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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
SLAB icon
10051
Silicon Laboratories
SLAB
$7.17B
– –
-234
Closed -$42.9K
SLF icon
10052
PUT
Sun Life Financial
SLF
$44.9B
– –
-900
Closed -$56.2K
SLI
10053
Standard Lithium
SLI
$524M
– –
-1,700
Closed -$7.61K
SLM icon
10054
SLM Corp
SLM
$4.78B
– –
-5,057
Closed -$120K
SLP icon
10055
CALL
Simulations Plus
SLP
$368M
– –
-100
Closed -$1.82K
SLQT icon
10056
SelectQuote
SLQT
$126M
– –
-7,617
Closed -$8K
SLRC icon
10057
PUT
SLR Investment Corp
SLRC
$705M
– –
-1,000
Closed -$15.5K
SLYG icon
10058
State Street SPDR S&P 600 Small Cap Growth ETF
SLYG
$5.09B
– –
-242
Closed -$22.8K
SMG icon
10059
ScottsMiracle-Gro
SMG
$4.03B
– –
-4,433
Closed -$287K
SMHI icon
10060
SEACOR Marine Holdings
SMHI
$209M
– –
-814
Closed -$5.73K
SMLR
10061
CALL
DELISTED
Semler Scientific
SMLR
– –
-23,400
Closed -$358K
SMLR
10062
DELISTED
Semler Scientific
SMLR
– –
-20,575
Closed -$315K
SMLR
10063
PUT
DELISTED
Semler Scientific
SMLR
– –
-31,200
Closed -$477K
SMP icon
10064
PUT
Standard Motor Products
SMP
$842M
– –
-1,000
Closed -$36.9K
SMRT icon
10065
CALL
SmartRent
SMRT
$192M
– –
-28,100
Closed -$56.8K
SMSI icon
10066
CALL
Smith Micro Software
SMSI
$14.2M
– –
-4,400
Closed -$11.9K
SMTC icon
10067
Semtech
SMTC
$12.8B
– –
-9,936
Closed -$817K
SN icon
10068
PUT
SharkNinja
SN
$21.6B
– –
-22,700
Closed -$2.54M
SNBR
10069
DELISTED
Sleep Number
SNBR
– –
-41,233
Closed -$310K
SNDR icon
10070
Schneider National
SNDR
$6.56B
– –
-15,923
Closed -$441K
SNEX icon
10071
CALL
StoneX
SNEX
$8.41B
– –
-450
Closed -$19K
SNN icon
10072
CALL
Smith & Nephew
SNN
$12.7B
– –
-200
Closed -$6.56K
SNV
10073
CALL
DELISTED
Synovus
SNV
– –
-5,900
Closed -$295K
SNV
10074
PUT
DELISTED
Synovus
SNV
– –
-400
Closed -$20K
SON icon
10075
Sonoco
SON
$5.41B
– –
-18,165
Closed -$936K
401 402
403
404 405

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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.