Here are the biggest calls on Wall Street on Friday: HSBC initiates Pfizer as buy HSBC said in its initiation of the multinational biopharma company that it's bullish on Pfizer shares. "With management ambition to outgrow its LOE (loss of exclusivity) phase through 2025-30, the company has acquired ADC platform company Seagen, on a fair value on our calculations. This puts it in a comfortable position where it can show capital discipline for future deals." JPMorgan downgrades AT & T to neutral from overweight JPMorgan downgraded the telecommunications due to "slowing growth drivers." "Based on recent commentary from management lowering…