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Simplex Trading

Simplex Trading Portfolio holdings

AUM $149B
1-Year Est. Return 62.07%
 

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
+8.29%
1 Year Est. Return
+62.07%
3 Year Est. Return
+116.86%
5 Year Est. Return
+116.02%
10 Year Est. Return
+774.44%
AUM
$114B
AUM Growth
+$21.9B
Cap. Flow
+$10.1B
Cap. Flow %
8.87%
Top 10 Hldgs %
37.97%
Holding
10,803
New
1,536
Increased
3,665
Reduced
3,633
Closed
1,729

Top Buys

Rank Stock Value
1
WMT icon
Walmart Inc
WMT
+$43.6M
2
AAPL icon
Apple
AAPL
+$40.9M
3
OIH icon
VanEck Oil Services ETF
OIH
+$37.7M
4
C icon
Citigroup
C
+$34.2M
5
TLT icon
iShares 20+ Year Treasury Bond ETF
TLT
+$32.7M

Top Sells

Rank Stock Value
1
AMZN icon
Amazon
AMZN
+$189M
2
QQQ icon
Invesco QQQ Trust
QQQ
+$123M
3
NVDA icon
NVIDIA
NVDA
+$115M
4
TSLA icon
Tesla
TSLA
+$52M
5
META icon
Meta Platforms (Facebook)
META
+$49M

Sector Composition

Rank Sector Weight
1 Technology 0.42%
2 Consumer Discretionary 0.2%
3 Healthcare 0.17%
4 Industrials 0.15%
5 Communication Services 0.13%
Name Market Value Portfolio Weight Shares or Principal Change
in Stake 		Capital Flow
CISO
9101
CALL
CISO Global
CISO
$11.8M
– –
-127
Closed -$4K
CISO
9102
CISO Global
CISO
$11.8M
$0 ﹤0.01%
101
-1,016
-91% -$16.6K
CISO
9103
PUT
CISO Global
CISO
$11.8M
– –
-1,200
Closed -$45K
CIVI
9104
DELISTED
Civitas Resources
CIVI
– –
-100
Closed -$6.49K
CL icon
9105
Colgate-Palmolive
CL
$72.6B
– –
-144,413
Closed -$10.7M
CLDX icon
9106
Celldex Therapeutics
CLDX
$2.77B
– –
-12,102
Closed -$522K
CLF icon
9107
Cleveland-Cliffs
CLF
$6.81B
– –
-194,142
Closed -$3.84M
CLIR icon
9108
CALL
ClearSign Technologies
CLIR
$22M
– –
-5,320
Closed -$28K
CLPR
9109
CALL
Clipper Realty
CLPR
$46.5M
– –
-3,700
Closed -$23K
CLW icon
9110
CALL
Clearwater Paper
CLW
$271M
– –
-3,200
Closed -$120K
CMBM
9111
DELISTED
Cambium Networks
CMBM
– –
-78
Closed -$1.59K
CMBM
9112
PUT
DELISTED
Cambium Networks
CMBM
– –
-2,400
Closed -$52K
CMC icon
9113
Commercial Metals
CMC
$7.63B
– –
-9,020
Closed -$467K
CMCL icon
9114
CALL
Caledonia Mining Corp
CMCL
$360M
– –
-100
Closed -$1K
CMCM
9115
CALL
Cheetah Mobile
CMCM
$88.8M
– –
-5,700
Closed -$10K
CMCM
9116
PUT
Cheetah Mobile
CMCM
$88.8M
– –
-7,800
Closed -$14K
CMDY icon
9117
iShares Bloomberg Roll Select Commodity Strategy ETF
CMDY
$565M
– –
-26
Closed -$1K
CMP icon
9118
PUT
Compass Minerals
CMP
$1.24B
– –
-100
Closed -$4K
CMPS
9119
Compass Pathways
CMPS
$1.52B
– –
-100
Closed -$921
CNA icon
9120
CNA Financial
CNA
$14.5B
– –
-133
Closed -$5.57K
CNET icon
9121
ZW Data Action Technologies
CNET
$2.91M
– –
-64
Closed –
CNET icon
9122
PUT
ZW Data Action Technologies
CNET
$2.91M
– –
-295
Closed -$14K
CNI icon
9123
Canadian National Railway
CNI
$78.3B
– –
-677
Closed -$80K
CNTA
9124
DELISTED
Centessa Pharmaceuticals
CNTA
– –
-60
Closed –
CNTB
9125
Connect Biopharma Holdings
CNTB
$135M
– –
-994
Closed –
363 364
365
366 367

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Simplex Trading's Q1 2023 Portfolio in Review

As of Q1 2023, Simplex Trading held 10,803 positions worth $114B, up 24% from $91.9B the previous quarter. Its ten largest holdings account for 38% of the portfolio.

Simplex Trading deployed $10.1B of net new capital in Q1 2023, opening 1,536 new positions and adding to 3,665 existing holdings. Its largest new stake was Walmart Inc: 918,957 shares worth $45.2M.

By sector, the portfolio is most concentrated in Technology at 0.42% of assets, up from 0.35% a quarter earlier, followed by Consumer Discretionary and Healthcare.

On the sell side, the largest reduction was Meta Platforms (Facebook), an estimated $49M trimmed.

  • Simplex Trading's largest Q1 2023 buy was Walmart Inc: 918,957 shares worth $45.2M.
  • Simplex Trading added most to Apple in Q1 2023, an estimated $40.9M increase.
  • Simplex Trading's biggest Q1 2023 reduction was Meta Platforms (Facebook), cutting an estimated $49M.
  • Simplex Trading fully exited Amazon in Q1 2023, selling an estimated $189M.
  • Simplex Trading's ten largest holdings make up 38% of its $114B portfolio in Q1 2023.
  • Simplex Trading opened 1,536 new positions and closed 1,729 in Q1 2023.
  • Simplex Trading's portfolio value rose 24% quarter-over-quarter to $114B.

Based on Simplex Trading's 13F filing for Q1 2023, filed 27 Apr 2023.