Institutional Manager · CIK 0002096700
William Mack & Associates, Inc.
TROY, MI · File #028-25873
Latest AUM
$212.5M
Positions
92
Top-10 Concentration
80.4%
Filings
5
Portfolio Value Over Time
2025-09
2025-09
2025-09
2025-09
2025-12
Biggest QoQ Changes
Ranked by conviction flow (share change × current price) so mark-to-market moves don't dominate. Price effect column shows how much of the $ change was just the stock moving.
| Action | Issuer | Ticker / CUSIP | Δ Shares | Flow ($) | Price Effect |
|---|---|---|---|---|---|
| ADD | VANGUARD TAX-MANAGED FDS | 921943858 | +131,362 | +$8.2M | +$675,012 |
| ADD | DIMENSIONAL ETF TRUST | 25434V781 | +144,573 | +$5.5M | +$588,191 |
| ADD | VANGUARD SCOTTSDALE FDS | 92206C409 | +65,376 | +$5.2M | -$95,857 |
| ADD | VANGUARD INDEX FDS | 922908629 | +16,263 | +$4.7M | -$233,708 |
| REDUCE | SCHWAB STRATEGIC TR | 808524300 | -130,259 | -$4.2M | +$371,238 |
| ADD | SPDR SERIES TRUST | 78464A359 | +32,553 | +$2.9M | -$193,419 |
| ADD | SCHWAB STRATEGIC TR | 808524755 | +55,517 | +$2.5M | +$273,327 |
| EXITED | VANGUARD CHARLOTTE FDS | 92203J407 | -20,571 | -$1.0M | $0 |
| REDUCE | APPLE INC | AAPL | -2,795 | -$759,841 | +$639,392 |
| REDUCE | MICROSOFT CORP | MSFT | -1,012 | -$489,405 | -$382,878 |
Sector Allocation
Filing History
- 13F HOLDINGS REPORTQ/E Dec 202592 pos · $212.5M
- 13F HOLDINGS REPORTQ/E Sep 202564 pos · $95.5M
- 13F HOLDINGS REPORTQ/E Sep 202570 pos · $116.8M
- 13F HOLDINGS REPORTQ/E Sep 202578 pos · $157.4M
- 13F HOLDINGS REPORTQ/E Sep 202588 pos · $185.9M
Top 20 Holdings — Dec 2025
| # | Issuer | Ticker | Shares | Value | % of Portfolio |
|---|---|---|---|---|---|
| 1 | VANGUARD SCOTTSDALE FDS | 92206C409 | 544,662 | $43.4M | 21.55% |
| 2 | VANGUARD TAX-MANAGED FDS | 921943858 | 396,085 | $24.7M | 12.28% |
| 3 | VANGUARD INDEX FDS | 922908629 | 82,657 | $24.0M | 11.91% |
| 4 | SPDR SERIES TRUST | 78464A359 | 181,336 | $16.2M | 8.03% |
| 5 | DIMENSIONAL ETF TRUST | 25434V781 | 399,201 | $15.2M | 7.53% |
| 6 | SCHWAB STRATEGIC TR | 808524300 | 392,609 | $12.8M | 6.36% |
| 7 | APPLE INC | AAPL | 34,322 | $9.3M | 4.63% |
| 8 | SCHWAB STRATEGIC TR | 808524755 | 176,996 | $8.0M | 3.97% |
| 9 | MICROSOFT CORP | MSFT | 10,134 | $4.9M | 2.43% |
| 10 | VANGUARD MUN BD FDS | 922907746 | 69,081 | $3.5M | 1.72% |
| 11 | VANGUARD INDEX FDS | 922908637 | 9,721 | $3.1M | 1.52% |
| 12 | AMAZON COM INC | AMZN | 10,959 | $2.5M | 1.26% |
| 13 | ALPHABET INC | GOOG | 7,154 | $2.2M | 1.11% |
| 14 | TESLA INC | TSLA | 4,461 | $2.0M | 1.00% |
| 15 | VANGUARD INDEX FDS | 922908363 | 3,054 | $1.9M | 0.95% |
| 16 | VANGUARD INDEX FDS | 922908736 | 3,548 | $1.7M | 0.86% |
| 17 | SCHWAB STRATEGIC TR | 808524409 | 49,985 | $1.5M | 0.73% |
| 18 | VANGUARD BD INDEX FDS | 921937835 | 19,279 | $1.4M | 0.71% |
| 19 | ISHARES TR | 464287507 | 19,491 | $1.3M | 0.64% |
| 20 | VANGUARD INTL EQUITY INDEX F | 922042718 | 8,886 | $1.3M | 0.63% |