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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
XLRE icon
10801
State Street Real Estate Select Sector SPDR ETF
XLRE
$8.26B
– –
-2,225
Closed -$87K
XLV icon
10802
State Street Health Care Select Sector SPDR ETF
XLV
$44.6B
– –
-140
Closed –
XLY icon
10803
State Street Consumer Discretionary Select Sector SPDR ETF
XLY
$22.3B
– –
-102,684
Closed –
XOS icon
10804
Xos
XOS
$43.4M
– –
-3,091
Closed -$920K
XP icon
10805
XP
XP
$10.1B
– –
-4,993
Closed -$206K
XRAY icon
10806
Dentsply Sirona
XRAY
$2.27B
– –
-6,977
Closed -$460K
XRT icon
10807
State Street SPDR S&P Retail ETF
XRT
$285M
– –
-7,318
Closed -$652K
XYL icon
10808
Xylem
XYL
$24.7B
– –
-3,798
Closed -$434K
YCS icon
10809
ProShares UltraShort Yen
YCS
$26.3M
– –
-7,648
Closed –
YMAB
10810
DELISTED
Y-mAbs Therapeutics
YMAB
– –
-181
Closed -$5K
YMAB
10811
PUT
DELISTED
Y-mAbs Therapeutics
YMAB
– –
-4
Closed -$12K
YORW icon
10812
CALL
York Water
YORW
$553M
– –
-2
Closed -$9K
YORW icon
10813
PUT
York Water
YORW
$553M
– –
-1
Closed -$4K
YUM icon
10814
Yum! Brands
YUM
$41.1B
– –
-8,563
Closed -$1.01M
YXI icon
10815
ProShares Short FTSE China 50 of PROSHARES TRUST
YXI
$4M
– –
-200
Closed -$5K
ZD icon
10816
Ziff Davis
ZD
$1.91B
– –
-3,604
Closed -$396K
ZDGE icon
10817
Zedge
ZDGE
$38.9M
– –
-13,765
Closed -$193K
GTM
10818
ZoomInfo Technologies
GTM
$1.2B
– –
-2,638
Closed -$124K
ZION icon
10819
Zions Bancorporation
ZION
$10.1B
– –
-14,368
Closed -$805K
ZYXI
10820
DELISTED
Zynex
ZYXI
– –
-20,230
Closed -$280K
CPAY icon
10821
Corpay
CPAY
$27.3B
– –
-1,608
Closed -$445K
CNR
10822
Core Natural Resources Inc
CNR
$4.94B
– –
-9,063
Closed -$122K
TEN
10823
Tsakos Energy Navigation Ltd
TEN
$1.32B
– –
-2,136
Closed -$19.6K
TECX
10824
Tectonic Therapeutic
TECX
$601M
– –
-476
Closed -$56.4K
TECX
10825
PUT
Tectonic Therapeutic
TECX
$601M
– –
-4
Closed -$57K
431 432
433
434 435

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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.