Mainstream Capital Management
Mainstream Capital Management reported 302 stocks worth $170M in its 13F filing for Q3 2026, filed Oct 23, 2026. Its largest holdings are JPST (10.0%), AAPL (6.6%) and GSST (5.6%). Compared with Q2 2026, the fund opened new positions in CRXP, OEF and RAAA, added to GSST, NVDA and META, trimmed JPST, AAPL and AMZN and sold out of UBER and HD.
Holdings
| # | Stock | Value | Weight | Shares | Change | Shares, 8 qtrs | Held |
|---|---|---|---|---|---|---|---|
| 1 |  JPST J P Morgan Exchange Traded F | $16.9M | 10.0% | 336K | −66K (−16%) | 8 of 8 | |
| 2 |  AAPL Apple Inc | $11.2M | 6.6% | 34K | −434 (−1%) | 8 of 8 | |
| 3 |  GSST Goldman Sachs ETF TR | $9.6M | 5.6% | 189K | +1,925 (+1%) | 5 of 8 | |
| 4 |  AMZN Amazon Com Inc | $7.7M | 4.5% | 31K | −232 (−1%) | 8 of 8 | |
| 5 |  NVDA Nvidia Corporation | $7M | 4.1% | 31K | +2,905 (+11%) | 8 of 8 | |
| 6 |  GOOG Alphabet Inc | $6.6M | 3.9% | 20K | −711 (−4%) | 8 of 8 | |
| 7 |  META Meta Platforms Inc | $5.5M | 3.2% | 7,555 | +52 (+1%) | 8 of 8 | |
| 8 |  CRWD Crowdstrike Hldgs Inc | $3.7M | 2.2% | 14K | +11K (+306%) | 8 of 8 | |
| 9 |  MSFT Microsoft Corp | $3.6M | 2.1% | 7,075 | +1,677 (+31%) | 8 of 8 | |
| 10 |  IVV Ishares TR | $3.1M | 1.8% | 4,023 | −317 (−7%) | 8 of 8 |
Positions at Sep 30, 2026, as reported. Change is against the fund's Q2 2026 filing; weight is the share of the fund's reported stocks.
Sold out
held in Q2 2026, gone in Q3 2026
Reported value
last 8 quartersThe value of the US stocks the fund reported, at quarter end prices. It moves with the market as well as with buying and selling.
Filings for Q3 2026
straight from the SEC| Filed | Form | Quarter | |
|---|---|---|---|
| Oct 23, 2026 | 13F-HR | Q3 2026 | SEC filing ↗ |
Other superinvestors
All hedge fund holdings →Mainstream Capital Management 13F FAQ
What does Mainstream Capital Management own?
Mainstream Capital Management reported 302 stocks worth $170M in its 13F filing for Q3 2026, filed Oct 23, 2026. Its largest holdings are JPST (10.0%), AAPL (6.6%) and GSST (5.6%). The table above lists every position in the filing (the top 10 without an account).
What did Mainstream Capital Management buy and sell in Q3 2026?
Compared with Q2 2026: 215 new positions, 25 added to, 52 trimmed and 3 sold out. New positions include CRXP, OEF and RAAA. It sold all of UBER and HD.
When will Mainstream Capital Management file its next 13F?
Holdings as of Dec 31, 2026 are due by Feb 15, 2027. The filing appears on this page within minutes of reaching the SEC.
How much is Mainstream Capital Management's portfolio worth?
The Q3 2026 filing reports $170M in US stocks. That leaves out cash, bonds, short positions and most foreign holdings, so the fund's total assets are usually larger.
For informational and educational purposes only. Not investment advice, and not a recommendation to buy or sell any security. Holdings come from the fund's SEC Form 13F filings as reported and show positions at the end of the quarter, up to 45 days before the filing. The fund may have changed its positions since. A 13F leaves out short positions, cash, bonds and most foreign holdings. See all hedge fund holdings.