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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
+0.54%
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
$1.19B
AUM Growth
+$333M
Cap. Flow
+$279M
Cap. Flow %
23.35%
Top 10 Hldgs %
20.47%
Holding
6,639
New
1,607
Increased
1,829
Reduced
1,589
Closed
1,438

Top Buys

Rank Stock Value
1
GOOG icon
Alphabet (Google) Class C
GOOG
+$54.6M
2
AAPL icon
Apple
AAPL
+$29.1M
3
META icon
Meta Platforms (Facebook)
META
+$15.7M
4
IBM icon
IBM
IBM
+$13.8M
5
BIDU icon
Baidu
BIDU
+$10.6M

Top Sells

Rank Stock Value
1
SPY icon
State Street SPDR S&P 500 ETF Trust
SPY
+$10.1M
2
MCD icon
McDonald's
MCD
+$8.46M
3
RL icon
Ralph Lauren
RL
+$5.36M
4
INTC icon
Intel
INTC
+$5.04M
5
WBA
Walgreens Boots Alliance
WBA
+$4.76M

Sector Composition

Rank Sector Weight
1 Communication Services 14.27%
2 Technology 10.3%
3 Healthcare 7.76%
4 Consumer Discretionary 6.32%
5 Financials 5.18%
Name Market Value Portfolio Weight Shares or Principal Change
in Stake 		Capital Flow
WAB icon
5926
CALL
Wabtec
WAB
$50.3B
– –
-1
Closed -$1K
WAB icon
5927
Wabtec
WAB
$50.3B
– –
-12,227
Closed -$1.2M
WAB icon
5928
PUT
Wabtec
WAB
$50.3B
– –
-109
Closed -$1K
WAL icon
5929
Western Alliance Bancorporation
WAL
$9.06B
$0 ﹤0.01%
+14
New +$446
WB icon
5930
Weibo
WB
$1.92B
– –
-27
Closed -$454
WBA
5931
DELISTED
Walgreens Boots Alliance
WBA
– –
-55,207
Closed -$4.76M
WD icon
5932
CALL
Walker & Dunlop
WD
$1.61B
– –
-11
Closed -$5K
WDFC icon
5933
WD-40
WDFC
$3.12B
$0 ﹤0.01%
3
-167
-98% -$14.1K
WEAT icon
5934
Teucrium Wheat Fund
WEAT
$319M
– –
-435
Closed -$23K
WEC icon
5935
PUT
WEC Energy
WEC
$37.4B
– –
-71
Closed -$1K
WEN icon
5936
Wendy's
WEN
$1.37B
– –
-4,500
Closed -$49.6K
WGO icon
5937
Winnebago Industries
WGO
$850M
– –
-547
Closed -$11.6K
WIX icon
5938
WIX.com
WIX
$2.04B
– –
-992
Closed -$22.6K
WIT icon
5939
Wipro
WIT
$17.6B
– –
-901
Closed -$2.04K
WK icon
5940
Workiva
WK
$2.84B
– –
-77
Closed -$1K
WKC icon
5941
World Kinect Corp
WKC
$1.86B
– –
-350
Closed -$20K
WLK icon
5942
CALL
Westlake Corp
WLK
$9.64B
– –
-48
Closed -$5K
WNC icon
5943
Wabash National
WNC
$541M
– –
-11,658
Closed -$162K
WNC icon
5944
PUT
Wabash National
WNC
$541M
– –
-74
Closed -$8K
WNS
5945
CALL
DELISTED
WNS Holdings
WNS
– –
-10
Closed -$4K
WPRT
5946
Westport Fuel Systems
WPRT
$35.9M
– –
-1,870
Closed -$94.3K
WRB icon
5947
CALL
W.R. Berkley
WRB
$27.2B
– –
-47
Closed -$3K
WRB icon
5948
PUT
W.R. Berkley
WRB
$27.2B
– –
-68
Closed -$2K
WRLD icon
5949
World Acceptance Corp
WRLD
$840M
– –
-733
Closed -$58.4K
WSO icon
5950
Watsco Inc
WSO
$14.8B
– –
-771
Closed -$96K
236 237
238
239 240

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Simplex Trading's Q2 2015 Portfolio in Review

As of Q2 2015, Simplex Trading held 6,639 positions worth $1.19B, up 39% from $860M the previous quarter. Its ten largest holdings account for 20% of the portfolio.

Simplex Trading deployed $279M of net new capital in Q2 2015, opening 1,607 new positions and adding to 1,829 existing holdings. Its largest new stake was IBM: 85,948 shares worth $13.4M.

By sector, the portfolio is most concentrated in Communication Services at 14% of assets, up from 7.8% a quarter earlier, followed by Technology and Healthcare.

On the sell side, the largest reduction was Intel, an estimated $5.04M trimmed.

  • Simplex Trading's largest Q2 2015 buy was IBM: 85,948 shares worth $13.4M.
  • Simplex Trading added most to Alphabet (Google) Class C in Q2 2015, an estimated $54.6M increase.
  • Simplex Trading's biggest Q2 2015 reduction was Intel, cutting an estimated $5.04M.
  • Simplex Trading fully exited State Street SPDR S&P 500 ETF Trust in Q2 2015, selling an estimated $10.1M.
  • Simplex Trading's ten largest holdings make up 20% of its $1.19B portfolio in Q2 2015.
  • Simplex Trading opened 1,607 new positions and closed 1,438 in Q2 2015.
  • Simplex Trading's portfolio value rose 39% quarter-over-quarter to $1.19B.

Based on Simplex Trading's 13F filing for Q2 2015, filed 8 Jul 2015.