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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
+6.2%
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
$2.32B
AUM Growth
-$126M
Cap. Flow
-$315M
Cap. Flow %
-13.55%
Top 10 Hldgs %
17.34%
Holding
7,407
New
1,548
Increased
2,053
Reduced
2,239
Closed
1,460

Top Buys

Rank Stock Value
1
CELG
Celgene Corp
CELG
+$31.6M
2
C icon
Citigroup
C
+$19.5M
3
AGN
Allergan plc
AGN
+$18.4M
4
BIDU icon
Baidu
BIDU
+$18M
5
EEM icon
iShares MSCI Emerging Markets ETF
EEM
+$14.2M

Top Sells

Rank Stock Value
1
AMZN icon
Amazon
AMZN
+$81.3M
2
NVDA icon
NVIDIA
NVDA
+$60.2M
3
GOOG icon
Alphabet (Google) Class C
GOOG
+$48.2M
4
AAPL icon
Apple
AAPL
+$48.2M
5
META icon
Meta Platforms (Facebook)
META
+$31.2M

Sector Composition

Rank Sector Weight
1 Consumer Discretionary 11.27%
2 Technology 10.64%
3 Healthcare 7.06%
4 Communication Services 6.92%
5 Industrials 5.66%
Name Market Value Portfolio Weight Shares or Principal Change
in Stake 		Capital Flow
WCN
6776
CALL
Waste Connections
WCN
$42.7B
– –
-267
Closed -$63K
WCN
6777
PUT
Waste Connections
WCN
$42.7B
– –
-5
Closed -$2K
WDC icon
6778
Western Digital
WDC
$192B
– –
-150,315
Closed -$9.68M
WERN icon
6779
CALL
Werner Enterprises
WERN
$2.63B
– –
-24
Closed -$8K
WERN icon
6780
Werner Enterprises
WERN
$2.63B
– –
-3,444
Closed -$125K
WFC icon
6781
Wells Fargo
WFC
$261B
– –
-131,568
Closed -$7.43M
WKC icon
6782
CALL
World Kinect Corp
WKC
$1.86B
– –
-123
Closed -$7K
WKC icon
6783
PUT
World Kinect Corp
WKC
$1.86B
– –
-12
Closed -$2K
WNS
6784
DELISTED
WNS Holdings
WNS
– –
-100
Closed -$3K
WOLF icon
6785
Wolfspeed
WOLF
$1.35B
– –
-6,597
Closed -$227K
WOR icon
6786
Worthington Enterprises
WOR
$2.72B
– –
-324
Closed -$8.65K
WOR icon
6787
PUT
Worthington Enterprises
WOR
$2.72B
– –
-39
Closed -$3K
WPM icon
6788
Wheaton Precious Metals
WPM
$50B
– –
-4,336
Closed -$90.4K
WPP icon
6789
CALL
WPP
WPP
$3.91B
– –
-22
Closed -$4K
WPP icon
6790
WPP
WPP
$3.91B
– –
-339
Closed -$30K
WRB icon
6791
PUT
W.R. Berkley
WRB
$27.2B
– –
-419
Closed -$12K
WSO icon
6792
Watsco Inc
WSO
$14.8B
– –
-8,669
Closed -$1.43M
WSR
6793
CALL
DELISTED
Whitestone REIT
WSR
– –
-204
Closed -$15K
WSR
6794
PUT
DELISTED
Whitestone REIT
WSR
– –
-240
Closed -$11K
WTFC icon
6795
Wintrust Financial
WTFC
$10.6B
$0 ﹤0.01%
11
-4,629
-100% -$373K
WTFC icon
6796
PUT
Wintrust Financial
WTFC
$10.6B
– –
-101
Closed -$17K
WTI icon
6797
CALL
W&T Offshore
WTI
$573M
– –
-62
Closed -$1K
WTS icon
6798
Watts Water Technologies
WTS
$11.5B
– –
-155
Closed -$11.1K
WU icon
6799
Western Union
WU
$2.6B
– –
-3,548
Closed -$69.6K
WTW icon
6800
Willis Towers Watson
WTW
$27.2B
– –
-1,333
Closed -$211K
270 271
272
273 274

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Simplex Trading's Q4 2017 Portfolio in Review

As of Q4 2017, Simplex Trading held 7,407 positions worth $2.32B, down 5.1% from $2.45B the previous quarter. Its ten largest holdings account for 17% of the portfolio.

Simplex Trading withdrew a net $315M in Q4 2017, closing 1,460 positions and reducing 2,239 holdings. Its most notable exit was iShares 20+ Year Treasury Bond ETF, an estimated $21.1M position sold in full.

By sector, the portfolio is most concentrated in Consumer Discretionary at 11% of assets, down from 14% a quarter earlier, followed by Technology and Healthcare.

Against the trend, Simplex Trading opened a new position in Celgene Corp worth $29.2M.

  • Simplex Trading's largest Q4 2017 buy was Celgene Corp: 280,194 shares worth $29.2M.
  • Simplex Trading added most to Baidu in Q4 2017, an estimated $18M increase.
  • Simplex Trading's biggest Q4 2017 reduction was Amazon, cutting an estimated $81.3M.
  • Simplex Trading fully exited iShares 20+ Year Treasury Bond ETF in Q4 2017, selling an estimated $21.1M.
  • Simplex Trading's ten largest holdings make up 17% of its $2.32B portfolio in Q4 2017.
  • Simplex Trading opened 1,548 new positions and closed 1,460 in Q4 2017.
  • Simplex Trading's portfolio value fell 5.1% quarter-over-quarter to $2.32B.

Based on Simplex Trading's 13F filing for Q4 2017, filed 10 Jan 2018.