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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
MSA icon
9226
PUT
Mine Safety
MSA
$6.72B
– –
-300
Closed -$49K
MSGE icon
9227
PUT
Madison Square Garden
MSGE
$3.61B
– –
-100
Closed -$3K
MSGS icon
9228
PUT
Madison Square Garden
MSGS
$9.49B
– –
-200
Closed -$45K
MTG icon
9229
MGIC Investment
MTG
$6.12B
– –
-821
Closed -$19.9K
MTH icon
9230
Meritage Homes
MTH
$4.77B
– –
-1,310
Closed -$98.4K
MTRN icon
9231
CALL
Materion
MTRN
$5.17B
– –
-400
Closed -$39K
MTW icon
9232
PUT
Manitowoc
MTW
$503M
– –
-700
Closed -$6K
MUFG icon
9233
Mitsubishi UFJ Financial
MUFG
$255B
– –
-2,433
Closed -$31.3K
MUSA icon
9234
PUT
Murphy USA
MUSA
$11.5B
– –
-200
Closed -$100K
MUX icon
9235
McEwen Inc
MUX
$1.05B
– –
-51,049
Closed -$398K
MVO
9236
MV Oil Trust
MVO
$6.89M
– –
-5,992
Closed -$36.6K
MX icon
9237
CALL
Magnachip Semiconductor
MX
$133M
– –
-16,200
Closed -$65K
MXCT icon
9238
PUT
MaxCyte
MXCT
$120M
– –
-500
Closed -$2K
MYE icon
9239
Myers Industries
MYE
$1.16B
$0 ﹤0.01%
+3
New +$35
MYPS icon
9240
CALL
PLAYSTUDIOS Inc
MYPS
$84.8M
– –
-34,300
Closed -$63K
NA
9241
Nano Labs
NA
$44.6M
$0 ﹤0.01%
+118
New +$757
NBTB icon
9242
CALL
NBT Bancorp
NBTB
$2.67B
– –
-1,000
Closed -$47K
NCLH icon
9243
Norwegian Cruise Line
NCLH
$8.59B
– –
-171,842
Closed -$4.14M
NEGG icon
9244
CALL
Newegg Commerce
NEGG
$313M
– –
-4,255
Closed -$33K
NERD icon
9245
Roundhill Video Games ETF
NERD
$13.9M
$0 ﹤0.01%
43
+4
+10% +$85
NEWP
9246
CALL
New Pacific Metals
NEWP
$825M
– –
-14,400
Closed -$16K
NFG icon
9247
National Fuel Gas
NFG
$7.8B
– –
-1,022
Closed -$73.5K
NFGC
9248
CALL
New Found Gold
NFGC
$553M
– –
-1,200
Closed -$2K
NGD
9249
DELISTED
New Gold Inc
NGD
– –
-31,433
Closed -$93.2K
NGVC icon
9250
PUT
Vitamin Cottage Natural Grocers
NGVC
$676M
– –
-100
Closed -$3K
368 369
370
371 372

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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.