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 |
Pfizer
PFE
|
+$89.5M |
| 2 |
State Street Energy Select Sector SPDR ETF
XLE
|
+$85.5M |
| 3 |
Boeing
BA
|
+$71M |
| 4 |
Intel
INTC
|
+$60.7M |
| 5 |
Meta Platforms (Facebook)
META
|
+$48.3M |
Top Sells
| Rank | Stock | Value |
|---|---|---|
| 1 |
NVIDIA
NVDA
|
+$117M |
| 2 |
Alphabet (Google) Class A
GOOGL
|
+$104M |
| 3 |
Alibaba
BABA
|
+$82.8M |
| 4 |
Walt Disney
DIS
|
+$68.5M |
| 5 |
Citigroup
C
|
+$59.8M |
Sector Composition
| Rank | Sector | Weight |
|---|---|---|
| 1 | Technology | 0.38% |
| 2 | Healthcare | 0.27% |
| 3 | Consumer Discretionary | 0.25% |
| 4 | Industrials | 0.17% |
| 5 | Communication Services | 0.16% |
| Name | Market Value | Portfolio Weight | Shares or Principal |
Change in Stake | Capital Flow | |
|---|---|---|---|---|---|---|
26
PUT
Advanced Micro Devices
AMD
$888B
| $804M | 0.46% |
4,453,700
+221,300
| +5% | +$38.7M |
|
27
CALL
Broadcom
AVGO
$1.84T
| $788M | 0.45% |
5,942,000
+2,078,000
| +54% | +$257M |
|
28
PUT
State Street SPDR NYSE Technology ETF
XNTK
$2.16B
| $736M | 0.42% |
11,537,700
+681,800
| +6% | +$119M |
|
29
CALL
Strategy Inc
MSTR
$37B
| $725M | 0.42% |
4,253,000
+2,046,000
| +93% | +$187M |
|
|
30
CALL
Advanced Micro Devices
AMD
$888B
| $705M | 0.41% |
3,908,700
-113,100
| -3% | -$19.8M |
|
31
PUT
Super Micro Computer
SMCI
$16.5B
| $678M | 0.39% |
6,715,000
+3,025,000
| +82% | +$222M |
|
|
32
CALL
Alibaba
BABA
$283B
| $649M | 0.38% |
8,975,700
+182,700
| +2% | +$13.4M |
|
33
CALL
VanEck Gold Miners ETF
GDX
$22.7B
| $642M | 0.37% |
9,174,500
+2,267,400
| +33% | +$64.4M |
|
|
34
PUT
VanEck Gold Miners ETF
GDX
$22.7B
| $639M | 0.37% |
5,198,700
+1,198,600
| +30% | +$34.1M |
|
|
35
PUT
Broadcom
AVGO
$1.84T
| $615M | 0.36% |
4,642,000
-2,233,000
| -32% | -$277M |
|
36
PUT
Netflix
NFLX
$286B
| $597M | 0.34% |
9,824,000
-5,698,000
| -37% | -$321M |
|
37
CALL
TSMC
TSM
$2.2T
| $555M | 0.32% |
4,081,500
+1,613,400
| +65% | +$200M |
|
|
38
PUT
Strategy Inc
MSTR
$37B
| $547M | 0.32% |
3,211,000
+15,000
| +0.5% | +$1.37M |
|
39
PUT
Costco
COST
$412B
| $544M | 0.31% |
742,300
+77,200
| +12% | +$55.1M |
|
40
CALL
Micron Technology
MU
$1.1T
| $493M | 0.28% |
4,183,600
+2,047,600
| +96% | +$185M |
|
|
41
CALL
State Street SPDR NYSE Technology ETF
XNTK
$2.16B
| $474M | 0.27% |
6,975,500
-2,995,400
| -30% | -$524M |
|
42
PUT
iShares Morningstar Value ETF
ILCV
$1.3B
| $466M | 0.27% |
5,661,800
+122,800
| +2% | +$8.94M |
|
|
43
CALL
Costco
COST
$412B
| $455M | 0.26% |
621,700
+152,200
| +32% | +$109M |
|
|
44
CALL
Netflix
NFLX
$286B
| $451M | 0.26% |
7,429,000
-6,138,000
| -45% | -$346M |
|
|
45
CALL
Super Micro Computer
SMCI
$16.5B
| $435M | 0.25% |
4,308,000
+966,000
| +29% | +$70.8M |
|
|
46
CALL
Boeing
BA
$161B
| $418M | 0.24% |
2,166,900
+487,900
| +29% | +$100M |
|
47
CALL
Eli Lilly
LLY
$1.05T
| $381M | 0.22% |
490,000
+29,800
| +6% | +$21.2M |
|
48
PUT
State Street SPDR Dow Jones Industrial Average ETF Trust
DIA
$46B
| $381M | 0.22% |
957,100
-515,000
| -35% | -$198M |
|
49
PUT
Coinbase
COIN
$46.3B
| $381M | 0.22% |
1,435,700
-1,179,400
| -45% | -$212M |
|
|
50
PUT
Micron Technology
MU
$1.1T
| $380M | 0.22% |
3,222,000
-22,300
| -0.7% | -$2.02M |
|
Similar funds
Simplex Trading's Q1 2024 Portfolio in Review
As of Q1 2024, Simplex Trading held 10,366 positions worth $173B, up 11% from $156B the previous quarter. Its ten largest holdings account for 47% of the portfolio.
Simplex Trading's Q1 2024 filing shows 1,549 new, 3,675 increased, 3,484 reduced and 1,506 closed positions. Its largest new stake was Boeing: 345,653 shares worth $66.7M. The largest sale was NVIDIA, an estimated $117M.
By sector, the portfolio is most concentrated in Technology at 0.38% of assets, up from 0.33% a quarter earlier, followed by Healthcare and Consumer Discretionary.
- Simplex Trading's largest Q1 2024 buy was Boeing: 345,653 shares worth $66.7M.
- Simplex Trading added most to Pfizer in Q1 2024, an estimated $89.5M increase.
- Simplex Trading's biggest Q1 2024 reduction was NVIDIA, cutting an estimated $117M.
- Simplex Trading fully exited Citigroup in Q1 2024, selling an estimated $59.8M.
- Simplex Trading's ten largest holdings make up 47% of its $173B portfolio in Q1 2024.
- Simplex Trading opened 1,549 new positions and closed 1,506 in Q1 2024.
- Simplex Trading's portfolio value rose 11% quarter-over-quarter to $173B.
Based on Simplex Trading's 13F filing for Q1 2024, filed 25 Apr 2024.