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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
SSL icon
7801
CALL
Sasol
SSL
$7.72B
– –
-1
Closed -$2K
SSL icon
7802
Sasol
SSL
$7.72B
$0 ﹤0.01%
1
-1
-50% -$30
SSNC icon
7803
SS&C Technologies
SSNC
$16.1B
– –
-1,925
Closed -$107K
SSYS icon
7804
Stratasys
SSYS
$695M
– –
-13,577
Closed -$327K
STC icon
7805
Stewart Information Services
STC
$1.95B
– –
-268
Closed -$11.5K
STGW icon
7806
Stagwell
STGW
$1.76B
– –
-64,818
Closed -$178K
STKL
7807
DELISTED
SunOpta
STKL
– –
-11,676
Closed -$45.2K
STLD icon
7808
Steel Dynamics
STLD
$34.7B
– –
-1,188
Closed -$42.2K
STRL icon
7809
PUT
Sterling Infrastructure
STRL
$22B
– –
-18
Closed -$19K
STWD icon
7810
Starwood Property Trust
STWD
$6.05B
– –
-3,879
Closed -$84.6K
SUPN icon
7811
Supernus Pharmaceuticals
SUPN
$2.74B
– –
-24,583
Closed -$915K
SVC
7812
Service Properties Trust
SVC
$1.1B
– –
-196
Closed -$25.9K
SWKS icon
7813
Skyworks Solutions
SWKS
$9.1B
– –
-2,131
Closed -$165K
SXT icon
7814
Sensient Technologies
SXT
$4.98B
– –
-3
Closed –
SYF icon
7815
Synchrony
SYF
$23.3B
– –
-19,219
Closed -$578K
TACT icon
7816
PUT
Transact Technologies
TACT
$51.1M
– –
-38
Closed -$34K
TAK icon
7817
CALL
Takeda Pharmaceutical
TAK
$53.7B
– –
-13
Closed -$21K
TALO icon
7818
PUT
Talos Energy
TALO
$2.55B
– –
-2
Closed -$3K
TBBK icon
7819
The Bancorp
TBBK
$2.74B
– –
-1,896
Closed -$15K
TBF icon
7820
ProShares Short 20+ Year Treasury ETF
TBF
$85.1M
– –
-8,366
Closed -$187K
TBI
7821
CALL
Trueblue
TBI
$232M
– –
-5
Closed -$11K
TBPH icon
7822
CALL
Theravance Biopharma
TBPH
$874M
– –
-1
Closed -$2K
TBPH icon
7823
Theravance Biopharma
TBPH
$874M
$0 ﹤0.01%
6
-151
-96% -$3.83K
TCBI icon
7824
Texas Capital Bancshares
TCBI
$4.31B
– –
-28,777
Closed -$1.67M
TCX icon
7825
Tucows
TCX
$101M
– –
-2,602
Closed -$189K
311 312
313
314 315

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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.