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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
+8.29%
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
$114B
AUM Growth
+$21.9B
Cap. Flow
+$10.1B
Cap. Flow %
8.87%
Top 10 Hldgs %
37.97%
Holding
10,803
New
1,536
Increased
3,665
Reduced
3,633
Closed
1,729

Top Buys

Rank Stock Value
1
WMT icon
Walmart Inc
WMT
+$43.6M
2
AAPL icon
Apple
AAPL
+$40.9M
3
OIH icon
VanEck Oil Services ETF
OIH
+$37.7M
4
C icon
Citigroup
C
+$34.2M
5
TLT icon
iShares 20+ Year Treasury Bond ETF
TLT
+$32.7M

Top Sells

Rank Stock Value
1
AMZN icon
Amazon
AMZN
+$189M
2
QQQ icon
Invesco QQQ Trust
QQQ
+$123M
3
NVDA icon
NVIDIA
NVDA
+$115M
4
TSLA icon
Tesla
TSLA
+$52M
5
META icon
Meta Platforms (Facebook)
META
+$49M

Sector Composition

Rank Sector Weight
1 Technology 0.42%
2 Consumer Discretionary 0.2%
3 Healthcare 0.17%
4 Industrials 0.15%
5 Communication Services 0.13%
Name Market Value Portfolio Weight Shares or Principal Change
in Stake 		Capital Flow
SAM icon
9976
Boston Beer
SAM
$1.74B
– –
-876
Closed -$301K
SANA icon
9977
Sana Biotechnology
SANA
$899M
– –
-1,572
Closed -$6.28K
SANA icon
9978
PUT
Sana Biotechnology
SANA
$899M
– –
-1,200
Closed -$4K
SANM icon
9979
Sanmina
SANM
$11.7B
– –
-878
Closed -$52.6K
SANW
9980
DELISTED
S&W Seed Co
SANW
– –
-3
Closed -$96
SATL icon
9981
Satellogic
SATL
$559M
$0 ﹤0.01%
11
-28,702
-100% -$88.6K
ECHO
9982
CALL
EchoStar
ECHO
$26.5B
– –
-200
Closed -$3K
SBAC icon
9983
SBA Communications
SBAC
$18.6B
– –
-1,706
Closed -$469K
SBEV icon
9984
CALL
Splash Beverage Group
SBEV
– –
-2,503
Closed -$96K
SBEV icon
9985
PUT
Splash Beverage Group
SBEV
– –
-143
Closed -$5K
SBRA icon
9986
Sabra Healthcare REIT
SBRA
$5.54B
– –
-757
Closed -$9.37K
SCHG icon
9987
Schwab US Large-Cap Growth ETF
SCHG
$58.4B
– –
-3,432
Closed -$47K
SCI icon
9988
Service Corp International
SCI
$11B
– –
-13,451
Closed -$929K
SCSC icon
9989
PUT
Scansource
SCSC
$1.1B
– –
-200
Closed -$5K
SDEM icon
9990
Global X MSCI SuperDividend Emerging Markets ETF
SDEM
$44.4M
– –
-121
Closed -$2K
SDGR icon
9991
Schrodinger
SDGR
$1.13B
– –
-3,805
Closed -$90.4K
SDP icon
9992
ProShares UltraShort Utilities
SDP
$3.85M
– –
-345
Closed -$14K
SDS icon
9993
ProShares UltraShort S&P500
SDS
$408M
– –
-33,891
Closed -$7.79M
SEAT icon
9994
Vivid Seats
SEAT
$74.6M
– –
-256
Closed -$40K
SEAT icon
9995
PUT
Vivid Seats
SEAT
$74.6M
– –
-505
Closed -$73K
SEE
9996
PUT
DELISTED
Sealed Air
SEE
– –
-900
Closed -$44K
SELF
9997
CALL
Global Self Storage
SELF
$58.3M
– –
-1,200
Closed -$5K
SEMR
9998
DELISTED
Semrush
SEMR
– –
-153
Closed -$1.35K
SGHT icon
9999
Sight Sciences
SGHT
$254M
– –
-149
Closed -$1K
SGLY icon
10000
CALL
Singularity Future Technology
SGLY
$3.13M
– –
-2,640
Closed -$11K
398 399
400
401 402

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Simplex Trading's Q1 2023 Portfolio in Review

As of Q1 2023, Simplex Trading held 10,803 positions worth $114B, up 24% from $91.9B the previous quarter. Its ten largest holdings account for 38% of the portfolio.

Simplex Trading deployed $10.1B of net new capital in Q1 2023, opening 1,536 new positions and adding to 3,665 existing holdings. Its largest new stake was Walmart Inc: 918,957 shares worth $45.2M.

By sector, the portfolio is most concentrated in Technology at 0.42% of assets, up from 0.35% a quarter earlier, followed by Consumer Discretionary and Healthcare.

On the sell side, the largest reduction was Meta Platforms (Facebook), an estimated $49M trimmed.

  • Simplex Trading's largest Q1 2023 buy was Walmart Inc: 918,957 shares worth $45.2M.
  • Simplex Trading added most to Apple in Q1 2023, an estimated $40.9M increase.
  • Simplex Trading's biggest Q1 2023 reduction was Meta Platforms (Facebook), cutting an estimated $49M.
  • Simplex Trading fully exited Amazon in Q1 2023, selling an estimated $189M.
  • Simplex Trading's ten largest holdings make up 38% of its $114B portfolio in Q1 2023.
  • Simplex Trading opened 1,536 new positions and closed 1,729 in Q1 2023.
  • Simplex Trading's portfolio value rose 24% quarter-over-quarter to $114B.

Based on Simplex Trading's 13F filing for Q1 2023, filed 27 Apr 2023.