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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
CINT icon
8751
CALL
CI&T Inc
CINT
$400M
– –
-7,500
Closed -$47K
CISO
8752
CISO Global
CISO
$11.8M
$0 ﹤0.01%
33
-14
-30% -$37
CLB icon
8753
PUT
Core Laboratories
CLB
$538M
– –
-100
Closed -$2K
CLBT icon
8754
CALL
Cellebrite
CLBT
$3.54B
– –
-8,000
Closed -$57K
CLDT
8755
CALL
Chatham Lodging
CLDT
$630M
– –
-4,600
Closed -$43K
CLDX icon
8756
Celldex Therapeutics
CLDX
$2.77B
– –
-491
Closed -$15.4K
CLGN icon
8757
CollPlant Biotechnologies
CLGN
$5.95M
$0 ﹤0.01%
+100
New +$662
CLNE icon
8758
Clean Energy Fuels
CLNE
$447M
– –
-16,329
Closed -$72.7K
CLPR
8759
Clipper Realty
CLPR
$46.5M
$0 ﹤0.01%
39
-244
-86% -$1.46K
CLPR
8760
PUT
Clipper Realty
CLPR
$46.5M
– –
-600
Closed -$3K
CLPS icon
8761
CLPS Inc
CLPS
$26.1M
$0 ﹤0.01%
+96
New +$101
CLPT icon
8762
ClearPoint Neuro
CLPT
$423M
– –
-1,600
Closed -$9.52K
CLPT icon
8763
PUT
ClearPoint Neuro
CLPT
$423M
– –
-3,400
Closed -$24K
CLVT icon
8764
Clarivate
CLVT
$1.3B
– –
-3,455
Closed -$27.5K
CLVT icon
8765
PUT
Clarivate
CLVT
$1.3B
– –
-2,700
Closed -$25K
CLX icon
8766
Clorox
CLX
$11.6B
– –
-9,433
Closed -$1.43M
CMBM
8767
CALL
DELISTED
Cambium Networks
CMBM
– –
-100
Closed -$1K
CMCL icon
8768
Caledonia Mining Corp
CMCL
$360M
$0 ﹤0.01%
+61
New +$675
CMCO icon
8769
CALL
Columbus McKinnon
CMCO
$465M
– –
-1,000
Closed -$40K
CMCM
8770
Cheetah Mobile
CMCM
$88.8M
– –
-3,121
Closed -$7.02K
CMCT
8771
Creative Media & Community Trust
CMCT
$8.25M
– –
0
– –
CMS icon
8772
PUT
CMS Energy
CMS
$23.1B
– –
-800
Closed -$47K
CNK icon
8773
Cinemark Holdings
CNK
$3.82B
– –
-5,646
Closed -$94.5K
CNM icon
8774
CALL
Core & Main
CNM
$8.17B
– –
-100
Closed -$3K
CNO icon
8775
CALL
CNO Financial Group
CNO
$4.97B
– –
-4,200
Closed -$99K
349 350
351
352 353

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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.