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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
WAL icon
10301
Western Alliance Bancorporation
WAL
$8.35B
– –
-24,365
Closed -$2.03M
WANT icon
10302
Direxion Daily Consumer Discretionary Bull 3X ETF
WANT
$16.4M
– –
-204
Closed -$10.2K
WAT icon
10303
CALL
Waters Corp
WAT
$43.5B
– –
-5,700
Closed -$2.17M
WBD icon
10304
Warner Bros
WBD
$77.5B
– –
-707,385
Closed -$19.8M
WCC
10305
WESCO International
WCC
$17.8B
– –
-1,341
Closed -$377K
WEC icon
10306
WEC Energy
WEC
$33.1B
– –
-8,535
Closed -$959K
WERN icon
10307
CALL
Werner Enterprises
WERN
$2.01B
– –
-500
Closed -$15K
WEX icon
10308
CALL
WEX
WEX
$6.03B
– –
-400
Closed -$59.6K
WEX icon
10309
WEX
WEX
$6.03B
– –
-52
Closed -$7.75K
WFG icon
10310
CALL
West Fraser Timber
WFG
$5.6B
– –
-100
Closed -$6.11K
WHD icon
10311
Cactus
WHD
$4.48B
– –
-1,449
Closed -$76K
WIMI
10312
PUT
WiMi Hologram Cloud
WIMI
$13.5M
– –
-200
Closed -$474
WIT icon
10313
Wipro
WIT
$16B
– –
-4,052
Closed -$9.87K
WK icon
10314
Workiva
WK
$3.71B
– –
-26
Closed -$1.81K
WK icon
10315
PUT
Workiva
WK
$3.71B
– –
-400
Closed -$34.5K
WKC icon
10316
PUT
World Kinect Corp
WKC
$1.8B
– –
-2,100
Closed -$49.2K
WLK icon
10317
Westlake Corp
WLK
$8.54B
– –
-1,981
Closed -$192K
WLKP icon
10318
Westlake Chemical Partners
WLKP
$760M
– –
-995
Closed -$21.4K
WLY icon
10319
CALL
John Wiley & Sons Class A
WLY
$2.41B
– –
-300
Closed -$9.19K
WMG icon
10320
Warner Music
WMG
$14.2B
– –
-9,103
Closed -$258K
WM icon
10321
Waste Management
WM
$82.5B
– –
-12,363
Closed -$2.84M
WMS icon
10322
CALL
Advanced Drainage Systems
WMS
$9.86B
– –
-400
Closed -$57.9K
WMS icon
10323
Advanced Drainage Systems
WMS
$9.86B
– –
-2,126
Closed -$308K
WMS icon
10324
PUT
Advanced Drainage Systems
WMS
$9.86B
– –
-500
Closed -$72.4K
WOW
10325
CALL
DELISTED
WideOpenWest
WOW
– –
-14,400
Closed -$2.59K
411 412
413
414 415

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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.