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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
FTV icon
9276
Fortive
FTV
$19B
– –
-15,933
Closed -$805K
FWONK icon
9277
Liberty Media Series C
FWONK
$24.1B
– –
-1,709
Closed -$123K
FWRD icon
9278
Forward Air
FWRD
$488M
– –
-24
Closed -$2K
FXP icon
9279
ProShares UltraShort FTSE China 50 of ProShares Trust
FXP
$6.29M
– –
-100
Closed -$6K
FXU icon
9280
First Trust Utilities AlphaDEX Fund
FXU
$839M
– –
-228
Closed -$7K
GABC icon
9281
PUT
German American Bancorp
GABC
$1.82B
– –
-1,600
Closed -$53K
GAMB
9282
DELISTED
Gambling.com
GAMB
– –
-1,940
Closed -$19.5K
GAMB
9283
PUT
DELISTED
Gambling.com
GAMB
– –
-1,800
Closed -$17K
GAME icon
9284
GameSquare
GAME
$38.1M
– –
-573
Closed -$3K
GAME icon
9285
PUT
GameSquare
GAME
$38.1M
– –
-475
Closed -$2K
GBTG icon
9286
American Express Global Business Travel
GBTG
$4.92B
– –
-56
Closed –
GCT icon
9287
GigaCloud Technology
GCT
$1.36B
– –
-117
Closed –
GDOT icon
9288
CALL
Green Dot
GDOT
$753M
– –
-300
Closed -$5K
GDOT icon
9289
Green Dot
GDOT
$753M
– –
-11,809
Closed -$209K
GDYN icon
9290
CALL
Grid Dynamics Holdings
GDYN
$481M
– –
-12,300
Closed -$140K
GDYN icon
9291
PUT
Grid Dynamics Holdings
GDYN
$481M
– –
-400
Closed -$4K
GE icon
9292
GE Aerospace
GE
$366B
– –
-2,506
Closed -$203K
GEHC icon
9293
GE HealthCare
GEHC
$27.9B
– –
-666
Closed -$53.1K
GENC icon
9294
Gencor Industries
GENC
$224M
$0 ﹤0.01%
+6
New +$86
GEO icon
9295
The GEO Group
GEO
$4.14B
– –
-93,746
Closed -$727K
GEOS icon
9296
Geospace Technologies
GEOS
$93M
– –
-2,451
Closed -$19.5K
GERN icon
9297
Geron
GERN
$917M
– –
-77,387
Closed -$220K
GFF icon
9298
Griffon
GFF
$4.17B
– –
-4,535
Closed -$149K
GFL icon
9299
PUT
GFL Environmental
GFL
$14.3B
– –
-75,700
Closed -$2.61M
GH icon
9300
Guardant Health
GH
$19.7B
– –
-400
Closed -$11.5K
370 371
372
373 374

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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.