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Livermore
Livermore
ZHEN

Harbor Advisory Corp

SEC CIK
0001100710
Latest filing
Aug 13, 2026

The latest 13F from Harbor Advisory Corp covers Q2 2026 (filed Aug 13, 2026): 82 long positions worth $373.7M. The top 10 holdings make up 42.5% of the portfolio, and the largest is Vanguard S&P 500 ETF at 5.5%. 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
7
Est. +$3.70M
Added
17
Est. +$12.3M
Reduced
25
Est. −$17.4M
Sold out
4
Est. −$1.24M

Top 5 holdings

Share of this quarter's portfolio value

  1. Vanguard S&P 500 ETF922908363
    5.5%$20.4M
  2. iShares Core S&P Mid-Cap ETF464287507
    4.7%$17.7M
  3. GOOGLAlphabet Inc.
    4.6%$17.0MHistory
  4. Vanguard Intl Equity Index F922042874
    4.2%$15.7M
  5. iShares Core S&P Small Cap ETF464287804
    4.1%$15.4M

Share of portfolio

Top 5 holdings and the other 77 positions, by share of portfolio value

  1. Vanguard S&P 500 ETF5.5%
  2. iShares Core S&P Mid-Cap ETF4.7%
  3. GOOGL4.6%
  4. Vanguard Intl Equity Index F4.2%
  5. iShares Core S&P Small Cap ETF4.1%
  6. Other 77 positions76.9%

Biggest buys

New and added positions, by estimated amount bought

  1. BRK.BBerkshire Hathaway Inc
    +$3.09MAddedHistory
  2. J P Morgan Exchange Traded F46641Q159
    +$2.15MAdded
  3. iShares Core S&P Mid-Cap ETF464287507
    +$1.94MAdded
  4. MUMicron Technology Inc
    +$1.51MNewHistory
  5. iShares Core S&P Small Cap ETF464287804
    +$768.2KAdded

Largest weight increases

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

  1. BRK.BBerkshire Hathaway Inc
    +0.60 pp3.2% → 3.8%History
  2. iShares Core S&P Mid-Cap ETF464287507
    +0.59 pp4.1% → 4.7%
  3. iShares Core S&P Small Cap ETF464287804
    +0.43 pp3.7% → 4.1%
  4. MUMicron Technology Inc
    +0.40 pp0.0% → 0.4%History
  5. J P Morgan Exchange Traded F46641Q159
    +0.18 pp3.6% → 3.8%

Biggest sells

Reduced and sold-out positions, by estimated amount sold

  1. iShares Semiconductor ETF464287523
    −$7.87MReduced
  2. Vanguard S&P 500 ETF922908363
    −$1.87MReduced
  3. GOOGLAlphabet Inc.
    −$1.67MReducedHistory
  4. CSCOCisco Systems, Inc.
    −$1.49MReducedHistory
  5. Vanguard Morningstar Small-Cap ETF922908751
    −$796.0KReduced

Largest weight decreases

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

  1. PFEPfizer Inc
    −0.41 pp1.5% → 1.1%History
  2. Vanguard S&P 500 ETF922908363
    −0.36 pp5.8% → 5.5%
  3. PEPPepsiCo Inc
    −0.30 pp1.2% → 0.9%History
  4. XOMExxonMobil Holdings Corp
    −0.25 pp0.7% → 0.5%History
  5. SPDR Series Trust78468R200
    −0.22 pp1.7% → 1.5%

Metrics

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

Portfolio value
$373.7M
+$40.9M (+12.3%) vs. prior quarter
Positions
82
+3 vs. prior quarter
Top 10 concentration
42.5%
Top 10 as share of value
Turnover
4.5%
Q2 2026, one quarter
Average holding period
19.0 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 $373.7M (Q2 2026)

Q1 2021: $251.6MQ2 2021: $221.8MQ3 2021: $230.5MQ4 2021: $246.5MQ1 2022: $249.2MQ2 2022: $228.2MQ3 2022: $217.1MQ4 2022: $244.8MQ1 2023: $261.9MQ2 2023: $283.3MQ3 2023: $275.9MQ4 2023: $279.3MQ1 2024: $293.8MQ2 2024: $289.5MQ3 2024: $306.4MQ4 2024: $304.4MQ1 2025: $297.9MQ2 2025: $313.8MQ3 2025: $338.2MQ4 2025: $330.6MQ1 2026: $332.8MQ2 2026: $373.7M
Q1 2021Q2 2026
13F filings of Harbor Advisory Corp by quarter
QuarterFiledPositionsValueTop 3 holdingsChangesFiling
Q2 2026Aug 13, 202682$373.7MVanguard S&P 500 ETFiShares Core S&P Mid-Cap ETFGOOGLvs. Q1 2026SEC
Q1 2026May 7, 202679$332.8MVanguard S&P 500 ETFGOOGLFirst Tr Exchange-Traded FDvs. Q4 2025SEC
Q4 2025Feb 6, 202678$330.6MVanguard S&P 500 ETFGOOGLFirst Tr Exchange-Traded FDvs. Q3 2025SEC
Q3 2025Nov 12, 202580$338.2MVanguard S&P 500 ETFGOOGLAMZNvs. Q2 2025SEC
Q2 2025Aug 12, 202581$313.8MVanguard S&P 500 ETFAMZNFirst Tr Exchange-Traded FDvs. Q1 2025SEC
Q1 2025May 13, 202583$297.9MVanguard S&P 500 ETFBRK.BAMZNvs. Q4 2024SEC
Q4 2024Jan 29, 202586$304.4MVanguard S&P 500 ETFGOOGLAAPLvs. Q3 2024SEC
Q3 2024Oct 21, 202490$306.4MVanguard S&P 500 ETFAAPLVanguard Intl Equity Index Fvs. Q2 2024SEC
Q2 2024Jul 25, 202484$289.5MVanguard S&P 500 ETFGOOGLVanguard Intl Equity Index Fvs. Q1 2024SEC
Q1 2024Apr 29, 202486$293.8MVanguard S&P 500 ETFVanguard Intl Equity Index FBRK.Bvs. Q4 2023SEC
Q4 2023Feb 5, 202484$279.3MVanguard S&P 500 ETFVanguard Intl Equity Index FAAPLvs. Q3 2023SEC
Q3 2023Oct 27, 202386$275.9MVanguard S&P 500 ETFAAPLGOOGLvs. Q2 2023SEC
Q2 2023Aug 3, 202384$283.3MVanguard S&P 500 ETFAAPLVanguard Intl Equity Index Fvs. Q1 2023SEC
Q1 2023May 4, 202379$261.9MVanguard S&P 500 ETFAAPLVanguard Intl Equity Index Fvs. Q4 2022SEC
Q4 2022Feb 7, 202377$244.8MVanguard S&P 500 ETFBRK.BSPDR Series Trustvs. Q3 2022SEC
Q3 2022Oct 31, 202273$217.1MSPDR Series TrustBIPAAPLvs. Q2 2022SEC
Q2 2022Aug 1, 202276$228.2MBIPSPDR Series TrustAAPLvs. Q1 2022SEC
Q1 2022May 13, 202280$249.2MAAPLGOOGLVanguard Intl Equity Index Fvs. Q4 2021SEC
Q4 2021Feb 7, 202281$246.5MGOOGLAAPLVanguard Intl Equity Index Fvs. Q3 2021SEC
Q3 2021Nov 12, 202180$230.5MGOOGLState Street SPDR Bloomberg Emerging Markets Local Bond ETFSPDR Series Trustvs. Q2 2021SEC
Q2 2021Aug 4, 202174$221.8MSPDR Series TrustState Street SPDR Bloomberg Emerging Markets Local Bond ETFVanguard Ftse Emerging Markets ETFvs. Q1 2021SEC
Q1 2021May 13, 202198$251.6MSPDR Series TrustState Street SPDR Bloomberg Emerging Markets Local Bond ETFVanguard Ftse Emerging Markets ETF–SEC