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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
+6.46%
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
$122B
AUM Growth
+$7.84B
Cap. Flow
+$86.7M
Cap. Flow %
0.07%
Top 10 Hldgs %
42.57%
Holding
10,535
New
1,474
Increased
3,349
Reduced
3,911
Closed
1,518

Top Buys

Rank Stock Value
1
MSFT icon
Microsoft
MSFT
+$53.9M
2
TLT icon
iShares 20+ Year Treasury Bond ETF
TLT
+$52.9M
3
NVDA icon
NVIDIA
NVDA
+$47.1M
4
PYPL icon
PayPal
PYPL
+$41.7M
5
GOOG icon
Alphabet (Google) Class C
GOOG
+$28.4M

Top Sells

Rank Stock Value
1
AAPL icon
Apple
AAPL
+$51.4M
2
WMT icon
Walmart Inc
WMT
+$46.4M
3
OIH icon
VanEck Oil Services ETF
OIH
+$34.2M
4
ADBE icon
Adobe
ADBE
+$33.5M
5
SBUX icon
Starbucks
SBUX
+$26.8M

Sector Composition

Rank Sector Weight
1 Miscellaneous 98.43%
2 Technology 0.41%
3 Healthcare 0.21%
4 Consumer Discretionary 0.21%
5 Communication Services 0.21%
Name Market Value Portfolio Weight Shares or Principal Change
in Stake 		Capital Flow
IAS
9376
DELISTED
Integral Ad Science
IAS
– –
-1,103
Closed -$18.6K
IBB icon
9377
iShares Biotechnology ETF
IBB
$10.7B
– –
-42,162
Closed -$5.45M
IBKR icon
9378
Interactive Brokers
IBKR
$42B
– –
-14,400
Closed -$284K
IBIO icon
9379
PUT
iBio
IBIO
$84.2M
– –
-25
Closed -$1K
IBRX icon
9380
ImmunityBio
IBRX
$8.56B
– –
-109,766
Closed -$310K
ICAD
9381
PUT
DELISTED
iCAD Inc
ICAD
– –
-2,000
Closed -$2K
ICL icon
9382
CALL
ICL Group
ICL
$7.58B
– –
-6,800
Closed -$46K
ICL icon
9383
ICL Group
ICL
$7.58B
– –
-200,402
Closed -$1.21M
ICUI icon
9384
ICU Medical
ICUI
$4.19B
– –
-649
Closed -$119K
IDNA icon
9385
iShares Genomics Immunology and Healthcare ETF
IDNA
$260M
– –
-145
Closed -$3K
IDT icon
9386
CALL
IDT Corp
IDT
$1.71B
– –
-5,100
Closed -$173K
IEX icon
9387
CALL
IDEX
IEX
$16.5B
– –
-700
Closed -$161K
IGHG icon
9388
ProShares Investment Grade-Interest Rate Hedged
IGHG
$347M
– –
-300
Closed -$21K
IGMS
9389
CALL
DELISTED
IGM Biosciences
IGMS
– –
-400
Closed -$5K
IGMS
9390
PUT
DELISTED
IGM Biosciences
IGMS
– –
-100
Closed -$1K
IGOV icon
9391
iShares International Treasury Bond ETF
IGOV
$1.55B
– –
-403
Closed -$16K
BRSL
9392
Brightstar Lottery PLC
BRSL
$2.06B
– –
-16,008
Closed -$445K
IHRT icon
9393
CALL
iHeartMedia
IHRT
$435M
– –
-9,700
Closed -$37K
IHS icon
9394
IHS Holding
IHS
$2.87B
– –
-12,820
Closed -$113K
III icon
9395
Information Services Group
III
$251M
$0 ﹤0.01%
+23
New +$119
IIIN icon
9396
Insteel Industries
IIIN
$605M
$0 ﹤0.01%
+1
New +$30
IIPR icon
9397
Innovative Industrial Properties
IIPR
$1.58B
– –
-6,582
Closed -$464K
NBP
9398
CALL
NovaBridge Biosciences American Depositary Shares
NBP
$208M
– –
-3,300
Closed -$11K
IMCR icon
9399
Immunocore
IMCR
$1.86B
– –
-1,394
Closed -$79.6K
INDB icon
9400
Independent Bank
INDB
$3.97B
– –
-167
Closed -$10K
374 375
376
377 378

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Simplex Trading's Q2 2023 Portfolio in Review

As of Q2 2023, Simplex Trading held 10,535 positions worth $122B, up 6.9% from $114B the previous quarter. Its ten largest holdings account for 43% of the portfolio.

Simplex Trading's Q2 2023 filing shows 1,474 new, 3,349 increased, 3,911 reduced and 1,518 closed positions. Its largest new stake was Microsoft: 171,935 shares worth $58.5M. The largest sale was Apple, an estimated $51.4M.

By sector, the portfolio is most concentrated in Miscellaneous at 98% of assets, down from 99% a quarter earlier, followed by Technology and Healthcare.

  • Simplex Trading's largest Q2 2023 buy was Microsoft: 171,935 shares worth $58.5M.
  • Simplex Trading added most to iShares 20+ Year Treasury Bond ETF in Q2 2023, an estimated $52.9M increase.
  • Simplex Trading's biggest Q2 2023 reduction was Adobe, cutting an estimated $33.5M.
  • Simplex Trading fully exited Apple in Q2 2023, selling an estimated $51.4M.
  • Simplex Trading's ten largest holdings make up 43% of its $122B portfolio in Q2 2023.
  • Simplex Trading opened 1,474 new positions and closed 1,518 in Q2 2023.
  • Simplex Trading's portfolio value rose 6.9% quarter-over-quarter to $122B.

Based on Simplex Trading's 13F filing for Q2 2023, filed 4 Aug 2023.