daily data since Feb 7, 2019, ALEC's average daily return is +0.02%, while the average monthly return is -0.39%.

Historically, 44% of months were positive and 56% were negative. The best month was Jan 2020 with a return of +62.2%, while the worst month was Oct 2025 at -50.3%. The longest winning streak lasted 5 consecutive months, and the longest losing streak was 9 months.

On a daily basis, ALEC closed higher 50% of trading days. The best single day was Jul 2, 2021 with a return of +57.1%, while the worst single day was Oct 22, 2025 at -49.8%.

Alector, Inc. has an annualized alpha of -14.29%, beta of 1.48, and R² of 0.12 versus S&P 500 Index. Calculated based on daily prices since February 08, 2019.

• This stock participated in 130.23% of S&P 500 Index downside but only -11.72% of its upside — more exposed to losses than it benefited from rallies.
• R² of 0.12 means this stock moves largely independently of S&P 500 Index — capture ratios reflect limited market correlation rather than active downside protection. Consider using a more representative benchmark.

ALEC ranks 66 for risk / return — better than 66% of stocks on our site. You're getting solid returns for the risk taken. A good sign, especially for investors who want growth without excessive volatility.

The table below present risk-adjusted performance metrics for Alector, Inc. (ALEC) and compare them to a chosen benchmark (S&P 500 Index).

The Drawdowns chart displays portfolio losses from any high point along the way. Drawdowns are calculated considering price movements and all distributions paid, if any.

The table below displays the maximum drawdowns of the Alector, Inc.. A maximum drawdown is a measure of risk, indicating the largest reduction in portfolio value due to a series of losing trades.

The maximum drawdown for the Alector, Inc. was 97.71%, occurring on Apr 10, 2025. The portfolio has not yet recovered.

The current Alector, Inc. drawdown is 94.56%.

The chart below shows the rolling one-month volatility.

The chart below illustrates the trends in the financial health of Alector, Inc. over time, highlighting three key metrics: Total Revenue, Earnings Before Interest and Taxes (EBIT), and Net Income.

The Valuation section provides an overview of how Alector, Inc. is priced in the market compared to other companies in the Biotechnology industry. It includes key financial ratios that help investors assess whether the stock is undervalued or overvalued.