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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
ALL icon
8901
Allstate
ALL
$66.9B
– –
-1,127
Closed -$142K
ALRS icon
8902
Alerus Financial
ALRS
$822M
– –
-100
Closed -$2K
ALT icon
8903
Altimmune
ALT
$539M
– –
-226,629
Closed -$2.69M
ALXO icon
8904
ALX Oncology
ALXO
$273M
– –
-57
Closed -$432
AMAL icon
8905
CALL
Amalgamated Financial
AMAL
$1.48B
– –
-4,200
Closed -$96K
AME icon
8906
Ametek
AME
$55.5B
– –
-1,206
Closed -$171K
AMED
8907
DELISTED
Amedisys
AMED
– –
-1,296
Closed -$112K
AMG icon
8908
Affiliated Managers Group
AMG
$9.46B
– –
-135
Closed -$21.3K
AMLX icon
8909
Amylyx Pharmaceuticals
AMLX
$2.05B
– –
-24,248
Closed -$842K
AMPH icon
8910
Amphastar Pharmaceuticals
AMPH
$825M
– –
-279
Closed -$9.15K
AMRX icon
8911
Amneal Pharmaceuticals
AMRX
$5.72B
$0 ﹤0.01%
+485
New +$966
AMRC icon
8912
Ameresco
AMRC
$1.15B
– –
-317
Closed -$16.8K
AMZA icon
8913
InfraCap MLP ETF
AMZA
$471M
– –
-281
Closed -$9.18K
AMZN icon
8914
Amazon
AMZN
$2.5T
– –
-1,956,696
Closed -$189M
ANAB icon
8915
CALL
AnaptysBio
ANAB
$1.6B
– –
-200
Closed -$6K
ANAB icon
8916
AnaptysBio
ANAB
$1.6B
– –
-29
Closed –
ANAB icon
8917
PUT
AnaptysBio
ANAB
$1.6B
– –
-700
Closed -$21K
ANGL icon
8918
VanEck Fallen Angel High Yield Bond ETF
ANGL
$3.07B
– –
-17,429
Closed -$470K
ANGO icon
8919
AngioDynamics
ANGO
$562M
$0 ﹤0.01%
+6
New +$77
ANIP icon
8920
ANI Pharmaceuticals
ANIP
$1.77B
– –
-1,144
Closed -$48.2K
AON icon
8921
Aon
AON
$77.3B
– –
-2,936
Closed -$909K
AORT icon
8922
Artivion
AORT
$1.23B
$0 ﹤0.01%
+8
New +$102
API
8923
CALL
Agora
API
$326M
– –
-900
Closed -$3K
API
8924
Agora
API
$326M
– –
-80,675
Closed -$309K
APLE icon
8925
Apple Hospitality REIT
APLE
$3.96B
– –
-13,361
Closed -$219K
355 356
357
358 359

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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.