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Simplex Trading

Simplex Trading Portfolio holdings

AUM $171B
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

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
SCSC icon
10176
Scansource
SCSC
$1.19B
– –
-35
Closed -$1.53K
SHOE
10177
Shoe Station Group
SHOE
$382M
– –
-97
Closed -$1.66K
SD icon
10178
SandRidge Energy
SD
$531M
– –
-7,066
Closed -$105K
SD icon
10179
PUT
SandRidge Energy
SD
$531M
– –
-2,800
Closed -$45.7K
SDY icon
10180
State Street SPDR S&P Dividend ETF
SDY
$21.8B
– –
-1,639
Closed -$239K
SEE
10181
CALL
DELISTED
Sealed Air
SEE
– –
-85,100
Closed -$3.58M
SEE
10182
DELISTED
Sealed Air
SEE
– –
-1,079
Closed -$45.4K
SEE
10183
PUT
DELISTED
Sealed Air
SEE
– –
-1,300
Closed -$54.7K
SEER icon
10184
CALL
Seer Inc
SEER
$108M
– –
-1,600
Closed -$2.69K
SEM
10185
DELISTED
Select Medical
SEM
– –
-1,642
Closed -$26.7K
SEM
10186
PUT
DELISTED
Select Medical
SEM
– –
-3,900
Closed -$63.5K
SEMR
10187
CALL
DELISTED
Semrush
SEMR
– –
-2,200
Closed -$26.3K
SEMR
10188
DELISTED
Semrush
SEMR
– –
-10,612
Closed -$127K
SEMR
10189
PUT
DELISTED
Semrush
SEMR
– –
-1,000
Closed -$11.9K
SFIX
10190
Stitch Fix
SFIX
$407M
– –
-34,332
Closed -$125K
SFST icon
10191
CALL
Southern First Bancshares
SFST
$603M
– –
-1,000
Closed -$54.5K
SGHT icon
10192
Sight Sciences
SGHT
$460M
– –
-276
Closed -$1.04K
SGHT icon
10193
PUT
Sight Sciences
SGHT
$460M
– –
-400
Closed -$1.51K
SGOL icon
10194
abrdn Physical Gold Shares ETF
SGOL
$7.41B
– –
-3,963
Closed -$170K
SGMT icon
10195
Sagimet Biosciences
SGMT
$680M
– –
-13,636
Closed -$92.7K
SGRY icon
10196
PUT
Surgery Partners
SGRY
$1.87B
– –
-7,700
Closed -$91.8K
SHEN icon
10197
PUT
Shenandoah Telecom
SHEN
$697M
– –
-200
Closed -$3.08K
SHO icon
10198
CALL
Sunstone Hotel Investors
SHO
$2.06B
– –
-100
Closed -$901
SHOO icon
10199
PUT
Steven Madden
SHOO
$3.2B
– –
-16,300
Closed -$553K
SID icon
10200
Companhia Siderúrgica Nacional
SID
$1.62B
– –
-44,613
Closed -$55.8K
406 407
408
409 410

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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.