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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
TRGP icon
9701
Targa Resources
TRGP
$60.9B
– –
-21,454
Closed -$4.26M
TRI icon
9702
PUT
Thomson Reuters
TRI
$38B
– –
-1,378
Closed -$224K
TRIB
9703
Trinity Biotech
TRIB
$6.05M
$0 ﹤0.01%
215
-1,217
-85% -$960
TRIN icon
9704
Trinity Capital
TRIN
$1.58B
– –
-11,646
Closed -$181K
TRMK icon
9705
PUT
Trustmark
TRMK
$2.71B
– –
-2,100
Closed -$74K
TRTX
9706
TPG RE Finance Trust
TRTX
$670M
– –
-41,948
Closed -$355K
TRUE
9707
PUT
DELISTED
TrueCar
TRUE
– –
-1,300
Closed -$4K
TRVI icon
9708
Trevi Therapeutics
TRVI
$2.47B
– –
-24,913
Closed -$119K
TRX icon
9709
TRX Gold Corp
TRX
$280M
$0 ﹤0.01%
+707
New +$223
TSCO icon
9710
Tractor Supply
TSCO
$15.5B
– –
-38,489
Closed -$2.11M
TSLQ icon
9711
Tradr TSLA Bear Daily ETF
TSLQ
$119M
– –
-4,257
Closed -$341K
TSLS icon
9712
Direxion Daily TSLA Bear 1X ETF
TSLS
$74.2M
– –
-745
Closed -$59K
TT icon
9713
Trane Technologies
TT
$105B
– –
-21,761
Closed -$7.86M
TTGT icon
9714
TechTarget
TTGT
$257M
$0 ﹤0.01%
10
-86
-90% -$1.39K
TTGT icon
9715
PUT
TechTarget
TTGT
$257M
– –
-100
Closed -$1K
TTT icon
9716
ProShares UltraPro Short 20+ Year Treasury
TTT
$18.5M
– –
-2,503
Closed -$200K
TURN
9717
CALL
DELISTED
180 Degree Capital
TURN
– –
-1,400
Closed -$5K
TUSK icon
9718
CALL
Mammoth Energy Services
TUSK
$136M
– –
-10,300
Closed -$30K
TVTX icon
9719
Travere Therapeutics
TVTX
$5.23B
– –
-13,242
Closed -$269K
TWO
9720
Two Harbors Investment
TWO
$1.27B
– –
-10,231
Closed -$133K
TX icon
9721
Ternium
TX
$9.11B
– –
-1,476
Closed -$44.7K
TXG icon
9722
10x Genomics
TXG
$6.05B
– –
-5,224
Closed -$65.9K
TXMD icon
9723
TherapeuticsMD
TXMD
$23.6M
$0 ﹤0.01%
233
+188
+418% +$187
TYL icon
9724
Tyler Technologies
TYL
$11.7B
– –
-119
Closed -$70.7K
TZOO icon
9725
Travelzoo
TZOO
$106M
$0 ﹤0.01%
26
-1,758
-99% -$31.6K
387 388
389
390 391

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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.