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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
AAOI icon
4351
Applied Optoelectronics
AAOI
$8.04B
$1K ﹤0.01%
80
-48
-38% -$527
ABG icon
4352
PUT
Asbury Automotive
ABG
$4.19B
$1K ﹤0.01%
+10
New +$772
ABT icon
4353
PUT
Abbott
ABT
$180B
$1K ﹤0.01%
+5
New +$230
ACCO icon
4354
CALL
Acco Brands
ACCO
$369M
$1K ﹤0.01%
+5
New +$40
ACHC icon
4355
PUT
Acadia Healthcare
ACHC
$3.17B
$1K ﹤0.01%
11
+2
+22% +$128
ACIC icon
4356
PUT
American Coastal Insurance
ACIC
$498M
$1K ﹤0.01%
+6
New +$143
ACIW icon
4357
CALL
ACI Worldwide
ACIW
$5.72B
$1K ﹤0.01%
+12
New +$238
ACM icon
4358
CALL
Aecom
ACM
$9.07B
$1K ﹤0.01%
2
-10
-83% -$285
ADEA icon
4359
CALL
Adeia
ADEA
$2.86B
$1K ﹤0.01%
+11
New +$113
ADP icon
4360
CALL
Automatic Data Processing
ADP
$100B
$1K ﹤0.01%
+21
New +$1.81K
AES icon
4361
PUT
AES
AES
$10.6B
$1K ﹤0.01%
+31
New +$388
ALGT icon
4362
PUT
Allegiant Air
ALGT
$2.64B
$1K ﹤0.01%
+6
New +$1.08K
ALKS icon
4363
PUT
Alkermes
ALKS
$8.82B
$1K ﹤0.01%
+2
New +$137
ALLE icon
4364
CALL
Allegion
ALLE
$13B
$1K ﹤0.01%
+8
New +$457
ALLT icon
4365
PUT
Allot
ALLT
$374M
$1K ﹤0.01%
+11
New +$101
ALLY icon
4366
CALL
Ally Financial
ALLY
$13.1B
$1K ﹤0.01%
10
-25
-71% -$527
ALSN icon
4367
PUT
Allison Transmission
ALSN
$10.1B
$1K ﹤0.01%
5
-95
-95% -$3.05K
AMKR icon
4368
Amkor Technology
AMKR
$16.1B
$1K ﹤0.01%
+127
New +$1.03K
AMN icon
4369
AMN Healthcare
AMN
$1.28B
$1K ﹤0.01%
58
+29
+100% +$600
AMN icon
4370
PUT
AMN Healthcare
AMN
$1.28B
$1K ﹤0.01%
+110
New +$2.28K
AMRN
4371
PUT
Amarin Corp
AMRN
$284M
$1K ﹤0.01%
+4
New +$122
ANGI icon
4372
CALL
Angi Inc
ANGI
$224M
$1K ﹤0.01%
+10
New +$590
ANIK icon
4373
PUT
Anika Therapeutics
ANIK
$199M
$1K ﹤0.01%
+10
New +$404
AOS icon
4374
PUT
A.O. Smith
AOS
$8.38B
$1K ﹤0.01%
+38
New +$1.16K
APO icon
4375
CALL
Apollo Global Management
APO
$70.7B
$1K ﹤0.01%
+28
New +$653
173 174
175
176 177

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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.