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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
-4.08%
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
$127B
AUM Growth
+$5.5B
Cap. Flow
+$11.9B
Cap. Flow %
9.37%
Top 10 Hldgs %
44.01%
Holding
10,417
New
1,399
Increased
3,690
Reduced
3,364
Closed
1,719

Top Buys

Rank Stock Value
1
AMZN icon
Amazon
AMZN
+$113M
2
GLD icon
SPDR Gold Trust
GLD
+$68.6M
3
NVDA icon
NVIDIA
NVDA
+$63.4M
4
TLT icon
iShares 20+ Year Treasury Bond ETF
TLT
+$55.2M
5
AAPL icon
Apple
AAPL
+$54.9M

Top Sells

Rank Stock Value
1
NFLX icon
Netflix
NFLX
+$27.1M
2
QCOM icon
Qualcomm
QCOM
+$24.6M
3
DIS icon
Walt Disney
DIS
+$21.2M
4
AMD icon
Advanced Micro Devices
AMD
+$18.2M
5
SNOW icon
Snowflake
SNOW
+$16.1M

Sector Composition

Rank Sector Weight
1 Technology 0.44%
2 Consumer Discretionary 0.32%
3 Healthcare 0.22%
4 Financials 0.17%
5 Communication Services 0.15%
Name Market Value Portfolio Weight Shares or Principal Change
in Stake 		Capital Flow
GASS icon
9026
StealthGas
GASS
$328M
– –
-12,517
Closed -$60.8K
GB
9027
DELISTED
Global Blue Group Holding
GB
– –
-454
Closed -$2.41K
GBCI icon
9028
Glacier Bancorp
GBCI
$6.54B
– –
-136
Closed -$4.21K
GBDC icon
9029
Golub Capital BDC
GBDC
$3.33B
– –
-2,456
Closed -$34.8K
GBIO
9030
PUT
DELISTED
Generation Bio
GBIO
– –
-80
Closed -$4K
GBX icon
9031
The Greenbrier Companies
GBX
$1.61B
– –
-6,774
Closed -$291K
GDDY icon
9032
GoDaddy
GDDY
$12.3B
– –
-16,422
Closed -$1.21M
GDEN
9033
CALL
DELISTED
Golden Entertainment
GDEN
– –
-8,300
Closed -$346K
GDX icon
9034
VanEck Gold Miners ETF
GDX
$23B
– –
-230,854
Closed -$6.81M
GEF icon
9035
Greif
GEF
$4.47B
– –
-5,230
Closed -$371K
GENC icon
9036
Gencor Industries
GENC
$223M
– –
-6
Closed –
GETY icon
9037
Getty Images
GETY
$184M
– –
-80,772
Closed -$407K
GFL icon
9038
GFL Environmental
GFL
$14.3B
– –
-25,398
Closed -$872K
GFS icon
9039
GlobalFoundries
GFS
$29.4B
– –
-361
Closed -$21.4K
GGB icon
9040
Gerdau
GGB
$9.44B
– –
-5,264
Closed -$23.4K
GGR icon
9041
Gogoro
GGR
$70.3M
– –
-30
Closed -$1.82K
GHM icon
9042
CALL
Graham Corp
GHM
$1.22B
– –
-400
Closed -$5K
GIB icon
9043
PUT
CGI
GIB
$13.9B
– –
-100
Closed -$10K
GL icon
9044
Globe Life
GL
$13.5B
$0 ﹤0.01%
+2
New +$223
GL icon
9045
PUT
Globe Life
GL
$13.5B
– –
-500
Closed -$54K
GLP icon
9046
Global Partners
GLP
$1.64B
– –
-118
Closed -$3.78K
LKFT
9047
Lakefront Biotherapeutics American Depositary Shares
LKFT
$1.82B
– –
-1,355
Closed -$52.7K
GLPI icon
9048
Gaming and Leisure Properties
GLPI
$12.8B
– –
-7,692
Closed -$366K
GLRE icon
9049
CALL
Greenlight Captial
GLRE
$563M
– –
-3,000
Closed -$31K
GLRE icon
9050
Greenlight Captial
GLRE
$563M
– –
-16
Closed –
360 361
362
363 364

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Simplex Trading's Q3 2023 Portfolio in Review

As of Q3 2023, Simplex Trading held 10,417 positions worth $127B, up 4.5% from $122B the previous quarter. Its ten largest holdings account for 44% of the portfolio.

Simplex Trading deployed $11.9B of net new capital in Q3 2023, opening 1,399 new positions and adding to 3,690 existing holdings. Its largest new stake was Amazon: 841,102 shares worth $107M.

By sector, the portfolio is most concentrated in Technology at 0.44% of assets, up from 0.41% a quarter earlier, followed by Consumer Discretionary and Healthcare.

On the sell side, the largest reduction was Netflix, an estimated $27.1M trimmed.

  • Simplex Trading's largest Q3 2023 buy was Amazon: 841,102 shares worth $107M.
  • Simplex Trading added most to SPDR Gold Trust in Q3 2023, an estimated $68.6M increase.
  • Simplex Trading's biggest Q3 2023 reduction was Netflix, cutting an estimated $27.1M.
  • Simplex Trading fully exited Qualcomm in Q3 2023, selling an estimated $24.6M.
  • Simplex Trading's ten largest holdings make up 44% of its $127B portfolio in Q3 2023.
  • Simplex Trading opened 1,399 new positions and closed 1,719 in Q3 2023.
  • Simplex Trading's portfolio value rose 4.5% quarter-over-quarter to $127B.

Based on Simplex Trading's 13F filing for Q3 2023, filed 1 Nov 2023.