Maseco LLP
- SEC CIK
- 0002074052
- Latest filing
- Aug 5, 2026
The latest 13F from Maseco LLP covers Q2 2026 (filed Aug 5, 2026): 291 long positions worth $3.56B. The top 10 holdings make up 63.9% of the portfolio, and the largest is Dimensional ETF Trust at 17.0%. Livermore has 5 filings on Form 13F from this institution, going back to Q2 2025.
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
- 22
- Est. +$4.79M
- Added
- 109
- Est. +$98.8M
- Reduced
- 70
- Est. −$21.1M
- Sold out
- 122
- Est. −$858.9K
Top 5 holdings
Share of this quarter's portfolio value
- Dimensional ETF Trust25434V40117.0%$603.9M
- Vanguard Scottsdale FDS92206C70611.1%$393.4M
- American Centy ETF Tr0250728858.6%$304.6M
- Dimensional ETF Trust25434V5836.3%$223.7M
- American Centy ETF Tr0250727035.0%$179.2M
Biggest buys
New and added positions, by estimated amount bought
- Dimensional ETF Trust25434V583+$14.0MAdded
- Dimensional U.S. Core Equity 2 ETF25434V708+$11.2MAdded
- Dimensional ETF Trust25434V104+$10.6MAdded
- Vanguard Scottsdale FDS92206C706+$10.6MAdded
- Dimensional ETF Trust25434V799+$8.30MAdded
Largest weight increases
New and added positions, by percentage points of the portfolio gained
- American Centy ETF Tr025072885+0.41 pp8.1% → 8.6%
- Dimensional U.S. Core Equity 2 ETF25434V708+0.37 pp2.6% → 2.9%
- Dimensional ETF Trust25434V104+0.37 pp2.6% → 3.0%
- American Centy ETF Tr025072281+0.25 pp3.0% → 3.3%
- American Centy ETF Tr025072604+0.22 pp2.9% → 3.1%
Biggest sells
Reduced and sold-out positions, by estimated amount sold
- Dimensional ETF Trust25434V401−$9.42MReduced
- iShares Trust iShares 0-1 Year Treasury Bond ETF464288679−$4.41MReduced
- Dimensional ETF Trust25434V724−$1.20MReduced
- iShares Core S&P 500 ETF464287200−$934.2KReduced
- iShares Tr46436E718−$909.8KReduced
Largest weight decreases
Reduced and sold-out positions, by percentage points of the portfolio lost
- iShares Trust iShares 0-1 Year Treasury Bond ETF464288679−0.24 pp1.2% → 0.9%
- Dimensional ETF Trust25434V807−0.16 pp1.7% → 1.5%
- iShares Tr46436E718−0.04 pp0.1% → 0.1%
- METAMeta Platforms, Inc.
- iShares Core S&P 500 ETF464287200−0.02 pp0.3% → 0.3%
Metrics
13F metrics for Q2 2026, computed only from the numbers in the filings. Definitions below.
- Portfolio value
- $3.56B
- +$368.9M (+11.6%) vs. prior quarter
- Positions
- 291
- −100 vs. prior quarter
- Top 10 concentration
- 63.9%
- Top 10 as share of value
- Turnover
- 0.6%
- Q2 2026, one quarter
- Average holding period
- 4.2 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 (Q2 2025), so positions held before then are understated.
13F filings by quarter
5 quarters, going back to Q2 2025. Bars show each quarter's 13F portfolio value; quarters without a filing are left blank.
Peak $3.56B (Q2 2026)
| Quarter | Filed | Positions | Value | Top 3 holdings | Changes | Filing |
|---|---|---|---|---|---|---|
| Q2 2026 | Aug 5, 2026 | 291 | $3.56B | Dimensional ETF TrustVanguard Scottsdale FDSAmerican Centy ETF Tr | vs. Q1 2026 | SEC |
| Q1 2026 | Apr 21, 2026 | 391 | $3.19B | Dimensional ETF TrustVanguard Scottsdale FDSAmerican Centy ETF Tr | vs. Q4 2025 | SEC |
| Q4 2025 | Jan 22, 2026 | 543 | $2.30B | Dimensional ETF TrustVanguard Scottsdale FDSDimensional ETF Trust | vs. Q3 2025 | SEC |
| Q3 2025 | Nov 12, 2025 | 267 | $2.06B | Dimensional ETF TrustVanguard Scottsdale FDSDimensional ETF Trust | vs. Q2 2025 | SEC |
| Q2 2025 | Jul 15, 2025 | 509 | $2.63B | Dimensional ETF TrustVanguard Scottsdale FDSAmerican Centy ETF Tr | – | SEC |