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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
KYMR icon
9101
Kymera Therapeutics
KYMR
$9.08B
– –
-20
Closed -$729
KZIA
9102
CALL
Kazia Therapeutics
KZIA
$149M
– –
-1,160
Closed -$10K
KZIA
9103
Kazia Therapeutics
KZIA
$149M
$0 ﹤0.01%
1
-141
-99% -$834
KZR
9104
DELISTED
Kezar Life Sciences
KZR
– –
-400
Closed -$2.43K
LAB icon
9105
PUT
Standard BioTools
LAB
$343M
– –
-9,200
Closed -$16K
LAC
9106
Lithium Americas
LAC
$1.02B
– –
-98,291
Closed -$296K
LAKE icon
9107
Lakeland Industries
LAKE
$107M
$0 ﹤0.01%
+19
New +$437
LAKE icon
9108
PUT
Lakeland Industries
LAKE
$107M
– –
-500
Closed -$12K
LAMR icon
9109
Lamar Advertising Co
LAMR
$16B
– –
-1,582
Closed -$193K
LASR icon
9110
nLIGHT
LASR
$4.12B
– –
-64
Closed -$644
LAW icon
9111
CS Disco
LAW
$226M
– –
-87
Closed -$423
LAZR
9112
DELISTED
Luminar Technologies
LAZR
– –
-52,941
Closed -$320K
LBRT icon
9113
Liberty Energy
LBRT
$3.2B
– –
-41,253
Closed -$741K
LBTYK icon
9114
Liberty Global Class C
LBTYK
$3.37B
– –
-1,848
Closed -$22.2K
LCTX icon
9115
Lineage Cell Therapeutics
LCTX
$267M
– –
-351
Closed -$206
LDI icon
9116
loanDepot
LDI
$525M
– –
-17,583
Closed -$28.5K
LE icon
9117
CALL
Lands' End
LE
$358M
– –
-100
Closed -$1K
LE icon
9118
PUT
Lands' End
LE
$358M
– –
-1,800
Closed -$23K
LEA icon
9119
Lear
LEA
$7.14B
– –
-240
Closed -$22.8K
LECO icon
9120
PUT
Lincoln Electric
LECO
$13.7B
– –
-100
Closed -$18K
LESL icon
9121
CALL
Leslie's
LESL
$12.4M
– –
-1,970
Closed -$87K
LFVN icon
9122
LifeVantage
LFVN
$79.1M
– –
-10,706
Closed -$202K
LGND icon
9123
CALL
Ligand Pharmaceuticals
LGND
$6.06B
– –
-2,400
Closed -$257K
LGND icon
9124
Ligand Pharmaceuticals
LGND
$6.06B
– –
-542
Closed -$58K
LGND icon
9125
PUT
Ligand Pharmaceuticals
LGND
$6.06B
– –
-100
Closed -$10K
363 364
365
366 367

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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.