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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
AGRO icon
7051
Adecoagro
AGRO
$1.53B
– –
-16
Closed -$114
AHT
7052
CALL
Ashford Hospitality Trust
AHT
$21M
– –
0
– -$1K
AIG icon
7053
American International
AIG
$41.9B
– –
-75,175
Closed -$3.21M
AIV
7054
Aimco
AIV
$380M
– –
-77,065
Closed -$497K
AIV
7055
PUT
Aimco
AIV
$380M
– –
-3,333
Closed -$1.95M
AKR icon
7056
Acadia Realty Trust
AKR
$2.99B
$0 ﹤0.01%
34
-661
-95% -$18.2K
AKR icon
7057
PUT
Acadia Realty Trust
AKR
$2.99B
– –
-7
Closed -$16K
ALDX icon
7058
Aldeyra Therapeutics
ALDX
$91.7M
– –
-157
Closed -$1.33K
ALGN icon
7059
Align Technology
ALGN
$12B
– –
-7,496
Closed -$1.79M
ALGT icon
7060
Allegiant Air
ALGT
$2.64B
– –
-406
Closed -$51.6K
ALK icon
7061
Alaska Air
ALK
$5.15B
– –
-19,836
Closed -$1.21M
ALLE icon
7062
PUT
Allegion
ALLE
$13B
– –
-88
Closed -$701K
ALLY icon
7063
Ally Financial
ALLY
$13.1B
– –
-62,333
Closed -$1.63M
ALTO icon
7064
CALL
Alto Ingredients
ALTO
$360M
– –
-19
Closed -$1K
AMAT icon
7065
Applied Materials
AMAT
$426B
– –
-4,608
Closed -$175K
AMG icon
7066
Affiliated Managers Group
AMG
$9.46B
– –
-14,767
Closed -$1.57M
AMKR icon
7067
Amkor Technology
AMKR
$16.1B
– –
-5,600
Closed -$46.3K
AMKR icon
7068
PUT
Amkor Technology
AMKR
$16.1B
– –
-45
Closed -$29K
AMPH icon
7069
Amphastar Pharmaceuticals
AMPH
$825M
– –
-519
Closed -$10K
AMPY icon
7070
Amplify Energy
AMPY
$163M
– –
-71
Closed –
AMPY icon
7071
PUT
Amplify Energy
AMPY
$163M
– –
-2
Closed -$1K
AMX icon
7072
America Movil
AMX
$78.1B
– –
-1,950
Closed -$29.4K
AMZN icon
7073
Amazon
AMZN
$2.5T
– –
-793,180
Closed -$66M
ANF icon
7074
Abercrombie & Fitch
ANF
$4.17B
– –
-11,642
Closed -$261K
AON icon
7075
Aon
AON
$77.3B
– –
-12,007
Closed -$1.95M
281 282
283
284 285

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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.