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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
SOND
10076
CALL
DELISTED
Sonder
SOND
– –
-100
Closed -$1
SOND
10077
DELISTED
Sonder
SOND
– –
-12,590
Closed -$125
SOND
10078
PUT
DELISTED
Sonder
SOND
– –
-4,900
Closed -$49
SONO icon
10079
Sonos
SONO
$1.76B
– –
-36,883
Closed -$557K
SOPH icon
10080
SOPHiA GENETICS
SOPH
$545M
– –
-31
Closed -$151
SOUN icon
10081
SoundHound AI
SOUN
$2.85B
– –
-200
Closed -$1.73K
SOXL icon
10082
Direxion Daily Semiconductor Bull 3X ETF
SOXL
$21.6B
– –
-1,236,517
Closed -$52M
SPH icon
10083
Suburban Propane Partners
SPH
$1.2B
– –
-1,630
Closed -$32.5K
SPNS
10084
CALL
DELISTED
Sapiens International
SPNS
– –
-10,200
Closed -$31.9K
SPNS
10085
DELISTED
Sapiens International
SPNS
– –
-100
Closed –
SPNS
10086
PUT
DELISTED
Sapiens International
SPNS
– –
-2,700
Closed -$772
SPNT icon
10087
SiriusPoint
SPNT
$2.9B
– –
-370
Closed -$8.1K
SPSC icon
10088
SPS Commerce
SPSC
$2.28B
– –
-84
Closed -$6.05K
SPRX icon
10089
Spear Alpha ETF
SPRX
$223M
– –
-19,523
Closed -$752K
SPTS icon
10090
State Street SPDR Portfolio Short Term Treasury ETF
SPTS
$6.07B
– –
-400
Closed -$11.7K
SPXT icon
10091
ProShares S&P 500 ex-Technology ETF
SPXT
$273M
– –
-6
Closed -$623
SR icon
10092
PUT
Spire
SR
$4.76B
– –
-800
Closed -$66.2K
SRCE icon
10093
1st Source
SRCE
$2.01B
– –
-19
Closed -$1.28K
SRL icon
10094
CALL
Scully Royalty
SRL
$79.6M
– –
-100
Closed -$855
SRI icon
10095
CALL
Stoneridge
SRI
$199M
– –
-500
Closed -$2.9K
SRI icon
10096
PUT
Stoneridge
SRI
$199M
– –
-300
Closed -$1.74K
TRON
10097
Tron Inc
TRON
$693M
– –
-35,851
Closed -$56.4K
SRS icon
10098
ProShares UltraShort Real Estate
SRS
$15.2M
– –
-1,577
Closed -$77.8K
SRTS icon
10099
Sensus Healthcare
SRTS
$51M
– –
-5,938
Closed -$26.4K
SRTY icon
10100
ProShares UltraPro Short Russell2000
SRTY
$72.2M
– –
-502
Closed -$21.3K
402 403
404
405 406

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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.