As a noun:
* Standard American English: /ʃɛər/ (rhymes with "hair")
* British English: /ʃeə/ (rhymes with "fair")
As a verb:
* Both American and British English: /ʃeər/ (rhymes with "hair")
Examples:
* Noun: I have a share of the company. (pronounced /ʃɛər/ or /ʃeə/)
* Verb: Share your thoughts with the group. (pronounced /ʃeər/)
Note: The pronunciation of "share" is the same in both American and British English when used as a verb.