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Simplex Trading

Simplex Trading Portfolio holdings

AUM $171B
1-Year Est. Return 85%
 

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
-18.41%
1 Year Est. Return
+85%
3 Year Est. Return
+183.25%
5 Year Est. Return
+145.21%
10 Year Est. Return
+1,056.84%
AUM
$34.1B
AUM Growth
+$2.94B
Cap. Flow
-$227M
Cap. Flow %
-0.67%
Top 10 Hldgs %
42.6%
Holding
8,576
New
1,199
Increased
2,701
Reduced
2,877
Closed
1,572

Top Buys

Rank Stock Value
1
IWM icon
iShares Russell 2000 ETF
IWM
+$58.5M
2
GOOG icon
Alphabet (Google) Class C
GOOG
+$56.5M
3
SPY icon
State Street SPDR S&P 500 ETF Trust
SPY
+$44.1M
4
AAPL icon
Apple
AAPL
+$20.3M
5
XOP icon
State Street SPDR S&P Oil & Gas Exploration & Production ETF
XOP
+$12.7M

Top Sells

Rank Stock Value
1
AMZN icon
Amazon
AMZN
+$109M
2
META icon
Meta Platforms (Facebook)
META
+$62.3M
3
QQQ icon
Invesco QQQ Trust
QQQ
+$36.2M
4
GS icon
Goldman Sachs
GS
+$27.1M
5
BA icon
Boeing
BA
+$24.7M

Sector Composition

Rank Sector Weight
1 Miscellaneous 97.5%
2 Communication Services 0.5%
3 Consumer Discretionary 0.49%
4 Technology 0.41%
5 Financials 0.26%
Name Market Value Portfolio Weight Shares or Principal Change
in Stake 		Capital Flow
SNN icon
7751
Smith & Nephew
SNN
$12.1B
– –
-163
Closed -$5.87K
SNX icon
7752
TD Synnex
SNX
$21B
– –
-6,390
Closed -$253K
SO icon
7753
Southern Company
SO
$101B
– –
-2,283
Closed -$104K
SOCL icon
7754
Global X Social Media ETF
SOCL
$92.6M
– –
-3,834
Closed -$122K
SOS
7755
SOS Limited
SOS
$14.3M
– –
0
– –
SOYB icon
7756
Teucrium Soybean Fund
SOYB
$47M
– –
-2,112
Closed -$34.3K
SPB icon
7757
Spectrum Brands
SPB
$2.04B
– –
-1,969
Closed -$114K
SPNT icon
7758
PUT
SiriusPoint
SPNT
$2.84B
– –
-10
Closed -$13K
SPR
7759
DELISTED
Spirit AeroSystems
SPR
– –
-7,898
Closed -$641K
SPSM icon
7760
State Street SPDR Portfolio S&P 600 Small Cap ETF
SPSM
$16.6B
– –
-100
Closed -$3K
SPTS icon
7761
PUT
State Street SPDR Portfolio Short Term Treasury ETF
SPTS
$7.35B
– –
-3
Closed -$9K
SPWH icon
7762
Sportsman's Warehouse
SPWH
$50.9M
– –
-1,489
Closed -$7.24K
SPXL icon
7763
Direxion Daily S&P 500 Bull 3x ETF
SPXL
$7.17B
– –
-2,017
Closed -$109K
SPYG icon
7764
State Street SPDR Portfolio S&P 500 Growth ETF
SPYG
$54.6B
– –
-314
Closed -$12K
SQM icon
7765
Sociedad Química y Minera de Chile
SQM
$21.8B
– –
-8,676
Closed -$374K
SQQQ icon
7766
ProShares UltraPro Short QQQ
SQQQ
$2.09B
– –
-2
Closed -$43K
SRDX
7767
DELISTED
Surmodics
SRDX
– –
-1,991
Closed -$119K
SRDX
7768
PUT
DELISTED
Surmodics
SRDX
– –
-31
Closed -$231K
SRE icon
7769
Sempra
SRE
$55B
– –
-3,124
Closed -$178K
SRG
7770
Seritage Growth Properties
SRG
$117M
– –
-14,904
Closed -$577K
SRL icon
7771
Scully Royalty
SRL
$86.8M
$0 ﹤0.01%
+600
New +$2.98K
SSL icon
7772
Sasol
SSL
$7.87B
$0 ﹤0.01%
+2
New +$65
SSL icon
7773
PUT
Sasol
SSL
$7.87B
– –
-4
Closed -$15K
SSO icon
7774
ProShares Ultra S&P500
SSO
$9.11B
– –
-217,232
Closed -$2.96M
SSRM icon
7775
SSR Mining
SSRM
$7.58B
– –
-3,715
Closed -$39.4K
309 310
311
312 313

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Simplex Trading's Q4 2018 Portfolio in Review

As of Q4 2018, Simplex Trading held 8,576 positions worth $34.1B, up 9.5% from $31.1B the previous quarter. Its ten largest holdings account for 43% of the portfolio.

Simplex Trading's Q4 2018 filing shows 1,199 new, 2,701 increased, 2,877 reduced and 1,572 closed positions. Its largest new stake was State Street SPDR S&P 500 ETF Trust: 163,699 shares worth $40.9M. The largest sale was Amazon, an estimated $109M.

By sector, the portfolio is most concentrated in Miscellaneous at 97% of assets, up from 95% a quarter earlier, followed by Communication Services and Consumer Discretionary.

  • Simplex Trading's largest Q4 2018 buy was State Street SPDR S&P 500 ETF Trust: 163,699 shares worth $40.9M.
  • Simplex Trading added most to iShares Russell 2000 ETF in Q4 2018, an estimated $58.5M increase.
  • Simplex Trading's biggest Q4 2018 reduction was Amazon, cutting an estimated $109M.
  • Simplex Trading fully exited Meta Platforms (Facebook) in Q4 2018, selling an estimated $62.3M.
  • Simplex Trading's ten largest holdings make up 43% of its $34.1B portfolio in Q4 2018.
  • Simplex Trading opened 1,199 new positions and closed 1,572 in Q4 2018.
  • Simplex Trading's portfolio value rose 9.5% quarter-over-quarter to $34.1B.

Based on Simplex Trading's 13F filing for Q4 2018, filed 16 Jan 2019.