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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
COLL icon
7201
CALL
Collegium Pharmaceutical
COLL
$1.14B
– –
-20
Closed -$34K
COLM icon
7202
Columbia Sportswear
COLM
$3.19B
– –
-1,600
Closed -$154K
COOP
7203
CALL
DELISTED
Mr. Cooper
COOP
– –
-36
Closed -$42K
CORN icon
7204
Teucrium Corn Fund
CORN
$190M
– –
-2,995
Closed -$47K
COTY icon
7205
Coty
COTY
$2.33B
– –
-42,976
Closed -$406K
COST icon
7206
Costco
COST
$415B
– –
-200
Closed -$43.7K
CP icon
7207
Canadian Pacific Kansas City
CP
$82B
– –
-15,615
Closed -$626K
CRBP icon
7208
Corbus Pharmaceuticals
CRBP
$170M
– –
-632
Closed -$139K
CRH icon
7209
CALL
CRH
CRH
$66.7B
– –
-106
Closed -$279K
CRIS icon
7210
Curis
CRIS
$9.53M
– –
-9
Closed -$4.31K
CRI icon
7211
CALL
Carter's
CRI
$1.43B
– –
-27
Closed -$220K
CRTO icon
7212
Criteo
CRTO
$1.03B
– –
-1,588
Closed -$36K
CRTO icon
7213
PUT
Criteo
CRTO
$1.03B
– –
-100
Closed -$227K
CSGP icon
7214
CALL
CoStar Group
CSGP
$11.3B
– –
-10
Closed -$33K
CSGS
7215
PUT
DELISTED
CSG Systems International
CSGS
– –
-100
Closed -$317K
CSL icon
7216
Carlisle Companies
CSL
$13.6B
– –
-215
Closed -$24.8K
CSL icon
7217
PUT
Carlisle Companies
CSL
$13.6B
– –
-2
Closed -$20K
CSV icon
7218
Carriage Services
CSV
$618M
$0 ﹤0.01%
+1
New +$19
CSX icon
7219
CSX Corp
CSX
$98.6B
– –
-600
Closed -$13.9K
CTLP
7220
DELISTED
Cantaloupe
CTLP
– –
-22,337
Closed -$100K
CTS icon
7221
CTS Corp
CTS
$1.72B
– –
-107
Closed -$2K
CTSH icon
7222
Cognizant
CTSH
$21.5B
– –
-10,945
Closed -$766K
CURE icon
7223
Direxion Daily Healthcare Bull 3X ETF
CURE
$178M
– –
-974
Closed -$46K
CVEO icon
7224
Civeo
CVEO
$379M
$0 ﹤0.01%
+40
New +$1.09K
CVX icon
7225
Chevron
CVX
$388B
– –
-10,804
Closed -$1.28M
287 288
289
290 291

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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.