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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
SPXU icon
9876
ProShares UltraPro Short S&P 500
SPXU
$421M
– –
-8,935
Closed -$2.41M
SRCE icon
9877
1st Source
SRCE
$1.99B
– –
-46
Closed -$1K
SRCE icon
9878
PUT
1st Source
SRCE
$1.99B
– –
-100
Closed -$4K
SRDX
9879
DELISTED
Surmodics
SRDX
– –
-231
Closed -$5K
SRDX
9880
PUT
DELISTED
Surmodics
SRDX
– –
-300
Closed -$6K
SRTS icon
9881
PUT
Sensus Healthcare
SRTS
$50M
– –
-7,000
Closed -$36K
SSL icon
9882
Sasol
SSL
$7.26B
$0 ﹤0.01%
49
-1,531
-97% -$19.7K
NSLR
9883
CALL
Neostellar Capital Corp
NSLR
$282M
– –
-2,500
Closed -$9K
NSLR
9884
PUT
Neostellar Capital Corp
NSLR
$282M
– –
-11,100
Closed -$40K
STE icon
9885
Steris
STE
$20.5B
– –
-5
Closed -$1K
STEP icon
9886
StepStone Group
STEP
$3.36B
– –
-3,265
Closed -$79K
STEP icon
9887
PUT
StepStone Group
STEP
$3.36B
– –
-1,900
Closed -$46K
STEM icon
9888
Stem
STEM
$53.8M
– –
-3,934
Closed -$390K
STIM icon
9889
CALL
Neuronetics
STIM
$134M
– –
-7,800
Closed -$22K
STIM icon
9890
Neuronetics
STIM
$134M
– –
-1,554
Closed -$3.77K
STKH
9891
Steakholder Foods
STKH
$994K
– –
-2
Closed -$619
STLA icon
9892
Stellantis
STLA
$16.8B
– –
-76,079
Closed -$1.28M
STLD icon
9893
Steel Dynamics
STLD
$34.4B
– –
-3,009
Closed -$306K
STRA icon
9894
Strategic Education
STRA
$1.67B
– –
-303
Closed -$24.7K
STTK icon
9895
Shattuck Labs
STTK
$670M
$0 ﹤0.01%
+285
New +$827
SUP
9896
DELISTED
Superior Industries International
SUP
– –
-24,971
Closed -$102K
SUP
9897
PUT
DELISTED
Superior Industries International
SUP
– –
-57,600
Closed -$285K
SUPN icon
9898
CALL
Supernus Pharmaceuticals
SUPN
$2.72B
– –
-1,000
Closed -$36K
SWIM icon
9899
PUT
Latham Group
SWIM
$686M
– –
-1,000
Closed -$2K
SY
9900
CALL
So-Young International
SY
$186M
– –
-2,800
Closed -$6K
394 395
396
397 398

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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.