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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
RNST icon
9476
CALL
Renasant Corp
RNST
$3.78B
– –
-3,600
Closed -$128K
RNW icon
9477
ReNew
RNW
$2.5B
– –
-5,969
Closed -$38.5K
RNW icon
9478
PUT
ReNew
RNW
$2.5B
– –
-10,100
Closed -$68K
ROAD icon
9479
Construction Partners
ROAD
$5.94B
– –
-403
Closed -$31.8K
ROAD icon
9480
PUT
Construction Partners
ROAD
$5.94B
– –
-800
Closed -$70K
ROBT icon
9481
First Trust Nasdaq Artificial Intelligence and Robotics ETF
ROBT
$772M
– –
-719
Closed -$32K
ROCK icon
9482
Gibraltar Industries
ROCK
$1.4B
– –
-22
Closed -$1.37K
ROG icon
9483
PUT
Rogers Corp
ROG
$2.28B
– –
-100
Closed -$10K
ROK icon
9484
Rockwell Automation
ROK
$48.2B
– –
-3,865
Closed -$1.08M
ROM icon
9485
ProShares Ultra Technology
ROM
$1.27B
– –
-251
Closed -$17K
ROOT icon
9486
Root
ROOT
$877M
– –
-10,654
Closed -$1.22M
RPTX
9487
CALL
DELISTED
Repare Therapeutics
RPTX
– –
-1,000
Closed -$1K
RRGB icon
9488
Red Robin
RRGB
$160M
– –
-5,480
Closed -$28.1K
RRR icon
9489
Red Rock Resorts
RRR
$3.38B
– –
-153
Closed -$7.24K
RS icon
9490
CALL
Reliance Steel & Aluminium
RS
$20.4B
– –
-300
Closed -$80K
RSG icon
9491
Republic Services
RSG
$68.2B
– –
-2,680
Closed -$601K
RSKD icon
9492
CALL
Riskified
RSKD
$860M
– –
-6,700
Closed -$31K
RSKD icon
9493
Riskified
RSKD
$860M
$0 ﹤0.01%
80
-33,479
-100% -$169K
RSP icon
9494
Invesco S&P 500 Equal Weight ETF
RSP
$100B
– –
-16,996
Closed -$2.98M
RSPD icon
9495
Invesco S&P 500 Equal Weight Consumer Discretionary ETF
RSPD
$297M
$0 ﹤0.01%
1
– –
RSPU icon
9496
Invesco S&P 500 Equal Weight Utilities ETF
RSPU
$522M
– –
-73
Closed -$4K
RTH icon
9497
VanEck Retail ETF
RTH
$248M
– –
-96
Closed -$21K
RUSHA icon
9498
PUT
Rush Enterprises Class A
RUSHA
$5.95B
– –
-4,200
Closed -$153K
RVPH
9499
PUT
DELISTED
REVIVA PHARMA HLDGS INC
RVPH
– –
-2,695
Closed -$97K
RVTY icon
9500
Revvity
RVTY
$14.5B
– –
-24
Closed -$2.77K
378 379
380
381 382

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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.