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 |
Alibaba
BABA
|
+$120M |
| 2 |
Alphabet (Google) Class A
GOOGL
|
+$93.9M |
| 3 |
Walt Disney
DIS
|
+$71.7M |
| 4 |
KraneShares CSI China Internet ETF
KWEB
|
+$41.7M |
| 5 |
Citigroup
C
|
+$39.4M |
Top Sells
| Rank | Stock | Value |
|---|---|---|
| 1 |
iShares 20+ Year Treasury Bond ETF
TLT
|
+$136M |
| 2 |
Amazon
AMZN
|
+$118M |
| 3 |
SPDR Gold Trust
GLD
|
+$56.2M |
| 4 |
Microsoft
MSFT
|
+$52.4M |
| 5 |
State Street SPDR Dow Jones Industrial Average ETF Trust
DIA
|
+$45.6M |
Sector Composition
| Rank | Sector | Weight |
|---|---|---|
| 1 | Technology | 0.33% |
| 2 | Consumer Discretionary | 0.3% |
| 3 | Communication Services | 0.21% |
| 4 | Financials | 0.19% |
| 5 | Healthcare | 0.19% |
| Name | Market Value | Portfolio Weight | Shares or Principal |
Change in Stake | Capital Flow | |
|---|---|---|---|---|---|---|
1
PUT
State Street SPDR S&P 500 ETF Trust
SPY
$787B
| $23.9B | 15.3% |
50,775,700
+6,342,500
| +14% | +$2.83B |
|
|
2
CALL
State Street SPDR S&P 500 ETF Trust
SPY
$787B
| $8.39B | 5.36% |
18,057,200
-3,166,600
| -15% | -$1.41B |
|
3
PUT
Invesco QQQ Trust
QQQ
$471B
| $6.65B | 4.25% |
16,236,300
-2,803,700
| -15% | -$1.06B |
|
4
PUT
iShares S&P 100 ETF
OEF
$20.2B
| $6.56B | 4.19% |
44,857,900
+12,349,300
| +38% | +$2.6B |
|
|
5
CALL
iShares S&P 100 ETF
OEF
$20.2B
| $4.98B | 3.19% |
36,585,300
+11,697,800
| +47% | +$2.46B |
|
6
CALL
NVIDIA
NVDA
$5.02T
| $3.63B | 2.32% |
75,988,000
+20,982,000
| +38% | +$972M |
|
|
7
CALL
Invesco QQQ Trust
QQQ
$471B
| $3.47B | 2.22% |
8,461,600
-503,500
| -6% | -$191M |
|
8
PUT
Tesla
TSLA
$1.42T
| $3.28B | 2.1% |
13,859,900
+682,800
| +5% | +$162M |
|
|
9
CALL
Tesla
TSLA
$1.42T
| $2.8B | 1.79% |
11,253,700
-336,600
| -3% | -$80M |
|
10
CALL
Apple
AAPL
$4.81T
| $2.45B | 1.56% |
12,701,700
-1,997,600
| -14% | -$369M |
|
|
11
PUT
NVIDIA
NVDA
$5.02T
| $2.37B | 1.52% |
47,922,000
-3,660,000
| -7% | -$170M |
|
|
12
CALL
Amazon
AMZN
$2.66T
| $1.82B | 1.16% |
12,148,000
+2,663,100
| +28% | +$373M |
|
|
13
PUT
Apple
AAPL
$4.81T
| $1.82B | 1.16% |
9,872,800
+220,700
| +2% | +$40.8M |
|
|
14
CALL
SPDR Gold Trust
GLD
$132B
| $1.67B | 1.07% |
8,722,200
+2,806,500
| +47% | +$514M |
|
15
CALL
Meta Platforms (Facebook)
META
$1.63T
| $1.64B | 1.05% |
4,640,600
-724,300
| -14% | -$236M |
|
16
PUT
State Street Materials Select Sector SPDR ETF
XLB
$8.31B
| $1.64B | 1.05% |
43,509,000
+4,705,400
| +12% | +$188M |
|
|
17
PUT
Microsoft
MSFT
$2.95T
| $1.54B | 0.98% |
4,108,000
+184,500
| +5% | +$65.7M |
|
|
18
CALL
Microsoft
MSFT
$2.95T
| $1.47B | 0.94% |
4,016,100
-821,800
| -17% | -$293M |
|
|
19
CALL
Alphabet (Google) Class A
GOOGL
$4.24T
| $1.41B | 0.9% |
10,120,500
+464,100
| +5% | +$62.4M |
|
|
20
PUT
Amazon
AMZN
$2.66T
| $1.24B | 0.79% |
8,174,900
+148,800
| +2% | +$20.9M |
|
21
PUT
Booking.com
BKNG
$139B
| $1.07B | 0.68% |
7,537,500
+3,547,500
| +89% | +$442M |
|
|
22
CALL
State Street Materials Select Sector SPDR ETF
XLB
$8.31B
| $975M | 0.62% |
25,817,600
+795,400
| +3% | +$31.8M |
|
|
23
PUT
Meta Platforms (Facebook)
META
$1.63T
| $943M | 0.6% |
3,013,300
-618,500
| -17% | -$201M |
|
|
24
PUT
Alphabet (Google) Class A
GOOGL
$4.24T
| $905M | 0.58% |
6,909,800
-501,100
| -7% | -$67.3M |
|
|
25
PUT
SPDR Gold Trust
GLD
$132B
| $802M | 0.51% |
4,197,400
+677,200
| +19% | +$124M |
|
Similar funds
Simplex Trading's Q4 2023 Portfolio in Review
As of Q4 2023, Simplex Trading held 10,333 positions worth $156B, up 23% from $127B the previous quarter. Its ten largest holdings account for 42% of the portfolio.
Simplex Trading deployed $15.1B of net new capital in Q4 2023, opening 1,639 new positions and adding to 3,920 existing holdings. Its largest new stake was Walt Disney: 812,984 shares worth $73.4M.
By sector, the portfolio is most concentrated in Technology at 0.33% of assets, down from 0.44% a quarter earlier, followed by Consumer Discretionary and Communication Services.
On the sell side, the largest reduction was iShares 20+ Year Treasury Bond ETF, an estimated $136M trimmed.
- Simplex Trading's largest Q4 2023 buy was Walt Disney: 812,984 shares worth $73.4M.
- Simplex Trading added most to Alibaba in Q4 2023, an estimated $120M increase.
- Simplex Trading's biggest Q4 2023 reduction was iShares 20+ Year Treasury Bond ETF, cutting an estimated $136M.
- Simplex Trading fully exited Amazon in Q4 2023, selling an estimated $118M.
- Simplex Trading's ten largest holdings make up 42% of its $156B portfolio in Q4 2023.
- Simplex Trading opened 1,639 new positions and closed 1,508 in Q4 2023.
- Simplex Trading's portfolio value rose 23% quarter-over-quarter to $156B.
Based on Simplex Trading's 13F filing for Q4 2023, filed 2 Feb 2024.