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Simplex Trading

Simplex Trading Portfolio holdings

AUM $171B Turnover 30.09%
1-Year Est. Return 85%
 

Simplex Trading, founded in 2004 and headquartered in Chicago, Illinois, is a technology-driven proprietary trading firm specializing in market-making and liquidity provision, primarily in U.S. equity options and futures options. Leveraging advanced proprietary software and data-driven analysis, the firm optimizes trading strategies and develops innovative solutions to capitalize on financial market opportunities, maintaining a competitive edge through automation and a collaborative team of technologists and traders. With a workforce exceeding 300 and led by CEO Erik Swanson since 2014, Simplex operates with a low-ego, high-intelligence culture, focusing on minimal bureaucracy and rapid execution, while also making strategic venture capital investments in fintech startups. Recognized as a top workplace in Chicago by Built In’s 2025 awards, Simplex continues to evolve, blending cutting-edge technology with a commitment to market efficiency and growth.

This Fund
S&P 500
This Quarter Est. Return
+39.06%
1 Year Est. Return
+85%
3 Year Est. Return
+183.25%
5 Year Est. Return
+145.21%
10 Year Est. Return
+1,056.84%
AUM
$171B
AUM Growth
+$21.5B
Cap. Flow
-$29.5M
Cap. Flow %
-0.02%
Top 10 Hldgs %
49.56%
Holding
10,638
New
1,714
Increased
3,712
Reduced
3,486
Closed
1,487
Avg Time Held Equity + Options
2.9 years
Top 10 Avg Time Held Equity + Options
3.8 years
Top 20 Avg Time Held Equity + Options
4.1 years
Avg Time Held Equity only
0.5 years
Top 10 Avg Time Held Equity only
0.3 years
Top 20 Avg Time Held Equity only
0.3 years

Top Buys

Rank Stock Value
1
IWM icon
iShares Russell 2000 ETF
IWM
+$146M
2
TLT icon
iShares 20+ Year Treasury Bond ETF
TLT
+$108M
3
AAPL icon
Apple
AAPL
+$62.9M
4
TSLA icon
Tesla
TSLA
+$51.9M
5
MU icon
Micron Technology
MU
+$39.5M

Top Sells

Rank Stock Value
1
SPY icon
State Street SPDR S&P 500 ETF Trust
SPY
+$108M
2
META icon
Meta Platforms (Facebook)
META
+$104M
3
AMD icon
Advanced Micro Devices
AMD
+$92.1M
4
AMZN icon
Amazon
AMZN
+$90.3M
5
TSM icon
TSMC
TSM
+$82.9M

Sector Composition

Rank Sector Weight
1 Miscellaneous 98.28%
2 Technology 0.76%
3 Consumer Discretionary 0.21%
4 Communication Services 0.19%
5 Healthcare 0.15%
Name Market Value Portfolio Weight Shares or Principal Change
in Stake 		Capital Flow Held Since
SMIN icon
10226
iShares MSCI India Small-Cap ETF
SMIN
$659M
– –
-80
Closed -$4.8K –
SMP icon
10227
CALL
Standard Motor Products
SMP
$833M
– –
-100
Closed -$3.47K –
SMPL icon
10228
Simply Good Foods
SMPL
$921M
– –
-2,283
Closed -$28.2K –
SMRT icon
10229
SmartRent
SMRT
$238M
– –
-2,352
Closed -$3.53K –
SNA icon
10230
CALL
Snap-on
SNA
$18.5B
– –
-200
Closed -$72.6K –
SNCY icon
10231
CALL
DELISTED
Sun Country Airlines
SNCY
– –
-11,300
Closed -$187K –
SNCY icon
10232
PUT
DELISTED
Sun Country Airlines
SNCY
– –
-100
Closed -$1.65K –
SNOW icon
10233
Snowflake
SNOW
$115B
– –
-21,971
Closed -$4.04M –
SOGP icon
10234
Sound Group
SOGP
$47.3M
– –
-1,943
Closed -$27.4K –
SOHU icon
10235
CALL
Sohu.com
SOHU
$329M
– –
-62,500
Closed -$966K –
SONY icon
10236
Sony
SONY
$152B
– –
-22,364
Closed -$471K –
SOYB icon
10237
Teucrium Soybean Fund
SOYB
$42.2M
– –
-12,599
Closed -$307K –
SPB icon
10238
PUT
Spectrum Brands
SPB
$1.84B
– –
-100
Closed -$7.37K –
SPGM icon
10239
State Street SPDR Portfolio MSCI Global Stock Market ETF
SPGM
$1.79B
– –
-71
Closed -$5.38K –
SPGP icon
10240
Invesco S&P 500 GARP ETF
SPGP
$2.07B
– –
-43
Closed -$4.63K –
SPHR icon
10241
Sphere Entertainment
SPHR
$3.91B
– –
-14,889
Closed -$2.08M –
SPIB icon
10242
State Street SPDR Portfolio Intermediate Term Corporate Bond ETF
SPIB
$11.3B
– –
-1,643
Closed -$55.1K –
SPIR icon
10243
Spire Global
SPIR
$354M
– –
-9,314
Closed -$173K –
SPOK icon
10244
Spok Holdings
SPOK
$215M
– –
-19
Closed -$207 –
SPRU icon
10245
CALL
Spruce Power Holding Corp
SPRU
$25.6M
– –
-200
Closed -$819 –
SPRU icon
10246
Spruce Power Holding Corp
SPRU
$25.6M
– –
-685
Closed -$2.81K –
SPXE icon
10247
ProShares S&P 500 ex-Energy ETF
SPXE
$85.4M
– –
-4
Closed -$277 –
SPXS icon
10248
Direxion Daily S&P 500 Bear 3x ETF
SPXS
$365M
– –
-46,469
Closed -$1.88M –
SR icon
10249
CALL
Spire
SR
$5.04B
– –
-200
Closed -$18.1K –
SRCE icon
10250
CALL
1st Source
SRCE
$2.1B
– –
-3,300
Closed -$228K –
408 409
410
411 412

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Simplex Trading's Q2 2026 Portfolio in Review

As of Q2 2026, Simplex Trading held 10,638 positions worth $171B, up 14% from $149B the previous quarter. Its ten largest holdings account for 50% of the portfolio.

Simplex Trading's Q2 2026 filing shows 1,714 new, 3,712 increased, 3,486 reduced and 1,487 closed positions. Its largest new stake was Micron Technology: 52,682 shares worth $60.8M. The largest sale was State Street SPDR S&P 500 ETF Trust, an estimated $108M.

By sector, the portfolio is most concentrated in Miscellaneous at 98% of assets, down from 98% a quarter earlier, followed by Technology and Consumer Discretionary.

  • Simplex Trading's largest Q2 2026 buy was Micron Technology: 52,682 shares worth $60.8M.
  • Simplex Trading added most to iShares Russell 2000 ETF in Q2 2026, an estimated $146M increase.
  • Simplex Trading's biggest Q2 2026 reduction was State Street SPDR S&P 500 ETF Trust, cutting an estimated $108M.
  • Simplex Trading fully exited Intel in Q2 2026, selling an estimated $76.6M.
  • Simplex Trading's ten largest holdings make up 50% of its $171B portfolio in Q2 2026.
  • Simplex Trading opened 1,714 new positions and closed 1,487 in Q2 2026.
  • Simplex Trading's portfolio value rose 14% quarter-over-quarter to $171B.

Based on Simplex Trading's 13F filing for Q2 2026, filed 12 Aug 2026.