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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
+3.1%
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
$149B
AUM Growth
-$28.3B
Cap. Flow
-$294M
Cap. Flow %
-0.2%
Top 10 Hldgs %
51.08%
Holding
10,500
New
2,157
Increased
2,651
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 Miscellaneous 98.3%
2 Technology 0.62%
3 Communication Services 0.22%
4 Consumer Discretionary 0.21%
5 Healthcare 0.2%
Name Market Value Portfolio Weight Shares or Principal Change
in Stake 		Capital Flow
DOMH icon
9301
Dominari Holdings
DOMH
$58.2M
– –
-1,030
Closed -$3.69K
DOUG icon
9302
CALL
Douglas Elliman
DOUG
$138M
– –
-40,100
Closed -$95K
DOV icon
9303
PUT
Dover
DOV
$25.5B
– –
-2,800
Closed -$547K
DPRO
9304
Draganfly
DPRO
$230M
– –
-28,357
Closed -$210K
DRD
9305
DRDGold
DRD
$2.13B
– –
-13,616
Closed -$453K
DRN icon
9306
Direxion Daily Real Estate Bull 3X ETF
DRN
$35.9M
– –
-772
Closed -$6.58K
DRS icon
9307
Leonardo DRS
DRS
$9.8B
– –
-5,310
Closed -$224K
DRTS icon
9308
Alpha Tau Medical
DRTS
$1.4B
– –
-911
Closed -$6.43K
DSGN icon
9309
CALL
Design Therapeutics
DSGN
$790M
– –
-600
Closed -$5.63K
DSGX icon
9310
CALL
Descartes Systems
DSGX
$6.8B
– –
-300
Closed -$26.3K
DSP icon
9311
Viant Technology
DSP
$258M
– –
-8,632
Closed -$95.4K
DT icon
9312
Dynatrace
DT
$16.6B
– –
-44,681
Closed -$1.71M
DTIL icon
9313
PUT
Precision BioSciences
DTIL
$171M
– –
-200
Closed -$832
DUK icon
9314
Duke Energy
DUK
$89B
– –
-623
Closed -$77.9K
DVAX
9315
CALL
DELISTED
Dynavax Technologies
DVAX
– –
-72,800
Closed -$1.12M
DVAX
9316
PUT
DELISTED
Dynavax Technologies
DVAX
– –
-38,500
Closed -$592K
DVYE icon
9317
iShares Emerging Markets Dividend ETF
DVYE
$1.19B
– –
-370
Closed -$11.5K
DXD icon
9318
ProShares UltraShort Dow 30
DXD
$43M
– –
-7,173
Closed -$147K
DXJ icon
9319
WisdomTree Japan Hedged Equity Fund
DXJ
$6.99B
– –
-430
Closed -$62K
DXLG icon
9320
CALL
Destination XL Group
DXLG
$25.3M
– –
-6,600
Closed -$6.07K
DYNF icon
9321
BlackRock US Equity Factor Rotation ETF
DYNF
$41.8B
– –
-95
Closed -$5.75K
EA
9322
DELISTED
Electronic Arts
EA
– –
-23,397
Closed -$4.72M
EAF icon
9323
GrafTech
EAF
$223M
– –
-7,697
Closed -$81.4K
EAF icon
9324
PUT
GrafTech
EAF
$223M
– –
-6,700
Closed -$104K
EB
9325
CALL
DELISTED
Eventbrite
EB
– –
-17,900
Closed -$79.7K
371 372
373
374 375

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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's Q1 2026 filing shows 2,157 new, 2,651 increased, 3,926 reduced and 1,574 closed positions. Its largest new stake was Amazon: 764,884 shares worth $159M. The largest sale was Apple, an estimated $174M.

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

  • 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 2,157 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.