Managers / Q1 2025 · view latest →
Mainstream Capital Management LLC
CIK 0002043084 · 3435 WILSHIRE BLVD, SUITE 1100, LOS ANGELES, CA, 90010 · 213-365-6773
Summary
Mainstream Capital Management LLC reported $126M in U.S.-listed holdings across 86 positions for Q1 2025.
Its largest position, JPST, represents 15.5% of the portfolio.
Compared with Q4 2024, the fund opened 2 new positions and exited 238.
Portfolio Metrics
Methodology: turnover is min(value bought, value sold) ÷ average reported value across the two quarters — value-based, so market moves inflate it slightly versus a share-based measure. Concentration and largest position are shares of the filing’s total reported value, options excluded, with multiple share classes and repeated sub-manager rows for the same issuer combined into one position — the same rule the holdings table uses by default. New/exited counts compare against the prior filed quarter. All figures derive solely from the fund’s 13F filings.
Reported Value by Quarter
Portfolio Composition
- Common Stock · 56.7% · $72M
- ETP · 41.9% · $53M
- REIT · 0.7% · $918,487
- ADR · 0.7% · $910,668
Quarter-over-Quarter Changes full breakdown →
vs Q4 2024 (amended baseline)
| Issuer | Move | Share Δ | Shares now | Value Δ | Value now |
|---|---|---|---|---|---|
| IBKRINTERACTIVE BROKERS GROUP INC COM CL A | NEW | +4.3K | 4.3K | +$712,203 | $712,203 |
| RIOTRIOT PLATFORMS INC COM | NEW | +18.5K | 18.5K | +$131,948 | $131,948 |
| HDHOME DEPOT INC COM | ADDED | +4.0K | 4.3K | +$1M | $2M |
| LLYELI LILLY & CO COM | ADDED | +1.4K | 1.6K | +$1M | $1M |
| ASAMER SPORTS INC COM SHS | ADDED | +10.1K | 16.9K | +$260,888 | $450,401 |
| PFEPFIZER INC COM | SOLD OUT | −30.5K | 0 | −$808,926 | $0 |
| SPYGSPDR PORTFOLIO S&P 500 GROWTH ETF | SOLD OUT | −6.2K | 0 | −$547,529 | $0 |
| SPDR PORTFOLIO S&P 500 VALUE ETF | SOLD OUT | −6.3K | 0 | −$321,875 | $0 |
Value changes conflate price moves with buying and selling — share changes are the real signal. Share counts are not split-adjusted.
Holdings — Q1 2025
Filing History
| Quarter | Reported Value | Positions | Filed | Type | Links |
|---|---|---|---|---|---|
| Q1 2026 | $149M | 88 | Apr 17, 2026 | 13F-HR | changes · EDGAR ↗ |
| Q4 2025 | $153M | 88 | Jan 21, 2026 | 13F-HR | changes · EDGAR ↗ |
| Q3 2025 | $150M | 87 | Oct 20, 2025 | 13F-HR | changes · EDGAR ↗ |
| Q2 2025 | $138M | 84 | Jul 15, 2025 | 13F-HR | changes · EDGAR ↗ |
| Q1 2025 | $126M | 86 | Apr 28, 2025 | 13F-HR | changes · EDGAR ↗ |
| Q4 2024 | $143M | 322 | Feb 6, 2025 | 13F-HR | changes · EDGAR ↗ |
| Q3 2024 | $118M | 84 | Oct 31, 2024 | 13F-HR | changes · EDGAR ↗ |
13F filings are due up to 45 days after quarter end, so holdings shown here lag the fund’s current book. Source: original SEC filing on EDGAR ↗.