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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
TTSH
10151
CALL
DELISTED
Tile Shop Holdings
TTSH
– –
-800
Closed -$3K
TTSH
10152
DELISTED
Tile Shop Holdings
TTSH
– –
-5,078
Closed -$22K
TU icon
10153
Telus
TU
$15.9B
– –
-1,774
Closed -$36.1K
TUR icon
10154
iShares MSCI Turkey ETF
TUR
$209M
– –
-16,127
Closed -$596K
TURN
10155
DELISTED
180 Degree Capital
TURN
$0 ﹤0.01%
113
-110
-49% -$584
TUYA
10156
Tuya Inc
TUYA
$1.07B
– –
-3,066
Closed -$6.92K
TV icon
10157
Televisa
TV
$1.49B
– –
-9,872
Closed -$53K
TW icon
10158
Tradeweb Markets
TW
$21.1B
– –
-3,192
Closed -$231K
TWST icon
10159
Twist Bioscience
TWST
$5.87B
– –
-16,048
Closed -$355K
TX icon
10160
Ternium
TX
$9.08B
– –
-9,519
Closed -$374K
TXG icon
10161
10x Genomics
TXG
$5.97B
– –
-1,053
Closed -$49.2K
TXMD icon
10162
TherapeuticsMD
TXMD
$23.4M
– –
-1,118
Closed -$5.36K
TXT icon
10163
Textron
TXT
$15.9B
– –
-2,189
Closed -$156K
TZOO icon
10164
Travelzoo
TZOO
$105M
$0 ﹤0.01%
2
-299
-99% -$1.53K
TZOO icon
10165
PUT
Travelzoo
TZOO
$105M
– –
-1,000
Closed -$4K
UAMY icon
10166
United States Antimony
UAMY
$865M
$0 ﹤0.01%
200
-100
-33% -$41
UAMY icon
10167
PUT
United States Antimony
UAMY
$865M
– –
-92,100
Closed -$44K
UAVS icon
10168
CALL
AgEagle Aerial Systems
UAVS
$42M
– –
-47
Closed -$16K
UBER icon
10169
Uber
UBER
$143B
– –
-498,532
Closed -$15.8M
UCO icon
10170
ProShares Ultra Bloomberg Crude Oil
UCO
$431M
– –
-15,095
Closed -$457K
UCTT
10171
Ultra Clean Holdings
UCTT
$4.55B
– –
-1,906
Closed -$63K
UDN icon
10172
Invesco DB US Dollar Index Bearish Fund
UDN
$107M
– –
-84,069
Closed -$1.55M
UEIC icon
10173
Universal Electronics
UEIC
$57.7M
– –
-151
Closed -$2.63K
UFCS icon
10174
United Fire Group
UFCS
$1.27B
$0 ﹤0.01%
19
-300
-94% -$8.54K
UFCS icon
10175
PUT
United Fire Group
UFCS
$1.27B
– –
-1,200
Closed -$32K
405 406
407
408 409

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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.