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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
LOCO icon
7501
PUT
El Pollo Loco
LOCO
$483M
– –
-1
Closed -$1K
LODE icon
7502
PUT
Comstock
LODE
$225M
– –
-4
Closed -$18K
LOGI icon
7503
Logitech
LOGI
$15.2B
– –
-1,885
Closed -$67.9K
LOMA
7504
PUT
Loma Negra
LOMA
$1.32B
– –
-48
Closed -$53K
LOW icon
7505
Lowe's Companies
LOW
$116B
– –
-12,490
Closed -$1.25M
LPCN icon
7506
Lipocine
LPCN
$17.8M
$0 ﹤0.01%
+25
New +$767
LPL icon
7507
LG Display
LPL
$3.19B
– –
-10,696
Closed -$95.2K
LPL icon
7508
PUT
LG Display
LPL
$3.19B
– –
-12
Closed -$9K
LPG icon
7509
CALL
Dorian LPG
LPG
$1.94B
– –
-113
Closed -$65K
LQDT icon
7510
Liquidity Services
LQDT
$1.18B
$0 ﹤0.01%
+106
New +$794
LRMR icon
7511
CALL
Larimar Therapeutics
LRMR
$424M
– –
-1
Closed -$5K
LSTA icon
7512
PUT
Lisata Therapeutics
LSTA
$16.2M
– –
-2
Closed -$12K
LULU icon
7513
lululemon athletica
LULU
$13B
– –
-25,011
Closed -$3.65M
LUV icon
7514
Southwest Airlines
LUV
$22.1B
– –
-13,146
Closed -$694K
LXP icon
7515
PUT
LXP Industrial Trust
LXP
$3.52B
– –
-1
Closed -$5K
LXRX icon
7516
Lexicon Pharmaceuticals
LXRX
$1.02B
– –
-58,586
Closed -$356K
LXU icon
7517
LSB Industries
LXU
$881M
– –
-714
Closed -$3.79K
LXU icon
7518
PUT
LSB Industries
LXU
$881M
– –
-10
Closed -$4K
LYB icon
7519
LyondellBasell Industries
LYB
$19.6B
– –
-664
Closed -$57.4K
LYG icon
7520
Lloyds Banking Group
LYG
$87.5B
– –
-52,300
Closed -$160K
LYG icon
7521
PUT
Lloyds Banking Group
LYG
$87.5B
– –
-523
Closed -$133K
LYTS icon
7522
LSI Industries
LYTS
$858M
– –
-145
Closed –
LZB icon
7523
La-Z-Boy
LZB
$1.59B
– –
-10,099
Closed -$319K
MA icon
7524
Mastercard
MA
$475B
– –
-26,346
Closed -$5.67M
MAA icon
7525
Mid-America Apartment Communities
MAA
$15.5B
– –
-1,992
Closed -$205K
299 300
301
302 303

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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.