Recently, I’ve been researching how to track the movements of big players and found that the 13F report is a tool really worth understanding in depth.

The 13F is essentially a quarterly holdings report that U.S. institutional investors are required to submit regularly. As long as their asset management scale exceeds $100 million, institutions like hedge funds and trust companies must disclose their holdings of stocks, ETFs, and other long positions within 45 days after the end of each quarter. The benefit of this is to reduce market information asymmetry, allowing ordinary investors to see what large institutions are buying.

What interests me most is that through the 13F report, you can see the true market trends. For example, Berkshire Hathaway, led by Buffett, has an asset scale of $258 billion, and every move they make can influence the market. In Q2 last year, Berkshire held 41 stocks, with Apple still being the absolute main holding, accounting for 22.31%. Interestingly, they also increased their positions in defensive assets like UnitedHealth and construction-related companies, reflecting caution about market uncertainties.

When looking at 13F reports, I found several key points worth paying attention to. First is identifying truly influential institutions—not all institutions are the same. Firms like Bridgewater, Ark Invest, and Soros Fund Management, because of their distinctive investment styles, large scale, or iconic strategies, their holdings changes often signal market trends.

Second is to observe the pattern of stock position changes. When a stock is continuously increased by multiple institutions, or conversely, collectively reduced or completely sold off, these are signals. For example, in Q2 last year, Bridgewater significantly increased its holdings in tech giants (Nvidia, Microsoft, Alphabet) while completely exiting the Chinese market, reflecting a reassessment of geopolitical risks.

My own approach to using 13F reports is this: I don’t focus on data from a single quarter but track the overall institutional holdings changes over multiple quarters. When a stock or industry is consistently increased by multiple institutions for more than two quarters, it indicates the market is genuinely optimistic. This is much more reliable than just looking at a single position change.

However, it’s also important to be aware of the limitations of 13F reports. First is the lag—reports are only published after the quarter ends, so the data is already outdated. Second, 13F only discloses long positions, not short positions or derivatives, so an increase in a stock’s holdings doesn’t necessarily reveal the true intentions of the institution. Lastly, although the SEC requires disclosure, the data itself may have omissions or errors.

Querying 13F reports is actually not difficult. The most direct way is to search on the SEC EDGAR website, but that data requires manual work. I recommend using financial websites like WhaleWisdom or Dataroma, which have already organized the 13F data. Just search for the institution’s name to see the latest holdings details, changes, and so on.

Overall, the core value of 13F reports isn’t “buying according to it will make you money,” but rather helping us understand how big players think and how they adjust their asset allocations. As long as you use the right methods, ordinary investors can also identify market trends and learn institutional investment logic from it.