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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
CTKB icon
8001
PUT
Cytek Biosciences
CTKB
$576M
$4K ﹤0.01%
+500
New +$4.49K
CUZ icon
8002
PUT
Cousins Properties
CUZ
$5.29B
$4K ﹤0.01%
200
-400
-67% -$8.37K
CVLG icon
8003
PUT
Covenant Logistics
CVLG
$1.18B
$4K ﹤0.01%
200
– –
CXT icon
8004
CALL
Crane NXT
CXT
$3.04B
$4K ﹤0.01%
200
-19,953
-99% -$1.01M
DDL
8005
CALL
Dingdong
DDL
$529M
$4K ﹤0.01%
+1,300
New +$4.33K
DEM icon
8006
WisdomTree Emerging Markets High Dividend Fund
DEM
$3.88B
$4K ﹤0.01%
109
-8,303
-99% -$319K
DFH icon
8007
PUT
Dream Finders Homes
DFH
$1.46B
$4K ﹤0.01%
200
-200
-50% -$3.6K
DRLL icon
8008
Strive US Energy ETF
DRLL
$298M
$4K ﹤0.01%
170
-549
-76% -$15K
DXLG icon
8009
PUT
Destination XL Group
DXLG
$34.7M
$4K ﹤0.01%
1,000
-40,500
-98% -$190K
ENTA icon
8010
Enanta Pharmaceuticals
ENTA
$372M
$4K ﹤0.01%
188
-62
-25% -$1.83K
EQ icon
8011
PUT
Equillium
EQ
$157M
$4K ﹤0.01%
+6,000
New +$3.97K
ESCA icon
8012
PUT
Escalade
ESCA
$257M
$4K ﹤0.01%
+300
New +$4.08K
ESNT icon
8013
PUT
Essent Group
ESNT
$6.06B
$4K ﹤0.01%
100
-500
-83% -$21.8K
EWG icon
8014
iShares MSCI Germany ETF
EWG
$1.5B
$4K ﹤0.01%
142
-98,307
-100% -$2.82M
EYE icon
8015
PUT
National Vision
EYE
$1.6B
$4K ﹤0.01%
200
– –
FOSL icon
8016
CALL
Fossil Group
FOSL
$239M
$4K ﹤0.01%
1,800
-7,000
-80% -$19.2K
FRME icon
8017
First Merchants
FRME
$2.72B
$4K ﹤0.01%
+142
New +$4.03K
FSTR icon
8018
CALL
Foster
FSTR
$443M
$4K ﹤0.01%
300
– –
FTCI icon
8019
PUT
FTC Solar
FTCI
$47.4M
$4K ﹤0.01%
+130
New +$3.57K
GBCI icon
8020
Glacier Bancorp
GBCI
$6.55B
$4K ﹤0.01%
+136
New +$4.49K
GBIO
8021
PUT
DELISTED
Generation Bio
GBIO
$4K ﹤0.01%
80
+10
+14% +$459
GEL icon
8022
CALL
Genesis Energy
GEL
$1.84B
$4K ﹤0.01%
500
-97,600
-99% -$1.01M
GMAB icon
8023
Genmab
GMAB
$17.7B
$4K ﹤0.01%
+121
New +$4.82K
GNPX icon
8024
CALL
Genprex
GNPX
$3.94M
– –
-1
Closed -$37.2K
GP
8025
GreenPower Motor Co
GP
$10.5M
$4K ﹤0.01%
166
-245
-60% -$6.46K
319 320
321
322 323

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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.