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 |
Invesco QQQ Trust
QQQ
|
+$86.9M |
| 2 |
Walt Disney
DIS
|
+$25.5M |
| 3 |
Baidu
BIDU
|
+$12.3M |
| 4 |
Alphabet (Google) Class A
GOOGL
|
+$12.3M |
| 5 |
RHT
Red Hat Inc
RHT
|
+$11.4M |
Top Sells
| Rank | Stock | Value |
|---|---|---|
| 1 |
Amazon
AMZN
|
+$66M |
| 2 |
iShares Russell 2000 ETF
IWM
|
+$60.3M |
| 3 |
Alphabet (Google) Class C
GOOG
|
+$33.9M |
| 4 |
Apple
AAPL
|
+$21.1M |
| 5 |
State Street Financial Select Sector SPDR ETF
XLF
|
+$18.2M |
Sector Composition
| Rank | Sector | Weight |
|---|---|---|
| 1 | Communication Services | 0.58% |
| 2 | Technology | 0.42% |
| 3 | Healthcare | 0.34% |
| 4 | Consumer Discretionary | 0.29% |
| 5 | Industrials | 0.21% |
| Name | Market Value | Portfolio Weight | Shares or Principal |
Change in Stake | Capital Flow | |
|---|---|---|---|---|---|---|
|
XLNX
51
PUT
DELISTED
Xilinx Inc
XLNX
| $89.5M | 0.25% |
7,060
+6,124
| +654% | +$688K |
|
52
PUT
Goldman Sachs
GS
$323B
| $88.3M | 0.25% |
4,598
+934
| +25% | +$180K |
|
53
PUT
Booking.com
BKNG
$139B
| $87.9M | 0.24% |
12,600
-9,125
| -42% | -$651K |
|
54
PUT
Procter & Gamble
PG
$350B
| $86.7M | 0.24% |
8,332
+5,410
| +185% | +$527K |
|
55
CALL
Salesforce
CRM
$135B
| $79.6M | 0.22% |
5,029
-1,402
| -22% | -$217K |
|
|
56
PUT
Salesforce
CRM
$135B
| $77.4M | 0.22% |
4,886
+287
| +6% | +$44.5K |
|
|
57
CALL
Goldman Sachs
GS
$323B
| $75.2M | 0.21% |
3,919
-1,183
| -23% | -$228K |
|
|
58
PUT
Baidu
BIDU
$36.7B
| $73M | 0.2% |
4,431
+1,919
| +76% | +$321K |
|
59
PUT
Broadcom
AVGO
$1.86T
| $72.2M | 0.2% |
24,020
-150
| -0.6% | -$4.07K |
|
60
PUT
Bristol-Myers Squibb
BMY
$125B
| $69.6M | 0.19% |
14,589
+11,694
| +404% | +$583K |
|
|
61
CALL
Broadcom
AVGO
$1.86T
| $69M | 0.19% |
22,960
-10,280
| -31% | -$279K |
|
62
PUT
IBM
IBM
$197B
| $68.4M | 0.19% |
5,068
+602
| +13% | +$76.7K |
|
63
CALL
PayPal
PYPL
$49.1B
| $67.6M | 0.19% |
6,506
-260
| -4% | -$24.6K |
|
64
PUT
Qualcomm
QCOM
$187B
| $66.8M | 0.19% |
11,716
+6,609
| +129% | +$357K |
|
65
PUT
Merck
MRK
$316B
| $66.8M | 0.19% |
8,413
+3,505
| +71% | +$262K |
|
|
CELG
66
PUT
DELISTED
Celgene Corp
CELG
| $66.7M | 0.19% |
7,071
+2,642
| +60% | +$231K |
|
67
PUT
Union Pacific
UNP
$174B
| $66.3M | 0.18% |
3,968
+1,894
| +91% | +$305K |
|
68
PUT
Berkshire Hathaway Class B
BRK.B
$1.05T
| $65.5M | 0.18% |
3,262
-1,998
| -38% | -$403K |
|
|
69
CALL
IBM
IBM
$197B
| $64.3M | 0.18% |
4,769
-1,402
| -23% | -$179K |
|
|
70
CALL
Union Pacific
UNP
$174B
| $62.7M | 0.17% |
3,748
+1,759
| +88% | +$283K |
|
71
PUT
Citigroup
C
$224B
| $62.2M | 0.17% |
9,994
+1,632
| +20% | +$101K |
|
72
CALL
McDonald's
MCD
$188B
| $62.2M | 0.17% |
3,274
+1,429
| +77% | +$259K |
|
|
73
CALL
Citigroup
C
$224B
| $61.6M | 0.17% |
9,897
-3,640
| -27% | -$226K |
|
74
PUT
Amgen
AMGN
$199B
| $60.6M | 0.17% |
3,189
+976
| +44% | +$186K |
|
75
CALL
Chipotle Mexican Grill
CMG
$42.2B
| $60.3M | 0.17% |
42,450
+7,500
| +21% | +$87K |
|
Similar funds
Simplex Trading's Q1 2019 Portfolio in Review
As of Q1 2019, Simplex Trading held 8,479 positions worth $36B, up 5.5% from $34.1B the previous quarter. Its ten largest holdings account for 35% of the portfolio.
Simplex Trading's Q1 2019 filing shows 1,472 new, 3,049 increased, 2,419 reduced and 1,324 closed positions. Its largest new stake was Walt Disney: 228,471 shares worth $25.4M. The largest sale was Amazon, an estimated $66M.
By sector, the portfolio is most concentrated in Communication Services at 0.58% of assets, up from 0.49% a quarter earlier, followed by Technology and Healthcare.
- Simplex Trading's largest Q1 2019 buy was Walt Disney: 228,471 shares worth $25.4M.
- Simplex Trading added most to Invesco QQQ Trust in Q1 2019, an estimated $86.9M increase.
- Simplex Trading's biggest Q1 2019 reduction was iShares Russell 2000 ETF, cutting an estimated $60.3M.
- Simplex Trading fully exited Amazon in Q1 2019, selling an estimated $66M.
- Simplex Trading's ten largest holdings make up 35% of its $36B portfolio in Q1 2019.
- Simplex Trading opened 1,472 new positions and closed 1,324 in Q1 2019.
- Simplex Trading's portfolio value rose 5.5% quarter-over-quarter to $36B.
Based on Simplex Trading's 13F filing for Q1 2019, filed 18 Apr 2019.