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Simplex Trading

Simplex Trading Portfolio holdings

AUM $171B
1-Year Est. Return 85%
 

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
+22.5%
1 Year Est. Return
+85%
3 Year Est. Return
+183.25%
5 Year Est. Return
+145.21%
10 Year Est. Return
+1,056.84%
AUM
$104B
AUM Growth
+$47.9B
Cap. Flow
+$109M
Cap. Flow %
0.11%
Top 10 Hldgs %
39.88%
Holding
11,184
New
2,248
Increased
6,668
Reduced
1,000
Closed
1,196

Top Buys

Rank Stock Value
1
AMC icon
AMC Entertainment Holdings
AMC
+$39.3M
2
T icon
AT&T
T
+$29.8M
3
NVDA icon
NVIDIA
NVDA
+$28.3M
4
MU icon
Micron Technology
MU
+$22.9M
5
BIDU icon
Baidu
BIDU
+$22.3M

Top Sells

Rank Stock Value
1
QQQ icon
Invesco QQQ Trust
QQQ
+$36.1M
2
TSLA icon
Tesla
TSLA
+$35.2M
3
DIA icon
State Street SPDR Dow Jones Industrial Average ETF Trust
DIA
+$25.9M
4
PLTR icon
Palantir
PLTR
+$25.7M
5
WFC icon
Wells Fargo
WFC
+$20.4M

Sector Composition

Rank Sector Weight
1 Miscellaneous 97.7%
2 Technology 0.48%
3 Consumer Discretionary 0.39%
4 Communication Services 0.28%
5 Healthcare 0.27%
Name Market Value Portfolio Weight Shares or Principal Change
in Stake 		Capital Flow
VIAV icon
10751
Viavi Solutions
VIAV
$8.6B
– –
-19,040
Closed -$321K
VICI icon
10752
VICI Properties
VICI
$28B
– –
-2,460
Closed -$76.3K
VIS icon
10753
Vanguard Industrials ETF
VIS
$8.02B
– –
-45
Closed -$8K
VITL icon
10754
Vital Farms
VITL
$426M
– –
-5,726
Closed -$127K
VIXY icon
10755
ProShares VIX Short-Term Futures ETF
VIXY
$210M
– –
-394
Closed –
VMI icon
10756
CALL
Valmont Industries
VMI
$9.29B
– –
-6
Closed -$142K
VNDA icon
10757
Vanda Pharmaceuticals
VNDA
$328M
– –
-533
Closed -$9.54K
VO icon
10758
Vanguard Morningstar Mid-Cap ETF
VO
$108B
– –
-1,372
Closed -$75K
VOOG icon
10759
Vanguard S&P 500 Growth ETF
VOOG
$27.2B
– –
-29,808
Closed -$1.24M
VOYA icon
10760
Voya Financial
VOYA
$9.43B
– –
-14,767
Closed -$970K
VRSN icon
10761
VeriSign
VRSN
$26.4B
– –
-6,718
Closed -$1.46M
VSEC icon
10762
VSE Corp
VSEC
$5.72B
– –
-11,626
Closed -$534K
VSEC icon
10763
PUT
VSE Corp
VSEC
$5.72B
– –
-2
Closed -$7K
VSHY icon
10764
PUT
Virtus Newfleet Short Duration High Yield Bond ETF
VSHY
$31.5M
– –
-1
Closed -$2K
VST icon
10765
Vistra
VST
$50.1B
– –
-12,155
Closed -$210K
VTWO icon
10766
Vanguard Russell 2000 ETF
VTWO
$17.4B
– –
-1,480
Closed -$131K
VUG icon
10767
Vanguard Morningstar Growth ETF
VUG
$228B
– –
-1,458
Closed -$62K
VVV icon
10768
Valvoline
VVV
$4.09B
– –
-492
Closed -$15.3K
VXF icon
10769
Vanguard Extended Market ETF
VXF
$31.6B
– –
-580
Closed -$102K
VYGR icon
10770
Voyager Therapeutics
VYGR
$216M
– –
-2,642
Closed -$12K
YARW
10771
Yarrow Bioscience
YARW
$80.7M
– –
-8
Closed -$31.7K
WASH icon
10772
PUT
Washington Trust Bancorp
WASH
$768M
– –
-4
Closed -$20K
WAT icon
10773
Waters Corp
WAT
$40.2B
– –
-353
Closed -$112K
WEN icon
10774
Wendy's
WEN
$1.53B
– –
-11,305
Closed -$260K
WFC icon
10775
Wells Fargo
WFC
$272B
– –
-455,784
Closed -$20.4M
429 430
431
432 433

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Simplex Trading's Q2 2021 Portfolio in Review

As of Q2 2021, Simplex Trading held 11,184 positions worth $104B, up 86% from $55.7B the previous quarter. Its ten largest holdings account for 40% of the portfolio.

Simplex Trading's Q2 2021 filing shows 2,248 new, 6,668 increased, 1,000 reduced and 1,196 closed positions. Its largest new stake was AT&T: 1,311,180 shares worth $28.5M. The largest sale was Invesco QQQ Trust, an estimated $36.1M.

By sector, the portfolio is most concentrated in Miscellaneous at 98% of assets, up from 97% a quarter earlier, followed by Technology and Consumer Discretionary.

  • Simplex Trading's largest Q2 2021 buy was AT&T: 1,311,180 shares worth $28.5M.
  • Simplex Trading added most to AMC Entertainment Holdings in Q2 2021, an estimated $39.3M increase.
  • Simplex Trading's biggest Q2 2021 reduction was State Street SPDR Dow Jones Industrial Average ETF Trust, cutting an estimated $25.9M.
  • Simplex Trading fully exited Invesco QQQ Trust in Q2 2021, selling an estimated $36.1M.
  • Simplex Trading's ten largest holdings make up 40% of its $104B portfolio in Q2 2021.
  • Simplex Trading opened 2,248 new positions and closed 1,196 in Q2 2021.
  • Simplex Trading's portfolio value rose 86% quarter-over-quarter to $104B.

Based on Simplex Trading's 13F filing for Q2 2021, filed 12 Aug 2021.