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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
-4.36%
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
$156B
AUM Growth
-$22.4B
Cap. Flow
-$7.93B
Cap. Flow %
-5.08%
Top 10 Hldgs %
50.56%
Holding
10,070
New
1,566
Increased
3,139
Reduced
3,654
Closed
1,547

Top Buys

Rank Stock Value
1
TLT icon
iShares 20+ Year Treasury Bond ETF
TLT
+$272M
2
GOOGL icon
Alphabet (Google) Class A
GOOGL
+$99M
3
NVDA icon
NVIDIA
NVDA
+$89.9M
4
TSM icon
TSMC
TSM
+$87.7M
5
AMZN icon
Amazon
AMZN
+$61M

Top Sells

Rank Stock Value
1
AAPL icon
Apple
AAPL
+$518M
2
MSTR icon
Strategy Inc
MSTR
+$81.2M
3
BABA icon
Alibaba
BABA
+$66.7M
4
AMD icon
Advanced Micro Devices
AMD
+$44.3M
5
UBER icon
Uber
UBER
+$41.3M

Sector Composition

Rank Sector Weight
1 Technology 0.41%
2 Consumer Discretionary 0.22%
3 Healthcare 0.17%
4 Communication Services 0.15%
5 Financials 0.13%
Name Market Value Portfolio Weight Shares or Principal Change
in Stake 		Capital Flow
PICK icon
9376
iShares MSCI Global Metals & Mining Producers ETF
PICK
$2.21B
– –
-249
Closed -$8K
PII icon
9377
Polaris
PII
$4.22B
– –
-8,300
Closed -$395K
PINS icon
9378
Pinterest
PINS
$12.6B
– –
-119,130
Closed -$4.04M
PJT icon
9379
PUT
PJT Partners
PJT
$4.24B
– –
-100
Closed -$15K
PKE icon
9380
PUT
Park Aerospace
PKE
$728M
– –
-1,000
Closed -$14K
PKX icon
9381
POSCO
PKX
$15.7B
– –
-91
Closed -$4.25K
PLAB icon
9382
Photronics
PLAB
$1.84B
– –
-30,738
Closed -$684K
PLAY icon
9383
Dave & Buster's
PLAY
$355M
– –
-119,523
Closed -$2.83M
PLRX icon
9384
PUT
Pliant Therapeutics
PLRX
$68.1M
– –
-9,200
Closed -$121K
PLUS icon
9385
CALL
ePlus
PLUS
$2.29B
– –
-200
Closed -$14K
PLUS icon
9386
ePlus
PLUS
$2.29B
– –
-64
Closed -$4K
PLYA
9387
DELISTED
Playa Hotels & Resorts
PLYA
– –
-18,681
Closed -$242K
PMVP icon
9388
CALL
PMV Pharmaceuticals
PMVP
$70.9M
– –
-700
Closed -$1K
PMVP icon
9389
PMV Pharmaceuticals
PMVP
$70.9M
– –
-16,935
Closed -$25K
PNFP icon
9390
PUT
Pinnacle Financial Partners Inc
PNFP
$14.7B
– –
-100
Closed -$11K
PNR icon
9391
Pentair
PNR
$10.2B
– –
-21,666
Closed -$2.06M
PNTG icon
9392
CALL
Pennant Group
PNTG
$1.41B
– –
-100
Closed -$2K
PNTG icon
9393
Pennant Group
PNTG
$1.41B
– –
-810
Closed -$21K
POR icon
9394
PUT
Portland General Electric
POR
$6.12B
– –
-600
Closed -$26K
PPBT
9395
CALL
Purple Biotech
PPBT
$1.24M
– –
-90
Closed -$4K
PPBT
9396
PUT
Purple Biotech
PPBT
$1.24M
– –
-140
Closed -$6K
PPIH
9397
CALL
Perma-Pipe International
PPIH
$206M
– –
-200
Closed -$2K
PPL
9398
PPL Corp
PPL
$27.2B
– –
-49,058
Closed -$1.66M
PPSI
9399
PUT
Pioneer Power Solutions
PPSI
$35.7M
– –
-3,200
Closed -$13K
PRA
9400
DELISTED
ProAssurance
PRA
$0 ﹤0.01%
+33
New +$534
374 375
376
377 378

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Simplex Trading's Q1 2025 Portfolio in Review

As of Q1 2025, Simplex Trading held 10,070 positions worth $156B, down 13% from $179B the previous quarter. Its ten largest holdings account for 51% of the portfolio.

Simplex Trading withdrew a net $7.93B in Q1 2025, closing 1,547 positions and reducing 3,654 holdings. Its most notable exit was Alibaba, an estimated $66.7M position sold in full.

By sector, the portfolio is most concentrated in Technology at 0.41% of assets, down from 0.68% a quarter earlier, followed by Consumer Discretionary and Healthcare.

Against the trend, Simplex Trading opened a new position in iShares 20+ Year Treasury Bond ETF worth $278M.

  • Simplex Trading's largest Q1 2025 buy was iShares 20+ Year Treasury Bond ETF: 3,057,978 shares worth $278M.
  • Simplex Trading added most to NVIDIA in Q1 2025, an estimated $89.9M increase.
  • Simplex Trading's biggest Q1 2025 reduction was Apple, cutting an estimated $518M.
  • Simplex Trading fully exited Alibaba in Q1 2025, selling an estimated $66.7M.
  • Simplex Trading's ten largest holdings make up 51% of its $156B portfolio in Q1 2025.
  • Simplex Trading opened 1,566 new positions and closed 1,547 in Q1 2025.
  • Simplex Trading's portfolio value fell 13% quarter-over-quarter to $156B.

Based on Simplex Trading's 13F filing for Q1 2025, filed 12 May 2025.