Simplex Trading Portfolio holdings
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.
Top Buys
| Rank | Stock | Value |
|---|---|---|
| 1 |
Microsoft
MSFT
|
+$53.9M |
| 2 |
iShares 20+ Year Treasury Bond ETF
TLT
|
+$52.9M |
| 3 |
NVIDIA
NVDA
|
+$47.1M |
| 4 |
PayPal
PYPL
|
+$41.7M |
| 5 |
Alphabet (Google) Class C
GOOG
|
+$28.4M |
Top Sells
| Rank | Stock | Value |
|---|---|---|
| 1 |
Apple
AAPL
|
+$51.4M |
| 2 |
Walmart Inc
WMT
|
+$46.4M |
| 3 |
VanEck Oil Services ETF
OIH
|
+$34.2M |
| 4 |
Adobe
ADBE
|
+$33.5M |
| 5 |
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 | |
|---|---|---|---|---|---|---|
976
CALL
Tractor Supply
TSCO
$15.9B
| $8.71M | 0.01% |
197,000
+73,000
| +59% | +$3.34M |
|
977
PUT
Western Alliance Bancorporation
WAL
$9.06B
| $8.71M | 0.01% |
238,800
-234,000
| -49% | -$8.12M |
|
|
TYNS
978
PUT
DELISTED
Direxion Daily 7-10 Year Treasury Bear 1X Shares
TYNS
| $8.71M | 0.01% |
135,300
-105,400
| -44% | -$6.78M |
|
979
CALL
Burlington
BURL
$21.4B
| $8.7M | 0.01% |
55,300
-84,900
| -61% | -$14.6M |
|
980
PUT
O'Reilly Automotive
ORLY
$71.4B
| $8.69M | 0.01% |
136,500
+75,000
| +122% | +$4.58M |
|
981
PUT
DoubleVerify
DV
$1.59B
| $8.67M | 0.01% |
222,800
+197,600
| +784% | +$6.38M |
|
982
PUT
Restaurant Brands International
QSR
$25.1B
| $8.63M | 0.01% |
111,400
+88,800
| +393% | +$6.41M |
|
983
PUT
QuantumScape Corp
QS
$3.15B
| $8.62M | 0.01% |
1,079,100
+505,200
| +88% | +$3.51M |
|
984
CALL
Parker-Hannifin
PH
$124B
| $8.62M | 0.01% |
22,100
+6,400
| +41% | +$2.17M |
|
985
CALL
GoDaddy
GDDY
$11.6B
| $8.59M | 0.01% |
114,400
-35,800
| -24% | -$2.64M |
|
|
986
CALL
Western Alliance Bancorporation
WAL
$9.06B
| $8.59M | 0.01% |
235,600
+26,300
| +13% | +$912K |
|
987
CALL
SAP
SAP
$171B
| $8.58M | 0.01% |
62,700
-31,800
| -34% | -$4.21M |
|
988
CALL
CRISPR Therapeutics
CRSP
$4.68B
| $8.51M | 0.01% |
151,600
+62,400
| +70% | +$3.54M |
|
989
PUT
Duolingo
DUOL
$5.62B
| $8.49M | 0.01% |
59,400
+18,700
| +46% | +$2.68M |
|
990
Spectrum Brands
SPB
$2.01B
| $8.49M | 0.01% |
108,733
+74,783
| +220% | +$5.34M |
|
991
PUT
Sunrun
RUN
$2.48B
| $8.45M | 0.01% |
473,300
-328,500
| -41% | -$6.11M |
|
992
PUT
LyondellBasell Industries
LYB
$19.9B
| $8.45M | 0.01% |
92,000
+7,600
| +9% | +$695K |
|
993
CALL
Fastenal
FAST
$53B
| $8.44M | 0.01% |
286,000
+130,600
| +84% | +$3.57M |
|
994
CALL
Tapestry
TPR
$28.1B
| $8.44M | 0.01% |
197,100
+91,900
| +87% | +$3.83M |
|
995
CALL
MPLX
MPLX
$58.4B
| $8.43M | 0.01% |
248,400
-241,300
| -49% | -$8.24M |
|
996
PUT
Starwood Property Trust
STWD
$6.05B
| $8.41M | 0.01% |
433,600
+226,600
| +109% | +$4.03M |
|
997
Suncor Energy
SU
$78.4B
| $8.41M | 0.01% |
286,900
+39,406
| +16% | +$1.18M |
|
998
PUT
Alaska Air
ALK
$4.99B
| $8.41M | 0.01% |
158,100
-6,600
| -4% | -$300K |
|
999
Strategy Inc
MSTR
$34.2B
| $8.4M | 0.01% |
245,240
+98,300
| +67% | +$2.98M |
|
1000
CALL
Allstate
ALL
$65.5B
| $8.4M | 0.01% |
77,000
-20,500
| -21% | -$2.33M |
|
Similar funds
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.