ALEC Historical PE Ratio Notes

— Alector (ticker symbol ALEC) is a clinical-stage biotechnology company focused on developing immuno-neurology therapies for the treatment of neurodegenerative diseases like Alzheimer’s & frontotemporal dementia. The company leverages its expertise in immunology & human genetics to discover drug candidates that modulate immune system pathways in the brain. This innovative but high-risk research often means that Alector operates at a loss or with minimal earnings until late-stage clinical results or regulatory approvals emerge. As a result, when reviewing ALEC’s historical price-to-earnings (PE) ratio data, you may notice frequent periods where the ratio is negative or undefined (since the company had negative earnings), or unusually high during brief instances of positive earnings (often due to milestone payments or collaborations). For biotechs like ALEC, the historical PE ratio may not consistently reflect the company’s true value or market sentiment, as investors tend to price in future potential, milestones, & partnerships rather than current profits. When you review the historical charts & tables, keep in mind that changes in PE often correspond more to fluctuations in earnings related to R&D expenses, partnership revenue, or major pipeline updates, rather than sustainable long-term profits.

On this page we presented the Alector Historical PE Ratio information for Alector' stock. The average ALEC historical PE based on using the annualized quarterly earnings result at each measurement period (for the "E" in the PE calculation; and the closing price on earnings date as the "P") is 36.9. Meanwhile, using the trailing twelve month (TTM) quarterly earnings result as our method of calculation the "E" value at each measurement period, the average ALEC historical PE based on this TTM earnings result method is 29.1. Note: any PE calculations involving negative earnings were discarded as not meaningful.

Let's now compare this ALEC historical PE result, against the recent PE: when this page was posted on 9/4/2026, the most recent closing price for ALEC had been 2.46, and the most recent quarterly earnings result, annualized, was 0.08. Meanwhile, the most recent TTM earnings summed to 0.39. From these numbers, we calculate the recent ALEC PE on 9/4/2026 based on annualized quarterly EPS was 30.8. Based on ALEC's history, that recent PE is low relative to the historical average, with the recent PE 16.5% lower than the historical average PE across our data set for Alector. Looking at the recent ALEC PE on 9/4/2026 based on TTM EPS, we calculate the ratio at 6.3. Based on ALEC's history, that recent PE is low relative to the historical average, with the recent PE 78.4% lower than the average PE across our Alector data set with TTM EPS used in the calculation at each period.

For self directed investors doing their due diligence on ALEC or any other given stock, valuation analysis for ALEC can greatly benefit from studying the past earnings and resulting PE calculations. This exercise can help inform an analysis as to whether the past earnings trajectory and current versus historical PE ratios justify the current stock value.

That's why we bring you HistoricalPERatio.com to make it easy for investors to investigate Alector PE history or the past PE information for any stock in our coverage universe. And in your continued research we hope you will be sure to check out the further links included for earnings surprises history (beat/miss data) as well as next earnings dates for ALEC. Thanks for visiting, and the next time you need to research ALEC Historical PE Ratio or the ratio for another stock, we hope you'll think of our site, as your go-to historical PE ratio research resource of choice.