Deep Research

Unlocking Institutional Portfolios

A Strategic Guide to SEC Form 13F for the Long-Term Investor

August 7, 2025Deep Research Analysis

For decades, the investment decisions of the world's most influential financial institutions were largely opaque. In an effort to bring a measure of clarity to the markets, the U.S. government mandated a specific disclosure that provides a quarterly, albeit delayed, glimpse into the portfolios of these major players.

This disclosure, known as Form 13F, has become an indispensable tool for analysts, journalists, and individual investors seeking to understand the positioning of so-called "smart money."

What 13F Reveals

  • • Quarterly equity holdings of major institutions
  • • Position sizes and portfolio concentrations
  • • Changes in conviction over time
  • • Consensus among smart money managers

Critical Limitations

  • • 45-day reporting delay
  • • No short positions disclosed
  • • Missing options details
  • • Confidential treatment requests

The Genesis of Transparency

The requirement for institutional managers to file Form 13F was established in 1975 through amendments to the Securities Exchange Act of 1934. This legislation was a direct response to growing concerns about the increasing influence of institutional investors on financial markets.

The stated purpose was twofold: create a centralized repository for regulators to monitor institutional impact, and increase transparency to bolster public confidence in market integrity.

Who Must File and What They Report

The $100 Million Threshold

Institutional investment managers must file if they exercise investment discretion over accounts holding at least $100 million in Section 13(f) securities on the last trading day of any month.

Covered Securities

Limited to "Section 13(f) securities" including U.S.-listed equities, ETFs, certain options and warrants, and convertible debt securities. Mutual fund shares are excluded.

Filing Timeline

Q1
May 15
Q2
Aug 14
Q3
Nov 14
Q4
Feb 14

How to Find and Use 13F Filings

Step-by-Step: Finding a 13F Filing on EDGAR

  1. Navigate to the SEC's EDGAR Company Search page
  2. Enter the legal name of the investment manager (e.g., "Berkshire Hathaway Inc")
  3. Filter by Filing Type and enter 13F-HR
  4. Click the "Filing" button for the desired quarter
  5. Look for the "Information Table" link for detailed holdings

Best Practices for Using 13F Data

  • Focus on the Right Managers: Track long-term, low-turnover strategies
  • Analyze Changes Over Time: Compare filings over several quarters
  • Prioritize Conviction: Pay attention to top 5-10 holdings
  • Look for Consensus: When multiple respected managers buy the same stock
  • Use for Idea Generation: Always conduct independent research

Critical Limitations You Must Know

The 45-Day Lag

Positions might not be disclosed until over four months after establishment, potentially rendering information obsolete.

Missing Short Positions

Complete absence of short positions is the most critical omission. A long position could be part of a pairs trade.

Confidential Treatment

Managers can request to temporarily omit positions, hiding their most sensitive trades for up to a year.

A Framework for Long-Term Investment Idea Generation

Given the significant limitations of 13F data, its effective use requires a disciplined approach. A prudent long-term investor should use filings as a sophisticated tool for idea generation, not portfolio replication.

What to Look For

  • New Positions: A manager's latest idea
  • Additions: Growing conviction signals
  • Concentration: Top 5-10 positions show highest conviction
  • Consensus: Multiple respected managers buying

The Right Mindset

  • • Use as high-level screening tool
  • • Focus on long-term, value-oriented investors
  • • Treat findings as starting points
  • • Always conduct independent due diligence

Profiling the Masters: Whose Filings Are Most Meaningful?

The utility of 13F analysis depends heavily on the manager being tracked. The most insightful filings come from investors whose strategies are long-term, value-oriented, and concentrated.

WB

Warren Buffett

Berkshire Hathaway

Core Principle:

Buy wonderful businesses at fair prices.

Strategy:

Long-term buy-and-hold.

Portfolio Style:

Concentrated, low turnover, large-cap focused.

13F Utility:

Excellent for identifying high-quality, long-term compounders.

Top Holdings Analysis (Q1 2025)

RankCompanyTickerPortfolio %Shares
1Apple Inc.AAPL25.76%210,000,000
2American Express Co.AXP15.77%151,610,700
3The Coca-Cola Co.KO11.07%267,999,999
4Bank of America Corp.BAC10.19%631,573,531
5Chevron Corp.CVX7.67%118,610,534
SD

Stanley Druckenmiller

Duquesne Family Office

Core Principle:

Make large, concentrated bets on high-conviction macro themes.

Strategy:

Top-down global macro, long/short, flexible asset allocation.

Portfolio Style:

Concentrated, high turnover, macro-driven bets across asset classes.

13F Utility:

Excellent for identifying major macro themes and high-conviction bets.

Top Holdings Analysis (Q1 2025)

RankCompanyTickerPortfolio %Shares
1Natera, Inc.NTRA16.13%3,402,330
2Teva Pharmaceutical IndustriesTEVA7.67%14,879,750
3Coupang, Inc.CPNG6.84%9,302,634
4Woodward, Inc.WWD6.72%1,097,750
5Philip Morris InternationalPM5.88%1,105,268
DT

David Tepper

Appaloosa Management

Core Principle:

Find value in distressed assets when others are fearful.

Strategy:

Contrarian, event-driven, distressed debt and equity.

Portfolio Style:

Concentrated, opportunistic, often in distressed sectors.

13F Utility:

Excellent for spotting contrarian bets in distressed or out-of-favor sectors.

Top Holdings Analysis (Q1 2025)

RankCompanyTickerPortfolio %Shares
1Alibaba Group HoldingBABA21.92%9,230,000
2PDD Holdings Inc.PDD9.29%N/A
3Amazon.com, Inc.AMZN8.58%2,120,950
4JD.com, Inc.JD5.95%6,319,250
5Meta Platforms, Inc.META5.69%N/A
SK

Seth Klarman

The Baupost Group

Core Principle:

Margin of Safety; absolute risk aversion.

Strategy:

Multi-strategy value (equities, distressed debt, real estate).

Portfolio Style:

Diversified across asset types, high cash levels.

13F Utility:

Excellent for finding undervalued, complex situations.

Top Holdings Analysis (Q1 2025)

RankCompanyTickerPortfolio %Shares
1Willis Towers Watson PLCWTW14.81%1,530,000
2Alphabet Inc. (Class C)GOOG9.33%2,080,000
3WESCO International, Inc.WCC8.95%2,010,000
4Liberty Global Ltd. (Class C)LBTYK8.48%24,660,000
5Fidelity National Info ServicesFIS7.49%N/A
BA

Bill Ackman

Pershing Square

Core Principle:

Buy great businesses and fix them.

Strategy:

Concentrated, activist investing.

Portfolio Style:

Extremely concentrated (8-12 stocks), high conviction.

13F Utility:

Excellent for identifying potential activist targets.

Top Holdings Analysis (Q1 2025)

RankCompanyTickerPortfolio %Shares
1Chipotle Mexican Grill, Inc.CMGN/AN/A
2Restaurant Brands InternationalQSRN/AN/A
3Hilton Worldwide HoldingsHLTN/AN/A
4Howard Hughes Holdings Inc.HHHN/AN/A
5Alphabet Inc. (Class A & C)GOOGL/GOOGN/AN/A
MB

Michael Burry

Scion Asset Management

Core Principle:

Identify and bet against market bubbles and inefficiencies.

Strategy:

Deep value, contrarian, macro-focused.

Portfolio Style:

Highly concentrated, high turnover, often contrarian.

13F Utility:

Excellent for spotting contrarian ideas and macro themes.

Top Holdings Analysis (Q1 2025)

RankCompanyTickerPosition TypePortfolio %
1NVIDIA CorporationNVDAPut Option48.96%
2Alibaba Group HoldingBABAPut Option13.27%
3PDD Holdings Inc.PDDPut Option11.88%
4JD.com, Inc.JDPut Option8.26%
5The Estée Lauder CompaniesELCommon Stock6.63%
LL

Li Lu

Himalaya Capital

Core Principle:

Buy high-quality businesses with strong moats to hold long-term.

Strategy:

Long-term, concentrated, Buffett-Munger style.

Portfolio Style:

Extremely concentrated, low turnover, US & Asia focus.

13F Utility:

Excellent for identifying high-quality, long-term compounders.

Top Holdings Analysis (Q1 2025)

RankCompanyTickerPortfolio %Shares
1Bank of America Corp.BAC26.12%13,846,633
2Berkshire Hathaway Inc.BRK.B21.61%897,749
3Alphabet Inc. (Class A)GOOGL17.78%2,543,300
4Alphabet Inc. (Class C)GOOG17.31%2,451,300
5East West Bancorp, Inc.EWBC11.26%2,776,351
MP

Mohnish Pabrai

Dalal Street LLC

Core Principle:

"Heads I win, tails I don't lose much."

Strategy:

Concentrated deep value; "cloning" successful investors.

Portfolio Style:

Extremely concentrated, deep value, often in specific sectors.

13F Utility:

Excellent for finding deep value, contrarian ideas.

Top Holdings Analysis (Q1 2025)

RankCompanyTickerPortfolio %Shares
1Warrior Met Coal Inc.HCC36.57%1,799,580
2Valaris LtdVAL23.87%1,427,564
3Alpha Metallurgical ResourcesAMR22.11%414,616
4Noble Corp PLCNE17.45%1,140,971

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Educational Disclaimer

This analysis is for educational purposes only and should not be considered investment advice. 13F filings have significant limitations and delays. Always conduct your own research and consider consulting with qualified financial professionals before making investment decisions. Past performance of institutional investors does not guarantee future results.