Two Sigma Investments - Although not publicly traded, it's one of the most well-known quant-driven investment firms. For publicly traded companies, you might look at investment banks and financial services companies that use quantitative strategies, such as:
Goldman Sachs Group Inc. (NYSE: GS)
JPMorgan Chase & Co. (NYSE: JPM)
Renaissance Technologies - Another leading quant firm, also not publicly traded, but its success has influenced many publicly traded financial institutions to adopt quant strategies.
Accounting Firms:
BDO Unibank, Inc. (PSE: BDO) - While primarily a bank, BDO offers accounting and financial services through its subsidiaries.
CBIZ, Inc. (NYSE: CBZ) - Provides professional business services, including accounting, to various companies.
RSM International - While not publicly traded itself, it is a network of accounting firms, some of which might be part of publicly traded entities through their diverse service offerings.