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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
NTES icon
9276
NetEase
NTES
$76.8B
– –
-11,619
Closed -$1.17M
NTNX icon
9277
Nutanix
NTNX
$14.2B
– –
-54,639
Closed -$3.78M
NTSX icon
9278
WisdomTree US Efficient Core Fund
NTSX
$1.34B
– –
-100
Closed -$4K
NVCR icon
9279
NovoCure
NVCR
$2.31B
– –
-3,587
Closed -$81.5K
NVDD icon
9280
Direxion Daily NVDA Bear 1X ETF
NVDD
$17.8M
– –
-16
Closed -$1K
NVS icon
9281
Novartis
NVS
$298B
– –
-39,701
Closed -$4.23M
NVT icon
9282
nVent Electric
NVT
$25.6B
– –
-1,173
Closed -$74.2K
NWN icon
9283
Northwest Natural Holdings
NWN
$2.17B
– –
-1,061
Closed -$43.3K
NX icon
9284
PUT
Quanex
NX
$829M
– –
-100
Closed -$2K
NXDT
9285
NexPoint Diversified Real Estate Trust
NXDT
$280M
– –
-86
Closed -$427
NXRT
9286
CALL
NexPoint Residential Trust
NXRT
$661M
– –
-100
Closed -$4K
NXRT
9287
NexPoint Residential Trust
NXRT
$661M
– –
-4
Closed –
NXT icon
9288
Nextpower Inc
NXT
$15.8B
– –
-29,407
Closed -$1.31M
ADAM
9289
PUT
Adamas Trust
ADAM
$771M
– –
-200
Closed -$1K
NYT icon
9290
New York Times
NYT
$11.5B
– –
-20,160
Closed -$1.01M
O icon
9291
Realty Income
O
$60.5B
– –
-18,938
Closed -$1.05M
OABI icon
9292
CALL
OmniAb
OABI
$294M
– –
-1,600
Closed -$5K
OABI icon
9293
OmniAb
OABI
$294M
$0 ﹤0.01%
231
-1,100
-83% -$3.6K
OARK icon
9294
YieldMax Innovation Option Income Strategy ETF
OARK
$51.1M
$0 ﹤0.01%
26
-371
-93% -$17.8K
TEAD
9295
Teads Holding Co
TEAD
$78.5M
– –
-5,078
Closed -$28.7K
TEAD
9296
PUT
Teads Holding Co
TEAD
$78.5M
– –
-200
Closed -$1K
OC icon
9297
Owens Corning
OC
$11.1B
– –
-4,733
Closed -$782K
OCFC icon
9298
CALL
OceanFirst Financial
OCFC
$1.68B
– –
-28,200
Closed -$510K
OCSL icon
9299
Oaktree Specialty Lending
OCSL
$1.02B
– –
-2,366
Closed -$37.1K
OEF icon
9300
iShares S&P 100 ETF
OEF
$19.8B
– –
-414
Closed -$119K
370 371
372
373 374

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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.