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Simplex Trading

Simplex Trading Portfolio holdings

AUM $171B
1-Year Est. Return 85%
 

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
+85%
3 Year Est. Return
+183.25%
5 Year Est. Return
+145.21%
10 Year Est. Return
+1,056.84%
AUM
$122B
AUM Growth
+$7.84B
Cap. Flow
+$86.7M
Cap. Flow %
0.07%
Top 10 Hldgs %
42.57%
Holding
10,535
New
1,474
Increased
3,349
Reduced
3,911
Closed
1,518

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 Miscellaneous 98.43%
2 Technology 0.41%
3 Healthcare 0.21%
4 Consumer Discretionary 0.21%
5 Communication Services 0.21%
Name Market Value Portfolio Weight Shares or Principal Change
in Stake 		Capital Flow
CTAS icon
9101
Cintas
CTAS
$80.2B
– –
-7,084
Closed -$831K
CTMX icon
9102
PUT
CytomX Therapeutics
CTMX
$808M
– –
-1,800
Closed -$2K
CTOS icon
9103
Custom Truck One Source
CTOS
$2.09B
– –
-2,795
Closed -$18.4K
CTSO icon
9104
CALL
Cytosorbents Corp
CTSO
$22M
– –
-8,200
Closed -$27K
CUE icon
9105
Cue Biopharma
CUE
$199M
– –
-386
Closed -$45.4K
CUK
9106
DELISTED
Carnival PLC
CUK
– –
-5,458
Closed -$57.3K
CURI icon
9107
CuriosityStream
CURI
$161M
– –
-3,251
Closed -$3.25K
CVCO icon
9108
Cavco Industries
CVCO
$4.35B
– –
-588
Closed -$169K
CVCO icon
9109
PUT
Cavco Industries
CVCO
$4.35B
– –
-1,200
Closed -$381K
CVEO icon
9110
CALL
Civeo
CVEO
$353M
– –
-66,300
Closed -$1.37M
CVEO icon
9111
PUT
Civeo
CVEO
$353M
– –
-600
Closed -$12K
CVRX icon
9112
CVRx
CVRX
$81.3M
– –
-5,573
Closed -$68K
CXM icon
9113
Sprinklr
CXM
$1.37B
– –
-18,721
Closed -$242K
CXT icon
9114
PUT
Crane NXT
CXT
$2.88B
– –
-47,216
Closed -$1.86M
CYCN icon
9115
CALL
Cyclerion Therapeutics
CYCN
$19.9M
– –
-810
Closed -$7K
CYCN icon
9116
Cyclerion Therapeutics
CYCN
$19.9M
– –
-82
Closed –
CYH icon
9117
Community Health Systems
CYH
$408M
– –
-18,262
Closed -$77.7K
CYBR
9118
DELISTED
CyberArk
CYBR
– –
-2,043
Closed -$293K
BGMS
9119
CALL
Bio Green Med Solution Inc
BGMS
$5.98M
– –
-1
Closed -$1K
BGMS
9120
Bio Green Med Solution Inc
BGMS
$5.98M
– –
0
– –
CYN icon
9121
Cyngn
CYN
$13M
– –
0
– –
DAX icon
9122
Global X DAX Germany ETF
DAX
$226M
– –
-200
Closed -$5K
DBC icon
9123
Invesco DB Commodity Index Tracking Fund
DBC
$1.89B
– –
-357
Closed -$8.28K
DBE icon
9124
Invesco DB Energy Fund
DBE
$109M
$0 ﹤0.01%
7
-9,623
-100% -$192K
DBMF icon
9125
PUT
iMGP DBi Managed Futures Strategy ETF
DBMF
$4.22B
– –
-600
Closed -$15K
363 364
365
366 367

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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, 3,349 increased, 3,911 reduced and 1,518 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 Miscellaneous at 98% of assets, down from 99% a quarter earlier, followed by Technology and Healthcare.

  • 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 1,518 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.