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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
NECB icon
9576
Northeast Community Bancorp
NECB
$364M
– –
-923
Closed -$12.5K
NET icon
9577
Cloudflare
NET
$93.1B
– –
-8,570
Closed -$511K
NEU icon
9578
NewMarket
NEU
$7B
– –
-41
Closed -$14K
NFG icon
9579
National Fuel Gas
NFG
$7.86B
– –
-458
Closed -$24.3K
NFE icon
9580
New Fortress Energy
NFE
$96.7M
– –
-5
Closed -$145
NGS icon
9581
CALL
Natural Gas Services Group
NGS
$500M
– –
-800
Closed -$8K
NGVC icon
9582
Vitamin Cottage Natural Grocers
NGVC
$668M
$0 ﹤0.01%
+4
New +$45
NHI icon
9583
National Health Investors
NHI
$3.87B
$0 ﹤0.01%
15
-178
-92% -$9.17K
NHTC icon
9584
CALL
Natural Health Trends
NHTC
$15.3M
– –
-1,000
Closed -$4K
NHTC icon
9585
Natural Health Trends
NHTC
$15.3M
$0 ﹤0.01%
95
-72
-43% -$394
NMIH icon
9586
CALL
NMI Holdings
NMIH
$3.15B
– –
-300
Closed -$6K
NMIH icon
9587
PUT
NMI Holdings
NMIH
$3.15B
– –
-100
Closed -$2K
NMR icon
9588
Nomura Holdings
NMR
$28.6B
– –
-174
Closed –
NMTC icon
9589
NeuroOne Medical Technologies
NMTC
$16.4M
$0 ﹤0.01%
5
-49
-91% -$397
NNI icon
9590
Nelnet
NNI
$4.7B
– –
-100
Closed -$9K
NOAH
9591
CALL
Noah Holdings
NOAH
$592M
– –
-100
Closed -$1K
NOAH
9592
Noah Holdings
NOAH
$592M
– –
-6,280
Closed -$98.1K
NOBL icon
9593
ProShares S&P 500 Dividend Aristocrats ETF
NOBL
$11.5B
– –
-792
Closed -$36K
NOTV
9594
DELISTED
Inotiv
NOTV
– –
-20,022
Closed -$111K
NOVA
9595
DELISTED
Sunnova Energy
NOVA
– –
-3,260
Closed -$55.3K
NRT
9596
CALL
North European Oil Royalty Trust
NRT
$77.7M
– –
-200
Closed -$2K
NSPR icon
9597
InspireMD
NSPR
$32.5M
– –
-56
Closed -$89
NSSC icon
9598
CALL
Napco Security Technologies
NSSC
$1.26B
– –
-500
Closed -$18K
NTB icon
9599
Bank of N.T. Butterfield & Son
NTB
$2.38B
– –
-1,258
Closed -$32.7K
NTCT icon
9600
NETSCOUT
NTCT
$2.84B
– –
-52
Closed -$1.53K
382 383
384
385 386

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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.