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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
+8.29%
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
$114B
AUM Growth
+$21.9B
Cap. Flow
-$49.6M
Cap. Flow %
-0.04%
Top 10 Hldgs %
37.97%
Holding
10,803
New
1,536
Increased
3,663
Reduced
3,631
Closed
1,728

Top Buys

Rank Stock Value
1
WMT icon
Walmart Inc
WMT
+$43.6M
2
AAPL icon
Apple
AAPL
+$40.9M
3
OIH icon
VanEck Oil Services ETF
OIH
+$37.7M
4
C icon
Citigroup
C
+$34.2M
5
TLT icon
iShares 20+ Year Treasury Bond ETF
TLT
+$32.7M

Top Sells

Rank Stock Value
1
AMZN icon
Amazon
AMZN
+$189M
2
QQQ icon
Invesco QQQ Trust
QQQ
+$123M
3
NVDA icon
NVIDIA
NVDA
+$115M
4
TSLA icon
Tesla
TSLA
+$52M
5
META icon
Meta Platforms (Facebook)
META
+$49M

Sector Composition

Rank Sector Weight
1 Miscellaneous 98.51%
2 Technology 0.42%
3 Consumer Discretionary 0.2%
4 Healthcare 0.17%
5 Industrials 0.15%
Name Market Value Portfolio Weight Shares or Principal Change
in Stake 		Capital Flow
WMK icon
10251
CALL
Weis Markets
WMK
$1.78B
– –
-100
Closed -$8K
WOOF icon
10252
Petco
WOOF
$772M
– –
-16,330
Closed -$169K
WOR icon
10253
Worthington Enterprises
WOR
$3.06B
– –
-212
Closed -$7.5K
WPC icon
10254
W.P. Carey
WPC
$16B
– –
-4,260
Closed -$339K
WPM icon
10255
Wheaton Precious Metals
WPM
$70.4B
– –
-158,248
Closed -$6.92M
WRB icon
10256
W.R. Berkley
WRB
$25.7B
– –
-293
Closed -$13.1K
WSFS icon
10257
CALL
WSFS Financial
WSFS
$4.06B
– –
-200
Closed -$9K
WSFS icon
10258
WSFS Financial
WSFS
$4.06B
– –
-30
Closed -$1K
WSR
10259
DELISTED
Whitestone REIT
WSR
– –
-14,195
Closed -$137K
WT icon
10260
WisdomTree
WT
$3.77B
– –
-4,072
Closed -$23.7K
WTAI icon
10261
WisdomTree Artificial Intelligence and Innovation Fund
WTAI
$734M
$0 ﹤0.01%
+35
New +$576
WTRG icon
10262
Essential Utilities
WTRG
$11.8B
– –
-304
Closed -$13.7K
WTS icon
10263
CALL
Watts Water Technologies
WTS
$12.1B
– –
-1,000
Closed -$146K
WTS icon
10264
PUT
Watts Water Technologies
WTS
$12.1B
– –
-200
Closed -$29K
WULF icon
10265
CALL
TeraWulf
WULF
$8.24B
– –
-5,400
Closed -$3K
WWD icon
10266
PUT
Woodward
WWD
$20.4B
– –
-100
Closed -$9K
WWW icon
10267
Wolverine World Wide
WWW
$1.7B
– –
-42,557
Closed -$649K
WYNN icon
10268
Wynn Resorts
WYNN
$9.43B
– –
-22,835
Closed -$2.39M
WYY icon
10269
WidePoint Corp
WYY
$109M
$0 ﹤0.01%
189
-15
-7% -$30
XBIO icon
10270
Xenetic Biosciences
XBIO
$10.9M
$0 ﹤0.01%
+136
New +$660
XBIT icon
10271
XBiotech
XBIT
$67.1M
$0 ﹤0.01%
+85
New +$317
XEL icon
10272
Xcel Energy
XEL
$47.3B
– –
-12,858
Closed -$868K
XGN icon
10273
Exagen
XGN
$184M
$0 ﹤0.01%
235
-312
-57% -$807
XGN icon
10274
PUT
Exagen
XGN
$184M
– –
-1,000
Closed -$2K
XHE icon
10275
State Street SPDR S&P Health Care Equipment ETF
XHE
$179M
– –
-23
Closed -$2K
409 410
411
412 413

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Simplex Trading's Q1 2023 Portfolio in Review

As of Q1 2023, Simplex Trading held 10,803 positions worth $114B, up 24% from $91.9B the previous quarter. Its ten largest holdings account for 38% of the portfolio.

Simplex Trading's Q1 2023 filing shows 1,536 new, 3,663 increased, 3,631 reduced and 1,728 closed positions. Its largest new stake was Walmart Inc: 918,957 shares worth $45.2M. The largest sale was Amazon, an estimated $189M.

By sector, the portfolio is most concentrated in Miscellaneous at 99% of assets, up from 98% a quarter earlier, followed by Technology and Consumer Discretionary.

  • Simplex Trading's largest Q1 2023 buy was Walmart Inc: 918,957 shares worth $45.2M.
  • Simplex Trading added most to Apple in Q1 2023, an estimated $40.9M increase.
  • Simplex Trading's biggest Q1 2023 reduction was Meta Platforms (Facebook), cutting an estimated $49M.
  • Simplex Trading fully exited Amazon in Q1 2023, selling an estimated $189M.
  • Simplex Trading's ten largest holdings make up 38% of its $114B portfolio in Q1 2023.
  • Simplex Trading opened 1,536 new positions and closed 1,728 in Q1 2023.
  • Simplex Trading's portfolio value rose 24% quarter-over-quarter to $114B.

Based on Simplex Trading's 13F filing for Q1 2023, filed 27 Apr 2023.