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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
DENN
9276
CALL
DELISTED
Denny's
DENN
– –
-22,800
Closed -$142K
DENN
9277
PUT
DELISTED
Denny's
DENN
– –
-26,900
Closed -$167K
DERM icon
9278
Journey Medical
DERM
$196M
– –
-434
Closed -$3.37K
DES icon
9279
WisdomTree US SmallCap Dividend Fund
DES
$2.2B
– –
-1
Closed -$33
DFEN icon
9280
Direxion Daily Aerospace & Defense Bull 3X ETF
DFEN
$345M
– –
-6,025
Closed -$385K
DFH icon
9281
CALL
Dream Finders Homes
DFH
$1.4B
– –
-200
Closed -$3.42K
DG icon
9282
Dollar General
DG
$26.5B
– –
-9,674
Closed -$1.38M
DGII icon
9283
Digi International
DGII
$2.5B
– –
-127
Closed -$5.94K
DGRO icon
9284
iShares Core Dividend Growth ETF
DGRO
$42.2B
– –
-90
Closed -$6.25K
DGX icon
9285
PUT
Quest Diagnostics
DGX
$23.2B
– –
-7,400
Closed -$1.28M
DHC
9286
CALL
Diversified Healthcare Trust
DHC
$2.25B
– –
-10,300
Closed -$50K
DHR icon
9287
Danaher
DHR
$126B
– –
-13,157
Closed -$2.8M
DIBS icon
9288
CALL
1stdibs.com
DIBS
$162M
– –
-100
Closed -$599
DIBS icon
9289
1stdibs.com
DIBS
$162M
– –
-1,191
Closed -$7.13K
DIS icon
9290
Walt Disney
DIS
$166B
– –
-25,931
Closed -$2.74M
DKL icon
9291
PUT
Delek Logistics
DKL
$3.04B
– –
-200
Closed -$8.92K
DKNG icon
9292
DraftKings
DKNG
$11.3B
– –
-20,210
Closed -$548K
DLNG icon
9293
CALL
Dynagas LNG Partners
DLNG
$134M
– –
-29,200
Closed -$110K
DMAC icon
9294
DiaMedica Therapeutics
DMAC
$374M
– –
-12,132
Closed -$96.1K
DMLP icon
9295
Dorchester Minerals
DMLP
$1.32B
– –
-1,686
Closed -$42.9K
DNLI icon
9296
CALL
Denali Therapeutics
DNLI
$3.75B
– –
-51,700
Closed -$854K
DOC icon
9297
Healthpeak Properties
DOC
$15.3B
– –
-8,496
Closed -$146K
DOCU
9298
DocuSign
DOCU
$9.14B
– –
-3,820
Closed -$195K
DOLE icon
9299
CALL
Dole
DOLE
$1.36B
– –
-600
Closed -$8.99K
DOMH icon
9300
CALL
Dominari Holdings
DOMH
$64M
– –
-33,800
Closed -$167K
370 371
372
373 374

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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.