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MainStreet Investment Advisors LLC

Registered adviser
Location
CHICAGO, IL
Portfolio Value
Small $734,263,939
Diversification
Diversified
Filing Date
Global Rank
#3,070 / 8,827 ▼ 43
Top Industry
Semiconductors 9.9%
Period ended 4 months ago
Filed Aug 12, 2026 · 3mo
26 quarters · since Mar 2020

Regulatory profile

From Form ADV, the SEC filer profile, 13D/13G type codes and N-CEN, never from the name.

Holder type
Registered adviser
Form ADV roster, Nov 1, 2026
Form ADV adviser
CRD 146615
Roster of Nov 1, 2026
Regulatory AUM
$5,855,906,939
Main clients
Banks and thrifts (100% of AUM)
Private funds on Schedule D 7.B.(1)
As filed Dec 11, 2024; SEC's bulk Form ADV archive ends with 2024 filings.
No private funds listed.
Form ADV history
Monthly rosters from Dec 2019; each row is a run with the same figures, newest first.
Rosters Regulatory AUM Main clients
Apr 2026 to Nov 2026 $5,855,906,939 Banks and thrifts (100%)
Apr 2025 to Mar 2026 $5,409,800,392 Banks and thrifts (100%)
Apr 2024 to Mar 2025 $5,119,845,804 Banks and thrifts (100%)
May 2023 to Mar 2024 $11,202,650,906 Diversified
Apr 2023 $11,202,650,906 Diversified
Apr 2022 to Mar 2023 $9,932,088,506 Diversified
4 earlier changes not shown.

Portfolio style

Measured from the filed 13F common-share book for Jun 30, 2026, never from the firm's own description.

Style
Diversified active
Top 10 weight 50.1%, 17.3 effective positions, active share 59.7% against the S&P 500 as of 2026-06-30; it meets none of the index-like, systematic-like or concentrated tests
Turnover
Low turnover
8.2% over the last four quarters (under 30%)
Horizon
Long horizon
Value-weighted holding period 19.5 quarters (12+), a floor since 59.2% of the book was already held when coverage starts

Closest benchmark: the S&P 500 as of 2026-06-30, active share 59.7%; sector active share 20.1% against the combined 13F book's sector weights.

Over time 26 measured quarters

How the bands are measured

Style bands measure the filed 13F common-share book each closed quarter, tested in this order. Unknown: under $10,000,000 of valued equity or 5 stocks. Index-like (100+ stocks): active share of 20% or less against the closest benchmark, which is the S&P 500, S&P MidCap 400, S&P SmallCap 600, Russell 1000, Russell 2000, Nasdaq-100 or Dow Jones Industrial Average (weighted by an index-tracking fund's reported holdings or the index's constituents nearest the quarter end, over the names resolved to companies, and only when those are 90%+ of its weight) or every 13F filer's combined book, or index series holding 80%+ of the registered fund assets it advises (N-CEN) and equal to 50%+ of its book. Systematic-like: 500+ stocks, 100%+ annual turnover and a top 10 weight of 25% or less. Concentrated: a top 10 weight of 60%+ or 12 or fewer effective positions. Diversified active: none of these. Turnover is the smaller of buys and sells over average equity value, summed over four quarters: low under 30%, high 100%+. Horizon is the value-weighted number of quarters each position has been held: short under 4, long 12+.

Clone Performance

Build a hypothetical price-return history from this filer's public 13F holdings.

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Portfolio Concentration

166 tracked positions · as of Jun 30, 2026 · Δ vs Mar 31, 2026
Top Position
20.6%
+0.9 pts
Top 5
38.4%
+0.0 pts
Top 10
50.1%
+0.1 pts
HHI
577
Sep 2023 → Jun 2026 · range 470 – 697
Diversified+25

Portfolio Trend

26 quarters · across all stocks

Sector Breakdown

As of Jun 30, 2026
Sector % Portfolio Value
Unclassified 31.4% $230,354,012
Technology 20.6% $151,091,624
Financial Services 11.2% $81,919,472
Industrials 9.4% $68,869,147
Healthcare 6.6% $48,541,227
Consumer Cyclical 5.5% $40,023,806
Consumer Defensive 4.9% $36,209,080
Communication Services 4.9% $35,940,090
Energy 2.2% $16,222,858
Utilities 2.2% $15,923,623
Basic Materials 0.6% $4,632,139
Real Estate 0.6% $4,536,861

Last Quarter's Activity

Export CSV
Jun 30, 2026 vs Mar 31, 2026

Added To

Positions the filer increased
25 positions
Ticker Δ Shares Shares Value Open

Trimmed

Positions the filer reduced
25 positions
Ticker Δ Shares Shares Value Open
— −824 6,502 $330,496

New Positions

Positions the filer opened this quarter
12 positions
Ticker Shares Value Open

Sold Out

Positions the filer fully exited
3 positions
Ticker Shares Value Open

Portfolio Positions

Export CSV View 13F filing
166 tracked positions · $734,263,939 total · filing declares 166 positions · $734,263,936 · as of Jun 30, 2026
Showing 1–50 of 166 positions by value · page 1 of 4
Ticker Company Shares Value (USD) % of Portfolio History

Showing the top 50 of 166 positions. Create a free account to see every position, past quarters, search, filters and CSV export.

Covers the securities this platform tracks: U.S.-listed common stock and the put/call positions reported on it. A 13F can also report security types outside that coverage — preferred shares, bonds, warrants, untracked share classes — so the filing's own declared total can exceed the figures above. The source filing is linked at the top of this table.