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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
+6.46%
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
$122B
AUM Growth
+$7.84B
Cap. Flow
-$3.39B
Cap. Flow %
-2.78%
Top 10 Hldgs %
42.57%
Holding
10,535
New
1,474
Increased
3,350
Reduced
3,913
Closed
1,517

Top Buys

Rank Stock Value
1
MSFT icon
Microsoft
MSFT
+$53.9M
2
TLT icon
iShares 20+ Year Treasury Bond ETF
TLT
+$52.9M
3
NVDA icon
NVIDIA
NVDA
+$47.1M
4
PYPL icon
PayPal
PYPL
+$41.7M
5
GOOG icon
Alphabet (Google) Class C
GOOG
+$28.4M

Top Sells

Rank Stock Value
1
AAPL icon
Apple
AAPL
+$51.4M
2
WMT icon
Walmart Inc
WMT
+$46.4M
3
OIH icon
VanEck Oil Services ETF
OIH
+$34.2M
4
ADBE icon
Adobe
ADBE
+$33.5M
5
SBUX icon
Starbucks
SBUX
+$26.8M

Sector Composition

Rank Sector Weight
1 Technology 0.41%
2 Healthcare 0.21%
3 Consumer Discretionary 0.21%
4 Communication Services 0.2%
5 Financials 0.15%
Name Market Value Portfolio Weight Shares or Principal Change
in Stake 		Capital Flow
DMAC icon
9151
DiaMedica Therapeutics
DMAC
$371M
$0 ﹤0.01%
202
-3,324
-94% -$8.07K
DMRC icon
9152
Digimarc Corp
DMRC
$133M
– –
-20,626
Closed -$507K
DNB
9153
DELISTED
Dun & Bradstreet
DNB
– –
-253
Closed -$2.75K
DNLI icon
9154
Denali Therapeutics
DNLI
$3.64B
– –
-6,293
Closed -$177K
DNLI icon
9155
PUT
Denali Therapeutics
DNLI
$3.64B
– –
-2,300
Closed -$52K
DNOW icon
9156
PUT
DNOW Inc
DNOW
$2.64B
– –
-100
Closed -$1K
DNTH icon
9157
Dianthus Therapeutics
DNTH
$5.69B
$0 ﹤0.01%
1
-202
-100% -$2.3K
DNTH icon
9158
PUT
Dianthus Therapeutics
DNTH
$5.69B
– –
-363
Closed -$4K
DOG
9159
ProShares Short Dow30
DOG
$96.7M
– –
-729
Closed -$24K
DOGZ icon
9160
Dogness International Corp
DOGZ
$15.1M
$0 ﹤0.01%
+8
New +$127
DOO
9161
Bombardier Recreational Products
DOO
$4.49B
– –
-226
Closed -$17K
DOO
9162
PUT
Bombardier Recreational Products
DOO
$4.49B
– –
-2,500
Closed -$195K
DPST icon
9163
Direxion Daily Regional Banks Bull 3X ETF
DPST
$455M
– –
-10,887
Closed -$839K
DRI icon
9164
Darden Restaurants
DRI
$22.5B
– –
-9,390
Closed -$1.48M
DRIO icon
9165
CALL
DarioHealth
DRIO
$53.5M
– –
-320
Closed -$26K
DSGN icon
9166
CALL
Design Therapeutics
DSGN
$753M
– –
-900
Closed -$5K
DSX icon
9167
CALL
Diana Shipping
DSX
$284M
– –
-15,294
Closed -$39K
DUG icon
9168
ProShares UltraShort Energy
DUG
$19.7M
– –
-2,543
Closed -$132K
DUOL icon
9169
Duolingo
DUOL
$5.69B
– –
-19,618
Closed -$2.81M
DXLG icon
9170
Destination XL Group
DXLG
$34.6M
– –
-17,130
Closed -$80.5K
DY icon
9171
Dycom Industries
DY
$13.1B
– –
-429
Closed -$42.4K
EAF icon
9172
GrafTech
EAF
$192M
– –
-1,032
Closed -$48K
EB
9173
DELISTED
Eventbrite
EB
– –
-1,908
Closed -$15K
EBC icon
9174
Eastern Bankshares
EBC
$5B
– –
-569
Closed -$6.74K
ECL icon
9175
Ecolab
ECL
$75.5B
– –
-4,850
Closed -$835K
365 366
367
368 369

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Simplex Trading's Q2 2023 Portfolio in Review

As of Q2 2023, Simplex Trading held 10,535 positions worth $122B, up 6.9% from $114B the previous quarter. Its ten largest holdings account for 43% of the portfolio.

Simplex Trading's Q2 2023 filing shows 1,474 new, 3,350 increased, 3,913 reduced and 1,517 closed positions. Its largest new stake was Microsoft: 171,935 shares worth $58.5M. The largest sale was Apple, an estimated $51.4M.

By sector, the portfolio is most concentrated in Technology at 0.41% of assets, down from 0.42% a quarter earlier, followed by Healthcare and Consumer Discretionary.

  • Simplex Trading's largest Q2 2023 buy was Microsoft: 171,935 shares worth $58.5M.
  • Simplex Trading added most to iShares 20+ Year Treasury Bond ETF in Q2 2023, an estimated $52.9M increase.
  • Simplex Trading's biggest Q2 2023 reduction was Adobe, cutting an estimated $33.5M.
  • Simplex Trading fully exited Apple in Q2 2023, selling an estimated $51.4M.
  • Simplex Trading's ten largest holdings make up 43% of its $122B portfolio in Q2 2023.
  • Simplex Trading opened 1,474 new positions and closed 1,517 in Q2 2023.
  • Simplex Trading's portfolio value rose 6.9% quarter-over-quarter to $122B.

Based on Simplex Trading's 13F filing for Q2 2023, filed 4 Aug 2023.