Was the Company contribution shares included as income on your W-2?
You cost basis will be the purchase price paid by you, the dividend reinvestment and the amount that company included as income for the 15% contribution shares.
Maintenance fees is not an expense related to selling or purchasing the shares. It is fees related to maintaining your account and hence will not be part of the cost basis unless it is related to selling or purchasing the shares.
Yes, the sale of shares related to the dividend reinvestment in the immediately preceding year will be considered short term capital gain.
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Please note: This advice is provided with the understanding that all the relevant facts have been provided by you. Any change in facts might affect the advice given and hence may not be relied on in such cases. Nothing contained in this reply was intended or written to be used, can be used by any taxpayer, or may be relied upon or used by any taxpayer for the purposes of avoiding penalties that may be imposed on the taxpayer under the Internal Revenue Code of 1986, as amended.