Ather Energy Pvt. is considering cutting the size of its initial public offering by at least $50 million from an earlier target of about $400 million.The potential smaller size is because the Indian electric-vehicle maker’s existing investors are considering offering fewer shares in the sale.Ather is still planning to go ahead with the IPO in the coming weeks despite the fresh volatility in global stock markets.Considerations are ongoing and details of the offering could change.