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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
+8.29%
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
$114B
AUM Growth
+$21.9B
Cap. Flow
-$49.6M
Cap. Flow %
-0.04%
Top 10 Hldgs %
37.97%
Holding
10,803
New
1,536
Increased
3,663
Reduced
3,631
Closed
1,728

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 Miscellaneous 98.51%
2 Technology 0.42%
3 Consumer Discretionary 0.2%
4 Healthcare 0.17%
5 Industrials 0.15%
Name Market Value Portfolio Weight Shares or Principal Change
in Stake 		Capital Flow
SGLY icon
10001
Singularity Future Technology
SGLY
$7.46M
– –
-76
Closed -$4K
SGLY icon
10002
PUT
Singularity Future Technology
SGLY
$7.46M
– –
-110
Closed -$6K
SGU icon
10003
PUT
Star Group
SGU
$418M
– –
-100
Closed -$1K
SHAK icon
10004
Shake Shack
SHAK
$2.8B
– –
-13,728
Closed -$758K
SHEN icon
10005
Shenandoah Telecom
SHEN
$697M
– –
-5,682
Closed -$106K
SHO icon
10006
Sunstone Hotel Investors
SHO
$2.06B
– –
-298
Closed -$3.02K
SID icon
10007
Companhia Siderúrgica Nacional
SID
$1.62B
– –
-41,896
Closed -$135K
SII
10008
Sprott
SII
$3.33B
– –
-1,052
Closed -$39.4K
SITC icon
10009
SITE Centers
SITC
$151M
$0 ﹤0.01%
+87
New +$883
SIVR icon
10010
abrdn Physical Silver Shares ETF
SIVR
$4.48B
– –
-7,324
Closed -$158K
SJB icon
10011
ProShares Short High Yield
SJB
$45.6M
– –
-460
Closed -$8K
SJM icon
10012
J.M. Smucker
SJM
$13.5B
– –
-8,690
Closed -$1.32M
SJT
10013
San Juan Basin Royalty Trust
SJT
$138M
– –
-3,907
Closed -$40.6K
HTO
10014
H2O America
HTO
$2.69B
– –
-563
Closed -$45K
HTO
10015
PUT
H2O America
HTO
$2.69B
– –
-600
Closed -$48K
SKE
10016
Skeena Resources
SKE
$4.15B
– –
-557
Closed -$3.21K
SKIL icon
10017
Skillsoft
SKIL
$61.1M
$0 ﹤0.01%
10
-69
-87% -$2.47K
SKYU icon
10018
ProShares Ultra Nasdaq Cloud Computing ETF
SKYU
$3.8M
– –
-8
Closed –
SLB icon
10019
SLB Ltd
SLB
$85.3B
– –
-183,048
Closed -$9.72M
SLE icon
10020
CALL
Super League Enterprise
SLE
$182M
– –
-2
Closed -$5K
SLE icon
10021
PUT
Super League Enterprise
SLE
$182M
– –
0
– -$1K
SLQT icon
10022
SelectQuote
SLQT
$94.7M
– –
-7,501
Closed -$12.1K
SLRC icon
10023
SLR Investment Corp
SLRC
$686M
– –
-136
Closed -$2.04K
SLRC icon
10024
PUT
SLR Investment Corp
SLRC
$686M
– –
-2,500
Closed -$34K
SLVM icon
10025
Sylvamo
SLVM
$1.43B
– –
-429
Closed -$20.4K
399 400
401
402 403

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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's Q1 2023 filing shows 1,536 new, 3,663 increased, 3,631 reduced and 1,728 closed positions. Its largest new stake was Walmart Inc: 918,957 shares worth $45.2M. The largest sale was Amazon, an estimated $189M.

By sector, the portfolio is most concentrated in Miscellaneous at 99% of assets, up from 98% a quarter earlier, followed by Technology and Consumer Discretionary.

  • 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 1,728 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.