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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
+3.1%
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
$149B
AUM Growth
-$28.3B
Cap. Flow
-$294M
Cap. Flow %
-0.2%
Top 10 Hldgs %
51.08%
Holding
10,500
New
2,157
Increased
2,651
Reduced
3,926
Closed
1,574

Top Buys

Rank Stock Value
1
AMZN icon
Amazon
AMZN
+$168M
2
NVDA icon
NVIDIA
NVDA
+$141M
3
TSM icon
TSMC
TSM
+$121M
4
META icon
Meta Platforms (Facebook)
META
+$107M
5
GLD icon
SPDR Gold Trust
GLD
+$103M

Top Sells

Rank Stock Value
1
AAPL icon
Apple
AAPL
+$174M
2
WDC icon
Western Digital
WDC
+$87.7M
3
AVGO icon
Broadcom
AVGO
+$62.2M
4
SOXL icon
Direxion Daily Semiconductor Bull 3X ETF
SOXL
+$52M
5
NFLX icon
Netflix
NFLX
+$44.6M

Sector Composition

Rank Sector Weight
1 Miscellaneous 98.3%
2 Technology 0.62%
3 Communication Services 0.22%
4 Consumer Discretionary 0.21%
5 Healthcare 0.2%
Name Market Value Portfolio Weight Shares or Principal Change
in Stake 		Capital Flow
INNV icon
9576
CALL
InnovAge Holding
INNV
$1.22B
– –
-200
Closed -$1.04K
INSW icon
9577
International Seaways
INSW
$5.44B
– –
-251
Closed -$16.1K
INTA icon
9578
PUT
Intapp
INTA
$2.69B
– –
-5,100
Closed -$234K
INVA icon
9579
Innoviva
INVA
$1.53B
– –
-348
Closed -$7.5K
INVA icon
9580
PUT
Innoviva
INVA
$1.53B
– –
-1,200
Closed -$24K
INVE icon
9581
INVE Technologies, Inc. Common Stock
INVE
$57.2M
– –
-7
Closed -$24
IONS icon
9582
Ionis Pharmaceuticals
IONS
$7.65B
– –
-96,647
Closed -$7.63M
HYFT
9583
MindWalk Holdings
HYFT
$65M
– –
-55,823
Closed -$88.7K
HYFT
9584
PUT
MindWalk Holdings
HYFT
$65M
– –
-2,000
Closed -$3.64K
IPAR icon
9585
CALL
Interparfums
IPAR
$3.68B
– –
-300
Closed -$25.4K
IPAR icon
9586
Interparfums
IPAR
$3.68B
– –
-961
Closed -$91.1K
IQ icon
9587
iQIYI
IQ
$965M
– –
-81,275
Closed -$140K
IQV icon
9588
IQVIA
IQV
$44.2B
– –
-2,124
Closed -$414K
IRBT
9589
CALL
DELISTED
iRobot
IRBT
– –
-669,400
Closed -$73.6K
IRBT
9590
PUT
DELISTED
iRobot
IRBT
– –
-913,500
Closed -$100K
IRMD icon
9591
CALL
iRadimed
IRMD
$1.1B
– –
-400
Closed -$38.9K
IRMD icon
9592
iRadimed
IRMD
$1.1B
– –
-32
Closed -$3.11K
IRMD icon
9593
PUT
iRadimed
IRMD
$1.1B
– –
-4,100
Closed -$399K
IRS
9594
IRSA Inversiones y Representaciones
IRS
$1.19B
– –
-56
Closed -$888
IRTC icon
9595
CALL
iRhythm Holdings
IRTC
$3.76B
– –
-2,700
Closed -$479K
ISPR icon
9596
Ispire Technology
ISPR
$75.1M
– –
-864
Closed -$2.23K
ISRG icon
9597
Intuitive Surgical
ISRG
$146B
– –
-6,141
Closed -$3.11M
ITA icon
9598
iShares US Aerospace & Defense ETF
ITA
$12.3B
– –
-4,727
Closed -$1.01M
IVE icon
9599
iShares S&P 500 Value ETF
IVE
$48.5B
– –
-117
Closed -$24.8K
IWF icon
9600
iShares Russell 1000 Growth ETF
IWF
$128B
– –
-18,212
Closed -$2.15M
382 383
384
385 386

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Simplex Trading's Q1 2026 Portfolio in Review

As of Q1 2026, Simplex Trading held 10,500 positions worth $149B, down 16% from $177B the previous quarter. Its ten largest holdings account for 51% of the portfolio.

Simplex Trading's Q1 2026 filing shows 2,157 new, 2,651 increased, 3,926 reduced and 1,574 closed positions. Its largest new stake was Amazon: 764,884 shares worth $159M. The largest sale was Apple, an estimated $174M.

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

  • Simplex Trading's largest Q1 2026 buy was Amazon: 764,884 shares worth $159M.
  • Simplex Trading added most to NVIDIA in Q1 2026, an estimated $141M increase.
  • Simplex Trading's biggest Q1 2026 reduction was Apple, cutting an estimated $174M.
  • Simplex Trading fully exited Direxion Daily Semiconductor Bull 3X ETF in Q1 2026, selling an estimated $52M.
  • Simplex Trading's ten largest holdings make up 51% of its $149B portfolio in Q1 2026.
  • Simplex Trading opened 2,157 new positions and closed 1,574 in Q1 2026.
  • Simplex Trading's portfolio value fell 16% quarter-over-quarter to $149B.

Based on Simplex Trading's 13F filing for Q1 2026, filed 14 May 2026.