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 | |
|---|---|---|---|---|---|---|
2701
CALL
AES
AES
$10.6B
| $482K | ﹤0.01% |
267
+214
| +404% | +$3.6K |
|
2702
KBR
KBR
$4.68B
| $482K | ﹤0.01% |
+25,273
| New | +$456K |
|
|
OAK
2703
PUT
DELISTED
OAKTREE CAPITAL GROUP, LLC
OAK
| $481K | ﹤0.01% |
97
-33
| -25% | -$1.43K |
|
|
CTLP
2704
PUT
DELISTED
Cantaloupe
CTLP
| $480K | ﹤0.01% |
1,158
+91
| +9% | +$408 |
|
|
LITS
2705
PUT
Lite Strategy Inc
LITS
$33.6M
| $480K | ﹤0.01% |
78
+38
| +95% | +$2.18K |
|
2706
PUT
Green Dot
GDOT
$753M
| $479K | ﹤0.01% |
79
+44
| +126% | +$3.07K |
|
2707
CALL
Ralph Lauren
RL
$22.2B
| $479K | ﹤0.01% |
37
-46
| -55% | -$5.48K |
|
2708
PUT
3D Systems Corp
DDD
$420M
| $478K | ﹤0.01% |
445
+294
| +195% | +$3.49K |
|
2709
iShares MSCI Saudi Arabia ETF
KSA
$647M
| $478K | ﹤0.01% |
+14,375
| New | +$456K |
|
2710
CALL
Tanger
SKT
$4.82B
| $478K | ﹤0.01% |
228
+32
| +16% | +$689 |
|
|
DFS
2711
PUT
DELISTED
Discover Financial Services
DFS
| $476K | ﹤0.01% |
67
-123
| -65% | -$8.42K |
|
2712
Madrigal Pharmaceuticals
MDGL
$12.6B
| $476K | ﹤0.01% |
3,802
-5
| -0.1% | -$622 |
|
2713
CALL
Rogers Corp
ROG
$2.33B
| $476K | ﹤0.01% |
30
+10
| +50% | +$1.35K |
|
|
SGEN
2714
CALL
DELISTED
Seagen Inc. Common Stock
SGEN
| $476K | ﹤0.01% |
65
+49
| +306% | +$3.49K |
|
2715
Blackstone
BX
$104B
| $475K | ﹤0.01% |
13,596
-35,986
| -73% | -$1.2M |
|
2716
CALL
Everest Group
EG
$15.2B
| $475K | ﹤0.01% |
22
+10
| +83% | +$2.18K |
|
2717
PUT
Ezcorp Inc
EZPW
$1.82B
| $475K | ﹤0.01% |
510
+464
| +1,009% | +$4.38K |
|
|
MDCO
2718
DELISTED
Medicines Co
MDCO
| $475K | ﹤0.01% |
+17,013
| New | +$401K |
|
|
SF
2719
CALL
Stifel
SF
$12.3B
| $474K | ﹤0.01% |
203
-74
| -27% | -$1.68K |
|
2720
Best Buy
BBY
$18B
| $472K | ﹤0.01% |
+6,645
| New | +$414K |
|
|
DPLO
2721
PUT
DELISTED
DIPLOMAT PHARMACY, INC.
DPLO
| $472K | ﹤0.01% |
814
+808
| +13,467% | +$8.34K |
|
2722
iShares US Home Construction ETF
ITB
$2.41B
| $471K | ﹤0.01% |
13,386
-57,225
| -81% | -$1.94M |
|
|
WCC
2723
CALL
WESCO International
WCC
$16.2B
| $471K | ﹤0.01% |
89
+57
| +178% | +$3.01K |
|
|
SC
2724
CALL
DELISTED
SANTANDER CONSUMER USA HOLDINGS INC
SC
| $471K | ﹤0.01% |
223
+108
| +94% | +$2.15K |
|
|
APHA
2725
CALL
DELISTED
Aphria Inc. Common Shares
APHA
| $471K | ﹤0.01% |
506
+6
| +1% | +$53 |
|
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.