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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
PAM icon
9351
PUT
Pampa Energía
PAM
$4.8B
– –
-200
Closed -$17K
PANL icon
9352
PUT
Pangaea Logistics
PANL
$489M
– –
-200
Closed -$1K
PARA
9353
DELISTED
Paramount Global Class B
PARA
– –
-105,614
Closed -$1.18M
PATK icon
9354
CALL
Patrick Industries
PATK
$2.87B
– –
-300
Closed -$24K
PAVM icon
9355
PAVmed
PAVM
$33.8M
$0 ﹤0.01%
+8
New +$166
PAX icon
9356
Patria Investments
PAX
$1.74B
– –
-7,666
Closed -$89.4K
PBD icon
9357
Invesco Global Clean Energy ETF
PBD
$192M
– –
-1,200
Closed -$13K
PBPB
9358
DELISTED
Potbelly
PBPB
– –
-4,986
Closed -$55.1K
PBR.A icon
9359
Petrobras Class A
PBR.A
$108B
– –
-2,031
Closed -$24K
PCG icon
9360
PG&E
PCG
$39.9B
– –
-195,320
Closed -$3.24M
PCOR icon
9361
Procore
PCOR
$6.28B
– –
-5,966
Closed -$450K
PCTY icon
9362
PUT
Paylocity
PCTY
$6.47B
– –
-200
Closed -$39K
PCVX icon
9363
Vaxcyte
PCVX
$8.09B
– –
-12,818
Closed -$1.02M
PCYO icon
9364
CALL
Pure Cycle
PCYO
$259M
– –
-100
Closed -$1K
PDFS icon
9365
PUT
PDF Solutions
PDFS
$2.24B
– –
-6,000
Closed -$162K
PDS
9366
Precision Drilling
PDS
$1.11B
– –
-176
Closed -$9.57K
PDSB icon
9367
CALL
PDS Biotechnology
PDSB
$40M
– –
-6,900
Closed -$11K
PEB icon
9368
CALL
Pebblebrook Hotel Trust
PEB
$2.23B
– –
-9,700
Closed -$131K
PECO icon
9369
CALL
Phillips Edison & Co
PECO
$5.46B
– –
-100
Closed -$3K
PEN icon
9370
Penumbra
PEN
$12.4B
– –
-128
Closed -$34.6K
PEY icon
9371
Invesco High Yield Equity Dividend Achievers ETF
PEY
$1.14B
– –
-299
Closed -$6K
PFLT icon
9372
CALL
PennantPark Floating Rate Capital
PFLT
$695M
– –
-18,600
Closed -$203K
PGNY icon
9373
Progyny
PGNY
$2.46B
– –
-28,200
Closed -$607K
PHR icon
9374
Phreesia
PHR
$619M
– –
-928
Closed -$25.2K
PHUN icon
9375
Phunware
PHUN
$44.6M
– –
-46,151
Closed -$177K
373 374
375
376 377

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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.