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 |
Apple
AAPL
|
+$70.1M |
| 2 |
iShares 20+ Year Treasury Bond ETF
TLT
|
+$46.6M |
| 3 |
Alphabet (Google) Class C
GOOG
|
+$37.4M |
| 4 |
Amazon
AMZN
|
+$37M |
| 5 |
Tesla
TSLA
|
+$28M |
Top Sells
| Rank | Stock | Value |
|---|---|---|
| 1 |
Alibaba
BABA
|
+$41M |
| 2 |
Boeing
BA
|
+$27.8M |
| 3 |
Biogen
BIIB
|
+$18.9M |
| 4 |
SPDR Gold Trust
GLD
|
+$18.3M |
| 5 |
State Street SPDR Dow Jones Industrial Average ETF Trust
DIA
|
+$13.6M |
Sector Composition
| Rank | Sector | Weight |
|---|---|---|
| 1 | Technology | 0.75% |
| 2 | Consumer Discretionary | 0.58% |
| 3 | Communication Services | 0.33% |
| 4 | Healthcare | 0.31% |
| 5 | Industrials | 0.19% |
| Name | Market Value | Portfolio Weight | Shares or Principal |
Change in Stake | Capital Flow | |
|---|---|---|---|---|---|---|
26
PUT
NVIDIA
NVDA
$5.02T
| $238M | 0.52% |
404,160
+120,480
| +42% | +$627K |
|
27
CALL
Microsoft
MSFT
$2.95T
| $230M | 0.5% |
14,612
+5,701
| +64% | +$838K |
|
28
CALL
Walt Disney
DIS
$167B
| $227M | 0.5% |
15,732
+6,985
| +80% | +$975K |
|
29
PUT
Booking.com
BKNG
$139B
| $226M | 0.49% |
27,475
+5,475
| +25% | +$430K |
|
|
30
CALL
NVIDIA
NVDA
$5.02T
| $222M | 0.48% |
376,560
+73,720
| +24% | +$383K |
|
|
31
CALL
State Street SPDR Dow Jones Industrial Average ETF Trust
DIA
$46B
| $205M | 0.45% |
7,174
-578
| -7% | -$159K |
|
32
PUT
iShares Morningstar Value ETF
ILCV
$1.3B
| $198M | 0.43% |
45,436
-824
| -2% | -$46.8K |
|
|
33
PUT
Walt Disney
DIS
$167B
| $196M | 0.43% |
13,562
+7,241
| +115% | +$1.01M |
|
34
PUT
Meta Platforms (Facebook)
META
$1.63T
| $193M | 0.42% |
9,396
+95
| +1% | +$18.4K |
|
35
PUT
VanEck Gold Miners ETF
GDX
$22.7B
| $179M | 0.39% |
31,166
-7,999
| -20% | -$219K |
|
36
PUT
Shopify
SHOP
$160B
| $177M | 0.39% |
44,580
+9,950
| +29% | +$337K |
|
37
PUT
State Street SPDR NYSE Technology ETF
XNTK
$2.16B
| $177M | 0.39% |
36,367
+3,275
| +10% | +$251K |
|
|
38
PUT
Boeing
BA
$161B
| $167M | 0.37% |
5,135
-522
| -9% | -$185K |
|
|
39
CALL
Booking.com
BKNG
$139B
| $162M | 0.35% |
19,700
+7,875
| +67% | +$618K |
|
|
40
PUT
Microsoft
MSFT
$2.95T
| $155M | 0.34% |
9,832
-1,257
| -11% | -$185K |
|
41
PUT
Berkshire Hathaway Class B
BRK.B
$1.06T
| $145M | 0.32% |
6,398
+1,935
| +43% | +$420K |
|
|
42
PUT
SPDR Gold Trust
GLD
$132B
| $137M | 0.3% |
9,578
-5,576
| -37% | -$779K |
|
|
43
CALL
VanEck Gold Miners ETF
GDX
$22.7B
| $133M | 0.29% |
33,522
-17,964
| -35% | -$491K |
|
44
PUT
Visa
V
$677B
| $129M | 0.28% |
6,862
-1,789
| -21% | -$322K |
|
45
PUT
Mastercard
MA
$476B
| $128M | 0.28% |
4,282
+1,581
| +59% | +$446K |
|
46
PUT
Adobe
ADBE
$90.3B
| $120M | 0.26% |
3,625
-454
| -11% | -$134K |
|
47
PUT
Intuitive Surgical
ISRG
$124B
| $103M | 0.23% |
5,244
+1,566
| +43% | +$293K |
|
48
CALL
JPMorgan Chase
JPM
$918B
| $100M | 0.22% |
8,344
+1,473
| +21% | +$189K |
|
49
PUT
Home Depot
HD
$332B
| $99.1M | 0.22% |
4,536
-510
| -10% | -$116K |
|
50
PUT
iShares MSCI Australia ETF
EWA
$1.34B
| $98.3M | 0.21% |
22,175
+244
| +1% | +$5.49K |
|
Similar funds
Simplex Trading's Q4 2019 Portfolio in Review
As of Q4 2019, Simplex Trading held 8,523 positions worth $45.7B, up 30% from $35.2B the previous quarter. Its ten largest holdings account for 39% of the portfolio.
Simplex Trading's Q4 2019 filing shows 1,277 new, 3,072 increased, 2,710 reduced and 1,251 closed positions. Its largest new stake was Apple: 1,090,316 shares worth $80M. The largest sale was Alibaba, an estimated $41M.
By sector, the portfolio is most concentrated in Technology at 0.75% of assets, up from 0.48% a quarter earlier, followed by Consumer Discretionary and Communication Services.
- Simplex Trading's largest Q4 2019 buy was Apple: 1,090,316 shares worth $80M.
- Simplex Trading added most to iShares 20+ Year Treasury Bond ETF in Q4 2019, an estimated $46.6M increase.
- Simplex Trading's biggest Q4 2019 reduction was Alibaba, cutting an estimated $41M.
- Simplex Trading fully exited Boeing in Q4 2019, selling an estimated $27.8M.
- Simplex Trading's ten largest holdings make up 39% of its $45.7B portfolio in Q4 2019.
- Simplex Trading opened 1,277 new positions and closed 1,251 in Q4 2019.
- Simplex Trading's portfolio value rose 30% quarter-over-quarter to $45.7B.
Based on Simplex Trading's 13F filing for Q4 2019, filed 5 Feb 2020.