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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
+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
RAMP icon
9551
LiveRamp
RAMP
$2.3B
– –
-471
Closed -$13.7K
RARE icon
9552
Ultragenyx Pharmaceutical
RARE
$1.51B
– –
-23,991
Closed -$865K
RAVE icon
9553
CALL
RAVE Restaurant Group
RAVE
$43.2M
– –
-600
Closed -$1K
RBBN icon
9554
CALL
Ribbon Communications
RBBN
$356M
– –
-3,500
Closed -$13K
RCEL icon
9555
Avita Medical
RCEL
$346M
– –
-1,130
Closed -$8.22K
RCON icon
9556
Recon Technology
RCON
$648K
– –
-1
Closed –
RDI icon
9557
Reading International Class A
RDI
$53.6M
$0 ﹤0.01%
19
+1
+6% +$1
RDNT icon
9558
CALL
RadNet
RDNT
$5.8B
– –
-4,100
Closed -$203K
RDVT icon
9559
CALL
Red Violet
RDVT
$1.22B
– –
-1,000
Closed -$37K
RDY icon
9560
PUT
Dr. Reddy's Laboratories
RDY
$9.97B
– –
-200
Closed -$2K
REG icon
9561
CALL
Regency Centers
REG
$13.8B
– –
-1,700
Closed -$125K
REG icon
9562
Regency Centers
REG
$13.8B
– –
-7,946
Closed -$568K
REM icon
9563
iShares Mortgage Real Estate ETF
REM
$541M
– –
-8,826
Closed -$198K
LNAI
9564
Lunai Bioworks
LNAI
$10.8M
$0 ﹤0.01%
8
-1
-11% -$28
REVG
9565
PUT
DELISTED
REV Group
REVG
– –
-100
Closed -$3K
REX icon
9566
REX American Resources
REX
$1.38B
– –
-10,804
Closed -$202K
REX icon
9567
PUT
REX American Resources
REX
$1.38B
– –
-19,800
Closed -$371K
REYN icon
9568
CALL
Reynolds Consumer Products
REYN
$4.61B
– –
-7,600
Closed -$181K
REYN icon
9569
PUT
Reynolds Consumer Products
REYN
$4.61B
– –
-500
Closed -$11K
RFIL icon
9570
CALL
RF Industries
RFIL
$114M
– –
-800
Closed -$3K
RGEN icon
9571
Repligen
RGEN
$9.46B
– –
-3,504
Closed -$446K
RGLS
9572
CALL
DELISTED
Regulus Therapeutics
RGLS
– –
-43,300
Closed -$75K
RGP icon
9573
CALL
Resources Connection
RGP
$139M
– –
-2,100
Closed -$13K
RICK icon
9574
RCI Hospitality Holdings
RICK
$224M
– –
-1,259
Closed -$50.8K
RIGL icon
9575
PUT
Rigel Pharmaceuticals
RIGL
$909M
– –
-500
Closed -$8K
381 382
383
384 385

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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.