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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
-4.36%
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
$156B
AUM Growth
-$22.4B
Cap. Flow
-$7.93B
Cap. Flow %
-5.08%
Top 10 Hldgs %
50.56%
Holding
10,070
New
1,566
Increased
3,139
Reduced
3,654
Closed
1,547

Top Buys

Rank Stock Value
1
TLT icon
iShares 20+ Year Treasury Bond ETF
TLT
+$272M
2
GOOGL icon
Alphabet (Google) Class A
GOOGL
+$99M
3
NVDA icon
NVIDIA
NVDA
+$89.9M
4
TSM icon
TSMC
TSM
+$87.7M
5
AMZN icon
Amazon
AMZN
+$61M

Top Sells

Rank Stock Value
1
AAPL icon
Apple
AAPL
+$518M
2
MSTR icon
Strategy Inc
MSTR
+$81.2M
3
BABA icon
Alibaba
BABA
+$66.7M
4
AMD icon
Advanced Micro Devices
AMD
+$44.3M
5
UBER icon
Uber
UBER
+$41.3M

Sector Composition

Rank Sector Weight
1 Technology 0.41%
2 Consumer Discretionary 0.22%
3 Healthcare 0.17%
4 Communication Services 0.15%
5 Financials 0.13%
Name Market Value Portfolio Weight Shares or Principal Change
in Stake 		Capital Flow
WKSP icon
9826
Worksport
WKSP
$8.95M
– –
-5,103
Closed -$46K
WLDN icon
9827
CALL
Willdan Group
WLDN
$1.11B
– –
-2,000
Closed -$76K
WLY icon
9828
CALL
John Wiley & Sons Class A
WLY
$2.61B
– –
-300
Closed -$13K
WMG icon
9829
Warner Music
WMG
$14.4B
– –
-248
Closed -$8.06K
WM icon
9830
Waste Management
WM
$94.2B
– –
-5,732
Closed -$1.27M
WOLF icon
9831
Wolfspeed
WOLF
$1.6B
– –
-278,767
Closed -$1.63M
WOR icon
9832
CALL
Worthington Enterprises
WOR
$2.7B
– –
-1,400
Closed -$56K
WPP icon
9833
WPP
WPP
$3.98B
– –
-5,937
Closed -$264K
WRB icon
9834
W.R. Berkley
WRB
$26.8B
– –
-5,331
Closed -$327K
WRBY icon
9835
Warby Parker
WRBY
$2.99B
– –
-84,800
Closed -$2.02M
WSC icon
9836
WillScot Mobile Mini Holdings
WSC
$4.75B
– –
-166,067
Closed -$5.65M
WSO icon
9837
PUT
Watsco Inc
WSO
$14.7B
– –
-1,500
Closed -$710K
WT icon
9838
PUT
WisdomTree
WT
$3.14B
– –
-2,100
Closed -$22K
WTAI icon
9839
WisdomTree Artificial Intelligence and Innovation Fund
WTAI
$625M
– –
-25
Closed –
WTFC icon
9840
CALL
Wintrust Financial
WTFC
$10.7B
– –
-400
Closed -$49K
WTFC icon
9841
Wintrust Financial
WTFC
$10.7B
– –
-6,196
Closed -$772K
WW
9842
DELISTED
WW International
WW
– –
-17,502
Closed -$15.2K
WWR icon
9843
Westwater Resources
WWR
$55.9M
– –
-85
Closed -$66
WYY icon
9844
WidePoint Corp
WYY
$111M
– –
-2,134
Closed -$8.11K
X
9845
DELISTED
US Steel
X
– –
-350,448
Closed -$13.3M
XAIR icon
9846
PUT
Beyond Air
XAIR
$4.03M
– –
-32
Closed -$4K
XBIT icon
9847
CALL
XBiotech
XBIT
$66.8M
– –
-1,400
Closed -$5K
XEL icon
9848
Xcel Energy
XEL
$49.8B
– –
-29,314
Closed -$2M
XGN icon
9849
Exagen
XGN
$120M
– –
-81
Closed -$306
XLC icon
9850
State Street Communication Services Select Sector SPDR ETF
XLC
$22.6B
– –
-39,855
Closed -$3.86M
392 393
394
395 396

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Simplex Trading's Q1 2025 Portfolio in Review

As of Q1 2025, Simplex Trading held 10,070 positions worth $156B, down 13% from $179B the previous quarter. Its ten largest holdings account for 51% of the portfolio.

Simplex Trading withdrew a net $7.93B in Q1 2025, closing 1,547 positions and reducing 3,654 holdings. Its most notable exit was Alibaba, an estimated $66.7M position sold in full.

By sector, the portfolio is most concentrated in Technology at 0.41% of assets, down from 0.68% a quarter earlier, followed by Consumer Discretionary and Healthcare.

Against the trend, Simplex Trading opened a new position in iShares 20+ Year Treasury Bond ETF worth $278M.

  • Simplex Trading's largest Q1 2025 buy was iShares 20+ Year Treasury Bond ETF: 3,057,978 shares worth $278M.
  • Simplex Trading added most to NVIDIA in Q1 2025, an estimated $89.9M increase.
  • Simplex Trading's biggest Q1 2025 reduction was Apple, cutting an estimated $518M.
  • Simplex Trading fully exited Alibaba in Q1 2025, selling an estimated $66.7M.
  • Simplex Trading's ten largest holdings make up 51% of its $156B portfolio in Q1 2025.
  • Simplex Trading opened 1,566 new positions and closed 1,547 in Q1 2025.
  • Simplex Trading's portfolio value fell 13% quarter-over-quarter to $156B.

Based on Simplex Trading's 13F filing for Q1 2025, filed 12 May 2025.