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 | Miscellaneous | 98.49% |
| 2 | Technology | 0.4% |
| 3 | Consumer Discretionary | 0.29% |
| 4 | Healthcare | 0.15% |
| 5 | Industrials | 0.13% |
| 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
| $32.8B | 19.24% |
57,141,100
+4,546,600
| +9% | +$2.51B |
2015 Q1
38 quarters
|
|
|
2
CALL
State Street SPDR S&P 500 ETF Trust
SPY
$815B
| $14.7B | 8.65% |
25,697,100
+6,295,700
| +32% | +$3.48B |
2015 Q1
38 quarters
|
|
3
PUT
Invesco QQQ Trust
QQQ
$475B
| $7.12B | 4.18% |
14,583,900
-4,155,800
| -22% | -$1.97B |
2021 Q2
13 quarters
|
|
4
PUT
iShares S&P 100 ETF
OEF
$20.3B
| $6.69B | 3.92% |
43,171,000
+5,967,700
| +16% | +$1.59B |
2014 Q4
39 quarters
|
|
5
CALL
NVIDIA
NVDA
$5.13T
| $4.89B | 2.87% |
40,248,500
-10,844,000
| -21% | -$1.28B |
2021 Q2
13 quarters
|
|
|
6
PUT
NVIDIA
NVDA
$5.13T
| $4.87B | 2.86% |
40,115,900
-3,090,900
| -7% | -$365M |
2021 Q2
13 quarters
|
|
|
7
CALL
Invesco QQQ Trust
QQQ
$475B
| $4.68B | 2.75% |
9,592,800
-221,100
| -2% | -$105M |
2021 Q2
13 quarters
|
|
|
8
CALL
iShares S&P 100 ETF
OEF
$20.3B
| $4.3B | 2.52% |
35,776,600
+4,839,000
| +16% | +$1.29B |
2014 Q4
39 quarters
|
|
|
9
CALL
Apple
AAPL
$5.08T
| $2.87B | 1.69% |
12,327,200
-3,927,200
| -24% | -$877M |
2015 Q1
38 quarters
|
|
10
CALL
Tesla
TSLA
$1.48T
| $2.83B | 1.66% |
10,821,800
-366,700
| -3% | -$83.6M |
2021 Q2
13 quarters
|
|
|
11
PUT
Tesla
TSLA
$1.48T
| $2.23B | 1.31% |
9,265,800
-9,665,700
| -51% | -$2.2B |
2021 Q2
13 quarters
|
|
|
12
PUT
Apple
AAPL
$5.08T
| $1.95B | 1.15% |
8,452,000
-743,900
| -8% | -$166M |
2015 Q1
38 quarters
|
|
13
CALL
Meta Platforms (Facebook)
META
$1.65T
| $1.83B | 1.07% |
3,190,300
+304,900
| +11% | +$157M |
2014 Q4
39 quarters
|
|
14
PUT
State Street Materials Select Sector SPDR ETF
XLB
$8.18B
| $1.49B | 0.87% |
43,932,600
+5,969,200
| +16% | +$272M |
2015 Q1
38 quarters
|
|
15
CALL
SPDR Gold Trust
GLD
$136B
| $1.39B | 0.82% |
5,732,500
+44,500
| +0.8% | +$10.2M |
2015 Q1
38 quarters
|
|
|
16
CALL
Microsoft
MSFT
$3.87T
| $1.23B | 0.72% |
2,859,900
+26,000
| +0.9% | +$11.1M |
2014 Q4
39 quarters
|
|
|
17
PUT
Meta Platforms (Facebook)
META
$1.65T
| $1.22B | 0.72% |
2,237,000
+187,200
| +9% | +$96.3M |
2014 Q4
39 quarters
|
|
18
CALL
Alphabet (Google) Class A
GOOGL
$3.96T
| $1.22B | 0.72% |
7,594,900
+1,023,900
| +16% | +$172M |
2015 Q4
35 quarters
|
|
19
CALL
Amazon
AMZN
$2.7T
| $1.03B | 0.6% |
5,519,700
-1,117,300
| -17% | -$204M |
2015 Q1
38 quarters
|
|
|
20
PUT
SPDR Gold Trust
GLD
$136B
| $1.01B | 0.6% |
4,172,700
-262,300
| -6% | -$60.1M |
2015 Q1
38 quarters
|
|
|
21
PUT
Amazon
AMZN
$2.7T
| $979M | 0.57% |
5,255,200
-810,700
| -13% | -$148M |
2015 Q1
38 quarters
|
|
|
22
CALL
State Street Materials Select Sector SPDR ETF
XLB
$8.18B
| $979M | 0.57% |
23,728,200
-4,712,200
| -17% | -$215M |
2015 Q1
38 quarters
|
|
23
CALL
Alibaba
BABA
$253B
| $975M | 0.57% |
9,183,600
-309,500
| -3% | -$25.3M |
2021 Q2
13 quarters
|
|
|
24
PUT
Microsoft
MSFT
$3.87T
| $862M | 0.51% |
2,002,600
-725,000
| -27% | -$310M |
2014 Q4
39 quarters
|
|
|
25
PUT
Alphabet (Google) Class A
GOOGL
$3.96T
| $820M | 0.48% |
5,026,800
+52,500
| +1% | +$8.81M |
2015 Q4
35 quarters
|
|
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, 3,828 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 Miscellaneous at 98% of assets, up from 98% a quarter earlier, followed by Technology and Consumer Discretionary.
- 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.