Before tech companies often focus on establishing themselves in the domestic market first rather than going for international patent filing. But this trend somewhat declining especially in the most recent two years.
Below chart shows some of the top filers of PCT in 2018 & 2019:
We also did an analysis of technologies where maximum international patents are being filed and below we have visualised the chart showcasing the top 10 technologies:
Top 10 geographies where the maximum PCT applications were filed with their counts in 2018 & 2019: