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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
QRVO icon
9426
Qorvo
QRVO
$9.07B
– –
-2,665
Closed -$203K
QTEC icon
9427
CALL
First Trust NASDAQ-100 Technology Index Fund
QTEC
$4.68B
– –
-300
Closed -$56K
QYLG icon
9428
Global X Nasdaq 100 Covered Call & Growth ETF
QYLG
$172M
– –
-686
Closed -$19K
RACE icon
9429
Ferrari
RACE
$72.1B
– –
-3,057
Closed -$1.37M
RAPT
9430
DELISTED
RAPT Therapeutics
RAPT
$0 ﹤0.01%
+32
New +$315
RBC icon
9431
PUT
RBC Bearings
RBC
$15.5B
– –
-1,400
Closed -$418K
RCAT icon
9432
Red Cat Holdings
RCAT
$1.28B
– –
-30,483
Closed -$244K
RCEL icon
9433
CALL
Avita Medical
RCEL
$346M
– –
-7,600
Closed -$97K
RCKT icon
9434
Rocket Pharmaceuticals
RCKT
$424M
– –
-6,096
Closed -$60.2K
RCI icon
9435
Rogers Communications
RCI
$20.3B
– –
-1,632
Closed -$46.1K
RCL icon
9436
Royal Caribbean
RCL
$70.9B
– –
-990
Closed -$234K
RCON icon
9437
Recon Technology
RCON
$648K
$0 ﹤0.01%
1
-2
-67% -$790
RDFN
9438
DELISTED
Redfin
RDFN
– –
-4,385
Closed -$37.5K
RDI icon
9439
Reading International Class A
RDI
$53.6M
$0 ﹤0.01%
+18
New +$26
RDNT icon
9440
RadNet
RDNT
$5.8B
$0 ﹤0.01%
+4
New +$237
RDVI icon
9441
FT Vest Rising Dividend Achievers Target Income ETF
RDVI
$3.79B
– –
-75
Closed -$1K
RDW icon
9442
Redwire
RDW
$2.63B
– –
-744
Closed -$12.3K
REE
9443
CALL
DELISTED
REE Automotive
REE
– –
-200
Closed -$1K
REE
9444
PUT
DELISTED
REE Automotive
REE
– –
-1,300
Closed -$11K
REFI
9445
CALL
Chicago Atlantic Real Estate Finance
REFI
$281M
– –
-2,600
Closed -$40K
REGN icon
9446
Regeneron Pharmaceuticals
REGN
$85.2B
– –
-3,131
Closed -$2.15M
REI icon
9447
Ring Energy
REI
$391M
– –
-27,492
Closed -$35.9K
RELX icon
9448
RELX
RELX
$61.8B
– –
-204
Closed -$9.98K
RELY icon
9449
Remitly
RELY
$5.54B
– –
-11,269
Closed -$258K
REMX icon
9450
VanEck Rare Earth/Strategic Metals ETF
REMX
$2.22B
– –
-118
Closed -$4K
376 377
378
379 380

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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.