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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
KEUA
9626
DELISTED
KraneShares European Carbon Allowance Strategy ETF
KEUA
– –
-402
Closed -$11.3K
KEY icon
9627
KeyCorp
KEY
$24.8B
– –
-93,023
Closed -$1.95M
KFRC icon
9628
Kforce
KFRC
$1.03B
– –
-562
Closed -$17.1K
KFRC icon
9629
PUT
Kforce
KFRC
$1.03B
– –
-1,000
Closed -$30.9K
KMI icon
9630
Kinder Morgan
KMI
$72.3B
– –
-37,278
Closed -$1.16M
KMLM icon
9631
KFA Mount Lucas Managed Futures Index Strategy ETF
KMLM
$334M
– –
-985
Closed -$25.6K
KMPR icon
9632
PUT
Kemper
KMPR
$1.62B
– –
-6,600
Closed -$268K
KODK icon
9633
Kodak
KODK
$813M
– –
-12,744
Closed -$97.2K
KOF icon
9634
PUT
Coca-Cola Femsa
KOF
$22.1B
– –
-100
Closed -$9.47K
KOP icon
9635
Koppers
KOP
$984M
– –
-275
Closed -$9.19K
KOS icon
9636
Kosmos Energy
KOS
$1.57B
– –
-139,947
Closed -$263K
KPTI icon
9637
Karyopharm Therapeutics
KPTI
$163M
– –
-32,868
Closed -$251K
KRC icon
9638
CALL
Kilroy Realty
KRC
$4.49B
– –
-2,600
Closed -$97.2K
KREF
9639
KKR Real Estate Finance Trust
KREF
$476M
– –
-2
Closed -$15
KRG icon
9640
Kite Realty
KRG
$5.97B
– –
-463
Closed -$11.4K
KRRO icon
9641
Korro Bio
KRRO
$169M
– –
-28,247
Closed -$311K
KT icon
9642
CALL
KT
KT
$8.57B
– –
-4,300
Closed -$81.6K
KT icon
9643
PUT
KT
KT
$8.57B
– –
-100
Closed -$1.9K
KULR icon
9644
KULR Technology Group
KULR
$135M
– –
-23,155
Closed -$71.9K
KWEB icon
9645
KraneShares CSI China Internet ETF
KWEB
$5.23B
– –
-95,566
Closed -$3.25M
KWR icon
9646
CALL
Quaker Houghton
KWR
$2.64B
– –
-100
Closed -$13.7K
LAB icon
9647
CALL
Standard BioTools
LAB
$320M
– –
-8,500
Closed -$10.9K
LASE icon
9648
Laser Photonics
LASE
$50M
– –
-13,717
Closed -$18.5K
LAUR icon
9649
CALL
Laureate Education
LAUR
$5.05B
– –
-900
Closed -$30.3K
LAZR
9650
CALL
DELISTED
Luminar Technologies
LAZR
– –
-1,787,800
Closed -$143K
384 385
386
387 388

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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.