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Livermore
Livermore
ZHEN

Blair William & Co

SEC CIK
0000902367
Latest filing
Aug 11, 2026

The latest 13F from Blair William & Co covers Q2 2026 (filed Aug 11, 2026): 1,998 long positions worth $38.4B. The top 10 holdings make up 26.3% of the portfolio, and the largest is Apple Inc. (AAPL) at 4.3%. 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
166
Est. +$304.6M
Added
890
Est. +$1.38B
Reduced
708
Est. −$2.11B
Sold out
90
Est. −$264.6M

Top 5 holdings

Share of this quarter's portfolio value

  1. AAPLApple Inc.
    4.3%$1.66BHistory
  2. AMZNAmazon Com Inc
    3.6%$1.40BHistory
  3. MSFTMicrosoft Corp
    3.3%$1.28BHistory
  4. NVDANVIDIA Corp
    2.8%$1.08BHistory
  5. GOOGAlphabet Inc.
    2.7%$1.04BHistory

Share of portfolio

Top 5 holdings and the other 1,993 positions, by share of portfolio value

  1. AAPL4.3%
  2. AMZN3.6%
  3. MSFT3.3%
  4. NVDA2.8%
  5. GOOG2.7%
  6. Other 1,993 positions83.2%

Biggest buys

New and added positions, by estimated amount bought

  1. HONHoneywell International Inc
    +$101.7MNewHistory
  2. HONAHoneywell Aerospace Inc.
    +$100.4MNewHistory
  3. ANETArista Networks, Inc.
    +$77.0MAddedHistory
  4. Invesco Exchange Traded FD T46137V357
    +$64.2MAdded
  5. Vanguard Morningstar Total Stock Market ETF922908769
    +$57.8MAdded

Largest weight increases

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

  1. ANETArista Networks, Inc.
    +0.31 pp0.4% → 0.7%History
  2. HONHoneywell International Inc
    +0.27 pp0.0% → 0.3%History
  3. HONAHoneywell Aerospace Inc.
    +0.26 pp0.0% → 0.3%History
  4. CRWDCrowdStrike Holdings, Inc.
    +0.26 pp0.3% → 0.5%History
  5. AMDAdvanced Micro Devices Inc
    +0.24 pp0.1% → 0.4%History

Biggest sells

Reduced and sold-out positions, by estimated amount sold

  1. XOMExxonMobil Holdings Corp
    −$160.6MSold outHistory
  2. HONHoneywell International Inc
    −$66.9MSold outHistory
  3. DHRDanaher Corp
    −$62.0MReducedHistory
  4. AAPLApple Inc.
    −$57.7MReducedHistory
  5. MRVLMarvell Technology, Inc.
    −$57.6MReducedHistory

Largest weight decreases

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

  1. XOMExxonMobil Holdings Corp
    −0.46 pp0.5% → 0.0%History
  2. MSFTMicrosoft Corp
    −0.37 pp3.7% → 3.3%History
  3. ICEIntercontinental Exchange, Inc.
    −0.31 pp0.7% → 0.4%History
  4. IDXXIDEXX Laboratories Inc
    −0.26 pp1.5% → 1.3%History
  5. NFLXNetflix Inc
    −0.25 pp0.5% → 0.2%History

Metrics

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

Portfolio value
$38.4B
+$3.49B (+10.0%) vs. prior quarter
Positions
1,998
+76 vs. prior quarter
Top 10 concentration
26.3%
Top 10 as share of value
Turnover
4.6%
Q2 2026, one quarter
Average holding period
20.6 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 $38.4B (Q2 2026)

Q1 2021: $26.5BQ2 2021: $28.9BQ3 2021: $29.4BQ4 2021: $31.9BQ1 2022: $28.5BQ2 2022: $22.5BQ3 2022: $21.8BQ4 2022: $23.0BQ1 2023: $25.0BQ2 2023: $27.3BQ3 2023: $26.1BQ4 2023: $29.3BQ1 2024: $31.8BQ2 2024: $32.4BQ3 2024: $34.1BQ4 2024: $34.4BQ1 2025: $33.2BQ2 2025: $36.0BQ3 2025: $37.6BQ4 2025: $37.3BQ1 2026: $34.9BQ2 2026: $38.4B
Q1 2021Q2 2026
13F filings of Blair William & Co by quarter
QuarterFiledPositionsValueTop 3 holdingsChangesFiling
Q2 2026Aug 11, 20261,998$38.4BAAPLAMZNMSFTvs. Q1 2026SEC
Q1 2026May 8, 20261,922$34.9BAAPLMSFTAMZNvs. Q4 2025SEC
Q4 2025Feb 17, 20261,867$37.3BMSFTAAPLAMZNvs. Q3 2025SEC
Q3 2025Nov 12, 20251,844$37.6BMSFTAAPLAMZNvs. Q2 2025SEC
Q2 2025Jul 24, 20251,824$36.0BMSFTAMZNAAPLvs. Q1 2025SEC
Q1 2025May 9, 20251,801$33.2BMSFTAAPLAMZNvs. Q4 2024SEC
Q4 2024Feb 12, 20251,816$34.4BMSFTAAPLAMZNvs. Q3 2024SEC
Q3 2024Nov 12, 20241,821$34.1BMSFTAAPLAMZNvs. Q2 2024SEC
Q2 2024Aug 12, 20241,822$32.4BMSFTAAPLAMZNvs. Q1 2024SEC
Q1 2024May 9, 20241,787$31.8BMSFTAMZNAAPLvs. Q4 2023SEC
Q4 2023Feb 12, 20241,785$29.3BMSFTAAPLAMZNvs. Q3 2023SEC
Q3 2023Nov 9, 20231,791$26.1BMSFTAAPLAMZNvs. Q2 2023SEC
Q2 2023Aug 11, 20231,809$27.3BMSFTAAPLAMZNvs. Q1 2023SEC
Q1 2023May 12, 20231,801$25.0BAAPLMSFTIDXXvs. Q4 2022SEC
Q4 2022Feb 10, 20231,814$23.0BMSFTAAPLDXCMvs. Q3 2022SEC
Q3 2022Nov 9, 20221,823$21.8BAAPLMSFTAMZNvs. Q2 2022SEC
Q2 2022Aug 10, 20221,863$22.5BMSFTAAPLAMZNvs. Q1 2022SEC
Q1 2022May 13, 20221,910$28.5BAAPLMSFTAMZNvs. Q4 2021SEC
Q4 2021Feb 14, 20221,963$31.9BMSFTAAPLAMZNvs. Q3 2021SEC
Q3 2021Nov 12, 20211,879$29.4BMSFTAAPLAMZNvs. Q2 2021SEC
Q2 2021Aug 12, 20211,888$28.9BMSFTAMZNAAPLvs. Q1 2021SEC
Q1 2021May 13, 20211,856$26.5BMSFTAAPLAMZN–SEC

13D and 13G filings

Companies where Blair William & Co reports owning 5% or more on Schedule 13D or 13G, and its latest filings.

Current stakes of 5% or more

1 company, largest stake first.

Companies where Blair William & Co owns 5% or more
CompanyLatest formStakeChangeFirst filedLatest filingFiling
AIRGAirgain Inc13G/A6.00%716.4K shares–Feb 11, 20215 filingsNov 14, 2025SEC

Latest filings

13 filings on file made by Blair William & Co or listing it as a reporting person, newest first.

Schedule 13D and 13G filings by Blair William & Co
CompanyFiled (ET)FormStakeChangeEvent dateFiling
AIRGAirgain IncNov 14, 20252:43 PM ET13G/A6.00%716.4K shares–Sep 30, 2025SEC
HHSHarte Hanks IncFeb 12, 202413G/AOld format–––SEC
AIRGAirgain IncFeb 12, 202413G/AOld format–––SEC
HHSHarte Hanks IncFeb 10, 202313G/AOld format–––SEC
AIRGAirgain IncFeb 10, 202313G/AOld format–––SEC
OPRXOptimizeRx CorpFeb 11, 202213G/AOld format–––SEC
HHSHarte Hanks IncFeb 11, 202213G/AOld format–––SEC
AIRGAirgain IncFeb 11, 202213G/AOld format–––SEC
Pfenex Inc.Feb 11, 20213:24 PM ET13G/AOld format–––SEC
AIRGAirgain IncFeb 11, 202113G/AOld format–––SEC
GSHDGoosehead Insurance, Inc.Feb 11, 202113G/AOld format–––SEC
OPRXOptimizeRx CorpFeb 11, 202113GOld format–New–SEC
HHSHarte Hanks IncFeb 11, 202113G/AOld format–––SEC