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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
+12.69%
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
$73.5B
AUM Growth
+$10.8B
Cap. Flow
-$1.16B
Cap. Flow %
-1.58%
Top 10 Hldgs %
42.78%
Holding
9,056
New
1,403
Increased
3,135
Reduced
3,122
Closed
1,191

Top Buys

Rank Stock Value
1
AMZN icon
Amazon
AMZN
+$102M
2
TSM icon
TSMC
TSM
+$27.8M
3
JPM icon
JPMorgan Chase
JPM
+$22.4M
4
BA icon
Boeing
BA
+$19.4M
5
XOM icon
ExxonMobil
XOM
+$14.7M

Top Sells

Rank Stock Value
1
GLD icon
SPDR Gold Trust
GLD
+$95.5M
2
QQQ icon
Invesco QQQ Trust
QQQ
+$79.6M
3
TSLA icon
Tesla
TSLA
+$75.3M
4
NVDA icon
NVIDIA
NVDA
+$51.6M
5
EFA icon
iShares MSCI EAFE ETF
EFA
+$40.5M

Sector Composition

Rank Sector Weight
1 Consumer Discretionary 0.53%
2 Technology 0.4%
3 Healthcare 0.22%
4 Financials 0.21%
5 Communication Services 0.18%
Name Market Value Portfolio Weight Shares or Principal Change
in Stake 		Capital Flow
MRNA icon
8201
PUT
Moderna
MRNA
$22.6B
– –
-5,573
Closed -$35.8M
MRSN
8202
DELISTED
Mersana Therapeutics
MRSN
– –
-71
Closed -$35.9K
MSEX icon
8203
Middlesex Water
MSEX
$1.05B
– –
-397
Closed -$26K
MSEX icon
8204
PUT
Middlesex Water
MSEX
$1.05B
– –
-10
Closed -$67K
MSGS icon
8205
Madison Square Garden
MSGS
$9.49B
$0 ﹤0.01%
1,945
+1,508
+345% +$237K
MSM icon
8206
MSC Industrial Direct
MSM
$7.03B
– –
-300
Closed -$19.9K
MSTR icon
8207
CALL
Strategy Inc
MSTR
$34.2B
– –
-110
Closed -$130K
MSTR icon
8208
Strategy Inc
MSTR
$34.2B
$0 ﹤0.01%
81,570
+80,870
+11,553% +$1.09M
MSTR icon
8209
PUT
Strategy Inc
MSTR
$34.2B
– –
-20
Closed -$23K
MTD icon
8210
Mettler-Toledo International
MTD
$26.9B
– –
-257
Closed -$238K
MTDR icon
8211
Matador Resources
MTDR
$6.42B
– –
-55,103
Closed -$493K
MTN icon
8212
Vail Resorts
MTN
$5.13B
– –
-2,815
Closed -$580K
MTUM icon
8213
iShares MSCI USA Momentum Factor ETF
MTUM
$26.2B
– –
-1,131
Closed -$148K
MTX icon
8214
Minerals Technologies
MTX
$2.27B
– –
-126
Closed -$6.23K
MTZ icon
8215
MasTec
MTZ
$28.4B
– –
-1,325
Closed -$57K
MU icon
8216
Micron Technology
MU
$1.12T
$0 ﹤0.01%
+100,596
New +$4.87M
MWA icon
8217
Mueller Water Products
MWA
$3.89B
– –
-747
Closed -$7.79K
MYE icon
8218
CALL
Myers Industries
MYE
$1.16B
– –
-7
Closed -$10K
MYE icon
8219
Myers Industries
MYE
$1.16B
– –
-2,955
Closed -$42K
MZZ icon
8220
ProShares UltraShort MidCap400
MZZ
$2.5M
– –
-193
Closed -$9K
NAAS
8221
NaaS Technology Inc
NAAS
$37.1M
– –
0
– –
NAIL icon
8222
Direxion Daily Homebuilders & Supplies Bull 3X ETF
NAIL
$537M
$0 ﹤0.01%
8,171
-9,361
-53% -$406K
NCTY
8223
The9 Ltd
NCTY
$56.7M
– –
-2
Closed -$133
NCTY
8224
PUT
The9 Ltd
NCTY
$56.7M
– –
0
– -$3K
NDLS icon
8225
PUT
Noodles & Co
NDLS
$72.8M
– –
-5
Closed -$24K
327 328
329
330 331

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Simplex Trading's Q3 2020 Portfolio in Review

As of Q3 2020, Simplex Trading held 9,056 positions worth $73.5B, up 17% from $62.7B the previous quarter. Its ten largest holdings account for 43% of the portfolio.

Simplex Trading's Q3 2020 filing shows 1,403 new, 3,135 increased, 3,122 reduced and 1,191 closed positions. Its largest new stake was Goldman Sachs: 60,397 shares worth $12.1M. The largest sale was SPDR Gold Trust, an estimated $95.5M.

By sector, the portfolio is most concentrated in Consumer Discretionary at 0.53% of assets, up from 0.47% a quarter earlier, followed by Technology and Healthcare.

  • Simplex Trading's largest Q3 2020 buy was Goldman Sachs: 60,397 shares worth $12.1M.
  • Simplex Trading added most to Amazon in Q3 2020, an estimated $102M increase.
  • Simplex Trading's biggest Q3 2020 reduction was SPDR Gold Trust, cutting an estimated $95.5M.
  • Simplex Trading fully exited iShares MSCI EAFE ETF in Q3 2020, selling an estimated $40.5M.
  • Simplex Trading's ten largest holdings make up 43% of its $73.5B portfolio in Q3 2020.
  • Simplex Trading opened 1,403 new positions and closed 1,191 in Q3 2020.
  • Simplex Trading's portfolio value rose 17% quarter-over-quarter to $73.5B.

Based on Simplex Trading's 13F filing for Q3 2020, filed 14 Oct 2020.