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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
OESX icon
9301
Orion Energy Systems
OESX
$42.8M
$0 ﹤0.01%
56
+26
+87% +$210
OFG icon
9302
CALL
OFG Bancorp
OFG
$2.19B
– –
-400
Closed -$16K
OFG icon
9303
PUT
OFG Bancorp
OFG
$2.19B
– –
-100
Closed -$4K
OGI
9304
PUT
Organigram Holdings
OGI
$130M
– –
-1,400
Closed -$2K
OGN icon
9305
Organon & Co
OGN
$3.55B
– –
-84,541
Closed -$1.3M
OGS icon
9306
ONE Gas
OGS
$5.04B
– –
-814
Closed -$58.7K
OILK icon
9307
ProShares K-1 Free Crude Oil Strategy ETF
OILK
$223M
$0 ﹤0.01%
+6
New +$263
OIS icon
9308
Oil States International
OIS
$533M
– –
-557
Closed -$2.93K
OLED icon
9309
Universal Display
OLED
$3.75B
– –
-1,852
Closed -$277K
OLLI icon
9310
Ollie's Bargain Outlet
OLLI
$3.94B
– –
-5,265
Closed -$557K
OLMA icon
9311
Olema Pharmaceuticals
OLMA
$1.02B
– –
-10,075
Closed -$50.7K
OLMA icon
9312
PUT
Olema Pharmaceuticals
OLMA
$1.02B
– –
-200
Closed -$1K
OLO
9313
CALL
DELISTED
Olo Inc
OLO
– –
-400
Closed -$3K
OLP
9314
One Liberty Properties
OLP
$548M
$0 ﹤0.01%
16
-1,062
-99% -$27.7K
OLP
9315
PUT
One Liberty Properties
OLP
$548M
– –
-1,300
Closed -$35K
OMEX icon
9316
Odyssey Marine Exploration
OMEX
$43.3M
– –
-31,522
Closed -$16.1K
ONEQ icon
9317
Fidelity Nasdaq Composite Index ETF
ONEQ
$10.2B
– –
-553
Closed -$41.3K
ONL
9318
CALL
Orion Office REIT
ONL
$148M
– –
-3,800
Closed -$14K
ONTO icon
9319
Onto Innovation
ONTO
$14.9B
– –
-503
Closed -$84.7K
ONTF
9320
DELISTED
ON24
ONTF
– –
-50
Closed -$310
ONTF
9321
PUT
DELISTED
ON24
ONTF
– –
-200
Closed -$1K
OPAL icon
9322
CALL
OPAL Fuels
OPAL
$72.9M
– –
-2,000
Closed -$6K
OPAL icon
9323
PUT
OPAL Fuels
OPAL
$72.9M
– –
-2,700
Closed -$9K
OPI
9324
DELISTED
Office Properties Income Trust
OPI
– –
-9,955
Closed -$8.5K
OPI
9325
PUT
DELISTED
Office Properties Income Trust
OPI
– –
-1,700
Closed -$1K
371 372
373
374 375

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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.