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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
SHG icon
9551
PUT
Shinhan Financial Group
SHG
$33.2B
– –
-200
Closed -$6K
SHOP icon
9552
Shopify
SHOP
$154B
– –
-14,814
Closed -$1.61M
BNKK
9553
Bonk Inc
BNKK
$9.44M
– –
-459
Closed -$8.2K
BNKK
9554
PUT
Bonk Inc
BNKK
$9.44M
– –
-271
Closed -$6K
SHV icon
9555
iShares 0-1 Year Treasury Bond ETF
SHV
$20.7B
– –
-100
Closed -$11K
SHYF
9556
CALL
DELISTED
The Shyft Group
SHYF
– –
-100
Closed -$1K
SIBN icon
9557
SI-BONE Inc
SIBN
$741M
– –
-895
Closed -$14.4K
SIEB icon
9558
CALL
Siebert Financial
SIEB
$67.6M
– –
-11,000
Closed -$34K
SIFY
9559
CALL
Sify Technologies
SIFY
$1.06B
– –
-2,500
Closed -$7K
SIFY
9560
Sify Technologies
SIFY
$1.06B
$0 ﹤0.01%
+48
New +$191
SIG icon
9561
Signet Jewelers
SIG
$3.52B
– –
-32,449
Closed -$1.86M
SIRI icon
9562
SiriusXM
SIRI
$10B
– –
-140,381
Closed -$3.31M
SITC icon
9563
PUT
SITE Centers
SITC
$224M
– –
-100
Closed -$1K
SITE icon
9564
PUT
SiteOne Landscape Supply
SITE
$4.57B
– –
-200
Closed -$26K
SKIN icon
9565
PUT
SkinHealth Systems
SKIN
$97.8M
– –
-11,700
Closed -$18K
SKRE icon
9566
Tuttle Capital Daily 2X Inverse Regional Banks ETF
SKRE
$5.15M
– –
-914
Closed -$12K
SKT icon
9567
Tanger
SKT
$4.76B
– –
-1,142
Closed -$38.4K
SKWD icon
9568
Skyward Specialty Insurance
SKWD
$2.35B
$0 ﹤0.01%
13
-40
-75% -$1.93K
SKY icon
9569
PUT
Champion Homes
SKY
$4.5B
– –
-100
Closed -$8K
SKX
9570
DELISTED
Skechers
SKX
– –
-14,203
Closed -$924K
SKYT icon
9571
SkyWater Technology
SKYT
$1.52B
– –
-13,231
Closed -$130K
SLF icon
9572
Sun Life Financial
SLF
$45.1B
$0 ﹤0.01%
+5
New +$285
SLGL icon
9573
Sol-Gel Technologies
SLGL
$276M
$0 ﹤0.01%
26
+23
+767% +$170
SLN
9574
Silence Therapeutics
SLN
$559M
$0 ﹤0.01%
251
+200
+392% +$977
SLNO
9575
DELISTED
Soleno Therapeutics
SLNO
– –
-10,216
Closed -$497K
381 382
383
384 385

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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.