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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
+3.04%
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
$2.27B
AUM Growth
-$49.2M
Cap. Flow
-$210M
Cap. Flow %
-9.24%
Top 10 Hldgs %
17.82%
Holding
7,591
New
1,643
Increased
2,060
Reduced
2,267
Closed
1,502

Top Buys

Rank Stock Value
1
TSLA icon
Tesla
TSLA
+$33.5M
2
NFLX icon
Netflix
NFLX
+$22.8M
3
DIA icon
State Street SPDR Dow Jones Industrial Average ETF Trust
DIA
+$20.9M
4
TWX
Time Warner Inc
TWX
+$18.3M
5
BABA icon
Alibaba
BABA
+$15.2M

Top Sells

Rank Stock Value
1
AMZN icon
Amazon
AMZN
+$71.1M
2
MU icon
Micron Technology
MU
+$43.8M
3
GOOG icon
Alphabet (Google) Class C
GOOG
+$26.3M
4
BKNG icon
Booking.com
BKNG
+$22.2M
5
BA icon
Boeing
BA
+$21.6M

Sector Composition

Rank Sector Weight
1 Consumer Discretionary 7.87%
2 Communication Services 7.14%
3 Technology 6.23%
4 Financials 5.5%
5 Healthcare 5.2%
Name Market Value Portfolio Weight Shares or Principal Change
in Stake 		Capital Flow
ISRG icon
6476
Intuitive Surgical
ISRG
$121B
– –
-23,919
Closed -$3.34M
ITB icon
6477
iShares US Home Construction ETF
ITB
$2.41B
– –
-91,030
Closed -$3.98M
ITGR icon
6478
CALL
Integer Holdings
ITGR
$3.35B
– –
-60
Closed -$3K
ITGR icon
6479
PUT
Integer Holdings
ITGR
$3.35B
– –
-59
Closed -$3K
ITUB icon
6480
Itaú Unibanco
ITUB
$91.3B
– –
-35,416
Closed -$265K
IVZ icon
6481
Invesco
IVZ
$13.3B
– –
-9,705
Closed -$335K
IWB icon
6482
iShares Russell 1000 ETF
IWB
$47.7B
– –
-2,682
Closed -$398K
IWN icon
6483
iShares Russell 2000 Value ETF
IWN
$14.4B
– –
-17,268
Closed -$2.17M
JEF icon
6484
PUT
Jefferies Financial Group
JEF
$12.9B
– –
-42
Closed -$1K
JELD icon
6485
JELD-WEN Holding
JELD
$94.8M
– –
-391
Closed -$14.2K
JILL icon
6486
J. Jill
JILL
$252M
– –
-160
Closed -$5.13K
JILL icon
6487
PUT
J. Jill
JILL
$252M
– –
-1
Closed -$2K
JKHY icon
6488
Jack Henry & Associates
JKHY
$10.7B
– –
-713
Closed -$86.7K
K
6489
DELISTED
Kellanova
K
– –
-8,205
Closed -$518K
KALU icon
6490
Kaiser Aluminum
KALU
$2.67B
– –
-1,090
Closed -$117K
KB icon
6491
KB Financial Group
KB
$41.2B
– –
-1,166
Closed -$68K
KELYA icon
6492
Kelly Services Class A
KELYA
$526M
– –
-84
Closed -$2K
KELYB
6493
PUT
Kelly Services Class B
KELYB
$760M
– –
-7
Closed -$1K
KEX icon
6494
CALL
Kirby Corp
KEX
$7.95B
– –
-62
Closed -$16K
KEX icon
6495
PUT
Kirby Corp
KEX
$7.95B
– –
-7
Closed -$1K
KFRC icon
6496
Kforce
KFRC
$983M
$0 ﹤0.01%
+9
New +$242
KFY icon
6497
CALL
Korn Ferry
KFY
$3.98B
– –
-5
Closed -$1K
KFY icon
6498
PUT
Korn Ferry
KFY
$3.98B
– –
-26
Closed -$6K
KGC icon
6499
CALL
Kinross Gold
KGC
$28.5B
– –
-85
Closed -$1K
KHC icon
6500
Kraft Heinz
KHC
$30.4B
– –
-41,453
Closed -$2.97M
258 259
260
261 262

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Simplex Trading's Q1 2018 Portfolio in Review

As of Q1 2018, Simplex Trading held 7,591 positions worth $2.27B, down 2.1% from $2.32B the previous quarter. Its ten largest holdings account for 18% of the portfolio.

Simplex Trading withdrew a net $210M in Q1 2018, closing 1,502 positions and reducing 2,267 holdings. Its most notable exit was Alphabet (Google) Class C, an estimated $26.3M position sold in full.

By sector, the portfolio is most concentrated in Consumer Discretionary at 7.9% of assets, down from 11% a quarter earlier, followed by Communication Services and Technology.

Against the trend, Simplex Trading opened a new position in Tesla worth $27.1M.

  • Simplex Trading's largest Q1 2018 buy was Tesla: 1,525,035 shares worth $27.1M.
  • Simplex Trading added most to Netflix in Q1 2018, an estimated $22.8M increase.
  • Simplex Trading's biggest Q1 2018 reduction was Amazon, cutting an estimated $71.1M.
  • Simplex Trading fully exited Alphabet (Google) Class C in Q1 2018, selling an estimated $26.3M.
  • Simplex Trading's ten largest holdings make up 18% of its $2.27B portfolio in Q1 2018.
  • Simplex Trading opened 1,643 new positions and closed 1,502 in Q1 2018.
  • Simplex Trading's portfolio value fell 2.1% quarter-over-quarter to $2.27B.

Based on Simplex Trading's 13F filing for Q1 2018, filed 26 Apr 2018.