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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
INST
5851
CALL
DELISTED
Instructure Holdings, Inc.
INST
$50K ﹤0.01%
2,000
+1,500
+300% +$37.6K
SYNH
5852
CALL
DELISTED
Syneos Health, Inc. Class A Common Stock
SYNH
$50K ﹤0.01%
1,200
– –
SBDS
5853
DELISTED
Solo Brands Inc
SBDS
$50K ﹤0.01%
222
+55
+33% +$13.7K
AL
5854
DELISTED
Air Lease Corp
AL
$49K ﹤0.01%
1,171
-7,278
-86% -$288K
ALT icon
5855
CALL
Altimmune
ALT
$552M
$49K ﹤0.01%
13,900
-130,300
-90% -$585K
ARCB icon
5856
PUT
ArcBest
ARCB
$3.23B
$49K ﹤0.01%
500
-2,200
-81% -$197K
BHR
5857
Braemar Hotels & Resorts
BHR
$156M
$49K ﹤0.01%
12,263
+3,229
+36% +$12.7K
BIOX icon
5858
PUT
Bioceres Crop Solutions
BIOX
$23M
$49K ﹤0.01%
3,700
-200
-5% -$2.35K
BKR icon
5859
Baker Hughes
BKR
$60B
$49K ﹤0.01%
+1,580
New +$46.1K
BKSY icon
5860
BlackSky Technology
BKSY
$943M
$49K ﹤0.01%
2,780
+2,379
+593% +$28.4K
CAPL icon
5861
CALL
CrossAmerica Partners
CAPL
$847M
$49K ﹤0.01%
2,500
+200
+9% +$4.01K
CRVS icon
5862
CALL
Corvus Pharmaceuticals
CRVS
$1.12B
$49K ﹤0.01%
+21,600
New +$44.9K
GNTX icon
5863
CALL
Gentex
GNTX
$4.97B
$49K ﹤0.01%
1,700
-5,800
-77% -$160K
MIRM icon
5864
CALL
Mirum Pharmaceuticals
MIRM
$6.46B
$49K ﹤0.01%
1,900
-1,500
-44% -$39.9K
NVTS icon
5865
CALL
Navitas Semiconductor
NVTS
$2.84B
$49K ﹤0.01%
4,700
-15,900
-77% -$123K
OPEN icon
5866
Opendoor
OPEN
$3.64B
$49K ﹤0.01%
12,607
-221,016
-95% -$480K
ORGO icon
5867
PUT
Organogenesis Holdings
ORGO
$305M
$49K ﹤0.01%
15,000
-7,000
-32% -$20.7K
RXT icon
5868
CALL
Rackspace Technology
RXT
$1.05B
$49K ﹤0.01%
18,300
+13,300
+266% +$21.9K
SHOE
5869
PUT
Shoe Station Group
SHOE
$413M
$49K ﹤0.01%
2,100
+100
+5% +$2.3K
TUSK icon
5870
CALL
Mammoth Energy Services
TUSK
$128M
$49K ﹤0.01%
10,300
+6,500
+171% +$26.9K
CBD
5871
DELISTED
Companhia Brasileira de Distribuicao
CBD
$49K ﹤0.01%
12,729
-2,324
-15% -$7.59K
HCCI
5872
CALL
DELISTED
Heritage-Crystal Clean, Inc.
HCCI
$49K ﹤0.01%
1,300
– –
ABG icon
5873
PUT
Asbury Automotive
ABG
$4.31B
$48K ﹤0.01%
200
-500
-71% -$105K
BWEN icon
5874
PUT
Broadwind
BWEN
$93.6M
$48K ﹤0.01%
12,600
+8,400
+200% +$35.1K
CAPR icon
5875
Capricor Therapeutics
CAPR
$223M
$48K ﹤0.01%
+10,146
New +$44.6K
233 234
235
236 237

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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.