We'll this was the results of my own research, through INVESTOPEDIA. Maybe this will help others. Thanks
Securities that cannot be purchased on margin at a particular brokerage or financial institution. Some classes of securities, such as recent initial public offerings (IPOs), over-the-counter bulletin board stocks, and penny stocks, are non-marginable by decree of the Federal Reserve Board. Other securities, such as stocks with share prices under $5 or with extremely high betas, may be excluded at the discretion of the broker itself.
Non-marginable securities must be 100% funded by the investor's own cash, and holdings in non-marginable securities do not add to the investor's margin buying power.