I understand what you are saying but in merger or
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13F Filings in the U.S.:
Institutional investment managers with over $100 million in assets under management must disclose their holdings quarterly in a Form 13F to the SEC. This means there could be a delay of up to 45 days after the end of the quarter before the public learns of the purchases.
13G or 13D Filings:
When an institution acquires more than 5% of a company’s stock, they must file a 13G or 13D. A 13G is for passive investors and can have up to a 45-day delay, while a 13D must be filed within 10 days of crossing the 5% threshold.