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 | |
|---|---|---|---|---|---|---|
3151
PUT
Amplify Junior Silver Miners ETF
SILJ
$3.29B
| $577K | ﹤0.01% |
63,900
-45,400
| -42% | -$472K |
|
3152
TAL Education Group
TAL
$5.86B
| $577K | ﹤0.01% |
96,938
-64,539
| -40% | -$386K |
|
3153
CALL
Rocket Pharmaceuticals
RCKT
$355M
| $576K | ﹤0.01% |
29,000
+22,400
| +339% | +$453K |
|
3154
CALL
United States Brent Oil Fund
BNO
$755M
| $575K | ﹤0.01% |
22,600
-34,100
| -60% | -$891K |
|
3155
PUT
Lamar Advertising Co
LAMR
$16.3B
| $575K | ﹤0.01% |
5,800
+3,900
| +205% | +$378K |
|
3156
PUT
Olin
OLN
$2.49B
| $575K | ﹤0.01% |
11,200
-26,600
| -70% | -$1.41M |
|
3157
PUT
Teledyne Technologies
TDY
$30.2B
| $575K | ﹤0.01% |
1,400
-4,900
| -78% | -$2.02M |
|
3158
CALL
Coursera
COUR
$1.61B
| $574K | ﹤0.01% |
44,100
-38,700
| -47% | -$463K |
|
3159
CALL
RLI Corp
RLI
$5.88B
| $573K | ﹤0.01% |
+8,400
| New | +$558K |
|
|
SYRS
3160
CALL
DELISTED
Syros Pharmaceuticals, Inc. Common Stock
SYRS
| $573K | ﹤0.01% |
182,200
| – | – |
|
|
ESTE
3161
CALL
DELISTED
Earthstone Energy Inc. Class A Common Stock
ESTE
| $573K | ﹤0.01% |
40,100
-41,900
| -51% | -$559K |
|
3162
PUT
Gold Fields
GFI
$29.4B
| $572K | ﹤0.01% |
41,400
-87,400
| -68% | -$1.33M |
|
|
DSKE
3163
PUT
DELISTED
Daseke, Inc. Common Stock
DSKE
| $572K | ﹤0.01% |
80,300
+32,500
| +68% | +$228K |
|
3164
CALL
MSC Industrial Direct
MSM
$7.07B
| $571K | ﹤0.01% |
6,000
+3,200
| +114% | +$293K |
|
3165
CALL
Talos Energy
TALO
$2.36B
| $571K | ﹤0.01% |
41,200
+16,800
| +69% | +$226K |
|
3166
Stride
LRN
$3.83B
| $570K | ﹤0.01% |
15,335
+12,407
| +424% | +$496K |
|
|
SUPV
3167
CALL
Grupo Supervielle
SUPV
$857M
| $570K | ﹤0.01% |
183,500
+41,700
| +29% | +$102K |
|
|
ACCD
3168
DELISTED
Accolade Inc
ACCD
| $570K | ﹤0.01% |
42,349
+14,811
| +54% | +$192K |
|
3169
Planet Fitness
PLNT
$4.29B
| $568K | ﹤0.01% |
+8,434
| New | +$605K |
|
3170
Veeco
VECO
$2.96B
| $568K | ﹤0.01% |
22,129
+18,470
| +505% | +$406K |
|
3171
CALL
Western Union
WU
$2.55B
| $568K | ﹤0.01% |
48,500
-415,600
| -90% | -$4.79M |
|
3172
PUT
Alliance Resource Partners
ARLP
$3.3B
| $567K | ﹤0.01% |
30,700
+9,800
| +47% | +$188K |
|
3173
Burlington
BURL
$22.5B
| $567K | ﹤0.01% |
3,603
-27,962
| -89% | -$4.8M |
|
3174
CALL
inTEST
INTT
$171M
| $567K | ﹤0.01% |
21,600
-1,300
| -6% | -$28.7K |
|
3175
CALL
Coca-Cola Femsa
KOF
$22.9B
| $566K | ﹤0.01% |
6,800
+400
| +6% | +$34.3K |
|
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.