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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
CBAT icon
9076
PUT
CBAK Energy Technology Ltd
CBAT
$46.3M
– –
-10,400
Closed -$10K
CBOE icon
9077
Cboe Global Markets
CBOE
$29.8B
– –
-11,803
Closed -$1.48M
CBU icon
9078
CALL
Community Bank
CBU
$3.53B
– –
-2,200
Closed -$138K
CCCC icon
9079
C4 Therapeutics
CCCC
$376M
– –
-44
Closed -$259
CCLD icon
9080
CareCloud
CCLD
$94.3M
– –
-967
Closed -$3.38K
CCU icon
9081
Compañía de Cervecerías Unidas
CCU
$2.12B
$0 ﹤0.01%
+1
New +$15
CDNA icon
9082
CareDx
CDNA
$1.92B
– –
-8,163
Closed -$104K
CDXS icon
9083
CALL
Codexis
CDXS
$135M
– –
-300
Closed -$1K
CECO icon
9084
Ceco Environmental
CECO
$4.42B
– –
-2,850
Closed -$40.3K
CELH icon
9085
Celsius Holdings
CELH
$6.93B
– –
-65,307
Closed -$2.06M
CELU icon
9086
Celularity
CELU
$21.7M
$0 ﹤0.01%
98
-222
-69% -$1.79K
CENX icon
9087
Century Aluminum
CENX
$4.57B
– –
-2,047
Closed -$21.2K
CERT icon
9088
Certara
CERT
$1.17B
– –
-14
Closed -$277
CEVA icon
9089
CEVA Inc
CEVA
$1.01B
– –
-492
Closed -$15.4K
CEVA icon
9090
PUT
CEVA Inc
CEVA
$1.01B
– –
-600
Closed -$15K
CFFN icon
9091
Capitol Federal Financial
CFFN
$1.08B
– –
-5,893
Closed -$47.9K
CFFN icon
9092
PUT
Capitol Federal Financial
CFFN
$1.08B
– –
-10,300
Closed -$89K
CFLT
9093
DELISTED
Confluent
CFLT
– –
-20,529
Closed -$476K
CGBD icon
9094
Carlyle Secured Lending
CGBD
$698M
– –
-2,816
Closed -$41.5K
CHCO icon
9095
City Holding Co
CHCO
$1.97B
– –
-2
Closed –
CHDN icon
9096
CALL
Churchill Downs
CHDN
$6.03B
– –
-1,000
Closed -$105K
CHE icon
9097
Chemed
CHE
$6.78B
– –
-22
Closed -$11.2K
CHGG icon
9098
Chegg
CHGG
$108M
– –
-37,172
Closed -$695K
CHKP icon
9099
Check Point Software Technologies
CHKP
$13.3B
– –
-23,376
Closed -$2.97M
CION icon
9100
CION Investment
CION
$297M
– –
-1,303
Closed -$13.7K
362 363
364
365 366

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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.