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 | |
|---|---|---|---|---|---|---|
276
PUT
Snap
SNAP
$7.5B
| $49.2M | 0.04% |
4,155,500
+519,700
| +14% | +$5.22M |
|
277
CALL
Roblox
RBLX
$35.5B
| $48.6M | 0.04% |
1,205,300
-451,800
| -27% | -$18.1M |
|
|
278
PUT
Roblox
RBLX
$35.5B
| $48.3M | 0.04% |
1,197,600
-33,200
| -3% | -$1.33M |
|
279
PUT
Lockheed Martin
LMT
$119B
| $48M | 0.04% |
104,200
-22,700
| -18% | -$10.5M |
|
280
CALL
Moderna
MRNA
$23B
| $47.9M | 0.04% |
394,600
-588,000
| -60% | -$78.4M |
|
|
B
281
CALL
Barrick Mining
B
$62.8B
| $47.8M | 0.04% |
2,823,600
-219,300
| -7% | -$4M |
|
282
CALL
Delta Air Lines
DAL
$54.9B
| $47.6M | 0.04% |
1,000,900
+420,100
| +72% | +$15.5M |
|
283
PUT
Lowe's Companies
LOW
$115B
| $47.6M | 0.04% |
210,800
-370,900
| -64% | -$77.1M |
|
284
PUT
Pinterest
PINS
$12.6B
| $47.5M | 0.04% |
1,737,200
-432,000
| -20% | -$10.8M |
|
285
CALL
Invesco DB US Dollar Index Bullish Fund
UUP
$433M
| $47.5M | 0.04% |
1,920,900
-523,100
| -21% | -$14.7M |
|
286
CALL
Albemarle
ALB
$13.8B
| $47M | 0.04% |
210,900
+53,200
| +34% | +$10.9M |
|
287
CALL
C3.ai
AI
$1.27B
| $47M | 0.04% |
1,291,300
+543,900
| +73% | +$15.3M |
|
288
CALL
Amgen
AMGN
$198B
| $47M | 0.04% |
211,600
-80,600
| -28% | -$18.7M |
|
289
PUT
Ford
F
$57.4B
| $46.3M | 0.04% |
3,061,300
-260,800
| -8% | -$3.3M |
|
290
CALL
Las Vegas Sands
LVS
$30B
| $46.1M | 0.04% |
794,100
+118,300
| +18% | +$7M |
|
291
PUT
DoorDash
DASH
$77.4B
| $45.9M | 0.04% |
601,000
+174,200
| +41% | +$11.6M |
|
292
PUT
SolarEdge
SEDG
$2.91B
| $45.9M | 0.04% |
170,700
-10,900
| -6% | -$3.13M |
|
293
PUT
Datadog
DDOG
$87.5B
| $45.4M | 0.04% |
461,400
-56,300
| -11% | -$4.71M |
|
294
PUT
Trade Desk
TTD
$8.26B
| $44.9M | 0.04% |
581,000
-570,800
| -50% | -$38.6M |
|
295
PUT
Bristol-Myers Squibb
BMY
$124B
| $44.8M | 0.04% |
700,900
-36,600
| -5% | -$2.45M |
|
296
PUT
Regeneron Pharmaceuticals
REGN
$68.3B
| $44.7M | 0.04% |
62,200
-68,200
| -52% | -$52.6M |
|
297
PUT
Generac Holdings
GNRC
$12.6B
| $44.5M | 0.04% |
298,700
-43,600
| -13% | -$4.97M |
|
298
CALL
SLB Ltd
SLB
$71.3B
| $44.4M | 0.04% |
904,900
+83,000
| +10% | +$3.96M |
|
299
CALL
United Rentals
URI
$64.8B
| $44.3M | 0.04% |
99,500
+12,800
| +15% | +$4.74M |
|
300
CALL
BP
BP
$112B
| $44.1M | 0.04% |
1,248,600
-682,500
| -35% | -$25.3M |
|
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.