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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
SIFY
9701
Sify Technologies
SIFY
$1.03B
– –
-1,069
Closed -$13.7K
SIMO icon
9702
Silicon Motion
SIMO
$9.44B
– –
-1,386
Closed -$78.8K
SIRI icon
9703
SiriusXM
SIRI
$9.84B
– –
-1,120
Closed -$52.1K
SKIL icon
9704
CALL
Skillsoft
SKIL
$55.4M
– –
-120
Closed -$2K
SKIL icon
9705
Skillsoft
SKIL
$55.4M
– –
-16
Closed -$405
SKM icon
9706
SK Telecom
SKM
$13.4B
– –
-15,127
Closed -$303K
SKM icon
9707
PUT
SK Telecom
SKM
$13.4B
– –
-28,400
Closed -$554K
SKYT icon
9708
SkyWater Technology
SKYT
$1.49B
– –
-6,381
Closed -$48.4K
SKYX icon
9709
CALL
SKYX Platforms
SKYX
$161M
– –
-5,800
Closed -$15K
SKYX icon
9710
SKYX Platforms
SKYX
$161M
$0 ﹤0.01%
606
-62,690
-99% -$120K
SKYX icon
9711
PUT
SKYX Platforms
SKYX
$161M
– –
-300,400
Closed -$799K
SLDB icon
9712
Solid Biosciences
SLDB
$789M
$0 ﹤0.01%
+27
New +$105
SLE icon
9713
Super League Enterprise
SLE
$4.46M
– –
0
– –
SLG icon
9714
SL Green Realty
SLG
$3.77B
– –
-340
Closed -$12.2K
SLM icon
9715
SLM Corp
SLM
$4.67B
– –
-17,912
Closed -$269K
SLNH icon
9716
Soluna Holdings
SLNH
$202M
$0 ﹤0.01%
96
-52
-35% -$324
SLRN
9717
DELISTED
ACELYRIN
SLRN
– –
-3,511
Closed -$74.6K
SLVM icon
9718
Sylvamo
SLVM
$1.49B
– –
-120
Closed -$5.16K
SLYG icon
9719
State Street SPDR S&P 600 Small Cap Growth ETF
SLYG
$5.01B
– –
-104
Closed -$8K
SMMT icon
9720
Summit Therapeutics
SMMT
$11.8B
– –
-25,114
Closed -$47.9K
SMP icon
9721
CALL
Standard Motor Products
SMP
$852M
– –
-4,600
Closed -$172K
SMP icon
9722
PUT
Standard Motor Products
SMP
$852M
– –
-600
Closed -$22K
SMPL icon
9723
Simply Good Foods
SMPL
$905M
– –
-1,956
Closed -$70.4K
SNCR
9724
DELISTED
Synchronoss Technologies
SNCR
– –
-15
Closed –
SND icon
9725
Smart Sand
SND
$208M
– –
-7,014
Closed -$13.9K
387 388
389
390 391

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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.