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Livermore
Livermore
ZHEN

SeaBridge Investment Advisors LLC

SEC CIK
0001304229
Latest filing
Jul 17, 2026

The latest 13F from SeaBridge Investment Advisors LLC covers Q2 2026 (filed Jul 17, 2026): 188 long positions worth $691.6M. The top 10 holdings make up 31.7% of the portfolio, and the largest is Taiwan Semiconductor Manufacturing Co Ltd (TSM) at 4.4%. Livermore has 22 filings on Form 13F from this institution, going back to Q1 2021.

What changed in Q2 2026

Share counts compared with Q1 2026: how many positions were new, added to, reduced or sold out, and the biggest buys and sells. Dollar amounts are estimated at the quarter-end prices implied by the filing.

Full comparison
New
15
Est. +$6.47M
Added
76
Est. +$32.2M
Reduced
57
Est. −$25.5M
Sold out
15
Est. −$6.70M

Top 5 holdings

Share of this quarter's portfolio value

  1. TSMTaiwan Semiconductor Manufacturing Co Ltd
    4.4%$30.3MHistory
  2. AAPLApple Inc.
    3.7%$25.8MHistory
  3. Vanguard Mortgage-Backed Securities ETF92206C771
    3.4%$23.4M
  4. MUMicron Technology Inc
    3.3%$22.7MHistory
  5. GOOGLAlphabet Inc.
    3.3%$22.7MHistory

Share of portfolio

Top 5 holdings and the other 183 positions, by share of portfolio value

  1. TSM4.4%
  2. AAPL3.7%
  3. Vanguard Mortgage-Backed Securities ETF3.4%
  4. MU3.3%
  5. GOOGL3.3%
  6. Other 183 positions81.9%

Biggest buys

New and added positions, by estimated amount bought

  1. LLYEli Lilly & Co
    +$7.35MAddedHistory
  2. iShares Tr464287440
    +$2.43MAdded
  3. Vanguard Mortgage-Backed Securities ETF92206C771
    +$2.24MAdded
  4. SAROStandardAero, Inc.
    +$2.21MAddedHistory
  5. Janus Detroit STR Tr47103U845
    +$2.20MAdded

Largest weight increases

New and added positions, by percentage points of the portfolio gained

  1. MUMicron Technology Inc
    +2.16 pp1.1% → 3.3%History
  2. AMDAdvanced Micro Devices Inc
    +1.37 pp0.9% → 2.3%History
  3. LLYEli Lilly & Co
    +1.07 pp<0.1% → 1.1%History
  4. ASMLASML Holding NV
    +0.39 pp1.2% → 1.6%History
  5. SAROStandardAero, Inc.
    +0.31 pp0.7% → 1.0%History

Biggest sells

Reduced and sold-out positions, by estimated amount sold

  1. iShares Tr464288752
    −$6.45MReduced
  2. STXSeagate Technology Holdings plc
    −$4.63MReducedHistory
  3. VanEck ETF Trust92189F791
    −$3.04MSold out
  4. METAMeta Platforms, Inc.
    −$2.30MReducedHistory
  5. PWRQuanta Services, Inc.
    −$1.97MReducedHistory

Largest weight decreases

Reduced and sold-out positions, by percentage points of the portfolio lost

  1. iShares Tr464288752
    −0.95 pp1.0% → <0.1%
  2. METAMeta Platforms, Inc.
    −0.65 pp2.0% → 1.4%History
  3. VanEck ETF Trust92189F791
    −0.51 pp0.5% → 0.0%
  4. BABAAlibaba Group Holding Ltd
    −0.29 pp0.8% → 0.5%History
  5. SPOTSpotify Technology S.A.
    −0.27 pp1.4% → 1.1%History

Metrics

13F metrics for Q2 2026, computed only from the numbers in the filings. Definitions below.

Portfolio value
$691.6M
+$100.5M (+17.0%) vs. prior quarter
Positions
188
0 vs. prior quarter
Top 10 concentration
31.7%
Top 10 as share of value
Turnover
5.0%
Q2 2026, one quarter
Average holding period
13.4 quarters
Weighted by value

How these are calculated

  • Portfolio value: the market value of all long positions in the 13F, as reported at quarter end, excluding options.
  • Top 10 concentration: the combined value of the 10 largest positions as a share of portfolio value.
  • Turnover: the smaller of this quarter's estimated purchases and estimated sales, divided by the average of this and last quarter's portfolio value. Estimates multiply the change in shares by the quarter-end price implied by the filing (market value divided by shares); new positions use this quarter's value and sold-out positions last quarter's. Only positions reported in shares count, and it is not calculated when the previous quarter was not filed.
  • Average holding period: how many consecutive quarters each current position has been held (including this one; a quarter without the position or without a filing starts the count over), weighted by this quarter's value. Counting starts with the first 13F in Livermore (Q1 2021), so positions held before then are understated.

13F filings by quarter

22 quarters, going back to Q1 2021. Bars show each quarter's 13F portfolio value; quarters without a filing are left blank.

Peak $691.6M (Q2 2026)

Q1 2021: $302.6MQ2 2021: $310.3MQ3 2021: $304.5MQ4 2021: $312.4MQ1 2022: $335.0MQ2 2022: $311.2MQ3 2022: $286.7MQ4 2022: $280.5MQ1 2023: $286.1MQ2 2023: $304.2MQ3 2023: $303.5MQ4 2023: $343.7MQ1 2024: $379.3MQ2 2024: $385.6MQ3 2024: $408.7MQ4 2024: $478.1MQ1 2025: $463.0MQ2 2025: $537.9MQ3 2025: $616.2MQ4 2025: $605.7MQ1 2026: $591.1MQ2 2026: $691.6M
Q1 2021Q2 2026
13F filings of SeaBridge Investment Advisors LLC by quarter
QuarterFiledPositionsValueTop 3 holdingsChangesFiling
Q2 2026Jul 17, 2026188$691.6MTSMAAPLVanguard Mortgage-Backed Securities ETFvs. Q1 2026SEC
Q1 2026Apr 29, 2026188$591.1MAAPLTSMVanguard Mortgage-Backed Securities ETFvs. Q4 2025SEC
Q4 2025Jan 26, 2026196$605.7MAAPLTSMVanguard Mortgage-Backed Securities ETFvs. Q3 2025SEC
Q3 2025Oct 22, 2025203$616.2MiShares TrVanguard Mortgage-Backed Securities ETFAAPLvs. Q2 2025SEC
Q2 2025Jul 17, 2025196$537.9MiShares U.S. Treasury Bond ETFMSFTAAPLvs. Q1 2025SEC
Q1 2025May 2, 2025197$463.0MiShares U.S. Treasury Bond ETFAAPLMSFTvs. Q4 2024SEC
Q4 2024Jan 24, 2025202$478.1MSchwab Intermediate-Term US Treasury ETFAAPLMSFTvs. Q3 2024SEC
Q3 2024Nov 4, 2024150$408.7MAAPLSchwab Intermediate-Term US Treasury ETFMSFTvs. Q2 2024SEC
Q2 2024Aug 1, 2024149$385.6MMSFTAAPLTSMvs. Q1 2024SEC
Q1 2024Apr 30, 2024144$379.3MMSFTiShares U.S. Treasury Bond ETFAAPLvs. Q4 2023SEC
Q4 2023Jan 25, 2024150$343.7MMSFTAAPLiShares U.S. Treasury Bond ETFvs. Q3 2023SEC
Q3 2023Oct 26, 2023133$303.5MVanguard Scottsdale FDSMSFTAAPLvs. Q2 2023SEC
Q2 2023Jul 28, 2023123$304.2MMSFTAAPLVanguard Scottsdale FDSvs. Q1 2023SEC
Q1 2023Apr 28, 2023123$286.1MVanguard Scottsdale FDSMSFTAAPLvs. Q4 2022SEC
Q4 2022Jan 19, 2023124$280.5MVanguard Scottsdale FDSMSFTAAPLvs. Q3 2022SEC
Q3 2022Nov 3, 2022130$286.7MVanguard Scottsdale FDSAAPLMSFTvs. Q2 2022SEC
Q2 2022Jul 29, 2022141$311.2MVanguard Scottsdale FDSiShares TrAAPLvs. Q1 2022SEC
Q1 2022May 9, 2022140$335.0MVanguard Scottsdale FDSAAPLMSFTvs. Q4 2021SEC
Q4 2021Feb 2, 2022136$312.4MAAPLMSFTLOWvs. Q3 2021SEC
Q3 2021Nov 12, 2021130$304.5MAAPLMSFTTSMvs. Q2 2021SEC
Q2 2021Aug 10, 2021130$310.3MAAPLMSFTTSMvs. Q1 2021SEC
Q1 2021May 10, 2021129$302.6MAAPLTSMMSFT–SEC