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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
+21.82%
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
$175B
AUM Growth
+$18.5B
Cap. Flow
-$10.5B
Cap. Flow %
-6.03%
Top 10 Hldgs %
47.16%
Holding
10,048
New
1,525
Increased
3,308
Reduced
3,590
Closed
1,431

Top Buys

Rank Stock Value
1
NVDA icon
NVIDIA
NVDA
+$172M
2
AAPL icon
Apple
AAPL
+$156M
3
AVGO icon
Broadcom
AVGO
+$101M
4
SPY icon
State Street SPDR S&P 500 ETF Trust
SPY
+$57.2M
5
UNH icon
UnitedHealth
UNH
+$55.1M

Top Sells

Rank Stock Value
1
TLT icon
iShares 20+ Year Treasury Bond ETF
TLT
+$140M
2
AMZN icon
Amazon
AMZN
+$47.9M
3
NFLX icon
Netflix
NFLX
+$38.3M
4
TSM icon
TSMC
TSM
+$37.3M
5
PFE icon
Pfizer
PFE
+$36.9M

Sector Composition

Rank Sector Weight
1 Technology 0.74%
2 Communication Services 0.19%
3 Consumer Discretionary 0.18%
4 Healthcare 0.17%
5 Financials 0.14%
Name Market Value Portfolio Weight Shares or Principal Change
in Stake 		Capital Flow
ENIC icon
8901
Enel Chile
ENIC
$6.07B
– –
-223
Closed –
ENLV icon
8902
Enlivex Ltd
ENLV
$73.4M
– –
-71
Closed -$1.05K
ENLT icon
8903
Enlight Renewable Energy
ENLT
$12.6B
– –
-160,319
Closed -$2.9M
ENLT icon
8904
PUT
Enlight Renewable Energy
ENLT
$12.6B
– –
-161,700
Closed -$2.61M
ENVA icon
8905
PUT
Enova International
ENVA
$5.42B
– –
-200
Closed -$19K
EOLS icon
8906
CALL
Evolus
EOLS
$394M
– –
-12,900
Closed -$155K
EPAC icon
8907
CALL
Enerpac Tool Group
EPAC
$1.76B
– –
-100
Closed -$4K
EPAC icon
8908
PUT
Enerpac Tool Group
EPAC
$1.76B
– –
-100
Closed -$4K
EPC icon
8909
Edgewell Personal Care
EPC
$1.23B
– –
-525
Closed -$14.6K
EPC icon
8910
PUT
Edgewell Personal Care
EPC
$1.23B
– –
-5,500
Closed -$171K
EPP icon
8911
iShares MSCI Pacific ex Japan ETF
EPP
$2.16B
– –
-1
Closed –
EPSN icon
8912
PUT
Epsilon Energy
EPSN
$179M
– –
-300
Closed -$2K
EQH icon
8913
Equitable Holdings
EQH
$12.9B
– –
-1,288
Closed -$66.2K
EQNR icon
8914
Equinor
EQNR
$97.4B
– –
-8,057
Closed -$195K
EQR icon
8915
Equity Residential
EQR
$25.6B
– –
-17,613
Closed -$1.21M
EQTY icon
8916
CALL
Kovitz Core Equity ETF
EQTY
$1.39B
– –
-300
Closed -$6K
ERAS icon
8917
PUT
Erasca
ERAS
$6.71B
– –
-800
Closed -$1K
ERIE icon
8918
PUT
Erie Indemnity
ERIE
$11.2B
– –
-100
Closed -$41K
EMBJ
8919
Embraer S.A. ADS
EMBJ
$11.7B
– –
-17,435
Closed -$823K
ESAB icon
8920
ESAB
ESAB
$5.2B
– –
-45
Closed -$5.44K
ESAB icon
8921
PUT
ESAB
ESAB
$5.2B
– –
-300
Closed -$34K
ERY icon
8922
Direxion Daily Energy Bear 2X ETF
ERY
$37.7M
– –
-876
Closed -$18K
ESRT icon
8923
CALL
Empire State Realty Trust
ESRT
$941M
– –
-200
Closed -$1K
ETON icon
8924
Eton Pharmaceutcials
ETON
$1.21B
– –
-4,472
Closed -$70.7K
ETON icon
8925
PUT
Eton Pharmaceutcials
ETON
$1.21B
– –
-3,600
Closed -$46K
355 356
357
358 359

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Simplex Trading's Q2 2025 Portfolio in Review

As of Q2 2025, Simplex Trading held 10,048 positions worth $175B, up 12% from $156B the previous quarter. Its ten largest holdings account for 47% of the portfolio.

Simplex Trading withdrew a net $10.5B in Q2 2025, closing 1,431 positions and reducing 3,590 holdings. Its most notable exit was Constellation Energy, an estimated $35.8M position sold in full.

By sector, the portfolio is most concentrated in Technology at 0.74% of assets, up from 0.41% a quarter earlier, followed by Communication Services and Consumer Discretionary.

Against the trend, Simplex Trading opened a new position in State Street SPDR S&P 500 ETF Trust worth $61.9M.

  • Simplex Trading's largest Q2 2025 buy was State Street SPDR S&P 500 ETF Trust: 100,129 shares worth $61.9M.
  • Simplex Trading added most to NVIDIA in Q2 2025, an estimated $172M increase.
  • Simplex Trading's biggest Q2 2025 reduction was iShares 20+ Year Treasury Bond ETF, cutting an estimated $140M.
  • Simplex Trading fully exited Constellation Energy in Q2 2025, selling an estimated $35.8M.
  • Simplex Trading's ten largest holdings make up 47% of its $175B portfolio in Q2 2025.
  • Simplex Trading opened 1,525 new positions and closed 1,431 in Q2 2025.
  • Simplex Trading's portfolio value rose 12% quarter-over-quarter to $175B.

Based on Simplex Trading's 13F filing for Q2 2025, filed 5 Aug 2025.