You may wish to consider:
Company website, investor relations and annual reports
Most essential components of the annual 10-K filing include:
Use subscribed resources
If you use a subscribed resouce such as Capital IQ you can easily view company docuements all in one place. In CIQ go to the News, Events and Filings section to find Company annual reports and 10ks or look for the link to the 10k at the top of the company profile. More here.
Explore free web sources
Glassdoor website where current and former employees anonymously review companies
Personal networks fellow students or Alumni (Alumni Hub.) You can search for LBS alumni in CIQ.
Google the company. Try using the search string: [organisation name AND company culture], then sift through the results.