Main Street Research LLC — 13F Holdings & Portfolio
CIK 1513211 · latest 13F-HR filed 2026-04-30
Main Street Research LLC manages $1.72B in 13F-reported U.S. long-equity assets across 148 reported positions as of its 2026-03-31 13F-HR filing. Its largest disclosed positions are NVDA (6.30%), AAPL (5.96%), GOOGL (5.22%). Quarter over quarter (versus its 2025-12-31 filing) the fund opened 31 new positions, exited 12, added to 52, and trimmed 50.
AUM is the long-equity portion reported on Form 13F-HR. Excludes short positions, cash, foreign holdings, and non-13F assets. For informational purposes only — not investment advice.
$1.72B
Long-equity book
148
Distinct positions
2026-03-31
Filed 2026-04-30
+31 / −12 / ↑52 / ↓50
vs 2025-12-31
| Name | Title / Status | Ownership | Type |
|---|
Top Adds (vs prior quarter)
- MICRON TECHNOLOGY INC$35.3M +2325.3%
- SPDR SERIES TRUST$28.5M +64.9%
- APPLE INC$23.3M +29.5%
- ASML HLDG NV$12.1M +28.3%
- GE VERNOVA INC$12.1M +37.7%
Top Trims
- ROBINHOOD MKTS INC-$60.0M -99.6%
- VISA INC-$58.0M -94.9%
- MICROSOFT CORP-$56.3M -69.3%
- PALANTIR TECHNOLOGIES INC-$53.7M -68.7%
- UBER TECHNOLOGIES INC-$35.7M -97.7%
New Positions
- CORNING INC$52.7M
- BHP BILLITON LIMITED$37.8M
- ASTRAZENECA PLC$37.6M
- ROYAL BK CDA$36.0M
- KEYSIGHT TECHNOLOGIES INC$31.9M
Exited Positions
- ASTRAZENECA PLC$34.1M
- ICICI BANK LIMITED$30.5M
- BOOKING HOLDINGS INC$20.4M
- VANGUARD SPECIALIZED FUNDS$518.9K
- ISHARES TR$506.3K
Rows tagged Call or Put are options positions, not stock. Per SEC Form 13F-HR, Value shows the notional value of the underlying (shares covered × underlying price), not the option premium. Shares is the number of underlying shares covered (divide by 100 for contract count).
| # | Issuer | Symbol | CUSIP | Value | Weight | Shares | Type |
|---|---|---|---|---|---|---|---|
| 1 | NVIDIA CORPORATION | NVDA | 67066G104 | $108.3M | 6.30% | 620,776 | SH |
| 2 | APPLE INC | AAPL | 037833100 | $102.4M | 5.96% | 403,578 | SH |
| 3 | ALPHABET INC | GOOGL | 02079K305 | $89.7M | 5.22% | 311,786 | SH |
| 4 | ISHARES TR | ISCF | 46434V266 | $81.9M | 4.76% | 1,958,627 | SH |
| 5 | TAIWAN SEMICONDUCTOR MANUFAC | TSM | 874039100 | $75.4M | 4.39% | 223,159 | SH |
| 6 | SPDR SERIES TRUST | XBI | 78464A870 | $72.5M | 4.22% | 567,479 | SH |
| 7 | JPMORGAN CHASE & CO | JPM | 46625H100 | $65.8M | 3.83% | 223,762 | SH |
| 8 | BROADCOM INC | AVGO | 11135F101 | $65.7M | 3.83% | 212,402 | SH |
| 9 | MCKESSON CORP | MCK | 58155Q103 | $58.6M | 3.41% | 67,774 | SH |
| 10 | AMAZON COM INC | AMZN | 023135106 | $56.1M | 3.26% | 269,193 | SH |
| 11 | ASML HLDG NV | ASML | N07059210 | $55.1M | 3.20% | 41,687 | SH |
| 12 | CORNING INC | GLW | 219350105 | $52.7M | 3.07% | 387,718 | SH |
| 13 | COSTCO WHOLESALE CORPORATION | COST | 22160K105 | $46.0M | 2.68% | 46,139 | SH |
| 14 | JOHNSON & JOHNSON | JNJ | 478160104 | $45.7M | 2.66% | 186,882 | SH |
| 15 | ISHARES INC | EWY | 464286772 | $44.5M | 2.59% | 361,874 | SH |
| 16 | GE VERNOVA INC | GEV | 36828A101 | $44.2M | 2.57% | 50,692 | SH |
| 17 | WORLD GOLD TR | GLDM | 98149E303 | $43.5M | 2.53% | 469,451 | SH |
| 18 | CATERPILLAR INC | CAT | 149123101 | $43.3M | 2.52% | 61,110 | SH |
| 19 | WALMART INC | WMT | 931142103 | $42.9M | 2.49% | 344,869 | SH |
| 20 | CAMECO CORP | CCJ | 13321L108 | $42.3M | 2.46% | 389,077 | SH |
| 21 | META PLATFORMS INC | META | 30303M102 | $40.6M | 2.36% | 70,962 | SH |
| 22 | AMPHENOL CORP | APH | 032095101 | $38.0M | 2.21% | 301,043 | SH |
| 23 | BHP BILLITON LIMITED | BHP | 088606108 | $37.8M | 2.20% | 519,212 | SH |
| 24 | ASTRAZENECA PLC | AZN | G0593M107 | $37.6M | 2.19% | 190,644 | SH |
| 25 | MICRON TECHNOLOGY INC | MU | 595112103 | $36.9M | 2.14% | 109,109 | SH |
| 26 | ROYAL BK CDA | RY | 780087102 | $36.0M | 2.10% | 222,568 | SH |
| 27 | KEYSIGHT TECHNOLOGIES INC | KEYS | 49338L103 | $31.9M | 1.86% | 112,937 | SH |
| 28 | MICROSOFT CORP | MSFT | 594918104 | $25.0M | 1.45% | 67,542 | SH |
| 29 | PALANTIR TECHNOLOGIES INC | PLTR | 69608A108 | $24.5M | 1.43% | 167,647 | SH |
| 30 | PROCTER & GAMBLE CO | PG | 742718109 | $21.9M | 1.27% | 151,627 | SH |
| 31 | BARCLAYS PLC | BCS | 06738E204 | $18.0M | 1.05% | 850,971 | SH |
| 32 | FAIR ISAAC CORP | FICO | 303250104 | $9.0M | 0.53% | 8,464 | SH |
| 33 | ISHARES BITCOIN TRUST ETF | IBIT | 46438F101 | $7.5M | 0.44% | 196,085 | SH |
| 34 | ALPHABET INC | GOOG | 02079K107 | $6.7M | 0.39% | 23,437 | SH |
| 35 | BERKSHIRE HATHAWAY INC DEL | BRK.B | 084670702 | $5.7M | 0.33% | 11,978 | SH |
| 36 | PALO ALTO NETWORKS INC | PANW | 697435105 | $5.5M | 0.32% | 34,024 | SH |
| 37 | MCDONALDS CORP | MCD | 580135101 | $4.8M | 0.28% | 15,483 | SH |
| 38 | TESLA INC | TSLA | 88160R101 | $4.6M | 0.27% | 12,337 | SH |
| 39 | SCHWAB CHARLES CORP | SCHW | 808513105 | $4.4M | 0.25% | 46,360 | SH |
| 40 | ARISTA NETWORKS INC | ANET | 040413205 | $4.3M | 0.25% | 34,981 | SH |
| 41 | EXXON MOBIL CORP | XOM | 30231G102 | $4.1M | 0.24% | 23,924 | SH |
| 42 | WELLS FARGO & CO | WFC | 949746101 | $3.7M | 0.22% | 46,882 | SH |
| 43 | BERKSHIRE HATHAWAY INC DEL | BRK.A | 084670108 | $3.6M | 0.21% | 5 | SH |
| 44 | CHEVRON CORPORATION | CVX | 166764100 | $3.5M | 0.20% | 16,851 | SH |
| 45 | AUTODESK INC | ADSK | 052769106 | $3.4M | 0.20% | 14,403 | SH |
| 46 | ISHARES TR | IXUS | 46432F834 | $3.3M | 0.19% | 38,583 | SH |
| 47 | VISA INC | V | 92826C839 | $3.1M | 0.18% | 10,246 | SH |
| 48 | ELI LILLY & CO | LLY | 532457108 | $2.7M | 0.16% | 2,908 | SH |
| 49 | ISHARES INC | URTH | 464286392 | $2.7M | 0.15% | 14,742 | SH |
| 50 | ABBVIE INC | ABBV | 00287Y109 | $2.2M | 0.13% | 10,258 | SH |
| Period | Filed | AUM | Holdings | Accession |
|---|---|---|---|---|
| 2026-03-31 | 2026-04-30 | $1.72B | 148 | 0001420506-26-000773 |
| 2025-12-31 | 2026-02-09 | $1.75B | 129 | 0001420506-26-000210 |