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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
BF.A icon
8951
Brown-Forman Class A
BF.A
$12.4B
$0 ﹤0.01%
+9
New +$586
BFRI icon
8952
Biofrontera
BFRI
$23.9M
$0 ﹤0.01%
+4
New +$42
BGS icon
8953
B&G Foods
BGS
$267M
– –
-3,698
Closed -$53.2K
BIL icon
8954
State Street SPDR Bloomberg 1-3 Month T-Bill ETF
BIL
$46.5B
– –
-1,917
Closed -$176K
BILL icon
8955
BILL Holdings
BILL
$4.19B
– –
-12,158
Closed -$1.15M
KEEL
8956
Keel Infrastructure Corp
KEEL
$2.14B
– –
-28,097
Closed -$32.6K
BIZD icon
8957
VanEck BDC Income ETF
BIZD
$1.69B
$0 ﹤0.01%
46
-849
-95% -$12.4K
BKCH icon
8958
Global X Blockchain ETF
BKCH
$299M
– –
-85
Closed -$1K
BKD icon
8959
Brookdale Senior Living
BKD
$2.81B
– –
-22,794
Closed -$88.1K
BKE icon
8960
Buckle
BKE
$2.22B
– –
-1,408
Closed -$47.2K
BKU icon
8961
Bankunited
BKU
$3.3B
– –
-12,737
Closed -$262K
BKYI
8962
BIO-key International
BKYI
$4.04M
– –
-1
Closed –
BLD
8963
DELISTED
TopBuild
BLD
– –
-1,233
Closed -$271K
BLFS icon
8964
BioLife Solutions
BLFS
$1.72B
– –
-71
Closed -$1.5K
BLFS icon
8965
PUT
BioLife Solutions
BLFS
$1.72B
– –
-1,300
Closed -$28K
BLKB icon
8966
Blackbaud
BLKB
$2.14B
– –
-75
Closed -$5.27K
BLKB icon
8967
PUT
Blackbaud
BLKB
$2.14B
– –
-1,500
Closed -$103K
BLND icon
8968
Blend Labs
BLND
$364M
– –
-69,964
Closed -$62K
BLND icon
8969
PUT
Blend Labs
BLND
$364M
– –
-5,000
Closed -$4K
BLNK icon
8970
Blink Charging
BLNK
$85.3M
– –
-35,628
Closed -$247K
BMEA icon
8971
Biomea Fusion
BMEA
$147M
– –
-15,299
Closed -$479K
BMI icon
8972
PUT
Badger Meter
BMI
$3.84B
– –
-100
Closed -$12K
BMRA icon
8973
PUT
Biomerica
BMRA
$10.6M
– –
-113
Closed -$1K
BMRN icon
8974
BioMarin Pharmaceuticals
BMRN
$12.9B
– –
-9,652
Closed -$908K
BNGO icon
8975
PUT
Bionano Genomics
BNGO
$14.1M
– –
-38
Closed -$24K
357 358
359
360 361

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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.