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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
AOS icon
7076
A.O. Smith
AOS
$8.38B
– –
-11,621
Closed -$578K
APAM icon
7077
CALL
Artisan Partners
APAM
$2.79B
– –
-1
Closed -$2K
APAM icon
7078
PUT
Artisan Partners
APAM
$2.79B
– –
-1
Closed -$2K
APEI icon
7079
CALL
American Public Education
APEI
$875M
– –
-1
Closed -$2K
APEI icon
7080
American Public Education
APEI
$875M
– –
-220
Closed -$6.78K
APLE icon
7081
Apple Hospitality REIT
APLE
$3.96B
– –
-9,781
Closed -$157K
ARAY icon
7082
Accuray
ARAY
$28.4M
– –
-10,554
Closed -$48K
ARCB icon
7083
CALL
ArcBest
ARCB
$3.44B
– –
-3
Closed -$10K
ARCO icon
7084
Arcos Dorados Holdings
ARCO
$1.73B
$0 ﹤0.01%
102
-6,559
-98% -$53.3K
ARDX icon
7085
Ardelyx
ARDX
$1.24B
– –
-2,022
Closed -$3K
ARDX icon
7086
PUT
Ardelyx
ARDX
$1.24B
– –
-21
Closed -$3K
ARGX icon
7087
CALL
argenx
ARGX
$57.4B
– –
-5
Closed -$48K
ARLP icon
7088
Alliance Resource Partners
ARLP
$3.18B
– –
-1,318
Closed -$25.5K
ARMK icon
7089
Aramark
ARMK
$15B
– –
-61,504
Closed -$1.38M
ASA
7090
ASA Gold and Precious Metals
ASA
$948M
– –
-815
Closed -$8.17K
ASC icon
7091
Ardmore Shipping
ASC
$678M
– –
-2,706
Closed -$14.9K
ASH icon
7092
Ashland
ASH
$3.04B
– –
-2,231
Closed -$172K
ASND icon
7093
Ascendis Pharma A/S
ASND
$16.7B
– –
-14,993
Closed -$1.31M
ASR icon
7094
CALL
Grupo Aeroportuario del Sureste
ASR
$8.03B
– –
-1
Closed -$15K
ASTE icon
7095
Astec Industries
ASTE
$1.3B
– –
-356
Closed -$13.3K
ASYS icon
7096
CALL
Amtech Systems
ASYS
$278M
– –
-11
Closed -$4K
ASYS icon
7097
Amtech Systems
ASYS
$278M
$0 ﹤0.01%
73
-177
-71% -$874
ATKR icon
7098
Atkore
ATKR
$2.59B
– –
-1,627
Closed -$36.4K
ATNI icon
7099
ATN International
ATNI
$361M
– –
-104
Closed -$6.89K
ATNM icon
7100
Actinium Pharmaceuticals
ATNM
$27M
– –
-90
Closed -$1.44K
282 283
284
285 286

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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.