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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
+6.46%
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
$122B
AUM Growth
+$7.84B
Cap. Flow
-$3.39B
Cap. Flow %
-2.78%
Top 10 Hldgs %
42.57%
Holding
10,535
New
1,474
Increased
3,350
Reduced
3,913
Closed
1,517

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 Technology 0.41%
2 Healthcare 0.21%
3 Consumer Discretionary 0.21%
4 Communication Services 0.2%
5 Financials 0.15%
Name Market Value Portfolio Weight Shares or Principal Change
in Stake 		Capital Flow
NTCT icon
9601
PUT
NETSCOUT
NTCT
$2.86B
– –
-100
Closed -$2K
NTGR icon
9602
CALL
NETGEAR
NTGR
$672M
– –
-3,100
Closed -$57K
NUVB icon
9603
Nuvation Bio
NUVB
$2.27B
$0 ﹤0.01%
+18
New +$31
NVGS icon
9604
Navigator Holdings
NVGS
$1.31B
– –
-15,944
Closed -$212K
NVNO
9605
CALL
enVVeno Medical
NVNO
$7.13M
– –
-849
Closed -$138K
NVT icon
9606
PUT
nVent Electric
NVT
$25.8B
– –
-200
Closed -$8K
NVX
9607
NOVONIX
NVX
$105M
$0 ﹤0.01%
288
-59
-17% -$165
NVX
9608
PUT
NOVONIX
NVX
$105M
– –
-1,000
Closed -$3K
NWG icon
9609
NatWest
NWG
$71.3B
– –
-6,791
Closed -$44.6K
NWG icon
9610
PUT
NatWest
NWG
$71.3B
– –
-34,900
Closed -$230K
NWN icon
9611
Northwest Natural Holdings
NWN
$2.16B
– –
-87
Closed -$3.93K
NWN icon
9612
PUT
Northwest Natural Holdings
NWN
$2.16B
– –
-1,000
Closed -$47K
NWPX icon
9613
CALL
NWPX Infrastructure Inc
NWPX
$1.28B
– –
-1,300
Closed -$40K
NWPX icon
9614
NWPX Infrastructure Inc
NWPX
$1.28B
– –
-41
Closed -$1K
NX icon
9615
CALL
Quanex
NX
$829M
– –
-500
Closed -$10K
NXPI icon
9616
NXP Semiconductors
NXPI
$69.7B
– –
-9,490
Closed -$1.69M
NXRT
9617
NexPoint Residential Trust
NXRT
$664M
$0 ﹤0.01%
+15
New +$647
ADAM
9618
Adamas Trust
ADAM
$776M
– –
-15,997
Closed -$159K
NZUS
9619
DELISTED
State Street SPDR MSCI USA Climate Paris Aligned ETF
NZUS
– –
-200
Closed -$4K
OABI icon
9620
OmniAb
OABI
$296M
$0 ﹤0.01%
+7
New +$28
ODFL icon
9621
Old Dominion Freight Line
ODFL
$47.8B
– –
-690
Closed -$112K
ODP
9622
DELISTED
ODP
ODP
– –
-658
Closed -$28.3K
OEF icon
9623
iShares S&P 100 ETF
OEF
$19.9B
– –
-2,070
Closed -$402K
OESX icon
9624
CALL
Orion Energy Systems
OESX
$42.6M
– –
-160
Closed -$3K
OESX icon
9625
Orion Energy Systems
OESX
$42.6M
$0 ﹤0.01%
+61
New +$996
383 384
385
386 387

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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, 3,350 increased, 3,913 reduced and 1,517 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 Technology at 0.41% of assets, down from 0.42% a quarter earlier, followed by Healthcare and Consumer Discretionary.

  • 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 1,517 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.