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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
CDNA icon
9026
CareDx
CDNA
$1.92B
$0 ﹤0.01%
+16
New +$133
CDTX
9027
DELISTED
Cidara Therapeutics
CDTX
– –
-978
Closed -$23K
CDZI icon
9028
CALL
Cadiz
CDZI
$266M
– –
-2,200
Closed -$8K
CECO icon
9029
CALL
Ceco Environmental
CECO
$4.42B
– –
-6,700
Closed -$93K
CECO icon
9030
PUT
Ceco Environmental
CECO
$4.42B
– –
-100
Closed -$1K
CELC icon
9031
CALL
Celcuity
CELC
$4.03B
– –
-3,200
Closed -$32K
CELU icon
9032
Celularity
CELU
$21.7M
– –
-98
Closed -$628
CELU icon
9033
PUT
Celularity
CELU
$21.7M
– –
-180
Closed -$1K
CEMB icon
9034
iShares JPMorgan EM Corporate Bond ETF
CEMB
$393M
– –
-93
Closed -$4K
CENN icon
9035
CALL
Cenntro
CENN
$8.23M
– –
-4
Closed -$1K
CENN icon
9036
PUT
Cenntro
CENN
$8.23M
– –
-13
Closed -$3K
CFFN icon
9037
CALL
Capitol Federal Financial
CFFN
$1.08B
– –
-4,200
Closed -$28K
CFR icon
9038
Cullen/Frost Bankers
CFR
$10.3B
– –
-6,944
Closed -$725K
CGAU
9039
Centerra Gold
CGAU
$3.22B
– –
-6,692
Closed -$42.5K
CGEN icon
9040
Compugen
CGEN
$216M
$0 ﹤0.01%
113
-12,852
-99% -$11.2K
CHD icon
9041
Church & Dwight Co
CHD
$23.1B
– –
-5,190
Closed -$489K
CHE icon
9042
CALL
Chemed
CHE
$6.78B
– –
-100
Closed -$53K
CHIQ icon
9043
Global X MSCI China Consumer Discretionary ETF
CHIQ
$124M
– –
-4,647
Closed -$93K
CHX
9044
DELISTED
ChampionX
CHX
– –
-19,330
Closed -$532K
CIB icon
9045
Grupo Cibest SA
CIB
$20.4B
– –
-100
Closed -$2.61K
CINF icon
9046
Cincinnati Financial
CINF
$28.3B
– –
-6,499
Closed -$671K
CISO
9047
CISO Global
CISO
$11.8M
$0 ﹤0.01%
47
-54
-53% -$180
CKPT
9048
DELISTED
Checkpoint Therapeutics
CKPT
– –
-8,327
Closed -$22.7K
CLB icon
9049
Core Laboratories
CLB
$538M
– –
-4,729
Closed -$107K
CLDT
9050
PUT
Chatham Lodging
CLDT
$630M
– –
-17,200
Closed -$180K
360 361
362
363 364

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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.