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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
+17.83%
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
$36B
AUM Growth
+$1.89B
Cap. Flow
-$586M
Cap. Flow %
-1.63%
Top 10 Hldgs %
34.84%
Holding
8,479
New
1,472
Increased
3,049
Reduced
2,419
Closed
1,324

Top Buys

Rank Stock Value
1
QQQ icon
Invesco QQQ Trust
QQQ
+$86.9M
2
DIS icon
Walt Disney
DIS
+$25.5M
3
BIDU icon
Baidu
BIDU
+$12.3M
4
GOOGL icon
Alphabet (Google) Class A
GOOGL
+$12.3M
5
RHT
Red Hat Inc
RHT
+$11.4M

Top Sells

Rank Stock Value
1
AMZN icon
Amazon
AMZN
+$66M
2
IWM icon
iShares Russell 2000 ETF
IWM
+$60.3M
3
GOOG icon
Alphabet (Google) Class C
GOOG
+$33.9M
4
AAPL icon
Apple
AAPL
+$21.1M
5
XLF icon
State Street Financial Select Sector SPDR ETF
XLF
+$18.2M

Sector Composition

Rank Sector Weight
1 Communication Services 0.58%
2 Technology 0.42%
3 Healthcare 0.34%
4 Consumer Discretionary 0.29%
5 Industrials 0.21%
Name Market Value Portfolio Weight Shares or Principal Change
in Stake 		Capital Flow
IHE icon
7426
iShares US Pharmaceuticals ETF
IHE
$1.47B
– –
-36
Closed -$1K
IHI icon
7427
iShares US Medical Devices ETF
IHI
$3.02B
– –
-162
Closed -$5K
IJH icon
7428
iShares Core S&P Mid-Cap ETF
IJH
$123B
– –
-2,130
Closed -$70K
IJR icon
7429
iShares Core S&P Small-Cap ETF
IJR
$109B
– –
-19,511
Closed -$1.35M
ILPT
7430
CALL
Industrial Logistics Properties Trust
ILPT
$613M
– –
-45
Closed -$88K
ILPT
7431
Industrial Logistics Properties Trust
ILPT
$613M
$0 ﹤0.01%
9,166
+3,343
+57% +$68.8K
ILPT
7432
PUT
Industrial Logistics Properties Trust
ILPT
$613M
– –
-10
Closed -$19K
IMKTA icon
7433
CALL
Ingles Markets
IMKTA
$1.63B
– –
-1
Closed -$2K
INGN icon
7434
Inogen
INGN
$167M
– –
-624
Closed -$77.8K
INGR icon
7435
Ingredion
INGR
$6.38B
– –
-2,343
Closed -$221K
INN
7436
CALL
Summit Hotel Properties
INN
$761M
– –
-3
Closed -$2K
INSM icon
7437
Insmed
INSM
$23.2B
– –
-800
Closed -$20.7K
IOVA icon
7438
Iovance Biotherapeutics
IOVA
$2.23B
– –
-2,164
Closed -$21K
IOVA icon
7439
PUT
Iovance Biotherapeutics
IOVA
$2.23B
– –
-10
Closed -$8K
IPG
7440
DELISTED
Interpublic Group of Companies
IPG
– –
-326
Closed -$7.26K
IQV icon
7441
IQVIA
IQV
$34.7B
– –
-1,082
Closed -$144K
IRT icon
7442
PUT
Independence Realty Trust
IRT
$3.92B
– –
-5
Closed -$4K
IT icon
7443
Gartner
IT
$9.41B
– –
-10,170
Closed -$1.41M
ITT icon
7444
ITT
ITT
$17.5B
– –
-3,623
Closed -$198K
ITRI icon
7445
Itron
ITRI
$3.73B
– –
-894
Closed -$47.4K
ITRI icon
7446
PUT
Itron
ITRI
$3.73B
– –
-6
Closed -$28K
IVE icon
7447
iShares S&P 500 Value ETF
IVE
$48.9B
$0 ﹤0.01%
+2
New +$220
IVV icon
7448
iShares Core S&P 500 ETF
IVV
$876B
– –
-114
Closed -$28K
IVZ icon
7449
Invesco
IVZ
$13.3B
– –
-30,473
Closed -$570K
IWB icon
7450
iShares Russell 1000 ETF
IWB
$47.7B
– –
-344
Closed -$47K
296 297
298
299 300

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Simplex Trading's Q1 2019 Portfolio in Review

As of Q1 2019, Simplex Trading held 8,479 positions worth $36B, up 5.5% from $34.1B the previous quarter. Its ten largest holdings account for 35% of the portfolio.

Simplex Trading's Q1 2019 filing shows 1,472 new, 3,049 increased, 2,419 reduced and 1,324 closed positions. Its largest new stake was Walt Disney: 228,471 shares worth $25.4M. The largest sale was Amazon, an estimated $66M.

By sector, the portfolio is most concentrated in Communication Services at 0.58% of assets, up from 0.49% a quarter earlier, followed by Technology and Healthcare.

  • Simplex Trading's largest Q1 2019 buy was Walt Disney: 228,471 shares worth $25.4M.
  • Simplex Trading added most to Invesco QQQ Trust in Q1 2019, an estimated $86.9M increase.
  • Simplex Trading's biggest Q1 2019 reduction was iShares Russell 2000 ETF, cutting an estimated $60.3M.
  • Simplex Trading fully exited Amazon in Q1 2019, selling an estimated $66M.
  • Simplex Trading's ten largest holdings make up 35% of its $36B portfolio in Q1 2019.
  • Simplex Trading opened 1,472 new positions and closed 1,324 in Q1 2019.
  • Simplex Trading's portfolio value rose 5.5% quarter-over-quarter to $36B.

Based on Simplex Trading's 13F filing for Q1 2019, filed 18 Apr 2019.