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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
-4.36%
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
$156B
AUM Growth
-$22.4B
Cap. Flow
-$536M
Cap. Flow %
-0.34%
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 Miscellaneous 98.56%
2 Technology 0.41%
3 Consumer Discretionary 0.22%
4 Healthcare 0.17%
5 Communication Services 0.15%
Name Market Value Portfolio Weight Shares or Principal Change
in Stake 		Capital Flow
VONG icon
9776
Vanguard Russell 1000 Growth ETF
VONG
$46.2B
– –
-57
Closed -$5K
VPG icon
9777
CALL
Vishay Precision Group
VPG
$839M
– –
-500
Closed -$11K
VPG icon
9778
PUT
Vishay Precision Group
VPG
$839M
– –
-200
Closed -$4K
VRA icon
9779
CALL
Vera Bradley
VRA
$95.3M
– –
-5,700
Closed -$22K
VRA icon
9780
PUT
Vera Bradley
VRA
$95.3M
– –
-1,700
Closed -$6K
BTLN
9781
CALL
Brightline Interactive
BTLN
$20M
– –
-26,200
Closed -$64K
BTLN
9782
PUT
Brightline Interactive
BTLN
$20M
– –
-9,800
Closed -$24K
VRCA icon
9783
Verrica Pharmaceuticals
VRCA
$91M
$0 ﹤0.01%
156
-576
-79% -$3.73K
VRE
9784
DELISTED
Veris Residential
VRE
– –
-2,283
Closed -$37K
VRE
9785
PUT
DELISTED
Veris Residential
VRE
– –
-3,700
Closed -$61K
VRNA
9786
DELISTED
Verona Pharma
VRNA
– –
-8,601
Closed -$514K
VRNT
9787
DELISTED
Verint Systems
VRNT
– –
-1,672
Closed -$40K
VRRM icon
9788
Verra Mobility
VRRM
$619M
– –
-6,200
Closed -$149K
VRSK icon
9789
Verisk Analytics
VRSK
$24.2B
– –
-711
Closed -$205K
VSH icon
9790
Vishay Intertechnology
VSH
$4.88B
– –
-2,813
Closed -$48.2K
VSTM icon
9791
Verastem
VSTM
$743M
– –
-13,334
Closed -$81.5K
VSTM icon
9792
PUT
Verastem
VSTM
$743M
– –
-2,300
Closed -$11K
VSTS icon
9793
Vestis
VSTS
$1.75B
– –
-62,336
Closed -$827K
VTEX icon
9794
CALL
VTEX
VTEX
$597M
– –
-1,400
Closed -$8K
VTGN icon
9795
PUT
VistaGen Therapeutics
VTGN
$10.8M
– –
-3,500
Closed -$10K
VTIP icon
9796
Vanguard Short-Term Inflation-Protected Securities Index Fund
VTIP
$20.6B
– –
-45
Closed -$2K
VTR icon
9797
Ventas
VTR
$46.3B
– –
-13,601
Closed -$868K
VTS icon
9798
Vitesse Energy
VTS
$749M
– –
-4,733
Closed -$121K
VTSI icon
9799
VirTra
VTSI
$35M
– –
-7,014
Closed -$41.9K
VUZI icon
9800
Vuzix
VUZI
$206M
– –
-112,619
Closed -$369K
390 391
392
393 394

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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's Q1 2025 filing shows 1,566 new, 3,139 increased, 3,654 reduced and 1,547 closed positions. Its largest new stake was iShares 20+ Year Treasury Bond ETF: 3,057,978 shares worth $278M. The largest sale was Apple, an estimated $518M.

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 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.