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Livermore
Livermore
ZHEN

Stonebrook Private Inc.

SEC CIK
0002008738
Latest filing
Aug 14, 2026

The latest 13F from Stonebrook Private Inc. covers Q2 2026 (filed Aug 14, 2026): 271 long positions worth $547.7M. The top 10 holdings make up 43.8% of the portfolio, and the largest is State Street SPDR Portfolio S&P 500 ETF at 11.3%. Livermore has 12 filings on Form 13F from this institution, going back to Q4 2023.

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
58
Est. +$15.7M
Added
126
Est. +$48.0M
Reduced
82
Est. −$45.9M
Sold out
12
Est. −$3.14M

Top 5 holdings

Share of this quarter's portfolio value

  1. State Street SPDR Portfolio S&P 500 ETF78464A854
    11.3%$61.8M
  2. State Street SPDR Portfolio S&P 500 Growth ETF78464A409
    5.5%$30.0M
  3. BlackRock ETF Trust09290C103
    5.3%$29.1M
  4. State Street SPDR Portfolio S&P 500 Value ETF78464A508
    4.4%$24.1M
  5. AAPLApple Inc.
    3.5%$19.3MHistory

Share of portfolio

Top 5 holdings and the other 266 positions, by share of portfolio value

  1. State Street SPDR Portfolio S&P 500 ETF11.3%
  2. State Street SPDR Portfolio S&P 500 Growth ETF5.5%
  3. BlackRock ETF Trust5.3%
  4. State Street SPDR Portfolio S&P 500 Value ETF4.4%
  5. AAPL3.5%
  6. Other 266 positions70.0%

Biggest buys

New and added positions, by estimated amount bought

  1. State Street SPDR Portfolio S&P 500 ETF78464A854
    +$24.5MAdded
  2. State Street SPDR Portfolio S&P 500 Growth ETF78464A409
    +$6.05MAdded
  3. SPDR Index Shs FDS78463X848
    +$5.26MAdded
  4. Global X FDS37960A529
    +$2.29MAdded
  5. BlackRock ETF Trust09290C590
    +$893.8KNew

Largest weight increases

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

  1. State Street SPDR Portfolio S&P 500 ETF78464A854
    +4.36 pp6.9% → 11.3%
  2. State Street SPDR Portfolio S&P 500 Growth ETF78464A409
    +1.28 pp4.2% → 5.5%
  3. SPDR Index Shs FDS78463X848
    +0.85 pp2.4% → 3.3%
  4. MUMicron Technology Inc
    +0.55 pp0.3% → 0.8%History
  5. AMDAdvanced Micro Devices Inc
    +0.26 pp0.2% → 0.4%History

Biggest sells

Reduced and sold-out positions, by estimated amount sold

  1. iShares MSCI USA Quality Factor ETF46432F339
    −$10.8MReduced
  2. iShares Tr464288877
    −$9.65MReduced
  3. BlackRock ETF Trust09290C806
    −$4.30MReduced
  4. Invesco Exch Traded FD Tr II46138E339
    −$4.02MReduced
  5. iShares Future AI & Tech ETF46435U556
    −$3.77MReduced

Largest weight decreases

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

  1. iShares Tr464288877
    −2.13 pp3.1% → 1.0%
  2. iShares MSCI USA Quality Factor ETF46432F339
    −2.02 pp2.8% → 0.8%
  3. BlackRock ETF Trust09290C806
    −0.74 pp2.1% → 1.3%
  4. State Street SPDR Portfolio S&P 500 Value ETF78464A508
    −0.59 pp5.0% → 4.4%
  5. American Centy ETF Tr025072604
    −0.54 pp1.9% → 1.3%

Metrics

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

Portfolio value
$547.7M
+$78.1M (+16.6%) vs. prior quarter
Positions
271
+46 vs. prior quarter
Top 10 concentration
43.8%
Top 10 as share of value
Turnover
9.6%
Q2 2026, one quarter
Average holding period
8.8 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 (Q4 2023), so positions held before then are understated.

13F filings by quarter

11 quarters, going back to Q4 2023. Bars show each quarter's 13F portfolio value; quarters without a filing are left blank.

Peak $547.7M (Q2 2026)

Q4 2023: $299.4MQ1 2024: $342.8MQ2 2024: $347.8MQ3 2024: $378.1MQ4 2024: $382.1MQ1 2025: $384.6MQ2 2025: $427.4MQ3 2025: $462.9MQ4 2025: $477.7MQ1 2026: $469.6MQ2 2026: $547.7M
Q4 2023Q2 2026
13F filings of Stonebrook Private Inc. by quarter
QuarterFiledPositionsValueTop 3 holdingsChangesFiling
Q2 2026Aug 14, 2026271$547.7MState Street SPDR Portfolio S&P 500 ETFState Street SPDR Portfolio S&P 500 Growth ETFBlackRock ETF Trustvs. Q1 2026SEC
Q1 2026May 11, 2026225$469.6MState Street SPDR Portfolio S&P 500 ETFBlackRock ETF TrustState Street SPDR Portfolio S&P 500 Value ETFvs. Q4 2025SEC
Q4 2025Feb 11, 2026209$477.7MBlackRock ETF TrustState Street SPDR Portfolio S&P 500 ETFState Street SPDR Portfolio S&P 500 Value ETFvs. Q3 2025SEC
Q3 2025Nov 10, 2025208$462.9MAAPLiShares MSCI USA Quality Factor ETFMSFTvs. Q2 2025SEC
Q2 2025Aug 11, 2025197$427.4MiShares TriShares MSCI USA Quality Factor ETFMSFTvs. Q1 2025SEC
Q1 2025Apr 30, 2025188$384.6MiShares MSCI USA Quality Factor ETFAAPLMSFTvs. Q4 2024SEC
Q4 2024Feb 14, 2025182$382.1MiShares MSCI USA Quality Factor ETFAAPLMSFTvs. Q3 2024SEC
Q3 2024Nov 12, 2024179$378.1MiShares MSCI USA Quality Factor ETFAAPLMSFTvs. Q2 2024SEC
Q2 2024Aug 6, 2024176$347.8MiShares MSCI USA Quality Factor ETFMSFTAAPLvs. Q1 2024SEC
Q1 2024May 7, 2024215$342.8MiShares MSCI USA Quality Factor ETFMSFTiShares Trvs. Q4 2023SEC
Q4 2023Feb 13, 2024Amended209$299.4MAAPLiShares MSCI USA Quality Factor ETFMSFT–SEC