Are shares received through an IPO eligible for margin once they begin trading?

Maintenance Margin is the amount of funds which must be maintained in order to continue holding a position. In the U.S., the rules of the listing exchanges specify the maintenance margin requirements on security transactions subject to SEC approval. The exchange minimum maintenance margin requirement for long stock positions is currently set at 25% although brokers can add any amount of a 'house margin' requirement in excess of that, particularly where the security is considered low-priced or subject to volatile price changes. The exchange minimum maintenance margin requirement for short stock positions is currently set at 30%. You can monitor your margin values in real time using your TWS/Mosaic Account Window. …

Overview

Section 13(f) and Rule 13f-1 of the Securities Exchange Act of 1934 require certain institutional investment managers exercising investment discretion over accounts having an aggregate fair market value of $100 million or more in certain securities specified as “13(f) securities” by the Securities and Exchange Commission (“SEC”) at the end of any trading month to report these holdings to the SEC on Form 13F…

Shares received through a US IPO are not eligible for margin for at least the first 30 days after the shares begin trading in the secondary market…

To subscribe to a HK IPO through Interactive Brokers, you need to satisfy below conditions:

• be at least 18 years old
• hold an individual, joint or institutional account with Interactive Brokers Hong Kong…