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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
+6.46%
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
$122B
AUM Growth
+$7.84B
Cap. Flow
-$3.39B
Cap. Flow %
-2.78%
Top 10 Hldgs %
42.57%
Holding
10,535
New
1,474
Increased
3,350
Reduced
3,913
Closed
1,517

Top Buys

Rank Stock Value
1
MSFT icon
Microsoft
MSFT
+$53.9M
2
TLT icon
iShares 20+ Year Treasury Bond ETF
TLT
+$52.9M
3
NVDA icon
NVIDIA
NVDA
+$47.1M
4
PYPL icon
PayPal
PYPL
+$41.7M
5
GOOG icon
Alphabet (Google) Class C
GOOG
+$28.4M

Top Sells

Rank Stock Value
1
AAPL icon
Apple
AAPL
+$51.4M
2
WMT icon
Walmart Inc
WMT
+$46.4M
3
OIH icon
VanEck Oil Services ETF
OIH
+$34.2M
4
ADBE icon
Adobe
ADBE
+$33.5M
5
SBUX icon
Starbucks
SBUX
+$26.8M

Sector Composition

Rank Sector Weight
1 Technology 0.41%
2 Healthcare 0.21%
3 Consumer Discretionary 0.21%
4 Communication Services 0.2%
5 Financials 0.15%
Name Market Value Portfolio Weight Shares or Principal Change
in Stake 		Capital Flow
CLFD icon
9051
Clearfield
CLFD
$421M
– –
-10,666
Closed -$455K
CLH icon
9052
Clean Harbors
CLH
$16.1B
– –
-627
Closed -$91.7K
CLMT icon
9053
Calumet Specialty Products
CLMT
$3.63B
– –
-60,159
Closed -$990K
CLOV icon
9054
Clover Health Investments
CLOV
$2.28B
– –
-60,448
Closed -$53.6K
CLS icon
9055
Celestica
CLS
$35.1B
– –
-10,655
Closed -$132K
CLW icon
9056
Clearwater Paper
CLW
$271M
– –
-1,391
Closed -$44.9K
CMBM
9057
DELISTED
Cambium Networks
CMBM
$0 ﹤0.01%
+65
New +$1.01K
CMCL icon
9058
Caledonia Mining Corp
CMCL
$360M
– –
-565
Closed -$7.91K
CMCL icon
9059
PUT
Caledonia Mining Corp
CMCL
$360M
– –
-1,300
Closed -$19K
CMPR icon
9060
CALL
Cimpress
CMPR
$2.37B
– –
-51,800
Closed -$2.27M
CMPR icon
9061
Cimpress
CMPR
$2.37B
– –
-1,770
Closed -$77K
CMPR icon
9062
PUT
Cimpress
CMPR
$2.37B
– –
-16,700
Closed -$731K
CMTG icon
9063
CALL
Claros Mortgage Trust
CMTG
$306M
– –
-400
Closed -$4K
CMTG icon
9064
PUT
Claros Mortgage Trust
CMTG
$306M
– –
-100
Closed -$1K
CNA icon
9065
PUT
CNA Financial
CNA
$14.5B
– –
-300
Closed -$11K
CNM icon
9066
Core & Main
CNM
$8.17B
– –
-306
Closed -$8.19K
CNM icon
9067
PUT
Core & Main
CNM
$8.17B
– –
-1,000
Closed -$23K
CNNE icon
9068
Cannae Holdings
CNNE
$647M
– –
-71
Closed -$1.36K
CNNE icon
9069
PUT
Cannae Holdings
CNNE
$647M
– –
-200
Closed -$4K
CNOB icon
9070
CALL
Center Bancorp
CNOB
$1.63B
– –
-5,200
Closed -$91K
CNS icon
9071
Cohen & Steers
CNS
$4.18B
– –
-72
Closed -$4K
CNS icon
9072
PUT
Cohen & Steers
CNS
$4.18B
– –
-100
Closed -$6K
CNTA
9073
DELISTED
Centessa Pharmaceuticals
CNTA
$0 ﹤0.01%
+38
New +$180
CNXN icon
9074
CALL
PC Connection
CNXN
$2.05B
– –
-800
Closed -$35K
CODX
9075
Co-Diagnostics
CODX
$7.74M
– –
-4
Closed -$153
361 362
363
364 365

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Simplex Trading's Q2 2023 Portfolio in Review

As of Q2 2023, Simplex Trading held 10,535 positions worth $122B, up 6.9% from $114B the previous quarter. Its ten largest holdings account for 43% of the portfolio.

Simplex Trading's Q2 2023 filing shows 1,474 new, 3,350 increased, 3,913 reduced and 1,517 closed positions. Its largest new stake was Microsoft: 171,935 shares worth $58.5M. The largest sale was Apple, an estimated $51.4M.

By sector, the portfolio is most concentrated in Technology at 0.41% of assets, down from 0.42% a quarter earlier, followed by Healthcare and Consumer Discretionary.

  • Simplex Trading's largest Q2 2023 buy was Microsoft: 171,935 shares worth $58.5M.
  • Simplex Trading added most to iShares 20+ Year Treasury Bond ETF in Q2 2023, an estimated $52.9M increase.
  • Simplex Trading's biggest Q2 2023 reduction was Adobe, cutting an estimated $33.5M.
  • Simplex Trading fully exited Apple in Q2 2023, selling an estimated $51.4M.
  • Simplex Trading's ten largest holdings make up 43% of its $122B portfolio in Q2 2023.
  • Simplex Trading opened 1,474 new positions and closed 1,517 in Q2 2023.
  • Simplex Trading's portfolio value rose 6.9% quarter-over-quarter to $122B.

Based on Simplex Trading's 13F filing for Q2 2023, filed 4 Aug 2023.