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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
-4.08%
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
$127B
AUM Growth
+$5.5B
Cap. Flow
+$11.9B
Cap. Flow %
9.37%
Top 10 Hldgs %
44.01%
Holding
10,417
New
1,399
Increased
3,690
Reduced
3,364
Closed
1,719

Top Buys

Rank Stock Value
1
AMZN icon
Amazon
AMZN
+$113M
2
GLD icon
SPDR Gold Trust
GLD
+$68.6M
3
NVDA icon
NVIDIA
NVDA
+$63.4M
4
TLT icon
iShares 20+ Year Treasury Bond ETF
TLT
+$55.2M
5
AAPL icon
Apple
AAPL
+$54.9M

Top Sells

Rank Stock Value
1
NFLX icon
Netflix
NFLX
+$27.1M
2
QCOM icon
Qualcomm
QCOM
+$24.6M
3
DIS icon
Walt Disney
DIS
+$21.2M
4
AMD icon
Advanced Micro Devices
AMD
+$18.2M
5
SNOW icon
Snowflake
SNOW
+$16.1M

Sector Composition

Rank Sector Weight
1 Technology 0.44%
2 Consumer Discretionary 0.32%
3 Healthcare 0.22%
4 Financials 0.17%
5 Communication Services 0.15%
Name Market Value Portfolio Weight Shares or Principal Change
in Stake 		Capital Flow
ED icon
8901
Consolidated Edison
ED
$41.6B
– –
-16,877
Closed -$1.54M
EDC icon
8902
Direxion Daily MSCI Emerging Markets Bull 3X ETF
EDC
$147M
– –
-759
Closed -$23K
EDU icon
8903
New Oriental
EDU
$7.84B
– –
-458
Closed -$24K
EDZ icon
8904
Direxion Daily MSCI Emerging Markets Bear 3X ETF
EDZ
$18.4M
– –
-368
Closed -$44K
EFXT
8905
PUT
Enerflex
EFXT
$2.78B
– –
-500
Closed -$3K
EFZ icon
8906
ProShares Trust Short MSCI EAFE
EFZ
$12.3M
$0 ﹤0.01%
11
-27
-71% -$989
EG icon
8907
Everest Group
EG
$15.2B
– –
-676
Closed -$245K
EGAN icon
8908
CALL
eGain
EGAN
$176M
– –
-200
Closed -$1K
EGHT icon
8909
8x8 Inc
EGHT
$247M
– –
-17,029
Closed -$60.5K
EGO icon
8910
Eldorado Gold
EGO
$8.31B
– –
-30,405
Closed -$296K
EHAB
8911
DELISTED
Enhabit
EHAB
– –
-238
Closed -$3K
EHTH icon
8912
eHealth
EHTH
$42.5M
– –
-12,159
Closed -$95.5K
EINC icon
8913
PUT
VanEck Energy Income ETF
EINC
$102M
– –
-200
Closed -$1K
ELA icon
8914
PUT
Envela
ELA
$536M
– –
-700
Closed -$5K
ELP
8915
CALL
DELISTED
Companhia Paranaense de Energia (COPEL)
ELP
– –
-375
Closed -$2K
ELS icon
8916
CALL
Equity Lifestyle Properties
ELS
$12.8B
– –
-4,400
Closed -$294K
ELV icon
8917
Elevance Health
ELV
$81.9B
– –
-2,483
Closed -$1.13M
ELVN icon
8918
CALL
Enliven Therapeutics
ELVN
$3.78B
– –
-2,200
Closed -$44K
EMBC icon
8919
Embecta
EMBC
$195M
$0 ﹤0.01%
58
-6,207
-99% -$116K
EMQQ icon
8920
EMQQ The Emerging Markets Internet & Ecommerce ETF
EMQQ
$258M
– –
-28
Closed –
EMX
8921
DELISTED
EMX Royalty
EMX
$0 ﹤0.01%
513
+80
+18% +$147
ENIC icon
8922
Enel Chile
ENIC
$5.96B
$0 ﹤0.01%
154
+13
+9% +$43
ENLV icon
8923
Enlivex Ltd
ENLV
$70.7M
– –
-845
Closed -$29.2K
ENS icon
8924
EnerSys
ENS
$6.95B
– –
-3,770
Closed -$387K
ENTA icon
8925
Enanta Pharmaceuticals
ENTA
$372M
– –
-188
Closed -$4K
355 356
357
358 359

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Simplex Trading's Q3 2023 Portfolio in Review

As of Q3 2023, Simplex Trading held 10,417 positions worth $127B, up 4.5% from $122B the previous quarter. Its ten largest holdings account for 44% of the portfolio.

Simplex Trading deployed $11.9B of net new capital in Q3 2023, opening 1,399 new positions and adding to 3,690 existing holdings. Its largest new stake was Amazon: 841,102 shares worth $107M.

By sector, the portfolio is most concentrated in Technology at 0.44% of assets, up from 0.41% a quarter earlier, followed by Consumer Discretionary and Healthcare.

On the sell side, the largest reduction was Netflix, an estimated $27.1M trimmed.

  • Simplex Trading's largest Q3 2023 buy was Amazon: 841,102 shares worth $107M.
  • Simplex Trading added most to SPDR Gold Trust in Q3 2023, an estimated $68.6M increase.
  • Simplex Trading's biggest Q3 2023 reduction was Netflix, cutting an estimated $27.1M.
  • Simplex Trading fully exited Qualcomm in Q3 2023, selling an estimated $24.6M.
  • Simplex Trading's ten largest holdings make up 44% of its $127B portfolio in Q3 2023.
  • Simplex Trading opened 1,399 new positions and closed 1,719 in Q3 2023.
  • Simplex Trading's portfolio value rose 4.5% quarter-over-quarter to $127B.

Based on Simplex Trading's 13F filing for Q3 2023, filed 1 Nov 2023.