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 | |
|---|---|---|---|---|---|---|
26
PUT
Advanced Micro Devices
AMD
$888B
| $767M | 0.45% |
4,674,200
+504,200
| +12% | +$76.6M |
|
27
CALL
Booking.com
BKNG
$139B
| $736M | 0.43% |
4,367,500
+3,707,500
| +562% | +$569M |
|
28
PUT
VanEck Gold Miners ETF
GDX
$22.7B
| $679M | 0.4% |
5,677,700
+324,000
| +6% | +$12.3M |
|
|
29
CALL
Broadcom
AVGO
$1.84T
| $628M | 0.37% |
3,638,000
-1,747,000
| -32% | -$280M |
|
|
30
CALL
VanEck Gold Miners ETF
GDX
$22.7B
| $618M | 0.36% |
7,616,900
-502,200
| -6% | -$19M |
|
|
31
CALL
Advanced Micro Devices
AMD
$888B
| $596M | 0.35% |
4,036,500
-194,000
| -5% | -$29.5M |
|
|
32
PUT
Broadcom
AVGO
$1.84T
| $590M | 0.35% |
3,420,100
-1,123,900
| -25% | -$180M |
|
33
PUT
Netflix
NFLX
$286B
| $572M | 0.34% |
8,959,000
+2,396,000
| +37% | +$160M |
|
34
PUT
State Street SPDR Dow Jones Industrial Average ETF Trust
DIA
$46B
| $547M | 0.32% |
1,293,600
+290,200
| +29% | +$118M |
|
35
CALL
Strategy Inc
MSTR
$37B
| $493M | 0.29% |
2,925,900
-390,100
| -12% | -$55.8M |
|
|
36
PUT
Booking.com
BKNG
$139B
| $481M | 0.28% |
2,852,500
+157,500
| +6% | +$24.2M |
|
|
37
PUT
TSMC
TSM
$2.2T
| $473M | 0.28% |
2,721,800
+173,600
| +7% | +$29.6M |
|
38
PUT
Alibaba
BABA
$283B
| $454M | 0.27% |
4,278,400
+1,103,700
| +35% | +$90.3M |
|
39
CALL
iShares Silver Trust
SLV
$28.4B
| $443M | 0.26% |
15,575,800
+1,586,800
| +11% | +$42.6M |
|
40
PUT
Costco
COST
$412B
| $419M | 0.25% |
472,900
-80,900
| -15% | -$70.2M |
|
41
PUT
State Street SPDR NYSE Technology ETF
XNTK
$2.16B
| $418M | 0.25% |
6,762,900
-904,000
| -12% | -$171M |
|
|
42
PUT
Strategy Inc
MSTR
$37B
| $410M | 0.24% |
2,630,000
-2,498,000
| -49% | -$357M |
|
43
CALL
Berkshire Hathaway Class B
BRK.B
$1.06T
| $398M | 0.23% |
865,500
+245,500
| +40% | +$109M |
|
|
44
PUT
Pinduoduo
PDD
$121B
| $359M | 0.21% |
2,661,800
+937,200
| +54% | +$115M |
|
45
CALL
ASML
ASML
$692B
| $351M | 0.21% |
421,200
+348,200
| +477% | +$311M |
|
46
CALL
Micron Technology
MU
$1.1T
| $351M | 0.21% |
3,382,800
+282,400
| +9% | +$29.5M |
|
|
47
CALL
Netflix
NFLX
$286B
| $346M | 0.2% |
4,880,000
+494,000
| +11% | +$33M |
|
48
CALL
Walmart Inc
WMT
$878B
| $343M | 0.2% |
4,248,800
+2,149,600
| +102% | +$158M |
|
|
49
CALL
Pinduoduo
PDD
$121B
| $342M | 0.2% |
2,536,500
+1,111,400
| +78% | +$137M |
|
|
50
CALL
State Street SPDR NYSE Technology ETF
XNTK
$2.16B
| $333M | 0.2% |
4,863,000
+191,500
| +4% | +$36.2M |
|
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.