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 |
Boeing
BA
|
+$55.8M |
| 2 |
Microsoft
MSFT
|
+$42.2M |
| 3 |
Pinduoduo
PDD
|
+$41.3M |
| 4 |
Apple
AAPL
|
+$32M |
| 5 |
Direxion Daily Semiconductor Bull 3X ETF
SOXL
|
+$28.3M |
Top Sells
| Rank | Stock | Value |
|---|---|---|
| 1 |
Broadcom
AVGO
|
+$95.2M |
| 2 |
Citigroup
C
|
+$57.2M |
| 3 |
Pfizer
PFE
|
+$56.4M |
| 4 |
TSMC
TSM
|
+$39.7M |
| 5 |
Starbucks
SBUX
|
+$35.5M |
Sector Composition
| Rank | Sector | Weight |
|---|---|---|
| 1 | Technology | 0.4% |
| 2 | Consumer Discretionary | 0.29% |
| 3 | Healthcare | 0.15% |
| 4 | Industrials | 0.13% |
| 5 | Financials | 0.13% |
| Name | Market Value | Portfolio Weight | Shares or Principal |
Change in Stake | Capital Flow | |
|---|---|---|---|---|---|---|
326
PUT
CAVA Group
CAVA
$7.26B
| $44.9M | 0.03% |
362,900
+169,900
| +88% | +$17.3M |
|
327
CALL
Lennar Class A
LEN
$19.8B
| $44.8M | 0.03% |
246,887
+12,912
| +6% | +$2.16M |
|
328
PUT
D.R. Horton
DHI
$40.4B
| $44.7M | 0.03% |
234,300
+71,700
| +44% | +$12.6M |
|
329
CALL
Marathon Digital Holdings
MARA
$4.73B
| $44.6M | 0.03% |
2,750,600
+950,100
| +53% | +$17.2M |
|
330
CALL
Las Vegas Sands
LVS
$30B
| $44.4M | 0.03% |
882,500
+435,500
| +97% | +$17.8M |
|
331
CALL
Vale
VALE
$63.2B
| $44.4M | 0.03% |
3,802,400
+490,200
| +15% | +$5.26M |
|
332
PUT
Intuit
INTU
$77.8B
| $44.4M | 0.03% |
71,500
+7,600
| +12% | +$4.85M |
|
333
CALL
Nu Holdings
NU
$70.1B
| $44.1M | 0.03% |
3,231,700
+1,114,500
| +53% | +$15M |
|
334
PUT
Charter Communications
CHTR
$15.9B
| $44.1M | 0.03% |
136,000
-11,600
| -8% | -$3.9M |
|
335
CALL
McKesson
MCK
$95.3B
| $43.5M | 0.03% |
87,900
+13,600
| +18% | +$7.57M |
|
336
PUT
Boston Scientific
BSX
$63.9B
| $43.5M | 0.03% |
518,500
-93,200
| -15% | -$7.35M |
|
337
PUT
Live Nation Entertainment
LYV
$41.4B
| $43.4M | 0.03% |
396,100
-13,000
| -3% | -$1.26M |
|
|
338
CALL
CAVA Group
CAVA
$7.26B
| $43.4M | 0.03% |
350,100
+46,700
| +15% | +$4.75M |
|
339
PUT
Merck
MRK
$315B
| $43.2M | 0.03% |
380,500
+21,900
| +6% | +$2.6M |
|
340
PUT
Western Digital
WDC
$192B
| $43.1M | 0.03% |
835,607
-119,996
| -13% | -$6.06M |
|
341
CALL
ConocoPhillips
COP
$145B
| $43.1M | 0.03% |
409,100
+124,900
| +44% | +$13.7M |
|
342
CALL
Halliburton
HAL
$27.6B
| $42.9M | 0.03% |
1,520,000
+1,104,600
| +266% | +$34.8M |
|
|
B
343
PUT
Barrick Mining
B
$62.8B
| $42.9M | 0.03% |
2,158,300
-1,088,600
| -34% | -$20.7M |
|
344
CALL
Autodesk
ADSK
$43B
| $42.8M | 0.03% |
155,200
+45,800
| +42% | +$11.5M |
|
345
PUT
Deere & Co
DE
$164B
| $42.7M | 0.03% |
102,300
-13,800
| -12% | -$5.2M |
|
|
346
Microsoft
MSFT
$2.9T
| $42.5M | 0.02% |
+98,740
| New | +$42.2M |
|
347
PUT
Enphase Energy
ENPH
$5.22B
| $42.5M | 0.02% |
375,700
-26,600
| -7% | -$2.97M |
|
348
PUT
Analog Devices
ADI
$188B
| $42.1M | 0.02% |
182,800
-49,100
| -21% | -$11.1M |
|
349
PUT
Albemarle
ALB
$13.9B
| $42M | 0.02% |
443,300
+91,600
| +26% | +$8.13M |
|
350
PUT
Affirm
AFRM
$24.8B
| $41.9M | 0.02% |
1,026,000
+32,900
| +3% | +$1.09M |
|
Similar funds
Simplex Trading's Q3 2024 Portfolio in Review
As of Q3 2024, Simplex Trading held 9,964 positions worth $170B, up 5.3% from $162B the previous quarter. Its ten largest holdings account for 50% of the portfolio.
Simplex Trading's Q3 2024 filing shows 1,185 new, 3,232 increased, 3,829 reduced and 1,476 closed positions. Its largest new stake was Boeing: 325,328 shares worth $49.5M. The largest sale was Broadcom, an estimated $95.2M.
By sector, the portfolio is most concentrated in Technology at 0.4% of assets, down from 0.53% a quarter earlier, followed by Consumer Discretionary and Healthcare.
- Simplex Trading's largest Q3 2024 buy was Boeing: 325,328 shares worth $49.5M.
- Simplex Trading added most to Pinduoduo in Q3 2024, an estimated $41.3M increase.
- Simplex Trading's biggest Q3 2024 reduction was Citigroup, cutting an estimated $57.2M.
- Simplex Trading fully exited Broadcom in Q3 2024, selling an estimated $95.2M.
- Simplex Trading's ten largest holdings make up 50% of its $170B portfolio in Q3 2024.
- Simplex Trading opened 1,185 new positions and closed 1,476 in Q3 2024.
- Simplex Trading's portfolio value rose 5.3% quarter-over-quarter to $170B.
Based on Simplex Trading's 13F filing for Q3 2024, filed 8 Nov 2024.