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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
TBBK icon
9651
The Bancorp
TBBK
$2.73B
– –
-3,494
Closed -$194K
TBBK icon
9652
PUT
The Bancorp
TBBK
$2.73B
– –
-14,800
Closed -$778K
TBF icon
9653
ProShares Short 20+ Year Treasury ETF
TBF
$117M
– –
-4,160
Closed -$102K
TBIL
9654
F/m US Treasury 3 Month Bill Fund
TBIL
$7.22B
– –
-200
Closed -$9K
TBPH icon
9655
Theravance Biopharma
TBPH
$887M
$0 ﹤0.01%
+106
New +$986
TCBK icon
9656
TriCo Bancshares
TCBK
$1.74B
– –
-73
Closed -$3.12K
TCMD icon
9657
PUT
Tactile Systems Technology
TCMD
$495M
– –
-200
Closed -$3K
TD icon
9658
Toronto Dominion Bank
TD
$199B
– –
-21,835
Closed -$1.27M
TDY icon
9659
PUT
Teledyne Technologies
TDY
$28.3B
– –
-200
Closed -$92K
TEAM icon
9660
Atlassian
TEAM
$48B
– –
-9,717
Closed -$2.56M
TECL icon
9661
Direxion Daily Technology Bull 3x ETF
TECL
$5.92B
– –
-2,162
Closed -$176K
TEF
9662
CALL
DELISTED
Telefonica
TEF
– –
-36,100
Closed -$145K
TELA icon
9663
TELA Bio
TELA
$36.9M
$0 ﹤0.01%
+310
New +$762
TEO icon
9664
CALL
Telecom Argentina
TEO
$5.61B
– –
-2,100
Closed -$26K
TFII icon
9665
TFI International
TFII
$11.3B
– –
-97
Closed -$10.7K
TFIN icon
9666
Triumph Financial Inc
TFIN
$1.66B
– –
-66
Closed -$4.81K
TG icon
9667
Tredegar Corp
TG
$270M
– –
-22,615
Closed -$174K
TGLS icon
9668
Tecnoglass Holdings
TGLS
$1.81B
– –
-1,299
Closed -$96.6K
TGTX icon
9669
TG Therapeutics
TGTX
$8.57B
– –
-180,098
Closed -$6.06M
THD icon
9670
iShares MSCI Thailand ETF
THD
$341M
– –
-130
Closed -$7K
THLV icon
9671
THOR Low Volatility ETF
THLV
$56.3M
– –
-11,168
Closed -$307K
THLV icon
9672
PUT
THOR Low Volatility ETF
THLV
$56.3M
– –
-12,800
Closed -$352K
THRD
9673
DELISTED
Third Harmonic Bio
THRD
– –
-153
Closed -$742
THS
9674
DELISTED
Treehouse Foods
THS
– –
-10,929
Closed -$346K
TIMB icon
9675
CALL
TIM SA
TIMB
$8.76B
– –
-1,200
Closed -$14K
385 386
387
388 389

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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.