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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
+6.87%
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
$2.45B
AUM Growth
+$147M
Cap. Flow
+$26.3M
Cap. Flow %
1.07%
Top 10 Hldgs %
23.61%
Holding
7,357
New
1,313
Increased
2,078
Reduced
2,339
Closed
1,500

Top Buys

Rank Stock Value
1
AMZN icon
Amazon
AMZN
+$45.9M
2
IWM icon
iShares Russell 2000 ETF
IWM
+$30.1M
3
TWX
Time Warner Inc
TWX
+$25.8M
4
BKNG icon
Booking.com
BKNG
+$22.5M
5
GOOG icon
Alphabet (Google) Class C
GOOG
+$17.7M

Top Sells

Rank Stock Value
1
SPY icon
State Street SPDR S&P 500 ETF Trust
SPY
+$43.6M
2
AMGN icon
Amgen
AMGN
+$33.2M
3
BIDU icon
Baidu
BIDU
+$19.3M
4
GOOGL icon
Alphabet (Google) Class A
GOOGL
+$17.3M
5
MU icon
Micron Technology
MU
+$17.1M

Sector Composition

Rank Sector Weight
1 Consumer Discretionary 14.31%
2 Technology 13.17%
3 Communication Services 11.81%
4 Healthcare 4.06%
5 Financials 3.84%
Name Market Value Portfolio Weight Shares or Principal Change
in Stake 		Capital Flow
CALX icon
5926
PUT
Calix
CALX
$2.27B
– –
-185
Closed -$7K
CAMT icon
5927
CALL
Camtek
CAMT
$6.9B
– –
-86
Closed -$4K
CAR icon
5928
Avis
CAR
$5.63B
– –
-100
Closed -$3.36K
CCI icon
5929
Crown Castle
CCI
$32.7B
– –
-3,470
Closed -$355K
CCJ icon
5930
Cameco
CCJ
$38.3B
– –
-14,534
Closed -$144K
CCOI icon
5931
PUT
Cogent Communications
CCOI
$594M
– –
-33
Closed -$16K
CCRN
5932
CALL
DELISTED
Cross Country Healthcare
CCRN
– –
-16
Closed -$1K
CDE icon
5933
PUT
Coeur Mining
CDE
$15.6B
– –
-74
Closed -$7K
CDNS icon
5934
Cadence Design Systems
CDNS
$90B
– –
-24,416
Closed -$900K
CDW icon
5935
CDW
CDW
$17.1B
– –
-745
Closed -$46.6K
CE icon
5936
Celanese
CE
$5.09B
– –
-1,090
Closed -$107K
CE icon
5937
PUT
Celanese
CE
$5.09B
– –
-142
Closed -$5K
CENT icon
5938
Central Garden & Pet Co
CENT
$2.74B
– –
-1,085
Closed -$27K
CENTA icon
5939
PUT
Central Garden & Pet Co Class A
CENTA
$2.41B
– –
-15
Closed -$1K
CENX icon
5940
Century Aluminum
CENX
$4.57B
– –
-16,600
Closed -$287K
CERS icon
5941
Cerus
CERS
$587M
– –
-14,358
Closed -$35.2K
CEVA icon
5942
PUT
CEVA Inc
CEVA
$1.01B
– –
-45
Closed -$5K
CF icon
5943
CF Industries
CF
$19.2B
– –
-17,343
Closed -$535K
CHCO icon
5944
City Holding Co
CHCO
$1.97B
– –
-880
Closed -$57.1K
CHDN icon
5945
CALL
Churchill Downs
CHDN
$6.03B
– –
-12
Closed -$1K
CHDN icon
5946
Churchill Downs
CHDN
$6.03B
– –
-23,448
Closed -$716K
CHE icon
5947
Chemed
CHE
$6.78B
– –
-129
Closed -$25.4K
CHEF icon
5948
PUT
Chefs' Warehouse
CHEF
$3.87B
– –
-55
Closed -$7K
CHGG icon
5949
PUT
Chegg
CHGG
$108M
– –
-17
Closed -$1K
CIA icon
5950
PUT
Citizens
CIA
$245M
– –
-81
Closed -$2K
236 237
238
239 240

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Simplex Trading's Q3 2017 Portfolio in Review

As of Q3 2017, Simplex Trading held 7,357 positions worth $2.45B, up 6.4% from $2.3B the previous quarter. Its ten largest holdings account for 24% of the portfolio.

Simplex Trading's Q3 2017 filing shows 1,313 new, 2,078 increased, 2,339 reduced and 1,500 closed positions. Its largest new stake was iShares Russell 2000 ETF: 214,170 shares worth $31.7M. The largest sale was State Street SPDR S&P 500 ETF Trust, an estimated $43.6M.

By sector, the portfolio is most concentrated in Consumer Discretionary at 14% of assets, up from 9.7% a quarter earlier, followed by Technology and Communication Services.

  • Simplex Trading's largest Q3 2017 buy was iShares Russell 2000 ETF: 214,170 shares worth $31.7M.
  • Simplex Trading added most to Amazon in Q3 2017, an estimated $45.9M increase.
  • Simplex Trading's biggest Q3 2017 reduction was Baidu, cutting an estimated $19.3M.
  • Simplex Trading fully exited State Street SPDR S&P 500 ETF Trust in Q3 2017, selling an estimated $43.6M.
  • Simplex Trading's ten largest holdings make up 24% of its $2.45B portfolio in Q3 2017.
  • Simplex Trading opened 1,313 new positions and closed 1,500 in Q3 2017.
  • Simplex Trading's portfolio value rose 6.4% quarter-over-quarter to $2.45B.

Based on Simplex Trading's 13F filing for Q3 2017, filed 25 Oct 2017.