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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
+3.04%
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
$2.27B
AUM Growth
-$49.2M
Cap. Flow
-$210M
Cap. Flow %
-9.24%
Top 10 Hldgs %
17.82%
Holding
7,591
New
1,643
Increased
2,060
Reduced
2,267
Closed
1,502

Top Buys

Rank Stock Value
1
TSLA icon
Tesla
TSLA
+$33.5M
2
NFLX icon
Netflix
NFLX
+$22.8M
3
DIA icon
State Street SPDR Dow Jones Industrial Average ETF Trust
DIA
+$20.9M
4
TWX
Time Warner Inc
TWX
+$18.3M
5
BABA icon
Alibaba
BABA
+$15.2M

Top Sells

Rank Stock Value
1
AMZN icon
Amazon
AMZN
+$71.1M
2
MU icon
Micron Technology
MU
+$43.8M
3
GOOG icon
Alphabet (Google) Class C
GOOG
+$26.3M
4
BKNG icon
Booking.com
BKNG
+$22.2M
5
BA icon
Boeing
BA
+$21.6M

Sector Composition

Rank Sector Weight
1 Consumer Discretionary 7.87%
2 Communication Services 7.14%
3 Technology 6.23%
4 Financials 5.5%
5 Healthcare 5.2%
Name Market Value Portfolio Weight Shares or Principal Change
in Stake 		Capital Flow
CBRL icon
6176
Cracker Barrel
CBRL
$1.2B
– –
-273
Closed -$45.2K
CBSH icon
6177
CALL
Commerce Bancshares
CBSH
$8.5B
– –
-53
Closed -$1K
CBZ icon
6178
CBIZ
CBZ
$2.29B
– –
-430
Closed -$7.48K
CCEP icon
6179
CALL
Coca-Cola Europacific Partners
CCEP
$46.5B
– –
-126
Closed -$37K
CCL icon
6180
Carnival Corporation Ltd
CCL
$36.1B
– –
-46,248
Closed -$3.15M
CCK icon
6181
CALL
Crown Holdings
CCK
$12.8B
– –
-13
Closed -$9K
CCOI icon
6182
Cogent Communications
CCOI
$594M
– –
-575
Closed -$25.2K
CCRN
6183
DELISTED
Cross Country Healthcare
CCRN
– –
-1,690
Closed -$21.2K
CDE icon
6184
Coeur Mining
CDE
$15.6B
– –
-12,828
Closed -$103K
CDP icon
6185
COPT Defense Properties
CDP
$4.31B
– –
-613
Closed -$17K
CDP icon
6186
PUT
COPT Defense Properties
CDP
$4.31B
– –
-10
Closed -$1K
CDW icon
6187
CDW
CDW
$17.1B
– –
-1,285
Closed -$93.8K
CE icon
6188
CALL
Celanese
CE
$5.09B
– –
-146
Closed -$39K
CECO icon
6189
PUT
Ceco Environmental
CECO
$4.42B
– –
-73
Closed -$4K
CENTA icon
6190
CALL
Central Garden & Pet Co Class A
CENTA
$2.41B
– –
-13
Closed -$9K
CERS icon
6191
PUT
Cerus
CERS
$587M
– –
-197
Closed -$1K
CFR icon
6192
Cullen/Frost Bankers
CFR
$10.3B
– –
-454
Closed -$47.4K
CGNX icon
6193
Cognex
CGNX
$10.3B
– –
-8,126
Closed -$480K
CHAU icon
6194
Direxion Daily CSI 300 China A Share Bull 2X ETF
CHAU
$90.3M
$0 ﹤0.01%
+20
New +$639
CHD icon
6195
Church & Dwight Co
CHD
$23.1B
– –
-978
Closed -$48.2K
CHDN icon
6196
Churchill Downs
CHDN
$6.03B
– –
-3,204
Closed -$136K
CHE icon
6197
Chemed
CHE
$6.78B
– –
-848
Closed -$225K
CHEF icon
6198
CALL
Chefs' Warehouse
CHEF
$3.87B
– –
-25
Closed -$2K
CHRS icon
6199
CALL
Coherus Oncology
CHRS
$217M
– –
-107
Closed -$2K
CHRS icon
6200
PUT
Coherus Oncology
CHRS
$217M
– –
-435
Closed -$68K
246 247
248
249 250

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Simplex Trading's Q1 2018 Portfolio in Review

As of Q1 2018, Simplex Trading held 7,591 positions worth $2.27B, down 2.1% from $2.32B the previous quarter. Its ten largest holdings account for 18% of the portfolio.

Simplex Trading withdrew a net $210M in Q1 2018, closing 1,502 positions and reducing 2,267 holdings. Its most notable exit was Alphabet (Google) Class C, an estimated $26.3M position sold in full.

By sector, the portfolio is most concentrated in Consumer Discretionary at 7.9% of assets, down from 11% a quarter earlier, followed by Communication Services and Technology.

Against the trend, Simplex Trading opened a new position in Tesla worth $27.1M.

  • Simplex Trading's largest Q1 2018 buy was Tesla: 1,525,035 shares worth $27.1M.
  • Simplex Trading added most to Netflix in Q1 2018, an estimated $22.8M increase.
  • Simplex Trading's biggest Q1 2018 reduction was Amazon, cutting an estimated $71.1M.
  • Simplex Trading fully exited Alphabet (Google) Class C in Q1 2018, selling an estimated $26.3M.
  • Simplex Trading's ten largest holdings make up 18% of its $2.27B portfolio in Q1 2018.
  • Simplex Trading opened 1,643 new positions and closed 1,502 in Q1 2018.
  • Simplex Trading's portfolio value fell 2.1% quarter-over-quarter to $2.27B.

Based on Simplex Trading's 13F filing for Q1 2018, filed 26 Apr 2018.