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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
+2.14%
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
$860M
AUM Growth
+$34.4M
Cap. Flow
-$17.8M
Cap. Flow %
-2.07%
Top 10 Hldgs %
14.96%
Holding
6,670
New
1,973
Increased
1,386
Reduced
1,513
Closed
1,643

Top Buys

Rank Stock Value
1
GOOG icon
Alphabet (Google) Class C
GOOG
+$40.1M
2
BRK.B icon
Berkshire Hathaway Class B
BRK.B
+$12.5M
3
BABA icon
Alibaba
BABA
+$10.5M
4
SPY icon
State Street SPDR S&P 500 ETF Trust
SPY
+$9.89M
5
INTC icon
Intel
INTC
+$9.83M

Top Sells

Rank Stock Value
1
AAPL icon
Apple
AAPL
+$35.7M
2
GILD icon
Gilead Sciences
GILD
+$32.3M
3
AMZN icon
Amazon
AMZN
+$29M
4
BKNG icon
Booking.com
BKNG
+$28.4M
5
BIDU icon
Baidu
BIDU
+$13.3M

Sector Composition

Rank Sector Weight
1 Communication Services 7.76%
2 Consumer Discretionary 7.62%
3 Healthcare 7.24%
4 Technology 6.95%
5 Financials 4.83%
Name Market Value Portfolio Weight Shares or Principal Change
in Stake 		Capital Flow
CBT icon
3626
CALL
Cabot Corp
CBT
$4.7B
$4K ﹤0.01%
+8
New +$353
CIG icon
3627
PUT
CEMIG Preferred Shares
CIG
$6.21B
$4K ﹤0.01%
35
-102
-74% -$223
CLB icon
3628
CALL
Core Laboratories
CLB
$493M
$4K ﹤0.01%
+20
New +$2.13K
CMCM
3629
Cheetah Mobile
CMCM
$90.6M
$4K ﹤0.01%
+52
New +$4.86K
CMTL icon
3630
Comtech Telecommunications
CMTL
$51.5M
$4K ﹤0.01%
+152
New +$4.96K
CNP icon
3631
PUT
CenterPoint Energy
CNP
$28.8B
$4K ﹤0.01%
15
-57
-79% -$1.25K
COHU icon
3632
Cohu
COHU
$2B
$4K ﹤0.01%
439
-797
-64% -$9.02K
CSL icon
3633
PUT
Carlisle Companies
CSL
$14.1B
$4K ﹤0.01%
+15
New +$1.38K
CSV icon
3634
CALL
Carriage Services
CSV
$648M
$4K ﹤0.01%
32
-61
-66% -$1.38K
CUBI icon
3635
CALL
Customers Bancorp
CUBI
$2.69B
$4K ﹤0.01%
+3
New +$65
BGMS
3636
PUT
Bio Green Med Solution Inc
BGMS
$4.94M
– –
0
– –
DFS
3637
CALL
DELISTED
Discover Financial Services
DFS
$4K ﹤0.01%
41
+1
+3% +$59
DIN icon
3638
PUT
Dine Brands
DIN
$458M
$4K ﹤0.01%
+33
New +$3.53K
DK icon
3639
PUT
Delek US
DK
$3.85B
$4K ﹤0.01%
20
-49
-71% -$1.62K
DLX icon
3640
PUT
Deluxe
DLX
$1.25B
$4K ﹤0.01%
+24
New +$1.56K
DXLG icon
3641
CALL
Destination XL Group
DXLG
$34.3M
$4K ﹤0.01%
16
-20
-56% -$99
EC icon
3642
PUT
Ecopetrol
EC
$32.5B
$4K ﹤0.01%
13
+6
+86% +$97
ECL icon
3643
PUT
Ecolab
ECL
$79.6B
$4K ﹤0.01%
65
-15
-19% -$1.64K
EGY icon
3644
CALL
Vaalco Energy
EGY
$540M
$4K ﹤0.01%
+72
New +$350
ENOV icon
3645
CALL
Enovis
ENOV
$1.7B
$4K ﹤0.01%
13
+7
+117% +$586
ENPH icon
3646
Enphase Energy
ENPH
$4.79B
$4K ﹤0.01%
334
-4,580
-93% -$59.2K
EQR icon
3647
PUT
Equity Residential
EQR
$25.5B
$4K ﹤0.01%
+12
New +$937
ETD icon
3648
Ethan Allen Interiors
ETD
$606M
$4K ﹤0.01%
+147
New +$4.18K
EXK
3649
PUT
Endeavour Silver
EXK
$2.29B
$4K ﹤0.01%
8
-2
-20% -$5
FARO
3650
CALL
DELISTED
Faro Technologies
FARO
$4K ﹤0.01%
+17
New +$971
144 145
146
147 148

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Simplex Trading's Q1 2015 Portfolio in Review

As of Q1 2015, Simplex Trading held 6,670 positions worth $860M, up 4.2% from $826M the previous quarter. Its ten largest holdings account for 15% of the portfolio.

Simplex Trading's Q1 2015 filing shows 1,973 new, 1,386 increased, 1,513 reduced and 1,643 closed positions. Its largest new stake was Alphabet (Google) Class C: 1,497,580 shares worth $41.4M. The largest sale was Apple, an estimated $35.7M.

By sector, the portfolio is most concentrated in Communication Services at 7.8% of assets, up from 4.8% a quarter earlier, followed by Consumer Discretionary and Healthcare.

  • Simplex Trading's largest Q1 2015 buy was Alphabet (Google) Class C: 1,497,580 shares worth $41.4M.
  • Simplex Trading added most to Alibaba in Q1 2015, an estimated $10.5M increase.
  • Simplex Trading's biggest Q1 2015 reduction was Apple, cutting an estimated $35.7M.
  • Simplex Trading fully exited Amazon in Q1 2015, selling an estimated $29M.
  • Simplex Trading's ten largest holdings make up 15% of its $860M portfolio in Q1 2015.
  • Simplex Trading opened 1,973 new positions and closed 1,643 in Q1 2015.
  • Simplex Trading's portfolio value rose 4.2% quarter-over-quarter to $860M.

Based on Simplex Trading's 13F filing for Q1 2015, filed 21 Apr 2015.