William Mack & Associates, Inc.
Long book
$174.9M
Q1 2026
Positions
73
Top-10 weight
77%
concentration
Last quarter
+8.9%
SPY +14.8%
Turnover
24%
of book per quarter
Strategy in plain words
auto-generated from filingsWilliam Mack & Associates, Inc. is a wealth-management firm allocating client money, running a $174.9M US long book across 73 positions.
The portfolio is extremely concentrated — the top 10 positions are almost the whole book. Turnover is modest: positions are typically held for years. Current anchor positions: VANGUARD S/T CORP BOND ETF, VANGUARD FTSE DEVELOPED ETF, VANGUARD MID-CAP ETF, DIMENSIONAL INTERNATIONAL SM, SS SPDR BB CONV SEC ETF.
Over the last 6 quarters its long book ran on average 1.1pp per quarter behind the S&P 500, beating the index in 2 of 6 quarters. Its holdings are mechanical (indexing / client flows), so position changes carry no stock-picking signal.
Implied long-book return vs S&P 500
methodology: positions priced quarterly, no shorts/options Fund long book S&P 500
Q4 2024
-3.7%
Q1 2025
+7.7%
Q2 2025
+7.0%
Q3 2025
+2.3%
Q4 2025
-0.9%
Q1 2026
+8.9%
Sector allocation
Technology 56%
Services media 12%
Industrials 7%
Consumer discretionary 7%
Financials 4%
Energy 4%
Consumer staples 4%
Healthcare 3%
Long book by quarter
What does William Mack own?
Q1 2026 13F| Company | Sector | Shares | Value | % of book | Change |
|---|---|---|---|---|---|
| AAPL APPLE INC | Technology | 30.4K | $7.7M | 4.4% | -11.6% |
| MSFT MICROSOFT CORP | Technology | 9.4K | $3.5M | 2.0% | -7.4% |
| ACN ACCENTURE PLC-CL A | Services media | 11.0K | $2.2M | 1.2% | New |
| GOOGL ALPHABET INC-CL A | Technology | 6.5K | $1.9M | 1.1% | -9.7% |
| TSLA TESLA INC | Industrials | 4.2K | $1.6M | 0.9% | -4.8% |
| AMZN AMAZON.COM INC | Consumer discretionary | 6.2K | $1.3M | 0.7% | -43.5% |
| COKE COCA-COLA CONSOLIDATED INC | Consumer staples | 5.1K | $974K | 0.6% | Held |
| META META PLATFORMS INC-CLASS A | Technology | 1.5K | $871K | 0.5% | -3.4% |
| NVDA NVIDIA CORP | Technology | 4.6K | $805K | 0.5% | -15.1% |
| JPM JPMORGAN CHASE & CO | Financials | 2.5K | $726K | 0.4% | -31.6% |
| NFLX NETFLIX INC | Services media | 6.0K | $576K | 0.3% | +28.1% |
| DTE DTE ENERGY COMPANY | Utilities | 3.4K | $501K | 0.3% | -26.1% |
| T AT&T INC | Communications | 16.0K | $462K | 0.3% | -2.3% |
| SYK STRYKER CORP | Healthcare | 1.4K | $444K | 0.3% | -14.6% |
| GOOG ALPHABET INC-CL C | Technology | 1.5K | $430K | 0.2% | -18.0% |
| XOM EXXON MOBIL CORP | Energy | 2.4K | $415K | 0.2% | -34.3% |
| CVX CHEVRON CORP | Energy | 1.8K | $366K | 0.2% | +0.3% |
| DIS WALT DISNEY CO/THE | Services media | 3.6K | $347K | 0.2% | -33.3% |
| BRK/B BERKSHIRE HATHAWAY INC-CL B | Financials | 719 | $345K | 0.2% | -22.4% |
| F FORD MOTOR CO | Industrials | 28.1K | $324K | 0.2% | -5.3% |
| VRTX VERTEX PHARMACEUTICALS INC | Healthcare | 669 | $299K | 0.2% | -1.9% |
| HD HOME DEPOT INC | Consumer discretionary | 907 | $298K | 0.2% | Held |
| EQT EQT CORP | Energy | 4.0K | $257K | 0.1% | -1.9% |
| COST COSTCO WHOLESALE CORP | Consumer discretionary | 256 | $255K | 0.1% | -1.5% |
| DTM DT MIDSTREAM INC | Utilities | 1.7K | $230K | 0.1% | -26.7% |
| MU MICRON TECHNOLOGY INC | Technology | 675 | $228K | 0.1% | New |
| MA MASTERCARD INC - A | Services media | 450 | $225K | 0.1% | -5.9% |
| CSCO CISCO SYSTEMS INC | Technology | 2.7K | $211K | 0.1% | -10.4% |
13F filing history
| Period | Form | Filed | Entries | Reported value | Flags | Source |
|---|---|---|---|---|---|---|
| Q1 2026 | 13F-HR | Apr 14, 2026 | 73 | $174.9M | canonical | SEC ↗ |
| Q4 2025 | 13F-HR | Feb 9, 2026 | 92 | $212.5M | canonical | SEC ↗ |
| Q3 2025 | 13F-HR | Nov 14, 2025 | 88 | $185.9M | canonical | SEC ↗ |
| Q2 2025 | 13F-HR | Nov 24, 2025 | 78 | $157.4M | canonical | SEC ↗ |
| Q1 2025 | 13F-HR | Nov 24, 2025 | 70 | $116.8M | canonical | SEC ↗ |
| Q4 2024 | 13F-HR | Nov 24, 2025 | 64 | $95.5M | canonical | SEC ↗ |