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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
U icon
9726
Unity
U
$12.6B
– –
-695,344
Closed -$15.7M
UCO icon
9727
ProShares Ultra Bloomberg Crude Oil
UCO
$432M
– –
-2,296
Closed -$63K
UDR icon
9728
PUT
UDR
UDR
$12.8B
– –
-1,400
Closed -$60K
UFI icon
9729
UNIFI
UFI
$118M
$0 ﹤0.01%
133
-90
-40% -$504
UFO icon
9730
CALL
Procure Space ETF
UFO
$631M
– –
-300
Closed -$6K
UFO icon
9731
PUT
Procure Space ETF
UFO
$631M
– –
-100
Closed -$2K
UFPI icon
9732
UFP Industries
UFPI
$4.89B
– –
-75
Closed -$8.37K
UGE icon
9733
ProShares Ultra Consumer Staples
UGE
$10.1M
– –
-247
Closed -$4K
UONE icon
9734
Urban One Class A
UONE
$22.7M
– –
-117
Closed -$1K
UONEK icon
9735
Urban One Class D
UONEK
$20.2M
$0 ﹤0.01%
+40
New +$316
UPBD icon
9736
Upbound Group
UPBD
$1.25B
– –
-469
Closed -$12.9K
UPLD icon
9737
CALL
Upland Software
UPLD
$12.8M
– –
-2,380
Closed -$103K
UPLD icon
9738
PUT
Upland Software
UPLD
$12.8M
– –
-1,750
Closed -$75K
URBN icon
9739
Urban Outfitters
URBN
$6.29B
– –
-36,597
Closed -$2.01M
URNJ icon
9740
Sprott Junior Uranium Miners ETF
URNJ
$320M
– –
-6,724
Closed -$119K
URTH icon
9741
iShares MSCI World ETF
URTH
$8.04B
– –
-45
Closed -$6K
URTY icon
9742
ProShares UltraPro Russell2000
URTY
$332M
– –
-10,931
Closed -$537K
USB icon
9743
US Bancorp
USB
$100B
– –
-3,646
Closed -$174K
USAU icon
9744
US Gold Corp
USAU
$230M
– –
-5,209
Closed -$43.2K
USCI icon
9745
CALL
US Commodity Index
USCI
$373M
– –
-3,000
Closed -$197K
AD
9746
CALL
Array Digital Infrastructure
AD
$3B
– –
-1,400
Closed -$87K
USNA icon
9747
Usana Health Sciences
USNA
$414M
– –
-63
Closed -$2K
UST icon
9748
ProShares Ultra 7-10 Year Treasury
UST
$13.4M
– –
-126
Closed -$5K
UTHY icon
9749
US Treasury 30 Year Bond ETF
UTHY
$164M
– –
-103
Closed -$4K
UTI icon
9750
Universal Technical Institute
UTI
$1.98B
– –
-1,596
Closed -$43K
388 389
390
391 392

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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.