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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
ADT icon
8826
ADT
ADT
$5.16B
– –
-3,168
Closed -$19.8K
ADV icon
8827
Advantage Solutions
ADV
$484M
– –
-56
Closed -$2K
AEE icon
8828
Ameren
AEE
$31.5B
– –
-123
Closed -$10.5K
AEMD icon
8829
Aethlon Medical
AEMD
$1.54M
$0 ﹤0.01%
1
-19
-95% -$5.56K
AER icon
8830
AerCap
AER
$23.9B
– –
-30,195
Closed -$1.74M
AES icon
8831
AES
AES
$10.6B
– –
-26,477
Closed -$583K
AEYE icon
8832
CALL
AudioEye
AEYE
$70.8M
– –
-5,800
Closed -$41K
AFMD
8833
CALL
DELISTED
Affimed
AFMD
– –
-150
Closed -$1K
AFMD
8834
PUT
DELISTED
Affimed
AFMD
– –
-550
Closed -$4K
AFYA icon
8835
Afya
AFYA
$1.27B
– –
-100
Closed -$1K
AFYA icon
8836
PUT
Afya
AFYA
$1.27B
– –
-400
Closed -$4K
AGL icon
8837
Agilon Health
AGL
$1.64B
– –
-125
Closed -$70.2K
AVX
8838
Avax One Technology Ltd
AVX
$25.8M
– –
0
– –
AGX icon
8839
PUT
Argan
AGX
$7.98B
– –
-1,000
Closed -$40K
AHRT
8840
AH Realty Trust
AHRT
$534M
$0 ﹤0.01%
+56
New +$653
AIEQ icon
8841
Amplify AI Powered Equity ETF
AIEQ
$120M
– –
-200
Closed -$5K
AIR icon
8842
CALL
AAR Corp
AIR
$5.15B
– –
-100
Closed -$5K
AKA icon
8843
a.k.a. Brands
AKA
$119M
– –
-354
Closed -$2K
AKR icon
8844
CALL
Acadia Realty Trust
AKR
$2.99B
– –
-1,200
Closed -$16K
AKYA
8845
PUT
DELISTED
Akoya BioSciences
AKYA
– –
-10,700
Closed -$87K
ALC icon
8846
Alcon
ALC
$33.1B
– –
-8,419
Closed -$643K
ALDX icon
8847
Aldeyra Therapeutics
ALDX
$91.7M
– –
-67,325
Closed -$663K
ALEX
8848
DELISTED
Alexander & Baldwin
ALEX
– –
-44
Closed -$824
ALEX
8849
PUT
DELISTED
Alexander & Baldwin
ALEX
– –
-2,700
Closed -$51K
ALG icon
8850
CALL
Alamo Group
ALG
$2.01B
– –
-9,000
Closed -$1.66M
352 353
354
355 356

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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.