Boiron SA (BOI) stock price history

Boiron SA (BOI) closed at its highest ever adjusted price, €62.46, on Apr 10, 2015. Its lowest close was €0.4685 on Jun 25, 1991.

-61.9% in price terms from the close ten years before Sep 28, 2026, which is -9.2% a year compounded. Over one year the return is -28.2%; over five years -25.7%.

-72.8% from the Apr 10, 2015 peak to the Mar 16, 2020 trough on adjusted closes; the previous peak has not been regained as of the last stored session.

The daily series starts on Jan 3, 1991 and runs to Sep 28, 2026: 9,217 trading sessions across 35.7 years. Minute bars start on Sep 17, 2026 and are captured forward, never backfilled.

Yes. The page uses the fully adjusted series, in which every past price is scaled for later splits and cash dividends so returns are comparable across the whole history. The API also serves raw prices, split adjusted only and dividend adjusted only.

Register for a free key and call the bars endpoint: it returns date, open, high, low, close and volume as JSON, one year back on the free plan and the full series from Jan 3, 1991 on Quant and above. Minute history comes with the paid plans.

Among complete calendar years, 2013 was the best at +101.8% and 2018 the worst at -33.1%, measured close to close.