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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
OPCH icon
9851
Option Care Health
OPCH
$3.42B
– –
-10,191
Closed -$331K
OPI
9852
CALL
DELISTED
Office Properties Income Trust
OPI
– –
-153,700
Closed -$1.97K
OPI
9853
DELISTED
Office Properties Income Trust
OPI
– –
-45,465
Closed -$581
OPI
9854
PUT
DELISTED
Office Properties Income Trust
OPI
– –
-11,200
Closed -$143
OPRA
9855
Opera Ltd
OPRA
$1.75B
– –
-50,151
Closed -$693K
OPRX icon
9856
OptimizeRx
OPRX
$122M
– –
-4,091
Closed -$38K
ORGN
9857
CALL
DELISTED
Origin Materials
ORGN
– –
-6,667
Closed -$42.3K
OSK icon
9858
Oshkosh
OSK
$9.13B
– –
-4,694
Closed -$732K
OSS icon
9859
One Stop Systems
OSS
$345M
– –
-4,058
Closed -$37.8K
OSUR icon
9860
CALL
OraSure Technologies
OSUR
$262M
– –
-7,500
Closed -$18.1K
OTLY
9861
CALL
Oatly Group
OTLY
$283M
– –
-62,800
Closed -$59.9K
OXY icon
9862
Occidental Petroleum
OXY
$56.2B
– –
-87,446
Closed -$4.4M
PACK icon
9863
Ranpak Holdings
PACK
$561M
– –
-26,615
Closed -$144K
PAGS icon
9864
PagSeguro Digital
PAGS
$2.6B
– –
-15,638
Closed -$163K
PAHC icon
9865
Phibro Animal Health
PAHC
$1.34B
– –
-915
Closed -$43.6K
PAM icon
9866
Pampa Energía
PAM
$4.52B
– –
-1
Closed -$83
PAVE icon
9867
Global X US Infrastructure Development ETF
PAVE
$13.9B
– –
-92
Closed -$4.4K
PAVM icon
9868
PAVmed
PAVM
$41.5M
– –
-35
Closed -$231
PAY icon
9869
Paymentus
PAY
$3.73B
– –
-173
Closed -$4.55K
PAYX icon
9870
Paychex
PAYX
$41B
– –
-10,935
Closed -$1.08M
PB icon
9871
Prosperity Bancshares
PB
$8.75B
– –
-8,639
Closed -$606K
PCH
9872
CALL
DELISTED
PotlatchDeltic
PCH
– –
-15,600
Closed -$621K
PCH
9873
DELISTED
PotlatchDeltic
PCH
– –
-905
Closed -$36K
PCH
9874
PUT
DELISTED
PotlatchDeltic
PCH
– –
-13,500
Closed -$537K
PCRX icon
9875
CALL
Pacira BioSciences
PCRX
$997M
– –
-600
Closed -$15.5K
393 394
395
396 397

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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.