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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
DOGZ icon
8876
Dogness International Corp
DOGZ
$13.7M
$0 ﹤0.01%
3
-5
-63% -$66
DOX icon
8877
CALL
Amdocs
DOX
$5.53B
– –
-600
Closed -$59K
DOYU
8878
DouYu International Holdings
DOYU
$136M
$0 ﹤0.01%
24
-2,431
-99% -$25.5K
DPRO
8879
Draganfly
DPRO
$156M
– –
-78
Closed -$1.87K
DPZ icon
8880
Domino's
DPZ
$11B
– –
-7,068
Closed -$2.72M
DRIO icon
8881
DarioHealth
DRIO
$57M
$0 ﹤0.01%
1
-32
-97% -$2.16K
DRIO icon
8882
PUT
DarioHealth
DRIO
$57M
– –
-15
Closed -$1K
DRN icon
8883
Direxion Daily Real Estate Bull 3X ETF
DRN
$51.4M
– –
-4,382
Closed -$41K
DRRX
8884
DELISTED
DURECT Corp
DRRX
– –
-28,727
Closed -$97.9K
DRV icon
8885
Direxion Daily Real Estate Bear 3X ETF
DRV
$25M
– –
-1,158
Closed -$52K
DSGN icon
8886
Design Therapeutics
DSGN
$736M
$0 ﹤0.01%
265
-117
-31% -$546
DSGX icon
8887
PUT
Descartes Systems
DSGX
$5.84B
– –
-100
Closed -$8K
DTIL icon
8888
Precision BioSciences
DTIL
$188M
$0 ﹤0.01%
+3
New +$46
DUK icon
8889
Duke Energy
DUK
$102B
– –
-28,917
Closed -$2.65M
DUG icon
8890
ProShares UltraShort Energy
DUG
$19.7M
$0 ﹤0.01%
+19
New +$859
DVA icon
8891
DaVita
DVA
$15.1B
– –
-432
Closed -$44.1K
DVY icon
8892
iShares Select Dividend ETF
DVY
$24B
– –
-17,407
Closed -$1.97M
DX
8893
Dynex Capital
DX
$2.99B
– –
-23,984
Closed -$304K
DXD icon
8894
ProShares UltraShort Dow 30
DXD
$44.8M
– –
-2,586
Closed -$104K
DXLG icon
8895
PUT
Destination XL Group
DXLG
$34.7M
– –
-1,000
Closed -$4K
DYN icon
8896
CALL
Dyne Therapeutics
DYN
$4.04B
– –
-200
Closed -$2K
EARN
8897
PUT
Ellington Residential Mortgage REIT
EARN
$165M
– –
-1,000
Closed -$7K
EATZ
8898
DELISTED
AdvisorShares Restaurant ETF
EATZ
– –
-132
Closed -$2K
ECVT icon
8899
Ecovyst
ECVT
$1.36B
– –
-200
Closed -$2K
ECVT icon
8900
PUT
Ecovyst
ECVT
$1.36B
– –
-200
Closed -$2K
354 355
356
357 358

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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.