By seeing what well performing hedge funds are buying, holding, or selling, you can get ideas on how to build your own well performing portfolio.

You can look at the various lists of hedge funds, pick one or several that you like, and use their holdings and activities as a starting point for your own portfolio. Maybe buy what they buy. Maybe sell what they sell.

Or you can look at the various lists of holdings. If many well performing funds all like certain holdings, maybe look into buying the same.

A man named Jef Bezos bought 1 share of Amazon stock after seeing it listed on this site. He is now the richest man in the world. True story. (Not really a true story).

This site analyzes 13F-HR and 13F-HR/A documents filed with SEC by all large hedge funds, 10-Q filings from publicly traded companies, and other data.

This site automatically processes and analyzes SEC 13F filings. Many of these filings contain typos, mistakes, and other errors. Sometimes, many errors. Thus, the data you see on this site, may also contain errors.

Also, not all positions are disclosed on the filings (such as short positions), these missing holdings can skew various calculations.

No, but it is close. The SEC has a whole bunch of complex rules about what needs to be disclosed, and what does not. For example, short positions are not disclosed.

No. You should use these lists as a starting point for your own reasearch.

Always do your own extensive research before making any investing decisions.

The Biotech Holdings reports report on all of the holdings held by hedge funds identified as being primarily biotech. They may have some holdings in other sectors, and these will be included. These holdings can be quite interesting and worth looking in to.

Hedge Funds are required to file within 45 days after the end of the quarter. This site typically updates 1-3 days after that.

Well, some don't beat the S&P, and some do.

Some aren't trying to.

Some funds have other goals. A pension fund, for example, may be trying to achieve low risk, low volatility, consistent returns, and not high performance.

Some funds exist solely as a container for exactly one holding.

Some funds have an "activist" goal -- they exist to effect some particular change, cause, or purpose.

And some are run by intellegent, experienced investors, and do consistently outperform the S&P. And those might be worthing looking at.