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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
-18.41%
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
$34.1B
AUM Growth
+$2.94B
Cap. Flow
-$379M
Cap. Flow %
-1.11%
Top 10 Hldgs %
42.6%
Holding
8,576
New
1,199
Increased
2,701
Reduced
2,877
Closed
1,573

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 Communication Services 0.49%
2 Consumer Discretionary 0.48%
3 Technology 0.4%
4 Financials 0.25%
5 Industrials 0.22%
Name Market Value Portfolio Weight Shares or Principal Change
in Stake 		Capital Flow
WNC icon
7926
Wabash National
WNC
$541M
– –
-1,863
Closed -$27.5K
WSR
7927
DELISTED
Whitestone REIT
WSR
– –
-567
Closed -$7.69K
WTFC icon
7928
Wintrust Financial
WTFC
$10.6B
– –
-3,563
Closed -$271K
WTI icon
7929
W&T Offshore
WTI
$577M
– –
-14,479
Closed -$92.5K
WU icon
7930
Western Union
WU
$2.6B
– –
-15,148
Closed -$275K
WTW icon
7931
Willis Towers Watson
WTW
$27.1B
– –
-9,366
Closed -$1.4M
WWD icon
7932
PUT
Woodward
WWD
$24.6B
– –
-1
Closed -$8K
WY icon
7933
Weyerhaeuser
WY
$17B
– –
-13,443
Closed -$358K
X
7934
DELISTED
US Steel
X
– –
-123,454
Closed -$3.09M
XBIT icon
7935
XBiotech
XBIT
$69.2M
– –
-4,082
Closed -$16.7K
XEL icon
7936
Xcel Energy
XEL
$50.5B
– –
-2,372
Closed -$119K
XEL icon
7937
PUT
Xcel Energy
XEL
$50.5B
– –
-7
Closed -$33K
XENE icon
7938
CALL
Xenon Pharmaceuticals
XENE
$6.32B
– –
-5
Closed -$6K
XHR
7939
Xenia Hotels & Resorts
XHR
$1.94B
– –
-113
Closed -$2K
XHR
7940
PUT
Xenia Hotels & Resorts
XHR
$1.94B
– –
-3
Closed -$7K
XMLV icon
7941
Invesco S&P MidCap Low Volatility ETF
XMLV
$748M
$0 ﹤0.01%
+16
New +$749
XNCR icon
7942
PUT
Xencor
XNCR
$1.45B
– –
-10
Closed -$38K
XPRO icon
7943
Expro Ltd
XPRO
$1.77B
– –
-6
Closed –
YANG icon
7944
Direxion Daily FTSE China Bear 3X ETF
YANG
$87.8M
– –
-97
Closed -$110K
YUMC icon
7945
Yum China
YUMC
$14.8B
– –
-25,413
Closed -$872K
ZBRA icon
7946
Zebra Technologies
ZBRA
$12.2B
– –
-16,857
Closed -$2.81M
ZD icon
7947
CALL
Ziff Davis
ZD
$1.91B
– –
-1
Closed -$8K
ZEUS
7948
CALL
DELISTED
Olympic Steel
ZEUS
– –
-3
Closed -$6K
ZTO icon
7949
ZTO Express
ZTO
$18.3B
– –
-20
Closed -$322
ZWS icon
7950
PUT
Zurn Elkay Water Solutions
ZWS
$8B
– –
-4
Closed -$6K
316 317
318
319 320

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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 1,573 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 Communication Services at 0.49% of assets, down from 0.89% a quarter earlier, followed by Consumer Discretionary and Technology.

  • 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 1,573 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.