Shahab Seyedshahab Tagnavidinani (also known as Shahab Dinani, Sean S. TagnaviDinani, and as Sean Tag), of Irvine, California, a stockbroker registered with Park Avenue Securities LLC, has been fined $5,000.00 and suspended for 45 days from associating with any Financial Industry Regulatory Authority (FINRA) member in any capacity because TagnaviDinani engaged in unauthorized trading. Letter…