Mariner, LLC

New 13F: Q3 2026

Mariner, LLC filed its 13F for the quarter ended Sep 30, 2026 on Nov 12, 2026: $33.0B in AI and semiconductor stocks; $1.9B bought and $357.8M sold against its previous quarter, at the quarter's prices.

• added to NVIDIA (NVDA): +$235.0M at the quarter's price
• added to Micron (MU): +$186.3M at the quarter's price
• added to Apple (AAPL): +$164.2M at the quarter's price
• added to SpaceX (SPCX): +$145.1M at the quarter's price
• added to Applied Materials (AMAT): +$130.7M at the quarter's price
• trimmed NextEra Energy (NEE): -$98.1M at the quarter's price
• added to Microsoft (MSFT): +$90.6M at the quarter's price
• added to Alphabet (GOOGL): +$81.5M at the quarter's price
• added to Amazon (AMZN): +$77.5M at the quarter's price
• added to Broadcom (AVGO): +$55.2M at the quarter's price

Mariner, LLC declares $29.8B in 170 of the 230 AI and semiconductor companies tracked on Silicon Floor, as of Jun 30, 2026 (Form 13F): 31.3% of its $95.2B 13F portfolio. Largest positions: Apple (0.12% of the company) and NVIDIA (0.11% of the company). It is a private wealth platform: it holds shares for many client accounts, so its trades are left out of the quarter's moves on /holders. Over time: $29.8B in 170 of these companies for Q2 2026, against $1.1B in 54 for Q4 2019 (13F values as filed). From Mar 31, 2026 to Jun 30, 2026, it bought $1.2B and sold $941.1M of these stocks, at the quarter's prices: a net purchase of $272.8M; 15 new positions and 15 sold out.

Performance of its AI picks

The AI-stock portfolio Mariner, LLC declared for Q2 2026 (Form 13F), held unchanged, returned +5.4% in Q3 2026 (SMH -7.1%). Over the last 12 months, quarter after quarter: +27.4% (SMH +87.2%). Over three years, quarter after quarter: +146.9% (SMH +325.8%). Over five years, quarter after quarter: +172.6% (SMH +389.8%). Trades made during a quarter are not visible in 13F filings: this measures its declared picks, not the return of its funds.

Largest positions

1. Apple (AAPL): $5.2B, 18.0M shares, 0.12% of the company, 5.5% of its portfolio (added this quarter); held since Q4 2019 or earlier
2. NVIDIA (NVDA): $5.2B, 26.0M shares, 0.11% of the company, 5.5% of its portfolio (trimmed this quarter); held since Q4 2019 or earlier
3. Alphabet (GOOGL): $2.5B, 7.1M shares, 0.06% of the company, 2.6% of its portfolio (trimmed this quarter); held since Q4 2019 or earlier
4. Microsoft (MSFT): $2.0B, 5.5M shares, 0.07% of the company, 2.1% of its portfolio (trimmed this quarter); held since Q4 2019 or earlier
5. Amazon (AMZN): $1.6B, 6.6M shares, 0.06% of the company, 1.6% of its portfolio (trimmed this quarter); held since Q4 2019 or earlier
6. Broadcom (AVGO): $1.3B, 3.6M shares, 0.07% of the company, 1.4% of its portfolio (added this quarter); held since Q4 2019 or earlier
7. Micron (MU): $1.1B, 945,793 shares, 0.08% of the company, 1.1% of its portfolio (added this quarter); held since Q4 2019 or earlier
8. Meta Platforms (META): $804.9M, 1.4M shares, 0.06% of the company, 0.85% of its portfolio (added this quarter); held since Q4 2019 or earlier
9. Corning (GLW): $732.8M, 2.9M shares, 0.33% of the company, 0.77% of its portfolio (trimmed this quarter); held since Q4 2019 or earlier
10. GE Vernova (GEV): $542.1M, 461,705 shares, 0.17% of the company, 0.57% of its portfolio (trimmed this quarter); held since Q2 2024
11. CrowdStrike (CRWD): $486.1M, 2.5M shares, 0.25% of the company, 0.51% of its portfolio (added this quarter); held since Q4 2021
12. Applied Materials (AMAT): $469.7M, 649,877 shares, 0.08% of the company, 0.49% of its portfolio (added this quarter); held since Q4 2019 or earlier
13. AMD (AMD): $394.2M, 678,695 shares, 0.04% of the company, 0.41% of its portfolio (trimmed this quarter); held since Q4 2019 or earlier
14. Lam Research (LRCX): $383.3M, 884,666 shares, 0.07% of the company, 0.40% of its portfolio (trimmed this quarter); held since Q4 2019 or earlier
15. KLA (KLAC): $378.4M, 1.3M shares, 0.10% of the company, 0.40% of its portfolio (added this quarter); held since Q4 2020

By sector

• Cloud & AI giants: $12.2B, 41% of its AI holdings, 6 companies
• Chips & compute: $8.0B, 27% of its AI holdings, 28 companies
• Power, electrical & cooling: $2.5B, 8% of its AI holdings, 36 companies
• AI software: $2.0B, 7% of its AI holdings, 25 companies
• Equipment & test: $1.5B, 5% of its AI holdings, 20 companies
• Memory & storage: $1.5B, 5% of its AI holdings, 6 companies
• Optics: $858.7M, 3% of its AI holdings, 7 companies
• Interconnect: $599.4M, 2% of its AI holdings, 9 companies
• Servers & systems: $430.9M, 1% of its AI holdings, 11 companies
• Neoclouds & data centers: $278.1M, 1% of its AI holdings, 22 companies

Biggest changes this quarter

• added to Micron (MU): +$489.0M at the quarter's price
• trimmed Corning (GLW): -$177.2M at the quarter's price
• trimmed Microsoft (MSFT): -$118.6M at the quarter's price
• added to Applied Materials (AMAT): +$106.8M at the quarter's price
• added to Cummins (CMI): +$106.6M at the quarter's price
• trimmed GE Vernova (GEV): -$106.2M at the quarter's price
• added to Apple (AAPL): +$93.1M at the quarter's price
• trimmed Alphabet (GOOGL): -$65.3M at the quarter's price
• trimmed NVIDIA (NVDA): -$45.8M at the quarter's price
• trimmed AMD (AMD): -$39.8M at the quarter's price

Other holders of this size

• STATE BOARD OF ADMINISTRATION OF FLORIDA RETIREMENT SYSTEM: $29.8B in 195 of these companies
• PNC Financial Services Group, Inc.: $30.4B in 217 of these companies
• BAMCO INC /NY/: $29.5B in 51 of these companies
• Ensign Peak Advisors, Inc: $30.9B in 184 of these companies
• Gigafund Management Company, LLC: $29.4B in 1 of these companies
• Rafferty Asset Management, LLC: $30.9B in 124 of these companies
• CANADA LIFE ASSURANCE Co: $29.1B in 138 of these companies
• PRUDENTIAL FINANCIAL INC: $31.2B in 190 of these companies

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