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JPMorgan's Athena platform is 35M lines of Python. Probably not too relevant here though as it's all Python2 code...

Do you know if BAML Quartz is similar (size and Python 2)?

Any number of resumes on LinkedIn with “Python 2 to 3 migration” will say yes.

Do they maintain all parts of their software stack? Third-party libraries are leaving Python 2 behind (or rather, have largely done so).