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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
OPY icon
9326
CALL
Oppenheimer Holdings
OPY
$1.18B
– –
-1,800
Closed -$115K
ORA icon
9327
PUT
Ormat Technologies
ORA
$6.32B
– –
-3,900
Closed -$264K
ORI icon
9328
Old Republic International
ORI
$10.1B
– –
-556
Closed -$20.4K
ORIC icon
9329
Oric Pharmaceuticals
ORIC
$1.15B
$0 ﹤0.01%
+146
New +$1.28K
ORLY icon
9330
O'Reilly Automotive
ORLY
$71.2B
– –
-12,840
Closed -$1.12M
ORN icon
9331
CALL
Orion Group Holdings
ORN
$521M
– –
-3,900
Closed -$28K
ORRF icon
9332
Orrstown Financial Services
ORRF
$824M
– –
-34
Closed -$1K
ORRF icon
9333
PUT
Orrstown Financial Services
ORRF
$824M
– –
-200
Closed -$7K
OSIS icon
9334
OSI Systems
OSIS
$3.5B
– –
-159
Closed -$30.3K
OSUR icon
9335
CALL
OraSure Technologies
OSUR
$274M
– –
-500
Closed -$1K
OSW icon
9336
OneSpaWorld
OSW
$2.61B
– –
-38
Closed –
OSW icon
9337
PUT
OneSpaWorld
OSW
$2.61B
– –
-2,200
Closed -$43K
OTLY
9338
Oatly Group
OTLY
$391M
– –
-5,943
Closed -$64.4K
OTLK icon
9339
PUT
Outlook Therapeutics
OTLK
$249M
– –
-2,000
Closed -$3K
OUNZ icon
9340
CALL
VanEck Merk Gold Trust
OUNZ
$2.51B
– –
-200
Closed -$5K
OUNZ icon
9341
VanEck Merk Gold Trust
OUNZ
$2.51B
– –
-1,086
Closed -$27K
OTTR icon
9342
CALL
Otter Tail
OTTR
$3.88B
– –
-100
Closed -$7K
OTTR icon
9343
Otter Tail
OTTR
$3.88B
– –
-68
Closed -$5K
OTTR icon
9344
PUT
Otter Tail
OTTR
$3.88B
– –
-100
Closed -$7K
OVID icon
9345
Ovid Therapeutics
OVID
$444M
– –
-590
Closed -$363
OXSQ icon
9346
Oxford Square Capital
OXSQ
$152M
– –
-794
Closed -$2.14K
PAA icon
9347
Plains All American Pipeline
PAA
$17.4B
– –
-37,694
Closed -$745K
PACB icon
9348
Pacific Biosciences
PACB
$422M
$0 ﹤0.01%
762
-80,260
-99% -$123K
PAGP icon
9349
Plains GP Holdings
PAGP
$5.24B
– –
-5,307
Closed -$112K
PAGS icon
9350
PagSeguro Digital
PAGS
$2.62B
– –
-9,277
Closed -$69K
372 373
374
375 376

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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.