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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
BXMT icon
7151
PUT
Blackstone Mortgage Trust
BXMT
$2.82B
– –
-43
Closed -$136K
BXP icon
7152
Boston Properties
BXP
$11B
– –
-6,265
Closed -$805K
BZH icon
7153
Beazer Homes USA
BZH
$907M
– –
-11,924
Closed -$143K
BZUN
7154
Baozun
BZUN
$143M
– –
-26,568
Closed -$930K
CAAS icon
7155
China Automotive Systems
CAAS
$131M
– –
-18,623
Closed -$59.5K
CACI icon
7156
CALL
CACI
CACI
$10.8B
– –
-1
Closed -$14K
CAF
7157
PUT
Morgan Stanley China A Share Fund
CAF
$334M
– –
-2
Closed -$3K
CAMT icon
7158
Camtek
CAMT
$6.9B
– –
-854
Closed -$6.91K
CAMT icon
7159
PUT
Camtek
CAMT
$6.9B
– –
-10
Closed -$6K
CARM
7160
DELISTED
Carisma Therapeutics
CARM
$0 ﹤0.01%
+1
New +$17
CASY icon
7161
Casey's General Stores
CASY
$31.9B
– –
-1,773
Closed -$232K
CATY icon
7162
CALL
Cathay General Bancorp
CATY
$4.2B
– –
-2
Closed -$6K
CBT icon
7163
Cabot Corp
CBT
$4.65B
– –
-509
Closed -$22.9K
CC icon
7164
Chemours
CC
$2.59B
– –
-4,987
Closed -$181K
CDNA icon
7165
CareDx
CDNA
$1.92B
– –
-1,746
Closed -$50.9K
CDW icon
7166
CDW
CDW
$17.1B
– –
-457
Closed -$40.8K
CDZI icon
7167
Cadiz
CDZI
$266M
– –
-4,075
Closed -$41K
CDZI icon
7168
PUT
Cadiz
CDZI
$266M
– –
-1
Closed -$1K
CELH icon
7169
Celsius Holdings
CELH
$6.93B
$0 ﹤0.01%
+330
New +$423
CENTA icon
7170
CALL
Central Garden & Pet Co Class A
CENTA
$2.41B
– –
-6
Closed -$15K
CEVA icon
7171
CALL
CEVA Inc
CEVA
$1.01B
– –
-21
Closed -$46K
CEVA icon
7172
CEVA Inc
CEVA
$1.01B
– –
-528
Closed -$11K
CEVA icon
7173
PUT
CEVA Inc
CEVA
$1.01B
– –
-12
Closed -$26K
CFR icon
7174
Cullen/Frost Bankers
CFR
$10.3B
– –
-409
Closed -$40.6K
CGBD icon
7175
Carlyle Secured Lending
CGBD
$698M
– –
-230
Closed -$3.38K
285 286
287
288 289

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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.