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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
+5.31%
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
$25.5B
AUM Growth
+$23.2B
Cap. Flow
+$226M
Cap. Flow %
0.89%
Top 10 Hldgs %
29.06%
Holding
8,400
New
2,282
Increased
2,314
Reduced
2,591
Closed
1,035

Top Buys

Rank Stock Value
1
AAPL icon
Apple
AAPL
+$34.5M
2
MU icon
Micron Technology
MU
+$33.9M
3
BRK.B icon
Berkshire Hathaway Class B
BRK.B
+$30.8M
4
NVDA icon
NVIDIA
NVDA
+$23.5M
5
DIA icon
State Street SPDR Dow Jones Industrial Average ETF Trust
DIA
+$22.2M

Top Sells

Rank Stock Value
1
TWX
Time Warner Inc
TWX
+$34.8M
2
AMZN icon
Amazon
AMZN
+$31.2M
3
TSLA icon
Tesla
TSLA
+$17.6M
4
NFLX icon
Netflix
NFLX
+$15.5M
5
AMD icon
Advanced Micro Devices
AMD
+$12.9M

Sector Composition

Rank Sector Weight
1 Technology 1.23%
2 Consumer Discretionary 0.92%
3 Communication Services 0.73%
4 Financials 0.62%
5 Industrials 0.6%
Name Market Value Portfolio Weight Shares or Principal Change
in Stake 		Capital Flow
INVH icon
7601
Invitation Homes
INVH
$17.5B
– –
-21,657
Closed -$490K
INVH icon
7602
PUT
Invitation Homes
INVH
$17.5B
– –
-660
Closed -$20K
IP icon
7603
International Paper
IP
$20.1B
– –
-3,488
Closed -$178K
IPI icon
7604
Intrepid Potash
IPI
$463M
– –
-1,137
Closed -$49.7K
IPI icon
7605
PUT
Intrepid Potash
IPI
$463M
– –
-4
Closed -$1K
IR icon
7606
Ingersoll Rand
IR
$33B
– –
-301
Closed -$9.48K
IRT icon
7607
Independence Realty Trust
IRT
$3.87B
– –
-295
Closed -$2.84K
IRTC icon
7608
iRhythm Holdings
IRTC
$3.54B
– –
-357
Closed -$25K
IRWD icon
7609
Ironwood Pharmaceuticals
IRWD
$624M
– –
-48,273
Closed -$714K
IT icon
7610
Gartner
IT
$8.95B
– –
-571
Closed -$73.1K
ITGR icon
7611
Integer Holdings
ITGR
$3.31B
– –
-133
Closed -$8.25K
ITOT icon
7612
iShares Core S&P Total US Stock Market ETF
ITOT
$93.1B
$0 ﹤0.01%
+11
New +$683
IVE icon
7613
iShares S&P 500 Value ETF
IVE
$48.5B
– –
-2,071
Closed -$226K
IVR icon
7614
Invesco Mortgage Capital
IVR
$782M
– –
-210
Closed -$34.1K
IWM icon
7615
iShares Russell 2000 ETF
IWM
$81.2B
– –
-10,730
Closed -$1.63M
IWP icon
7616
iShares Russell Mid-Cap Growth ETF
IWP
$20.2B
– –
-8,182
Closed -$502K
J icon
7617
Jacobs Solutions
J
$15.6B
– –
-20,052
Closed -$1.03M
JAKK icon
7618
Jakks Pacific
JAKK
$272M
– –
-92
Closed -$2.45K
JAZZ icon
7619
Jazz Pharmaceuticals
JAZZ
$16B
– –
-1,544
Closed -$252K
JBSS icon
7620
John B. Sanfilippo & Son
JBSS
$939M
– –
-45
Closed -$2.92K
JCI icon
7621
Johnson Controls International
JCI
$87.4B
– –
-5,824
Closed -$202K
JNK icon
7622
State Street SPDR Bloomberg High Yield Bond ETF
JNK
$7.24B
– –
-12,172
Closed -$1.31M
KALA icon
7623
KALA BIO
KALA
$11.3M
– –
0
– –
KBE icon
7624
State Street SPDR S&P Bank ETF
KBE
$1.63B
– –
-7,254
Closed -$347K
KEP icon
7625
Korea Electric Power
KEP
$15.5B
– –
-100
Closed -$1.61K
303 304
305
306 307

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Simplex Trading's Q2 2018 Portfolio in Review

As of Q2 2018, Simplex Trading held 8,400 positions worth $25.5B, up 1,022% from $2.27B the previous quarter. Its ten largest holdings account for 29% of the portfolio.

Simplex Trading's Q2 2018 filing shows 2,282 new, 2,314 increased, 2,591 reduced and 1,035 closed positions. Its largest new stake was Alphabet (Google) Class C: 291,860 shares worth $16.3M. The largest sale was Time Warner Inc, an estimated $34.8M.

By sector, the portfolio is most concentrated in Technology at 1.2% of assets, down from 6.2% a quarter earlier, followed by Consumer Discretionary and Communication Services.

  • Simplex Trading's largest Q2 2018 buy was Alphabet (Google) Class C: 291,860 shares worth $16.3M.
  • Simplex Trading added most to Apple in Q2 2018, an estimated $34.5M increase.
  • Simplex Trading's biggest Q2 2018 reduction was Amazon, cutting an estimated $31.2M.
  • Simplex Trading fully exited Time Warner Inc in Q2 2018, selling an estimated $34.8M.
  • Simplex Trading's ten largest holdings make up 29% of its $25.5B portfolio in Q2 2018.
  • Simplex Trading opened 2,282 new positions and closed 1,035 in Q2 2018.
  • Simplex Trading's portfolio value rose 1,022% quarter-over-quarter to $25.5B.

Based on Simplex Trading's 13F filing for Q2 2018, filed 30 Jul 2018.