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 | |
|---|---|---|---|---|---|---|
1551
CALL
KKR & Co
KKR
$89.2B
| $1.64M | ﹤0.01% |
700
-1,376
| -66% | -$31.3K |
|
|
WWE
1552
DELISTED
World Wrestling Entertainment
WWE
| $1.64M | ﹤0.01% |
+18,928
| New | +$1.59M |
|
1553
PUT
Webster Financial
WBS
$12.3B
| $1.64M | ﹤0.01% |
324
-160
| -33% | -$8.67K |
|
1554
Guidewire Software
GWRE
$11.5B
| $1.64M | ﹤0.01% |
+16,847
| New | +$1.51M |
|
1555
CALL
United Parks & Resorts
PRKS
$2.11B
| $1.64M | ﹤0.01% |
635
+318
| +100% | +$8.11K |
|
1556
PUT
Tencent Music
TME
$14.5B
| $1.63M | ﹤0.01% |
903
+843
| +1,405% | +$13.5K |
|
|
HUYA
1557
Huya Inc
HUYA
$542M
| $1.63M | ﹤0.01% |
57,898
+46,730
| +418% | +$1.04M |
|
|
CMA
1558
PUT
DELISTED
Comerica
CMA
| $1.63M | ﹤0.01% |
222
-437
| -66% | -$35K |
|
1559
CALL
Ambarella
AMBA
$2.99B
| $1.62M | ﹤0.01% |
376
-163
| -30% | -$6.45K |
|
1560
CALL
Logitech
LOGI
$15.2B
| $1.62M | ﹤0.01% |
413
+382
| +1,232% | +$13.8K |
|
1561
PUT
ResMed
RMD
$28.3B
| $1.62M | ﹤0.01% |
156
-10
| -6% | -$1.03K |
|
1562
Seagate
STX
$193B
| $1.62M | ﹤0.01% |
33,827
+8,207
| +32% | +$364K |
|
1563
Domino's
DPZ
$11B
| $1.62M | ﹤0.01% |
6,272
-3,686
| -37% | -$958K |
|
1564
PUT
WEX
WEX
$6.11B
| $1.61M | ﹤0.01% |
84
+65
| +342% | +$11K |
|
|
THS
1565
DELISTED
Treehouse Foods
THS
| $1.61M | ﹤0.01% |
24,908
+15,206
| +157% | +$897K |
|
|
GRUB
1566
DELISTED
Just Eat Takeaway.com N.V. American Depositary Shares
GRUB
| $1.6M | ﹤0.01% |
11,556
+5,581
| +93% | +$865K |
|
1567
Lockheed Martin
LMT
$134B
| $1.6M | ﹤0.01% |
5,341
+4,126
| +340% | +$1.21M |
|
1568
PUT
PTC Therapeutics
PTCT
$6.37B
| $1.6M | ﹤0.01% |
426
+405
| +1,929% | +$13.6K |
|
1569
PUT
Deckers Outdoor
DECK
$13.3B
| $1.6M | ﹤0.01% |
654
-378
| -37% | -$8.59K |
|
|
ENV
1570
CALL
DELISTED
ENVESTNET, INC.
ENV
| $1.6M | ﹤0.01% |
245
+242
| +8,067% | +$13.9K |
|
|
WW
1571
CALL
DELISTED
WW International
WW
| $1.6M | ﹤0.01% |
795
-66
| -8% | -$1.82K |
|
|
SNP
1572
PUT
DELISTED
CHINA PETROLEUM & CHEMICAL CORPORATION ADS (REP 100 ORDINARY H SHARES)
SNP
| $1.6M | ﹤0.01% |
201
-126
| -39% | -$10.3K |
|
|
ESPR
1573
PUT
DELISTED
Esperion Therapeutics
ESPR
| $1.59M | ﹤0.01% |
397
-95
| -19% | -$4.26K |
|
|
NBIS
1574
CALL
Nebius Group N.V.
NBIS
$47.7B
| $1.59M | ﹤0.01% |
464
+108
| +30% | +$3.58K |
|
1575
PUT
Rogers Corp
ROG
$2.33B
| $1.59M | ﹤0.01% |
+100
| New | +$13.5K |
|
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.