The BioWorld Neurological Diseases Index (BNDI) finished 2025 up 6.33%, continuing the gains seen through November (closing up 2.64%), after reaching a low in July when it was down 22.48%. By comparison, the Nasdaq Biotechnology Index (NBI) ended the year up 32.4%, while the Dow Jones Industrial Average (DJIA) rose 12.97%. In the first two months of 2026, the BNDI slipped 1.24%, compared with gains of 5.85% for the NBI and 1.9% for the DJIA.
The BioWorld Neurological Diseases Index showed signs of recovery in August, narrowing its year-to-date decline to 14.31%, compared to a steeper drop of 22.34% at the end of May. Momentum shifted notably over the summer, with 17 of the 20 component companies posting gains between June and August. This marks a reversal from May, when 15 of the 20 stocks were in the red.
The BioWorld Neurological Diseases Index continued its downward slide into 2025, with 15 of the 20 component stocks posting losses. After dipping into negative territory in late February, the index dropped 15.99% by the end of March and closed May down 22.34%.
The BioWorld Neurological Diseases Index closed 2024 down 20.27%, extending its decline from -13.4% at the end of November. After falling to -12.2% in April, the index briefly rebounded, narrowing losses to under 4% by June, before experiencing a sharp downturn in the second half of the year.
By the end of November 2024, the BioWorld Neurological Diseases Index had dropped 13.4%, deepening its decline of 9.4% at the end of August. Meanwhile, the Dow Jones Industrial Average surged 19.16% in the first 11 months of the year, building on a 10.81% gain reported at the end of October. The Nasdaq Biotechnology Index posted a year-to-date increase of 6.27% through November, retreating from its peak gain of 11.7% in August.
As of the end of August 2024, the BioWorld Neurological Diseases Index (BNDI) reported a decline of 8.89%, lagging behind the Nasdaq Biotechnology Index, which gained 11.7%, and the Dow Jones Industrial Average, which rose by 7.05%. While a slight recovery from BNDI’s lowest point this year, in late April when it was down 12.2%, the index had shown modest gains over recent months before slipping again.
In the first five months of 2024, the BioWorld Neurological Diseases Index (BNDI) saw a 10.35% decline, underperforming both the Nasdaq Biotechnology Index (NBI), which rose by 0.7%, and the Dow Jones Industrial Average (DJIA), which increased by 2.64%. This represents an additional drop for BNDI, which closed February with a 4.1% decline. In contrast, in 2023, the BNDI closed with a 4.36% increase, outperforming the NBI, which rose by 3.74%, but not matching the 13.7% rise seen in the DJIA.
In 2023, the BioWorld Neurological Diseases Index (BNDI) closed with a 4.36% increase, outperforming the Nasdaq Biotechnology Index (up 3.74%) but falling short of the surge seen in the Dow Jones Industrial Average (up 13.7%). The rebound marked a significant turnaround from November, when BNDI recorded an 18.37% year-to-date decline.
Clinical data disappointments and third-quarte results cast a shadow on the BioWorld Neurological Diseases Index, closing November with an 18.37% year-to-date decline. This marks a slight improvement from its low point in October, down 23.79%, in contrast to the previous year’s upward trend, which it concluded with an 18.24% increase.
