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 |
NVIDIA
NVDA
|
+$29.6M |
| 2 |
State Street Industrial Select Sector SPDR ETF
XLI
|
+$22.6M |
| 3 |
iShares Russell 2000 ETF
IWM
|
+$17.9M |
| 4 |
Netflix
NFLX
|
+$17.1M |
| 5 |
iShares 20+ Year Treasury Bond ETF
TLT
|
+$13.4M |
Top Sells
| Rank | Stock | Value |
|---|---|---|
| 1 |
Invesco QQQ Trust
QQQ
|
+$123M |
| 2 |
State Street SPDR S&P 500 ETF Trust
SPY
|
+$40.6M |
| 3 |
Walt Disney
DIS
|
+$25.6M |
| 4 |
Alphabet (Google) Class A
GOOGL
|
+$13.5M |
| 5 |
Johnson & Johnson
JNJ
|
+$11.2M |
Sector Composition
| Rank | Sector | Weight |
|---|---|---|
| 1 | Technology | 0.5% |
| 2 | Communication Services | 0.5% |
| 3 | Healthcare | 0.35% |
| 4 | Industrials | 0.3% |
| 5 | Consumer Discretionary | 0.26% |
| Name | Market Value | Portfolio Weight | Shares or Principal |
Change in Stake | Capital Flow | |
|---|---|---|---|---|---|---|
|
26
CALL
Walt Disney
DIS
$167B
| $247M | 0.67% |
17,734
+6,390
| +56% | +$847K |
|
27
CALL
Boeing
BA
$161B
| $244M | 0.67% |
6,714
+869
| +15% | +$317K |
|
28
CALL
State Street Materials Select Sector SPDR ETF
XLB
$8.31B
| $244M | 0.67% |
74,000
-20,756
| -22% | -$586K |
|
29
PUT
VanEck Gold Miners ETF
GDX
$22.7B
| $203M | 0.55% |
37,008
+13,726
| +59% | +$302K |
|
|
30
PUT
Boeing
BA
$161B
| $200M | 0.55% |
5,504
-5,037
| -48% | -$1.84M |
|
31
PUT
State Street SPDR Dow Jones Industrial Average ETF Trust
DIA
$46B
| $200M | 0.55% |
7,534
+2,894
| +62% | +$755K |
|
32
PUT
iShares Morningstar Value ETF
ILCV
$1.3B
| $182M | 0.5% |
43,088
-3,858
| -8% | -$205K |
|
|
33
CALL
VanEck Gold Miners ETF
GDX
$22.7B
| $173M | 0.47% |
51,288
+17,788
| +53% | +$392K |
|
34
PUT
Mercado Libre
MELI
$92.4B
| $166M | 0.45% |
2,719
+1,753
| +181% | +$976K |
|
35
PUT
Microsoft
MSFT
$2.95T
| $164M | 0.45% |
12,245
-2,061
| -14% | -$262K |
|
36
CALL
Qualcomm
QCOM
$183B
| $156M | 0.42% |
20,447
+10,812
| +112% | +$792K |
|
|
37
CALL
Microsoft
MSFT
$2.95T
| $149M | 0.41% |
11,101
+579
| +6% | +$73.5K |
|
|
38
PUT
NVIDIA
NVDA
$5.02T
| $120M | 0.33% |
291,600
+84,520
| +41% | +$350K |
|
39
PUT
Booking.com
BKNG
$139B
| $119M | 0.33% |
15,900
+3,300
| +26% | +$237K |
|
|
40
PUT
Walt Disney
DIS
$167B
| $119M | 0.32% |
8,589
-6,206
| -42% | -$823K |
|
|
41
CALL
NVIDIA
NVDA
$5.02T
| $116M | 0.32% |
283,520
-45,360
| -14% | -$188K |
|
42
PUT
Salesforce
CRM
$139B
| $115M | 0.31% |
7,559
+2,673
| +55% | +$419K |
|
43
PUT
Berkshire Hathaway Class B
BRK.B
$1.06T
| $114M | 0.31% |
5,352
+2,090
| +64% | +$432K |
|
44
PUT
State Street SPDR NYSE Technology ETF
XNTK
$2.16B
| $107M | 0.29% |
23,242
-19,672
| -46% | -$1.42M |
|
|
45
CALL
Booking.com
BKNG
$139B
| $107M | 0.29% |
14,300
+7,600
| +113% | +$546K |
|
46
PUT
iShares MSCI Australia ETF
EWA
$1.34B
| $105M | 0.29% |
25,330
-12,740
| -33% | -$279K |
|
|
47
CALL
iShares MSCI Australia ETF
EWA
$1.34B
| $103M | 0.28% |
24,009
-1,409
| -6% | -$30.9K |
|
48
PUT
Adobe
ADBE
$90.3B
| $98M | 0.27% |
3,325
-814
| -20% | -$226K |
|
|
49
PUT
Qualcomm
QCOM
$183B
| $93.4M | 0.25% |
12,274
+558
| +5% | +$40.9K |
|
|
50
CALL
State Street SPDR NYSE Technology ETF
XNTK
$2.16B
| $91.3M | 0.25% |
21,492
-1,106
| -5% | -$79.9K |
|
Similar funds
Simplex Trading's Q2 2019 Portfolio in Review
As of Q2 2019, Simplex Trading held 8,406 positions worth $36.6B, up 1.9% from $36B the previous quarter. Its ten largest holdings account for 35% of the portfolio.
Simplex Trading's Q2 2019 filing shows 1,261 new, 2,604 increased, 3,015 reduced and 1,301 closed positions. Its largest new stake was iShares 20+ Year Treasury Bond ETF: 105,724 shares worth $14M. The largest sale was Invesco QQQ Trust, an estimated $123M.
By sector, the portfolio is most concentrated in Technology at 0.5% of assets, up from 0.42% a quarter earlier, followed by Communication Services and Healthcare.
- Simplex Trading's largest Q2 2019 buy was iShares 20+ Year Treasury Bond ETF: 105,724 shares worth $14M.
- Simplex Trading added most to NVIDIA in Q2 2019, an estimated $29.6M increase.
- Simplex Trading's biggest Q2 2019 reduction was State Street SPDR S&P 500 ETF Trust, cutting an estimated $40.6M.
- Simplex Trading fully exited Invesco QQQ Trust in Q2 2019, selling an estimated $123M.
- Simplex Trading's ten largest holdings make up 35% of its $36.6B portfolio in Q2 2019.
- Simplex Trading opened 1,261 new positions and closed 1,301 in Q2 2019.
- Simplex Trading's portfolio value rose 1.9% quarter-over-quarter to $36.6B.
Based on Simplex Trading's 13F filing for Q2 2019, filed 26 Jul 2019.