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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
CSR
5026
PUT
Centerspace
CSR
$936M
– –
-2
Closed -$4K
CTSH icon
5027
PUT
Cognizant
CTSH
$21.5B
– –
-786
Closed -$4K
CURE icon
5028
Direxion Daily Healthcare Bull 3X ETF
CURE
$178M
– –
-190
Closed -$5K
CVE icon
5029
Cenovus Energy
CVE
$54.6B
– –
-10,999
Closed -$203K
CVEO icon
5030
Civeo
CVEO
$379M
– –
-1,073
Closed -$42K
CVLT icon
5031
Commault Systems
CVLT
$5.89B
– –
-238
Closed -$11K
CVLT icon
5032
PUT
Commault Systems
CVLT
$5.89B
– –
-10
Closed -$3K
CX icon
5033
CALL
Cemex
CX
$17.4B
– –
-139
Closed -$1K
CXW icon
5034
CoreCivic
CXW
$3.1B
– –
-4,086
Closed -$161K
CXW icon
5035
PUT
CoreCivic
CXW
$3.1B
– –
-51
Closed -$13K
D icon
5036
Dominion Energy
D
$62.5B
– –
-7,000
Closed -$519K
DAN icon
5037
CALL
Dana Inc
DAN
$2.91B
– –
-148
Closed -$58K
DAR icon
5038
Darling Ingredients
DAR
$9.93B
– –
-1,300
Closed -$21.4K
DBE icon
5039
CALL
Invesco DB Energy Fund
DBE
$93.4M
– –
-176
Closed -$9K
DBE icon
5040
PUT
Invesco DB Energy Fund
DBE
$93.4M
– –
-17
Closed -$8K
DBRG icon
5041
PUT
DigitalBridge
DBRG
$2.94B
– –
-3
Closed -$2K
DD icon
5042
DuPont de Nemours
DD
$18.6B
– –
-4,208
Closed -$499K
DG icon
5043
Dollar General
DG
$25.9B
– –
-44,960
Closed -$3.18M
DHT icon
5044
CALL
DHT Holdings
DHT
$2.97B
– –
-463
Closed -$108K
DHX icon
5045
CALL
DHI Group
DHX
$166M
– –
-3
Closed -$1K
DLB icon
5046
CALL
Dolby
DLB
$4.72B
– –
-59
Closed -$2K
DLNG icon
5047
PUT
Dynagas LNG Partners
DLNG
$131M
– –
-7
Closed -$4K
DRD
5048
PUT
DRDGold
DRD
$1.82B
– –
-10
Closed -$1K
DRN icon
5049
Direxion Daily Real Estate Bull 3X ETF
DRN
$51.4M
– –
-24,324
Closed -$480K
DRV icon
5050
Direxion Daily Real Estate Bear 3X ETF
DRV
$25M
– –
-9
Closed -$9.93K
200 201
202
203 204

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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.