Tracking What Bridgewater and Renaissance Are Buying — 13F Filings Decoded

# SEC 13F Watcher
name: 13f-filing-watcher
schedule: "0 */6 * * *"  # Check every 6 hours during filing season
channel: telegram

task: |
  Monitor SEC EDGAR for new 13F filings from tracked funds.

  TRACKED FUNDS:
  - Bridgewater Associates
  - Renaissance Technologies
  - Citadel Advisors
  - Two Sigma Investments
  - DE Shaw & Co
  - Millennium Management
  - Point72 Asset Management
  - Tiger Global Management
  - Pershing Square Capital
  - Appaloosa Management
  - Baupost Group
  - Third Point LLC
  - Elliott Investment Management
  - Viking Global Investors
  - Coatue Management
  - Dragoneer Investment Group
  - Lone Pine Capital
  - Maverick Capital
  - Greenlight Capital
  - Icahn Enterprises

  On new filing:
  1. Parse all positions
  2. Diff vs previous quarter
  3. Categorize: NEW | INCREASED | DECREASED | EXITED
  4. Rank by position size change ($)
  5. Cross-reference with MY holdings
  6. Identify sector rotation themes
  7. Deliver structured alert

async def process_13f_filing(fund_name: str, filing_url: str):
    # Parse the XBRL/XML filing
    current = parse_13f_xml(await fetch(filing_url))
    previous = load_previous_quarter(fund_name)

    # Diff
    changes = {
        "new_positions": [],
        "increased": [],
        "decreased": [],
        "exited": [],
    }

    current_tickers = {h["cusip"]: h for h in current["holdings"]}
    previous_tickers = {h["cusip"]: h for h in previous["holdings"]}

    for cusip, holding in current_tickers.items():
        if cusip not in previous_tickers:
            changes["new_positions"].append(holding)
        elif holding["shares"] > previous_tickers[cusip]["shares"]:
            holding["change_pct"] = (
                (holding["shares"] - previous_tickers[cusip]["shares"])
                / previous_tickers[cusip]["shares"] * 100
            )
            changes["increased"].append(holding)
        elif holding["shares"] < previous_tickers[cusip]["shares"]:
            changes["decreased"].append(holding)

    for cusip in previous_tickers:
        if cusip not in current_tickers:
            changes["exited"].append(previous_tickers[cusip])

    # Cross-reference with my portfolio
    my_holdings = load_my_portfolio()
    overlaps = find_overlaps(changes, my_holdings)

    # Sector analysis
    sectors = analyze_sector_rotation(changes)

    return format_13f_alert(fund_name, changes, overlaps, sectors)

🏦 13F FILING ALERT — Renaissance Technologies
Filed: Mar 11, 2026 (Q4 2025 holdings)

📥 NEW POSITIONS (top 5 by value):
  1. PLTR — 2,100,000 shares ($178M) ⭐ YOU HOLD THIS
  2. COIN — 890,000 shares ($201M)
  3. RKLB — 3,400,000 shares ($95M)
  4. HOOD — 2,800,000 shares ($87M)
  5. AFRM — 1,200,000 shares ($72M)

📈 INCREASED (top 5):
  1. NVDA — +1,800,000 shares (+12%) ⭐ YOU HOLD THIS
  2. GOOGL — +2,400,000 shares (+8%) ⭐ YOU HOLD THIS
  3. MSFT — +900,000 shares (+3%)
  4. AMZN — +1,100,000 shares (+5%)
  5. META — +700,000 shares (+4%)

📉 DECREASED (top 3):
  1. AAPL — -3,200,000 shares (-15%)
  2. JPM — -1,800,000 shares (-20%)
  3. XOM — -2,100,000 shares (-25%)

🚪 EXITED:
  1. INTC — full exit (was 4.2M shares)
  2. T — full exit (was 1.8M shares)

🎯 PORTFOLIO OVERLAP:
  PLTR: Renaissance initiated — confirms your thesis ✅
  NVDA: Increased position — aligned with you ✅
  GOOGL: Increased position — aligned with you ✅
  TSLA: No change — neutral signal

📊 SECTOR ROTATION:
  ▲ Technology (especially AI/data infra)
  ▲ Fintech / Crypto-adjacent
  ▼ Energy, Telecoms, Traditional Banking