William Mack & Associates, Inc.
- SEC CIK
- 0002096700
- Latest filing
- Jul 10, 2026
The latest 13F from William Mack & Associates, Inc. covers Q2 2026 (filed Jul 10, 2026): 108 long positions worth $283.7M. The top 10 holdings make up 75.2% of the portfolio, and the largest is Vanguard Scottsdale FDS at 17.0%. Livermore has 7 filings on Form 13F from this institution, going back to Q4 2024.
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.
- New
- 37
- Est. +$14.1M
- Added
- 58
- Est. +$81.5M
- Reduced
- 5
- Est. −$225.7K
- Sold out
- 2
- Est. −$759.6K
Top 5 holdings
Share of this quarter's portfolio value
- Vanguard Scottsdale FDS92206C40917.0%$48.2M
- Vanguard Ftse Developed Markets ETF92194385815.0%$42.5M
- Vanguard Morningstar Mid-Cap ETF92290862914.1%$40.0M
- Dimensional ETF Trust25434V7818.3%$23.6M
- Schwab Fundamental International Equity ETF8085247555.4%$15.3M
Biggest buys
New and added positions, by estimated amount bought
- Vanguard Scottsdale FDS92206C409+$16.8MAdded
- Vanguard Ftse Developed Markets ETF921943858+$15.0MAdded
- Vanguard Morningstar Mid-Cap ETF922908629+$14.5MAddedConverted for a 4-for-1 split
- Dimensional ETF Trust25434V781+$8.67MAdded
- Schwab Fundamental International Equity ETF808524755+$5.83MAdded
Largest weight increases
New and added positions, by percentage points of the portfolio gained
- Vanguard Morningstar Mid-Cap ETF922908629+1.09 pp13.0% → 14.1%
- Schwab U.S. Large-Cap Growth ETF808524300+0.90 pp3.6% → 4.5%
- Vanguard Ftse Developed Markets ETF921943858+0.86 pp14.1% → 15.0%
- Vanguard Morningstar Total Stock Market ETF922908769+0.50 pp0.0% → 0.5%
- Cohen & Steers ETF Trust19249U104+0.38 pp0.5% → 0.9%
Biggest sells
Reduced and sold-out positions, by estimated amount sold
Largest weight decreases
Reduced and sold-out positions, by percentage points of the portfolio lost
Metrics
13F metrics for Q2 2026, computed only from the numbers in the filings. Definitions below.
- Portfolio value
- $283.7M
- +$108.8M (+62.2%) vs. prior quarter
- Positions
- 108
- +35 vs. prior quarter
- Top 10 concentration
- 75.2%
- Top 10 as share of value
- Turnover
- 0.4%
- Q2 2026, one quarter
- Average holding period
- 6.6 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 (Q4 2024), so positions held before then are understated.
13F filings by quarter
7 quarters, going back to Q4 2024. Bars show each quarter's 13F portfolio value; quarters without a filing are left blank.
Peak $283.7M (Q2 2026)
| Quarter | Filed | Positions | Value | Top 3 holdings | Changes | Filing |
|---|---|---|---|---|---|---|
| Q2 2026 | Jul 10, 2026 | 108 | $283.7M | Vanguard Scottsdale FDSVanguard Ftse Developed Markets ETFVanguard Morningstar Mid-Cap ETF | vs. Q1 2026 | SEC |
| Q1 2026 | Apr 14, 2026 | 73 | $174.9M | Vanguard Scottsdale FDSVanguard Ftse Developed Markets ETFVanguard Morningstar Mid-Cap ETF | vs. Q4 2025 | SEC |
| Q4 2025 | Feb 9, 2026 | 92 | $212.5M | Vanguard Scottsdale FDSVanguard Ftse Developed Markets ETFVanguard Morningstar Mid-Cap ETF | vs. Q3 2025 | SEC |
| Q3 2025 | Nov 14, 2025 | 88 | $185.9M | Vanguard Scottsdale FDSVanguard Morningstar Mid-Cap ETFSchwab U.S. Large-Cap Growth ETF | vs. Q2 2025 | SEC |
| Q2 2025 | Nov 24, 2025 | 78 | $157.4M | Vanguard Scottsdale FDSSchwab U.S. Large-Cap Growth ETFVanguard Morningstar Mid-Cap ETF | vs. Q1 2025 | SEC |
| Q1 2025 | Nov 24, 2025 | 70 | $116.8M | Vanguard Scottsdale FDSSchwab U.S. Large-Cap Growth ETFVanguard Morningstar Mid-Cap ETF | vs. Q4 2024 | SEC |
| Q4 2024 | Nov 24, 2025 | 64 | $95.5M | Vanguard Scottsdale FDSSchwab U.S. Large-Cap Growth ETFAAPL | – | SEC |