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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
PCVX icon
9876
Vaxcyte
PCVX
$8.38B
– –
-1,549
Closed -$84.1K
PD icon
9877
PagerDuty
PD
$797M
– –
-32,472
Closed -$281K
PDD icon
9878
Pinduoduo
PDD
$121B
– –
-14,795
Closed -$1.56M
PDFS icon
9879
PDF Solutions
PDFS
$2.05B
– –
-540
Closed -$17.6K
PDM
9880
CALL
Piedmont Realty Trust
PDM
$1.21B
– –
-10,300
Closed -$85.9K
PEB icon
9881
Pebblebrook Hotel Trust
PEB
$2.19B
– –
-26,002
Closed -$319K
PEB icon
9882
PUT
Pebblebrook Hotel Trust
PEB
$2.19B
– –
-143,500
Closed -$1.62M
PEBO icon
9883
CALL
Peoples Bancorp
PEBO
$1.42B
– –
-1,100
Closed -$33K
PEBO icon
9884
PUT
Peoples Bancorp
PEBO
$1.42B
– –
-7,800
Closed -$234K
PEPG icon
9885
PepGen
PEPG
$147M
– –
-43,194
Closed -$243K
PFGC icon
9886
Performance Food Group
PFGC
$17.3B
– –
-2,472
Closed -$226K
PFXF icon
9887
VanEck Preferred Securities ex Financials ETF
PFXF
$2.41B
– –
-293
Closed -$5.17K
PGNY icon
9888
PUT
Progyny
PGNY
$2.53B
– –
-300
Closed -$7.7K
PGY icon
9889
Pagaya Technologies
PGY
$1.45B
– –
-90,760
Closed -$1.44M
PH icon
9890
Parker-Hannifin
PH
$121B
– –
-507
Closed -$480K
PHAT icon
9891
Phathom Pharmaceuticals
PHAT
$849M
– –
-1,599
Closed -$20.2K
PHG icon
9892
Philips
PHG
$25.8B
– –
-10,271
Closed -$291K
PHIN icon
9893
Phinia Inc
PHIN
$2.86B
– –
-99
Closed -$6.21K
PK icon
9894
Park Hotels & Resorts
PK
$2.99B
– –
-3,776
Closed -$41.7K
PLAY icon
9895
Dave & Buster's
PLAY
$352M
– –
-1,161
Closed -$18.6K
PLCE icon
9896
Children's Place
PLCE
$58.7M
– –
-23,846
Closed -$96.7K
PLMR icon
9897
Palomar
PLMR
$3.71B
– –
-188
Closed -$23.5K
PLTK icon
9898
Playtika
PLTK
$1.44B
– –
-93,083
Closed -$305K
PLTK icon
9899
PUT
Playtika
PLTK
$1.44B
– –
-33,800
Closed -$134K
PLYM
9900
CALL
DELISTED
Plymouth Industrial REIT
PLYM
– –
-5,500
Closed -$120K
394 395
396
397 398

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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.