Real-Time 13F Filing TrackerHedge funds and institutions with $100M+ AUM disclose holdings quarterly

The 13F filing structure

A 13F (specifically the 13F-HR variant for the holdings report) discloses:

• List of holdings — each long equity position by CUSIP, share class, and ticker.
• Number of shares — exact position size in shares.
• Market value — calculated at quarter-end closing price.
• Investment discretion — sole, shared, or none (for managers who run multiple sub-accounts).
• Voting authority — sole, shared, or none.

Note what's missing: entry price (we don't know what the manager paid), cost basis, short positions, options/derivatives, non-US listings, cash holdings, bond holdings. 13F is a deliberately narrow disclosure — long-only US equities at quarter-end.

Which managers are worth tracking

Most active retail traders waste time following too many funds. The signal-to-noise ratio drops rapidly past the top 20 most-followed managers. Useful taxonomy:

Concentrated value managers

• Berkshire Hathaway (Warren Buffett) — 50+ positions but top 10 represent ~85% of portfolio. Long horizons, rare changes. Apple is ~50% of equity portfolio. Watch top-10 rebalances closely.
• Pershing Square (Bill Ackman) — Highly concentrated, 8-12 positions usually. Each is high-conviction. When Ackman exits, it's a signal.
• Greenlight Capital (David Einhorn) — Concentrated long/short. 13F shows only long side.
• ValueAct Capital — Constructive activist with operational focus. Sticky positions.

Activist managers

• Elliott Management (Paul Singer) — Often files 13D activist stakes before they appear in 13F.
• Starboard Value (Jeff Smith) — Operational activist. Watch for board-seat campaigns.
• Third Point (Dan Loeb) — Event-driven with activist tilts.
• Trian Fund (Nelson Peltz) — Constructive activism, longer holds.

Long/short equity (tech-focused)

• Tiger Global — Growth and emerging tech. Position turnover higher than value managers.
• Coatue Management — Tech, similar profile.
• Lone Pine — Tech and growth.
• Whale Rock — Tech specialist.

Quantitative / systematic

• Renaissance Technologies — Medallion is proprietary but RIDA/RIEF show some signal in 13F. Thousands of positions but ranked by conviction signals.
• Two Sigma, AQR Capital, Citadel — Large multi-strategy filings. 13F-only view is partial.

What to skip: multi-strategy mega-funds with 1,000+ positions (the disclosure is too dispersed to signal). Mutual funds (they have specific mandates that drive turnover). Index funds (no signal — they hold what the index demands).

Patterns that signal real conviction

Three reading patterns that work consistently:

1. New 5%+ positions in concentrated managers. When Buffett or Ackman adds a brand-new position that's 5%+ of portfolio, it's a deliberate bet. They've done extensive work. Look at the company's recent 8-K filings and 10-Ks for the thesis context.
2. Consensus buys across multiple managers. If 3-5 top-tier managers all initiate the same position in the same quarter, that's a cluster signal. Often precedes the broader market catching on.
3. Concentrated exits. When a concentrated value manager fully exits a long-held position, they've lost the thesis. The exit signal is sometimes more useful than the buy signal — the manager has done specific work to conclude the original thesis is broken.

Patterns that are noise, not signal

• Position-size rebalances. A manager trimming 10% of their top position is often just risk management, not a change in conviction.
• Small additions to large positions. Berkshire adding 0.1% to its Apple stake means nothing.
• "Closet index" managers. Managers whose 13F looks like the S&P 500 weighted by market cap. Their position changes are flow-driven, not view-driven.

Combining 13F with other SEC filings

The most powerful 13F reads come from combining with other filings on the same name:

• 13D + 13F combo. Activist manager files 13D (5%+ activist stake) → next quarter's 13F shows the position formally + any changes. Confirms whether they've been adding/trimming.
• Insider Form 4 + 13F combo. Insider selling while institutional holders adding = mixed signal but interesting. Insider buying alongside institutional accumulation = consensus.
• 8-K + 13F combo. Company announces strategic catalyst (M&A, restructuring) via 8-K → next quarter's 13F shows which institutions believed the thesis.