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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
AGM icon
4026
Federal Agricultural Mortgage
AGM
$2.28B
$2K ﹤0.01%
+97
New +$2.88K
ALB icon
4027
PUT
Albemarle
ALB
$13.3B
$2K ﹤0.01%
+22
New +$1.2K
ALGN icon
4028
CALL
Align Technology
ALGN
$12.4B
$2K ﹤0.01%
+9
New +$513
ALSN icon
4029
CALL
Allison Transmission
ALSN
$10.1B
$2K ﹤0.01%
46
+33
+254% +$1.06K
AMG icon
4030
CALL
Affiliated Managers Group
AMG
$9.6B
$2K ﹤0.01%
+1
New +$211
AMG icon
4031
PUT
Affiliated Managers Group
AMG
$9.6B
$2K ﹤0.01%
+60
New +$12.7K
AMWD
4032
CALL
DELISTED
American Woodmark
AMWD
$2K ﹤0.01%
+4
New +$184
ANIK icon
4033
CALL
Anika Therapeutics
ANIK
$202M
$2K ﹤0.01%
+14
New +$566
APEI icon
4034
PUT
American Public Education
APEI
$910M
$2K ﹤0.01%
+8
New +$267
ARCB icon
4035
ArcBest
ARCB
$3.29B
$2K ﹤0.01%
71
-211
-75% -$8.53K
ARLP icon
4036
CALL
Alliance Resource Partners
ARLP
$3.38B
$2K ﹤0.01%
32
+21
+191% +$795
AROC icon
4037
PUT
Archrock
AROC
$6.05B
$2K ﹤0.01%
25
-27
-52% -$823
ASB icon
4038
PUT
Associated Banc-Corp
ASB
$5.8B
$2K ﹤0.01%
+46
New +$833
ASC icon
4039
PUT
Ardmore Shipping
ASC
$675M
$2K ﹤0.01%
+10
New +$109
ASRT
4040
PUT
DELISTED
Assertio
ASRT
– –
0
– –
AVB icon
4041
CALL
AvalonBay Communities
AVB
$27.2B
$2K ﹤0.01%
+9
New +$1.55K
AVT icon
4042
PUT
Avnet
AVT
$6.98B
$2K ﹤0.01%
+32
New +$1.41K
BAH icon
4043
CALL
Booz Allen Hamilton
BAH
$8.65B
$2K ﹤0.01%
+3
New +$87
BCS icon
4044
PUT
Barclays
BCS
$89.1B
$2K ﹤0.01%
22
-47
-68% -$658
BRC icon
4045
CALL
Brady Corp
BRC
$4.64B
$2K ﹤0.01%
7
– –
BSET icon
4046
PUT
Bassett Furniture
BSET
$169M
$2K ﹤0.01%
+40
New +$961
BTI icon
4047
CALL
British American Tobacco
BTI
$135B
$2K ﹤0.01%
+38
New +$2.11K
BXP icon
4048
CALL
Boston Properties
BXP
$11B
$2K ﹤0.01%
20
+14
+233% +$1.95K
BBBY
4049
CALL
Bed Bath & Beyond
BBBY
$493M
$2K ﹤0.01%
12
-11
-48% -$191
CALM icon
4050
CALL
Cal-Maine
CALM
$4.39B
$2K ﹤0.01%
21
+1
+5% +$37
160 161
162
163 164

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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.