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Simplex Trading

Simplex Trading Portfolio holdings

AUM $149B
1-Year Est. Return 62.07%
 

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
+62.07%
3 Year Est. Return
+116.86%
5 Year Est. Return
+116.02%
10 Year Est. Return
+774.44%
AUM
$149B
AUM Growth
-$28.3B
Cap. Flow
-$18.1B
Cap. Flow %
-12.12%
Top 10 Hldgs %
51.08%
Holding
10,500
New
2,156
Increased
2,652
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 Technology 0.62%
2 Communication Services 0.22%
3 Consumer Discretionary 0.21%
4 Healthcare 0.2%
5 Industrials 0.1%
Name Market Value Portfolio Weight Shares or Principal Change
in Stake 		Capital Flow
AUDC icon
9026
PUT
AudioCodes
AUDC
$250M
– –
-200
Closed -$1.75K
AUPH icon
9027
Aurinia Pharmaceuticals
AUPH
$2.01B
– –
-58,793
Closed -$859K
AVD icon
9028
PUT
American Vanguard Corp
AVD
$71.5M
– –
-700
Closed -$2.67K
AVDL
9029
CALL
DELISTED
Avadel Pharmaceuticals
AVDL
– –
-200
Closed -$310
AVDL
9030
PUT
DELISTED
Avadel Pharmaceuticals
AVDL
– –
-200
Closed -$245
AVNW icon
9031
PUT
Aviat Networks
AVNW
$267M
– –
-200
Closed -$4.28K
AVT icon
9032
Avnet
AVT
$7.37B
– –
-102
Closed -$6.07K
AVT icon
9033
PUT
Avnet
AVT
$7.37B
– –
-400
Closed -$19.2K
AVY icon
9034
CALL
Avery Dennison
AVY
$11.9B
– –
-18,500
Closed -$3.36M
AVUV icon
9035
Avantis US Small Cap Value ETF
AVUV
$29.9B
– –
-303
Closed -$30.9K
AWR icon
9036
CALL
American States Water
AWR
$3.46B
– –
-800
Closed -$58K
AWRE icon
9037
Aware
AWRE
$23.6M
– –
-695
Closed -$1.16K
AX icon
9038
Axos Financial
AX
$5.54B
– –
-9,980
Closed -$909K
AXGN icon
9039
CALL
Axogen
AXGN
$2.1B
– –
-5,600
Closed -$183K
AXS icon
9040
CALL
AXIS Capital
AXS
$8.44B
– –
-700
Closed -$75K
AXSM icon
9041
Axsome Therapeutics
AXSM
$11.4B
– –
-25,222
Closed -$4.36M
AZZ icon
9042
CALL
AZZ Inc
AZZ
$4.43B
– –
-200
Closed -$21.4K
AZO icon
9043
AutoZone
AZO
$48.9B
– –
-5,092
Closed -$18.3M
BA icon
9044
Boeing
BA
$161B
– –
-87,723
Closed -$20M
BAND
9045
PUT
Bandwidth Inc
BAND
$2.25B
– –
-3,000
Closed -$46.4K
BAP icon
9046
Credicorp
BAP
$31.1B
– –
-118
Closed -$39.6K
BATRA icon
9047
Atlanta Braves Holdings Series A
BATRA
$3.62B
– –
-3,938
Closed -$167K
BBDC icon
9048
Barings BDC
BBDC
$878M
– –
-24
Closed -$210
BBCP icon
9049
CALL
Concrete Pumping Holdings
BBCP
$529M
– –
-2,600
Closed -$17.4K
BBH icon
9050
VanEck Biotech ETF
BBH
$396M
– –
-125
Closed -$23.7K
360 361
362
363 364

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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 withdrew a net $18.1B in Q1 2026, closing 1,574 positions and reducing 3,926 holdings. Its most notable exit was Direxion Daily Semiconductor Bull 3X ETF, an estimated $52M position sold in full.

By sector, the portfolio is most concentrated in Technology at 0.62% of assets, up from 0.59% a quarter earlier, followed by Communication Services and Consumer Discretionary.

Against the trend, Simplex Trading opened a new position in Amazon worth $159M.

  • 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 2,156 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.