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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
+3.1%
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
$149B
AUM Growth
-$28.3B
Cap. Flow
-$18.1B
Cap. Flow %
-12.12%
Top 10 Hldgs %
51.08%
Holding
10,500
New
2,156
Increased
2,652
Reduced
3,926
Closed
1,574

Top Buys

Rank Stock Value
1
AMZN icon
Amazon
AMZN
+$168M
2
NVDA icon
NVIDIA
NVDA
+$141M
3
TSM icon
TSMC
TSM
+$121M
4
META icon
Meta Platforms (Facebook)
META
+$107M
5
GLD icon
SPDR Gold Trust
GLD
+$103M

Top Sells

Rank Stock Value
1
AAPL icon
Apple
AAPL
+$174M
2
WDC icon
Western Digital
WDC
+$87.7M
3
AVGO icon
Broadcom
AVGO
+$62.2M
4
SOXL icon
Direxion Daily Semiconductor Bull 3X ETF
SOXL
+$52M
5
NFLX icon
Netflix
NFLX
+$44.6M

Sector Composition

Rank Sector Weight
1 Technology 0.62%
2 Communication Services 0.22%
3 Consumer Discretionary 0.21%
4 Healthcare 0.2%
5 Industrials 0.1%
Name Market Value Portfolio Weight Shares or Principal Change
in Stake 		Capital Flow
SZK icon
10126
ProShares UltraShort Consumer Staples
SZK
$9.26M
– –
-121
Closed -$3.11K
TAL icon
10127
TAL Education Group
TAL
$5.72B
– –
-93,939
Closed -$1.06M
TASK icon
10128
TaskUs
TASK
$533M
– –
-1,792
Closed -$19K
TBF icon
10129
ProShares Short 20+ Year Treasury ETF
TBF
$84.6M
– –
-2,810
Closed -$67.8K
TBT icon
10130
ProShares Trust UltraShort Lehman 20+ Year Treasury
TBT
$291M
– –
-37,809
Closed -$1.32M
TCMD icon
10131
Tactile Systems Technology
TCMD
$640M
– –
-9
Closed -$257
TCX icon
10132
CALL
Tucows
TCX
$114M
– –
-200
Closed -$4.48K
TDC icon
10133
Teradata
TDC
$2.88B
– –
-4,533
Closed -$132K
TDS icon
10134
Telephone and Data Systems
TDS
$3.85B
– –
-31,116
Closed -$1.37M
TDUP icon
10135
ThredUp
TDUP
$850M
– –
-25,779
Closed -$120K
TEAM icon
10136
Atlassian
TEAM
$23B
– –
-34,148
Closed -$3.37M
TECL icon
10137
Direxion Daily Technology Bull 3x ETF
TECL
$5.6B
– –
-15,468
Closed -$1.66M
TEF
10138
PUT
DELISTED
Telefonica
TEF
– –
-100
Closed -$405
TENB icon
10139
Tenable Holdings
TENB
$3.76B
– –
-649
Closed -$13.6K
TEO icon
10140
Telecom Argentina
TEO
$5.67B
– –
-152
Closed -$1.77K
TG icon
10141
Tredegar Corp
TG
$263M
– –
-17
Closed -$122
TGNA
10142
CALL
DELISTED
TEGNA Inc
TGNA
– –
-2,000
Closed -$38.8K
TGNA
10143
DELISTED
TEGNA Inc
TGNA
– –
-3,950
Closed -$78.7K
TGS icon
10144
Transportadora de Gas del Sur
TGS
$4.53B
– –
-3,955
Closed -$122K
TGT icon
10145
Target
TGT
$63.4B
– –
-40,901
Closed -$4.61M
THC icon
10146
Tenet Healthcare
THC
$16.7B
– –
-289
Closed -$60.9K
THFF icon
10147
First Financial Corp
THFF
$908M
– –
-2
Closed -$120
THFF icon
10148
PUT
First Financial Corp
THFF
$908M
– –
-800
Closed -$48.3K
THRM icon
10149
CALL
Gentherm
THRM
$1.09B
– –
-100
Closed -$3.64K
THS
10150
PUT
DELISTED
Treehouse Foods
THS
– –
-2,300
Closed -$102
404 405
406
407 408

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Simplex Trading's Q1 2026 Portfolio in Review

As of Q1 2026, Simplex Trading held 10,500 positions worth $149B, down 16% from $177B the previous quarter. Its ten largest holdings account for 51% of the portfolio.

Simplex Trading withdrew a net $18.1B in Q1 2026, closing 1,574 positions and reducing 3,926 holdings. Its most notable exit was Direxion Daily Semiconductor Bull 3X ETF, an estimated $52M position sold in full.

By sector, the portfolio is most concentrated in Technology at 0.62% of assets, up from 0.59% a quarter earlier, followed by Communication Services and Consumer Discretionary.

Against the trend, Simplex Trading opened a new position in Amazon worth $159M.

  • Simplex Trading's largest Q1 2026 buy was Amazon: 764,884 shares worth $159M.
  • Simplex Trading added most to NVIDIA in Q1 2026, an estimated $141M increase.
  • Simplex Trading's biggest Q1 2026 reduction was Apple, cutting an estimated $174M.
  • Simplex Trading fully exited Direxion Daily Semiconductor Bull 3X ETF in Q1 2026, selling an estimated $52M.
  • Simplex Trading's ten largest holdings make up 51% of its $149B portfolio in Q1 2026.
  • Simplex Trading opened 2,156 new positions and closed 1,574 in Q1 2026.
  • Simplex Trading's portfolio value fell 16% quarter-over-quarter to $149B.

Based on Simplex Trading's 13F filing for Q1 2026, filed 14 May 2026.