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Livermore
Livermore
ZHEN

O'Brien Greene & Co. Inc

SEC CIK
0001768635
Latest filing
Aug 6, 2026

The latest 13F from O'Brien Greene & Co. Inc covers Q2 2026 (filed Aug 6, 2026): 141 long positions worth $362.4M. The top 10 holdings make up 38.7% of the portfolio, and the largest is Interactive Brokers Group, Inc. (IBKR) at 5.9%. Livermore has 23 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
16
Est. +$12.5M
Added
34
Est. +$10.1M
Reduced
33
Est. −$10.6M
Sold out
8
Est. −$11.8M

Top 5 holdings

Share of this quarter's portfolio value

  1. IBKRInteractive Brokers Group, Inc.
    5.9%$21.3MHistory
  2. PHYSSprott Physical Gold Trust
    4.9%$17.8MHistory
  3. AAPLApple Inc.
    4.4%$16.0MHistory
  4. BRK.BBerkshire Hathaway Inc
    3.8%$13.9MHistory
  5. Franklin Templeton ETF Tr35473P835
    3.6%$13.1M

Share of portfolio

Top 5 holdings and the other 136 positions, by share of portfolio value

  1. IBKR5.9%
  2. PHYS4.9%
  3. AAPL4.4%
  4. BRK.B3.8%
  5. Franklin Templeton ETF Tr3.6%
  6. Other 136 positions77.3%

Biggest buys

New and added positions, by estimated amount bought

  1. HONAHoneywell Aerospace Inc.
    +$5.78MNewHistory
  2. Constellation Software Inc21037X100
    +$4.62MAdded
  3. WSEWise Group plc
    +$1.73MNewHistory
  4. EVCEntravision Communications Corp
    +$1.04MNewHistory
  5. GLWCorning Inc
    +$873.1KAddedHistory

Largest weight increases

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

  1. HONAHoneywell Aerospace Inc.
    +1.59 pp0.0% → 1.6%History
  2. Constellation Software Inc21037X100
    +1.30 pp0.5% → 1.8%
  3. ABBNYABB Ltd
    +0.76 pp1.9% → 2.7%History
  4. WSEWise Group plc
    +0.48 pp0.0% → 0.5%History
  5. GLWCorning Inc
    +0.30 pp0.1% → 0.4%History

Biggest sells

Reduced and sold-out positions, by estimated amount sold

  1. LYBLyondellBasell Industries N.V.
    −$6.82MSold outHistory
  2. CSCOCisco Systems, Inc.
    −$5.68MReducedHistory
  3. Wise PLC OrdG97229101
    −$2.71MSold out
  4. TLNTalen Energy Corp
    −$730.1KReducedHistory
  5. CFCF Industries Holdings, Inc.
    −$722.4KSold outHistory

Largest weight decreases

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

  1. LYBLyondellBasell Industries N.V.
    −1.93 pp1.9% → 0.0%History
  2. Wise PLC OrdG97229101
    −0.77 pp0.8% → 0.0%
  3. FNVFranco Nevada Corp
    −0.61 pp3.4% → 2.8%History
  4. WMTWalmart Inc.
    −0.42 pp3.6% → 3.2%History
  5. CFCF Industries Holdings, Inc.
    −0.20 pp0.2% → 0.0%History

Metrics

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

Portfolio value
$362.4M
+$9.09M (+2.6%) vs. prior quarter
Positions
141
+8 vs. prior quarter
Top 10 concentration
38.7%
Top 10 as share of value
Turnover
6.3%
Q2 2026, one quarter
Average holding period
16.7 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 $754.7M (Q3 2022)

Q1 2021: $252.4MQ2 2021: $280.1MQ3 2021: $274.1MQ4 2021: $304.4MQ1 2022: $302.9MQ2 2022: $264.8MQ3 2022: $754.7MQ4 2022: $263.7MQ1 2023: $267.0MQ2 2023: $287.7MQ3 2023: $273.4MQ4 2023: $284.4MQ1 2024: $304.1MQ2 2024: $315.8MQ3 2024: $321.1MQ4 2024: $308.0MQ1 2025: $298.1MQ2 2025: $305.7MQ3 2025: $325.2MQ4 2025: $336.8MQ1 2026: $353.3MQ2 2026: $362.4M
Q1 2021Q2 2026
13F filings of O'Brien Greene & Co. Inc by quarter
QuarterFiledPositionsValueTop 3 holdingsChangesFiling
Q2 2026Aug 6, 2026141$362.4MIBKRPHYSAAPLvs. Q1 2026SEC
Q1 2026May 6, 2026133$353.3MPHYSIBKRFranklin Templeton ETF Trvs. Q4 2025SEC
Q4 2025Feb 5, 2026136$336.8MPHYSIBKRAAPLvs. Q3 2025SEC
Q3 2025Nov 10, 2025128$325.2MIBKRPHYSBRK.Bvs. Q2 2025SEC
Q2 2025Aug 6, 2025136$305.7MIBKRBRK.BPHYSvs. Q1 2025SEC
Q1 2025May 12, 2025136$298.1MBRK.BAAPLPHYSvs. Q4 2024SEC
Q4 2024Feb 3, 2025134$308.0MAAPLBRK.BIBKRvs. Q3 2024SEC
Q3 2024Nov 15, 2024136$321.1MBRK.BAAPLIBKRvs. Q2 2024SEC
Q2 2024Aug 12, 2024139$315.8MBRK.BAAPLEOGvs. Q1 2024SEC
Q1 2024May 2, 2024131$304.1MBRK.BEOGAAPLvs. Q4 2023SEC
Q4 2023Feb 2, 2024128$284.4MAAPLBRK.BEOGvs. Q3 2023SEC
Q3 2023Nov 8, 2023128$273.4MBRK.BEOGAAPLvs. Q2 2023SEC
Q2 2023Aug 15, 2023Amended123$287.7MState Street SPDR Bloomberg 1-3 Month T-Bill ETFAAPLBRK.Bvs. Q1 2023SEC
Q1 2023May 3, 2023123$267.0MVLOEOGAAPLvs. Q4 2022SEC
Q4 2022Feb 2, 2023126$263.7MEOGNTRBRK.Bvs. Q3 2022SEC
Q3 2022Nov 9, 2022129$754.7MNTREOGAAPLvs. Q2 2022SEC
Q2 2022Aug 11, 2022131$264.8MNTRAAPLEOGvs. Q1 2022SEC
Q1 2022May 18, 2022132$302.9MNTRAAPLBRK.Bvs. Q4 2021SEC
Q4 2021Feb 8, 2022138$304.4MAAPLDHRNTRvs. Q3 2021SEC
Q3 2021Nov 12, 2021133$274.1MDHRAAPLNTRvs. Q2 2021SEC
Q2 2021Aug 9, 2021136$280.1MAAPLDHRNTRvs. Q1 2021SEC
Q1 2021May 12, 2021128$252.4MDHRAAPLNTR–SEC