We are live on ! Find out more
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
+21.82%
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
$175B
AUM Growth
+$18.5B
Cap. Flow
+$450M
Cap. Flow %
0.26%
Top 10 Hldgs %
47.16%
Holding
10,048
New
1,524
Increased
3,308
Reduced
3,590
Closed
1,431

Top Buys

Rank Stock Value
1
NVDA icon
NVIDIA
NVDA
+$172M
2
AAPL icon
Apple
AAPL
+$156M
3
AVGO icon
Broadcom
AVGO
+$101M
4
SPY icon
State Street SPDR S&P 500 ETF Trust
SPY
+$57.2M
5
UNH icon
UnitedHealth
UNH
+$55.1M

Top Sells

Rank Stock Value
1
TLT icon
iShares 20+ Year Treasury Bond ETF
TLT
+$140M
2
AMZN icon
Amazon
AMZN
+$47.9M
3
NFLX icon
Netflix
NFLX
+$38.3M
4
TSM icon
TSMC
TSM
+$37.3M
5
PFE icon
Pfizer
PFE
+$36.9M

Sector Composition

Rank Sector Weight
1 Miscellaneous 98.27%
2 Technology 0.74%
3 Communication Services 0.19%
4 Consumer Discretionary 0.18%
5 Healthcare 0.17%
Name Market Value Portfolio Weight Shares or Principal Change
in Stake 		Capital Flow
SAH icon
9601
Sonic Automotive
SAH
$2.56B
$0 ﹤0.01%
3
-12
-80% -$808
SAIC icon
9602
Saic
SAIC
$5.31B
– –
-386
Closed -$44K
SAR icon
9603
Saratoga Investment
SAR
$284M
$0 ﹤0.01%
1
-567
-100% -$13.7K
SB icon
9604
CALL
Safe Bulkers
SB
$934M
– –
-1,000
Closed -$3K
SBSW icon
9605
Sibanye-Stillwater
SBSW
$9.05B
– –
-102,022
Closed -$558K
SCHA icon
9606
Schwab U.S Small- Cap ETF
SCHA
$22.9B
– –
-27
Closed –
SCHP icon
9607
Schwab US TIPS ETF
SCHP
$16.1B
$0 ﹤0.01%
1
-179
-99% -$4.74K
SCL icon
9608
CALL
Stepan Co
SCL
$1.44B
– –
-100
Closed -$5K
SCLX icon
9609
CALL
Scilex Holding
SCLX
$38.1M
– –
-526
Closed -$3K
SCLX icon
9610
Scilex Holding
SCLX
$38.1M
– –
-708
Closed -$6K
SCO icon
9611
ProShares UltraShort Bloomberg Crude Oil
SCO
$801M
– –
-614
Closed -$41K
SCPH
9612
PUT
DELISTED
scPharmaceuticals
SCPH
– –
-3,400
Closed -$8K
SCS
9613
DELISTED
Steelcase
SCS
– –
-34,533
Closed -$356K
SCS
9614
PUT
DELISTED
Steelcase
SCS
– –
-12,400
Closed -$135K
SDP icon
9615
ProShares UltraShort Utilities
SDP
$4.41M
– –
-295
Closed -$8K
SEAT icon
9616
PUT
Vivid Seats
SEAT
$67.9M
– –
-6,635
Closed -$392K
SEER icon
9617
Seer Inc
SEER
$108M
– –
-712
Closed -$1.43K
SEER icon
9618
PUT
Seer Inc
SEER
$108M
– –
-1,100
Closed -$1K
SEF icon
9619
ProShares Short Financials
SEF
$13M
– –
-1,290
Closed -$44K
SEM
9620
DELISTED
Select Medical
SEM
– –
-3,387
Closed -$52.8K
SEM
9621
PUT
DELISTED
Select Medical
SEM
– –
-100
Closed -$1K
SEMR
9622
DELISTED
Semrush
SEMR
– –
-5,672
Closed -$54.9K
SEMR
9623
PUT
DELISTED
Semrush
SEMR
– –
-1,400
Closed -$13K
SERA icon
9624
Sera Prognostics
SERA
$79.7M
– –
-64
Closed -$158
SETH icon
9625
ProShares Short Ether Strategy ETF
SETH
$12M
– –
-5
Closed –
383 384
385
386 387

Similar funds

Creative Planning
Creative Planning Overland Park, Kansas $171B AUM 24.68% 1-Year Est. Return
First Trust Advisors
First Trust Advisors Wheaton, Illinois $170B AUM 46.21% 1-Year Est. Return
Primecap Management
Primecap Management Pasadena, California $169B AUM 114.72% 1-Year Est. Return
Jennison Associates
Jennison Associates New York $167B AUM 44.17% 1-Year Est. Return
Sumitomo Mitsui Trust Group
Sumitomo Mitsui Trust Group Minato-Ku, Tokyo, Japan $175B AUM 40.63% 1-Year Est. Return
VanEck Associates
VanEck Associates New York $164B AUM 112.45% 1-Year Est. Return
California Public Employees Retirement System
California Public Employees Retirement System Sacramento, California $177B AUM 39.86% 1-Year Est. Return
Victory Capital Management
Victory Capital Management San Antonio, Texas $178B AUM 37.23% 1-Year Est. Return

Simplex Trading's Q2 2025 Portfolio in Review

As of Q2 2025, Simplex Trading held 10,048 positions worth $175B, up 12% from $156B the previous quarter. Its ten largest holdings account for 47% of the portfolio.

Simplex Trading's Q2 2025 filing shows 1,524 new, 3,308 increased, 3,590 reduced and 1,431 closed positions. Its largest new stake was State Street SPDR S&P 500 ETF Trust: 100,129 shares worth $61.9M. The largest sale was iShares 20+ Year Treasury Bond ETF, an estimated $140M.

By sector, the portfolio is most concentrated in Miscellaneous at 98% of assets, down from 99% a quarter earlier, followed by Technology and Communication Services.

  • Simplex Trading's largest Q2 2025 buy was State Street SPDR S&P 500 ETF Trust: 100,129 shares worth $61.9M.
  • Simplex Trading added most to NVIDIA in Q2 2025, an estimated $172M increase.
  • Simplex Trading's biggest Q2 2025 reduction was iShares 20+ Year Treasury Bond ETF, cutting an estimated $140M.
  • Simplex Trading fully exited Constellation Energy in Q2 2025, selling an estimated $35.8M.
  • Simplex Trading's ten largest holdings make up 47% of its $175B portfolio in Q2 2025.
  • Simplex Trading opened 1,524 new positions and closed 1,431 in Q2 2025.
  • Simplex Trading's portfolio value rose 12% quarter-over-quarter to $175B.

Based on Simplex Trading's 13F filing for Q2 2025, filed 5 Aug 2025.