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Livermore
Livermore
ZHEN

S.A. Mason LLC

SEC CIK
0001800911
Latest filing
Jul 31, 2026

The latest 13F from S.A. Mason LLC covers Q2 2026 (filed Jul 31, 2026): 282 long positions worth $325.5M. The top 10 holdings make up 30.2% of the portfolio, and the largest is NVIDIA Corp (NVDA) at 4.9%. 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
29
Est. +$9.52M
Added
118
Est. +$25.2M
Reduced
41
Est. −$3.18M
Sold out
13
Est. −$2.80M

Top 5 holdings

Share of this quarter's portfolio value

  1. NVDANVIDIA Corp
    4.9%$16.1MHistory
  2. Vanguard Mun BD FDS922907696
    3.9%$12.6M
  3. Vanguard S&P 500 ETF922908363
    3.3%$10.8M
  4. Vanguard Morningstar Total Stock Market ETF922908769
    3.2%$10.4M
  5. iShares Core S&P 500 ETF464287200
    3.1%$10.1M

Biggest buys

New and added positions, by estimated amount bought

  1. Vanguard Wellington FD921935870
    +$4.01MAdded
  2. Vanguard Mun BD FDS922907696
    +$3.44MAdded
  3. HNIHni Corp
    +$3.07MNewHistory
  4. Vanguard S&P 500 ETF922908363
    +$2.39MAdded
  5. Vanguard Ftse Developed Markets ETF921943858
    +$1.14MAdded

Largest weight increases

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

  1. HNIHni Corp
    +0.94 pp0.0% → 0.9%History
  2. Vanguard Wellington FD921935870
    +0.87 pp2.0% → 2.9%
  3. Vanguard S&P 500 ETF922908363
    +0.57 pp2.7% → 3.3%
  4. Vanguard Mun BD FDS922907696
    +0.45 pp3.4% → 3.9%
  5. INTCIntel Corp
    +0.37 pp0.2% → 0.6%History

Biggest sells

Reduced and sold-out positions, by estimated amount sold

  1. MUMicron Technology Inc
    −$1.42MReducedHistory
  2. XOMExxonMobil Holdings Corp
    −$1.12MSold outHistory
  3. PAYXPaychex Inc
    −$575.6KReducedHistory
  4. INTUIntuit Inc.
    −$418.4KReducedHistory
  5. FOURShift4 Payments, Inc.
    −$304.0KSold outHistory

Largest weight decreases

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

  1. INTUIntuit Inc.
    −0.55 pp0.8% → 0.3%History
  2. XOMExxonMobil Holdings Corp
    −0.42 pp0.4% → 0.0%History
  3. Vanguard Morningstar Total Stock Market ETF922908769
    −0.22 pp3.4% → 3.2%
  4. PAYXPaychex Inc
    −0.21 pp0.2% → <0.1%History
  5. ACNAccenture plc
    −0.17 pp0.3% → 0.2%History

Metrics

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

Portfolio value
$325.5M
+$59.1M (+22.2%) vs. prior quarter
Positions
282
+16 vs. prior quarter
Top 10 concentration
30.2%
Top 10 as share of value
Turnover
2.0%
Q2 2026, one quarter
Average holding period
17.3 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 $325.5M (Q2 2026)

Q1 2021: $133.9MQ2 2021: $145.4MQ3 2021: $151.9MQ4 2021: $166.1MQ1 2022: $160.3MQ2 2022: $136.9MQ3 2022: $126.4MQ4 2022: $132.8MQ1 2023: $137.7MQ2 2023: $137.7MQ3 2023: $138.7MQ4 2023: $149.1MQ1 2024: $166.4MQ2 2024: $175.9MQ3 2024: $188.6MQ4 2024: $190.4MQ1 2025: $189.3MQ2 2025: $206.7MQ3 2025: $226.6MQ4 2025: $252.9MQ1 2026: $266.4MQ2 2026: $325.5M
Q1 2021Q2 2026
13F filings of S.A. Mason LLC by quarter
QuarterFiledPositionsValueTop 3 holdingsChangesFiling
Q2 2026Jul 31, 2026282$325.5MNVDAVanguard Mun BD FDSVanguard S&P 500 ETFvs. Q1 2026SEC
Q1 2026Apr 27, 2026266$266.4MNVDAVanguard Morningstar Total Stock Market ETFVanguard Mun BD FDSvs. Q4 2025SEC
Q4 2025Jan 29, 2026260$252.9MNVDAVanguard Morningstar Total Stock Market ETFMSFTvs. Q3 2025SEC
Q3 2025Oct 14, 2025256$226.6MNVDAVanguard Morningstar Total Stock Market ETFMSFTvs. Q2 2025SEC
Q2 2025Jul 14, 2025362$206.7MNVDAVanguard Morningstar Total Stock Market ETFMSFTvs. Q1 2025SEC
Q1 2025Apr 23, 2025348$189.3MNVDAVanguard Morningstar Total Stock Market ETFMSFTvs. Q4 2024SEC
Q4 2024Jan 24, 2025342$190.4MNVDAVanguard Morningstar Total Stock Market ETFMSFTvs. Q3 2024SEC
Q3 2024Oct 25, 2024324$188.6MNVDAVanguard Morningstar Total Stock Market ETFMSFTvs. Q2 2024SEC
Q2 2024Jul 10, 2024319$175.9MNVDAMSFTVanguard Morningstar Total Stock Market ETFvs. Q1 2024SEC
Q1 2024Apr 15, 2024314$166.4MNVDAMSFTVanguard Morningstar Total Stock Market ETFvs. Q4 2023SEC
Q4 2023Jan 17, 2024315$149.1MMSFTVanguard Morningstar Total Stock Market ETFSPYvs. Q3 2023SEC
Q3 2023Oct 13, 2023313$138.7MVanguard Morningstar Total Stock Market ETFMSFTSPYvs. Q2 2023SEC
Q2 2023Jul 20, 2023314$137.7MMSFTVanguard Morningstar Total Stock Market ETFiShares Core S&P 500 ETFvs. Q1 2023SEC
Q1 2023May 10, 2023314$137.7MMSFTVanguard Morningstar Total Stock Market ETFiShares Core S&P 500 ETFvs. Q4 2022SEC
Q4 2022Jan 10, 2023313$132.8MVanguard Morningstar Total Stock Market ETFMSFTiShares Core S&P 500 ETFvs. Q3 2022SEC
Q3 2022Oct 20, 2022322$126.4MVanguard Morningstar Total Stock Market ETFMSFTiShares Core S&P 500 ETFvs. Q2 2022SEC
Q2 2022Jul 7, 2022328$136.9MVanguard Morningstar Total Stock Market ETFMSFTiShares Core S&P 500 ETFvs. Q1 2022SEC
Q1 2022May 12, 2022328$160.3MVanguard Morningstar Total Stock Market ETFMSFTiShares Core S&P 500 ETFvs. Q4 2021SEC
Q4 2021Jan 4, 2022324$166.1MVanguard Morningstar Total Stock Market ETFMSFTiShares Core S&P 500 ETFvs. Q3 2021SEC
Q3 2021Oct 12, 2021318$151.9MVanguard Morningstar Total Stock Market ETFMSFTiShares Core S&P 500 ETFvs. Q2 2021SEC
Q2 2021Jul 7, 2021319$145.4MVanguard Morningstar Total Stock Market ETFMSFTSPYvs. Q1 2021SEC
Q1 2021Apr 20, 2021311$133.9MVanguard Morningstar Total Stock Market ETFMSFTSPY–SEC