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 |
iShares 20+ Year Treasury Bond ETF
TLT
|
+$272M |
| 2 |
Alphabet (Google) Class A
GOOGL
|
+$99M |
| 3 |
NVIDIA
NVDA
|
+$89.9M |
| 4 |
TSMC
TSM
|
+$87.7M |
| 5 |
Amazon
AMZN
|
+$61M |
Top Sells
| Rank | Stock | Value |
|---|---|---|
| 1 |
Apple
AAPL
|
+$518M |
| 2 |
Strategy Inc
MSTR
|
+$81.2M |
| 3 |
Alibaba
BABA
|
+$66.7M |
| 4 |
Advanced Micro Devices
AMD
|
+$44.3M |
| 5 |
Uber
UBER
|
+$41.3M |
Sector Composition
| Rank | Sector | Weight |
|---|---|---|
| 1 | Miscellaneous | 98.56% |
| 2 | Technology | 0.41% |
| 3 | Consumer Discretionary | 0.22% |
| 4 | Healthcare | 0.17% |
| 5 | Communication Services | 0.15% |
| Name | Market Value | Portfolio Weight | Shares or Principal |
Change in Stake | Capital Flow | Held Since | |
|---|---|---|---|---|---|---|---|
1
PUT
State Street SPDR S&P 500 ETF Trust
SPY
$815B
| $29.8B | 19.07% |
58,393,000
-997,700
| -2% | -$586M |
2015 Q1
40 quarters
|
|
|
2
CALL
State Street SPDR S&P 500 ETF Trust
SPY
$815B
| $13B | 8.32% |
23,233,000
+3,839,800
| +20% | +$2.26B |
2015 Q1
40 quarters
|
|
3
PUT
Invesco QQQ Trust
QQQ
$475B
| $7.31B | 4.68% |
15,588,600
+4,518,400
| +41% | +$2.3B |
2021 Q2
15 quarters
|
|
4
PUT
iShares S&P 100 ETF
OEF
$20.3B
| $7.17B | 4.59% |
48,357,800
+1,601,400
| +3% | +$460M |
2014 Q4
41 quarters
|
|
|
5
CALL
iShares S&P 100 ETF
OEF
$20.3B
| $3.99B | 2.55% |
36,206,900
+1,822,800
| +5% | +$523M |
2014 Q4
41 quarters
|
|
|
6
CALL
Invesco QQQ Trust
QQQ
$475B
| $3.92B | 2.51% |
8,548,600
+2,109,900
| +33% | +$1.07B |
2021 Q2
15 quarters
|
|
7
PUT
Tesla
TSLA
$1.48T
| $3.86B | 2.47% |
14,885,300
-392,600
| -3% | -$131M |
2021 Q2
15 quarters
|
|
|
8
CALL
Tesla
TSLA
$1.48T
| $3.74B | 2.4% |
14,434,600
-210,900
| -1% | -$70.3M |
2021 Q2
15 quarters
|
|
|
9
PUT
NVIDIA
NVDA
$5.12T
| $3.35B | 2.15% |
30,915,800
-3,941,200
| -11% | -$500M |
2021 Q2
15 quarters
|
|
|
10
CALL
NVIDIA
NVDA
$5.12T
| $2.86B | 1.83% |
27,248,600
-12,793,800
| -32% | -$1.62B |
2021 Q2
15 quarters
|
|
11
CALL
Meta Platforms (Facebook)
META
$1.65T
| $2.25B | 1.44% |
3,902,700
+689,100
| +21% | +$445M |
2014 Q4
41 quarters
|
|
|
12
CALL
Apple
AAPL
$5.08T
| $2.06B | 1.32% |
9,263,700
-5,023,000
| -35% | -$1.16B |
2015 Q1
40 quarters
|
|
|
13
PUT
Apple
AAPL
$5.08T
| $1.78B | 1.14% |
7,997,000
-5,643,100
| -41% | -$1.31B |
2015 Q1
40 quarters
|
|
14
CALL
SPDR Gold Trust
GLD
$136B
| $1.65B | 1.06% |
5,729,200
+361,600
| +7% | +$95.6M |
2015 Q1
40 quarters
|
|
|
15
PUT
Meta Platforms (Facebook)
META
$1.65T
| $1.51B | 0.97% |
2,652,800
+392,900
| +17% | +$253M |
2014 Q4
41 quarters
|
|
16
PUT
State Street Materials Select Sector SPDR ETF
XLB
$8.18B
| $1.41B | 0.9% |
36,046,600
-1,812,000
| -5% | -$79.2M |
2015 Q1
40 quarters
|
|
|
17
CALL
Amazon
AMZN
$2.7T
| $1.35B | 0.87% |
7,114,200
+1,675,600
| +31% | +$364M |
2015 Q1
40 quarters
|
|
|
18
PUT
SPDR Gold Trust
GLD
$136B
| $1.26B | 0.8% |
4,362,900
+874,500
| +25% | +$231M |
2015 Q1
40 quarters
|
|
19
CALL
Microsoft
MSFT
$3.87T
| $1.16B | 0.74% |
3,083,100
-347,100
| -10% | -$142M |
2014 Q4
41 quarters
|
|
|
20
PUT
Strategy Inc
MSTR
$61.7B
| $1.13B | 0.73% |
4,063,600
-422,200
| -9% | -$134M |
2020 Q4
17 quarters
|
|
|
21
PUT
Amazon
AMZN
$2.7T
| $1.01B | 0.65% |
5,310,200
-189,000
| -3% | -$41M |
2015 Q1
40 quarters
|
|
|
22
CALL
Alphabet (Google) Class A
GOOGL
$3.97T
| $953M | 0.61% |
6,220,200
-579,700
| -9% | -$105M |
2015 Q4
37 quarters
|
|
|
23
CALL
Strategy Inc
MSTR
$61.7B
| $903M | 0.58% |
3,131,900
-599,800
| -16% | -$190M |
2020 Q4
17 quarters
|
|
|
24
CALL
State Street Materials Select Sector SPDR ETF
XLB
$8.18B
| $852M | 0.55% |
22,822,600
-6,660,800
| -23% | -$291M |
2015 Q1
40 quarters
|
|
|
25
PUT
Microsoft
MSFT
$3.87T
| $830M | 0.53% |
2,211,500
-532,400
| -19% | -$217M |
2014 Q4
41 quarters
|
|
Similar funds
Simplex Trading's Q1 2025 Portfolio in Review
As of Q1 2025, Simplex Trading held 10,070 positions worth $156B, down 13% from $179B the previous quarter. Its ten largest holdings account for 51% of the portfolio.
Simplex Trading's Q1 2025 filing shows 1,566 new, 3,139 increased, 3,654 reduced and 1,547 closed positions. Its largest new stake was iShares 20+ Year Treasury Bond ETF: 3,057,978 shares worth $278M. The largest sale was Apple, an estimated $518M.
By sector, the portfolio is most concentrated in Miscellaneous at 99% of assets, up from 98% a quarter earlier, followed by Technology and Consumer Discretionary.
- Simplex Trading's largest Q1 2025 buy was iShares 20+ Year Treasury Bond ETF: 3,057,978 shares worth $278M.
- Simplex Trading added most to NVIDIA in Q1 2025, an estimated $89.9M increase.
- Simplex Trading's biggest Q1 2025 reduction was Apple, cutting an estimated $518M.
- Simplex Trading fully exited Alibaba in Q1 2025, selling an estimated $66.7M.
- Simplex Trading's ten largest holdings make up 51% of its $156B portfolio in Q1 2025.
- Simplex Trading opened 1,566 new positions and closed 1,547 in Q1 2025.
- Simplex Trading's portfolio value fell 13% quarter-over-quarter to $156B.
Based on Simplex Trading's 13F filing for Q1 2025, filed 12 May 2025.