Main Street Research LLC

CIK 0001513211 · Q1 2026

13F Equity AUM

$1.7B

-1.7% QoQ

Positions

148

+19 QoQ

AUM Rank

#1,965

Top 16%

Skill Alpha (FF)

-1.1%/yr^ns

No Clear Edge

Rank #3,821 · Top 47%

vs S&P -2.1%/yr (unadj.)

Quarters Tracked

~13 years

Portfolio Concentration

Top 5: 26.6%Top 10: 45.2%Top 20: 72.0%

NVDA6.3%

AAPL6.0%

GOOGL5.2%

ISCF4.8%

TSM4.4%

XBI4.2%

JPM3.8%

AVGO3.8%

MCK3.4%

AMZN3.3%

Others (138)54.8%

HHI (Herfindahl-Hirschman Index) measures portfolio concentration. Low (<1500) = diversified, Moderate (1500-2500), High (>2500) = concentrated bets.

Sector Allocation

Technology37.8%

Financial Services23.8%

Healthcare8.8%

Communication Services8.1%

Consumer Defensive6.6%

Consumer Cyclical4.0%

Energy2.9%

Industrials2.9%

Other5.1%

Portfolio weight by GICS sector based on latest 13F filing. Sectors below 2% are grouped as “Other.”

Position Sizing

Positions: 148Median: 0.04%Avg: 0.68%

0–0.5%

116(7.3%)

0.5–1%

1(0.5%)

1–3%

19(40.8%)

3–5%

9(34.0%)

5%+

3(17.5%)

Count of positions per weight bucket — (%) = combined portfolio weight

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Portfolio Overlap

Shared: 148Unique: 0vs 20 funds

2%Low

148

Fund positions

7,299

Consensus CUSIPs

Jaccard similarity of this fund’s portfolio vs the consensus of top 20 funds by AUM. Low (<15%) = contrarian, Moderate (15-40%), High (>40%) = follows the crowd.

Most Similar Funds

Top 9 benchmark funds with highest portfolio overlap (Jaccard similarity)

BANK OF AMERICA CORP /DE/

3.1%

2.8%

3.6%

4.9%

3.5%

GEODE CAPITAL MANAGEMENT, LLC

3.3%

VANGUARD CAPITAL MANAGEMENT LLC

3.4%

VANGUARD PORTFOLIO MANAGEMENT LLC

Jaccard similarity per fund: shared CUSIPs / (fund A + fund B − shared). Higher values indicate more similar portfolios.

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Position Changes This Quarter

New31Increased75Decreased36Exited12

New Positions

GLW3.1%

+388K

BHP2.2%

+519K

AZN2.2%

+191K

RY2.1%

+223K

KEYS1.9%

+113K

ANET0.3%

+35K

DIS0.1%

+11K

CRUS0.1%

+6K

PHM0.1%

+7K

ON0.0%

+10K

Increased

XBI4.2%

+207K(+57%)

AAPL6.0%

+113K(+39%)

MU2.1%

+104K(+1950%)

ISCF4.8%

+51K(+3%)

WFC0.2%

+27K(+136%)

NVDA6.3%

+25K(+4%)

PANW0.3%

+21K(+157%)

IBIT0.4%

+17K(+9%)

SCHW0.3%

+15K(+46%)

GOOGL5.2%

+14K(+5%)

Decreased

BCS1.1%

-831,866(-49%)

HOOD0.0%

-529,109(-99%)

UBER0.1%

-435,414(-97%)

PLTR1.4%

-272,603(-62%)

V0.2%

-163,842(-94%)

MSFT1.4%

-100,665(-60%)

COST2.7%

-16,227(-26%)

META2.4%

-15,585(-18%)

NFLX0.0%

-7,948(-75%)

BMY0.0%

-7,678(-53%)

Exited

-371,217

-1,022,131

-3,807

-2,361

-3,405

-8,986

-3,762

-848

-6,200

-600

Quarter-over-quarter changes compared to prior 13F filing. New = first appearance; Exited = no longer held.

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Holdings

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