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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
+33.36%
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
$62.7B
AUM Growth
+$5.97B
Cap. Flow
-$480M
Cap. Flow %
-0.77%
Top 10 Hldgs %
44.28%
Holding
8,917
New
1,290
Increased
3,427
Reduced
2,723
Closed
1,278

Top Buys

Rank Stock Value
1
QQQ icon
Invesco QQQ Trust
QQQ
+$77.3M
2
GLD icon
SPDR Gold Trust
GLD
+$73.2M
3
EFA icon
iShares MSCI EAFE ETF
EFA
+$38.5M
4
NFLX icon
Netflix
NFLX
+$38.4M
5
NVDA icon
NVIDIA
NVDA
+$36.3M

Top Sells

Rank Stock Value
1
AAPL icon
Apple
AAPL
+$55.9M
2
VXX icon
iPath Series B S&P 500 VIX Short-Term Futures ETN
VXX
+$28.3M
3
DIA icon
State Street SPDR Dow Jones Industrial Average ETF Trust
DIA
+$23.1M
4
SPY icon
State Street SPDR S&P 500 ETF Trust
SPY
+$23.1M
5
ADBE icon
Adobe
ADBE
+$22M

Sector Composition

Rank Sector Weight
1 Technology 0.49%
2 Consumer Discretionary 0.47%
3 Communication Services 0.34%
4 Healthcare 0.26%
5 Financials 0.23%
Name Market Value Portfolio Weight Shares or Principal Change
in Stake 		Capital Flow
EE
7476
DELISTED
El Paso Electric Company
EE
$1K ﹤0.01%
+20
New +$1.35K
A icon
7477
Agilent Technologies
A
$39.1B
– –
-24,221
Closed -$1.98M
AAON icon
7478
PUT
Aaon
AAON
$8.41B
– –
-119
Closed -$381K
AAT
7479
CALL
American Assets Trust
AAT
$1.49B
– –
-8
Closed -$20K
ABT icon
7480
Abbott
ABT
$180B
– –
-67,267
Closed -$6.08M
ABUS icon
7481
PUT
Arbutus Biopharma
ABUS
$865M
– –
-13
Closed -$1K
ACA icon
7482
Arcosa
ACA
$7.12B
– –
-1,225
Closed -$47.1K
ACAD icon
7483
CALL
Acadia Pharmaceuticals
ACAD
$4.25B
– –
-260
Closed -$1.1M
ACAD icon
7484
Acadia Pharmaceuticals
ACAD
$4.25B
– –
-10,834
Closed -$520K
ACAD icon
7485
PUT
Acadia Pharmaceuticals
ACAD
$4.25B
– –
-1,063
Closed -$4.49M
ACCO icon
7486
Acco Brands
ACCO
$369M
– –
-209
Closed -$1.3K
ACCO icon
7487
PUT
Acco Brands
ACCO
$369M
– –
-100
Closed -$50K
ACET icon
7488
Adicet Bio
ACET
$72.8M
– –
-276
Closed -$54.2K
ACET icon
7489
PUT
Adicet Bio
ACET
$72.8M
– –
-3
Closed -$32K
ACHC icon
7490
Acadia Healthcare
ACHC
$3.17B
– –
-19,913
Closed -$497K
ACRS icon
7491
CALL
Aclaris Therapeutics
ACRS
$730M
– –
-60
Closed -$6K
ACRS icon
7492
Aclaris Therapeutics
ACRS
$730M
$0 ﹤0.01%
+515
New +$690
ACRS icon
7493
PUT
Aclaris Therapeutics
ACRS
$730M
– –
-10
Closed -$1K
ADBE icon
7494
Adobe
ADBE
$89.5B
– –
-59,377
Closed -$22M
ADC icon
7495
Agree Realty
ADC
$9.68B
– –
-235
Closed -$14K
ADC icon
7496
PUT
Agree Realty
ADC
$9.68B
– –
-4
Closed -$24K
ADEA icon
7497
Adeia
ADEA
$2.86B
$0 ﹤0.01%
+12,368
New +$46.8K
ADEA icon
7498
PUT
Adeia
ADEA
$2.86B
– –
-26
Closed -$9K
ADI icon
7499
Analog Devices
ADI
$181B
– –
-14,508
Closed -$1.59M
ADP icon
7500
Automatic Data Processing
ADP
$100B
– –
-4,448
Closed -$637K
298 299
300
301 302

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Simplex Trading's Q2 2020 Portfolio in Review

As of Q2 2020, Simplex Trading held 8,917 positions worth $62.7B, up 11% from $56.7B the previous quarter. Its ten largest holdings account for 44% of the portfolio.

Simplex Trading's Q2 2020 filing shows 1,290 new, 3,427 increased, 2,723 reduced and 1,278 closed positions. Its largest new stake was iShares MSCI EAFE ETF: 665,841 shares worth $40.5M. The largest sale was Apple, an estimated $55.9M.

By sector, the portfolio is most concentrated in Technology at 0.49% of assets, up from 0.49% a quarter earlier, followed by Consumer Discretionary and Communication Services.

  • Simplex Trading's largest Q2 2020 buy was iShares MSCI EAFE ETF: 665,841 shares worth $40.5M.
  • Simplex Trading added most to Invesco QQQ Trust in Q2 2020, an estimated $77.3M increase.
  • Simplex Trading's biggest Q2 2020 reduction was Apple, cutting an estimated $55.9M.
  • Simplex Trading fully exited Adobe in Q2 2020, selling an estimated $22M.
  • Simplex Trading's ten largest holdings make up 44% of its $62.7B portfolio in Q2 2020.
  • Simplex Trading opened 1,290 new positions and closed 1,278 in Q2 2020.
  • Simplex Trading's portfolio value rose 11% quarter-over-quarter to $62.7B.

Based on Simplex Trading's 13F filing for Q2 2020, filed 13 Jul 2020.