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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
+6.46%
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
$122B
AUM Growth
+$7.84B
Cap. Flow
-$3.39B
Cap. Flow %
-2.78%
Top 10 Hldgs %
42.57%
Holding
10,535
New
1,474
Increased
3,350
Reduced
3,913
Closed
1,517

Top Buys

Rank Stock Value
1
MSFT icon
Microsoft
MSFT
+$53.9M
2
TLT icon
iShares 20+ Year Treasury Bond ETF
TLT
+$52.9M
3
NVDA icon
NVIDIA
NVDA
+$47.1M
4
PYPL icon
PayPal
PYPL
+$41.7M
5
GOOG icon
Alphabet (Google) Class C
GOOG
+$28.4M

Top Sells

Rank Stock Value
1
AAPL icon
Apple
AAPL
+$51.4M
2
WMT icon
Walmart Inc
WMT
+$46.4M
3
OIH icon
VanEck Oil Services ETF
OIH
+$34.2M
4
ADBE icon
Adobe
ADBE
+$33.5M
5
SBUX icon
Starbucks
SBUX
+$26.8M

Sector Composition

Rank Sector Weight
1 Technology 0.41%
2 Healthcare 0.21%
3 Consumer Discretionary 0.21%
4 Communication Services 0.2%
5 Financials 0.15%
Name Market Value Portfolio Weight Shares or Principal Change
in Stake 		Capital Flow
CODX
9076
PUT
Co-Diagnostics
CODX
$7.74M
– –
-117
Closed -$5K
COGT icon
9077
Cogent Biosciences
COGT
$6.79B
– –
-679
Closed -$7.79K
COLB icon
9078
Columbia Banking Systems
COLB
$9.02B
– –
-143
Closed -$3.02K
COLM icon
9079
CALL
Columbia Sportswear
COLM
$3.19B
– –
-2,800
Closed -$252K
COMP icon
9080
Compass
COMP
$8.27B
– –
-7,739
Closed -$25.4K
COO icon
9081
Cooper Companies
COO
$13.7B
– –
-740
Closed -$69.4K
COOK icon
9082
Traeger
COOK
$170M
– –
-38
Closed -$6.87K
CORT icon
9083
Corcept Therapeutics
CORT
$10.2B
– –
-138
Closed -$3.18K
CPF icon
9084
CALL
Central Pacific Financial
CPF
$1.01B
– –
-300
Closed -$5K
CPSH icon
9085
CPS Technologies
CPSH
$85.6M
– –
-402
Closed -$1.16K
CPT icon
9086
Camden Property Trust
CPT
$11.3B
– –
-888
Closed -$95.7K
CRAI icon
9087
CRA International
CRAI
$1.1B
– –
-193
Closed -$19.4K
CRAI icon
9088
PUT
CRA International
CRAI
$1.1B
– –
-500
Closed -$53K
CRBG icon
9089
Corebridge Financial
CRBG
$14.1B
– –
-62
Closed -$1.03K
CRDF icon
9090
PUT
Cardiff Oncology
CRDF
$64.3M
– –
-2,800
Closed -$4K
CRDL
9091
Cardiol Therapeutics
CRDL
$136M
$0 ﹤0.01%
+839
New +$554
CRESY
9092
CALL
Cresud
CRESY
$794M
– –
-10,408
Closed -$63K
CRGY icon
9093
Crescent Energy
CRGY
$3.72B
– –
-29,007
Closed -$311K
CRUS icon
9094
Cirrus Logic
CRUS
$6.74B
– –
-2,958
Closed -$245K
CSGS
9095
CALL
DELISTED
CSG Systems International
CSGS
– –
-100
Closed -$5K
CSGS
9096
PUT
DELISTED
CSG Systems International
CSGS
– –
-100
Closed -$5K
CSL icon
9097
Carlisle Companies
CSL
$13.6B
– –
-274
Closed -$60.7K
CSR
9098
PUT
Centerspace
CSR
$936M
– –
-100
Closed -$5K
CSWC icon
9099
Capital Southwest
CSWC
$1.46B
– –
-5,616
Closed -$103K
CSTL icon
9100
Castle Biosciences
CSTL
$749M
– –
-3,138
Closed -$63.6K
362 363
364
365 366

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Simplex Trading's Q2 2023 Portfolio in Review

As of Q2 2023, Simplex Trading held 10,535 positions worth $122B, up 6.9% from $114B the previous quarter. Its ten largest holdings account for 43% of the portfolio.

Simplex Trading's Q2 2023 filing shows 1,474 new, 3,350 increased, 3,913 reduced and 1,517 closed positions. Its largest new stake was Microsoft: 171,935 shares worth $58.5M. The largest sale was Apple, an estimated $51.4M.

By sector, the portfolio is most concentrated in Technology at 0.41% of assets, down from 0.42% a quarter earlier, followed by Healthcare and Consumer Discretionary.

  • Simplex Trading's largest Q2 2023 buy was Microsoft: 171,935 shares worth $58.5M.
  • Simplex Trading added most to iShares 20+ Year Treasury Bond ETF in Q2 2023, an estimated $52.9M increase.
  • Simplex Trading's biggest Q2 2023 reduction was Adobe, cutting an estimated $33.5M.
  • Simplex Trading fully exited Apple in Q2 2023, selling an estimated $51.4M.
  • Simplex Trading's ten largest holdings make up 43% of its $122B portfolio in Q2 2023.
  • Simplex Trading opened 1,474 new positions and closed 1,517 in Q2 2023.
  • Simplex Trading's portfolio value rose 6.9% quarter-over-quarter to $122B.

Based on Simplex Trading's 13F filing for Q2 2023, filed 4 Aug 2023.