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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
DDL
8851
CALL
Dingdong
DDL
$529M
– –
-1,300
Closed -$4K
DE icon
8852
Deere & Co
DE
$170B
– –
-7,810
Closed -$3.22M
DEM icon
8853
WisdomTree Emerging Markets High Dividend Fund
DEM
$3.88B
– –
-109
Closed -$4K
DFAU icon
8854
CALL
Dimensional US Core Equity Market ETF
DFAU
$12.3B
– –
-700
Closed -$17K
DFH icon
8855
Dream Finders Homes
DFH
$1.46B
– –
-21
Closed -$545
DFLV icon
8856
Dimensional US Large Cap Value ETF
DFLV
$6.69B
$0 ﹤0.01%
+23
New +$590
DGII icon
8857
Digi International
DGII
$2.52B
– –
-592
Closed -$20.3K
DGII icon
8858
PUT
Digi International
DGII
$2.52B
– –
-1,000
Closed -$39K
DH icon
8859
CALL
Definitive Healthcare
DH
$72.1M
– –
-1,000
Closed -$11K
DH icon
8860
Definitive Healthcare
DH
$72.1M
$0 ﹤0.01%
57
-1,735
-97% -$17.4K
DH icon
8861
PUT
Definitive Healthcare
DH
$72.1M
– –
-6,400
Closed -$70K
DHI icon
8862
D.R. Horton
DHI
$41B
– –
-121,138
Closed -$14.5M
DIBS icon
8863
1stdibs.com
DIBS
$145M
$0 ﹤0.01%
+51
New +$203
DIOD icon
8864
CALL
Diodes
DIOD
$4B
– –
-100
Closed -$9K
DIOD icon
8865
Diodes
DIOD
$4B
– –
-351
Closed -$29.5K
DIS icon
8866
Walt Disney
DIS
$165B
– –
-248,676
Closed -$21.2M
DIV icon
8867
Global X SuperDividend US ETF
DIV
$787M
– –
-1,440
Closed -$24K
DKNG icon
8868
DraftKings
DKNG
$11.4B
– –
-39,535
Closed -$1.17M
DLB icon
8869
Dolby
DLB
$4.72B
– –
-6,309
Closed -$529K
DLNG icon
8870
CALL
Dynagas LNG Partners
DLNG
$131M
– –
-5,100
Closed -$12K
DMAC icon
8871
CALL
DiaMedica Therapeutics
DMAC
$363M
– –
-5,300
Closed -$22K
DNB
8872
PUT
DELISTED
Dun & Bradstreet
DNB
– –
-200
Closed -$2K
DNOW icon
8873
DNOW Inc
DNOW
$2.63B
– –
-168
Closed -$1.88K
DNTH icon
8874
Dianthus Therapeutics
DNTH
$5.68B
– –
-1
Closed –
DOCN icon
8875
DigitalOcean
DOCN
$14.4B
– –
-46,117
Closed -$1.63M
353 354
355
356 357

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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.