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 | |
|---|---|---|---|---|---|---|
701
PUT
State Street SPDR Portfolio Europe ETF
SPEU
$718M
| $14.7M | 0.01% |
319,900
-109,200
| -25% | -$4.24M |
|
|
MRO
702
CALL
DELISTED
Marathon Oil Corporation
MRO
| $14.6M | 0.01% |
636,100
-132,100
| -17% | -$3.11M |
|
703
CALL
Royal Gold
RGLD
$17.1B
| $14.6M | 0.01% |
127,200
-25,100
| -16% | -$3.23M |
|
704
CALL
PACCAR
PCAR
$69B
| $14.6M | 0.01% |
174,200
+77,350
| +80% | +$5.72M |
|
705
CALL
Peloton Interactive
PTON
$2.71B
| $14.5M | 0.01% |
1,889,700
-313,800
| -14% | -$2.67M |
|
|
EXE
706
CALL
Expand Energy Corp
EXE
$22.3B
| $14.5M | 0.01% |
173,100
+15,100
| +10% | +$1.2M |
|
707
KraneShares CSI China Internet ETF
KWEB
$5.23B
| $14.5M | 0.01% |
537,540
-444,570
| -45% | -$12.4M |
|
708
CALL
Williams Companies
WMB
$91.1B
| $14.5M | 0.01% |
443,500
+209,200
| +89% | +$6.28M |
|
709
CALL
Becton Dickinson
BDX
$42.2B
| $14.4M | 0.01% |
54,600
-6,700
| -11% | -$1.7M |
|
710
PUT
Veeva Systems
VEEV
$30B
| $14.4M | 0.01% |
72,700
+38,300
| +111% | +$6.99M |
|
711
PUT
On Holding
ONON
$12.2B
| $14.3M | 0.01% |
432,500
-156,100
| -27% | -$4.75M |
|
712
PUT
Bio-Rad Laboratories Class A
BIO
$8.19B
| $14.3M | 0.01% |
37,600
-7,300
| -16% | -$2.97M |
|
|
SCIU
713
CALL
DELISTED
Global X Scientific Beta US ETF
SCIU
| $14.2M | 0.01% |
463,800
-77,000
| -14% | -$2.36M |
|
714
CALL
Danaher
DHR
$126B
| $14.2M | 0.01% |
66,890
-131,187
| -66% | -$27.8M |
|
715
CALL
Kimberly-Clark
KMB
$36.1B
| $14.2M | 0.01% |
102,800
-49,800
| -33% | -$6.93M |
|
716
CALL
Southwest Airlines
LUV
$23.3B
| $14.2M | 0.01% |
390,800
+52,500
| +16% | +$1.65M |
|
717
CALL
Genuine Parts
GPC
$16.6B
| $14.1M | 0.01% |
83,300
+45,600
| +121% | +$7.46M |
|
718
CALL
Fair Isaac
FICO
$28.3B
| $14.1M | 0.01% |
17,400
+6,100
| +54% | +$4.57M |
|
|
HES
719
CALL
DELISTED
Hess
HES
| $14.1M | 0.01% |
103,500
-12,600
| -11% | -$1.72M |
|
720
CALL
Lucid Motors
LCID
$2.65B
| $14M | 0.01% |
203,340
+38,590
| +23% | +$2.75M |
|
721
PUT
Cummins
CMI
$91.2B
| $14M | 0.01% |
57,100
+13,900
| +32% | +$3.15M |
|
|
EXAS
722
CALL
DELISTED
Exact Sciences
EXAS
| $14M | 0.01% |
148,700
+23,000
| +18% | +$1.79M |
|
723
PUT
Stryker
SYK
$119B
| $13.9M | 0.01% |
45,700
-4,200
| -8% | -$1.21M |
|
724
CALL
Kroger
KR
$35.3B
| $13.9M | 0.01% |
296,100
+91,500
| +45% | +$4.36M |
|
725
PUT
Mondelez International
MDLZ
$78.1B
| $13.9M | 0.01% |
190,300
+53,400
| +39% | +$3.95M |
|
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.