ERHC Energy Inc (ERHE)

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you won't be able to come up with a complete list because most stock is held in "street name" by your brokerage. Not all shareholders will be registered with the transfer agent or even hold the stock for any period of time, a day trader could be in and out of the stock every day or once in a blue moon. Stock in market maker hands can be sold again before the transfer is final.
The best you will be able to do is count shareholders the transfer agent knows about and how many street name accounts & estimate a average number of shares per stockholders. The company will have the list of proxies filled & know how many shares that represents.