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 | |
|---|---|---|---|---|---|---|
1351
CALL
Aon
AON
$77.3B
| $2.06M | 0.01% |
121
+68
| +128% | +$11K |
|
1352
CALL
Wolfspeed
WOLF
$1.2B
| $2.06M | 0.01% |
360
-97
| -21% | -$4.98K |
|
1353
CALL
Stellantis
STLA
$16.5B
| $2.06M | 0.01% |
1,386
-1,482
| -52% | -$22.8K |
|
1354
CALL
Teradata
TDC
$2.68B
| $2.06M | 0.01% |
471
+254
| +117% | +$11.4K |
|
1355
PUT
Transocean
RIG
$5.92B
| $2.05M | 0.01% |
2,358
+435
| +23% | +$3.73K |
|
|
MRO
1356
PUT
DELISTED
Marathon Oil Corporation
MRO
| $2.05M | 0.01% |
1,229
-354
| -22% | -$5.78K |
|
1357
United Rentals
URI
$71.1B
| $2.05M | 0.01% |
+17,944
| New | +$2.22M |
|
|
ACB
1358
Aurora Cannabis
ACB
$165M
| $2.05M | 0.01% |
1,885
+1,329
| +239% | +$1.19M |
|
1359
PUT
West Pharmaceutical
WST
$23.1B
| $2.05M | 0.01% |
186
-75
| -29% | -$7.8K |
|
1360
PUT
Tetra Tech
TTEK
$8.23B
| $2.04M | 0.01% |
+1,715
| New | +$19.2K |
|
|
CEO
1361
PUT
DELISTED
CNOOC Limited
CEO
| $2.04M | 0.01% |
110
-494
| -82% | -$83.6K |
|
1362
State Street Materials Select Sector SPDR ETF
XLB
$8.51B
| $2.04M | 0.01% |
73,540
-140,696
| -66% | -$3.79M |
|
1363
PUT
Boston Scientific
BSX
$65.8B
| $2.03M | 0.01% |
530
-1,114
| -68% | -$42.5K |
|
1364
CALL
Amdocs
DOX
$5.53B
| $2.03M | 0.01% |
375
-84
| -18% | -$4.72K |
|
|
ANSS
1365
PUT
DELISTED
Ansys
ANSS
| $2.03M | 0.01% |
111
+63
| +131% | +$10.7K |
|
|
GTT
1366
PUT
DELISTED
GTT Communications, Inc.
GTT
| $2.02M | 0.01% |
583
+486
| +501% | +$14.3K |
|
1367
CALL
Madison Square Garden
MSGS
$9.54B
| $2.02M | 0.01% |
97
+89
| +1,113% | +$18.1K |
|
|
SEE
1368
PUT
DELISTED
Sealed Air
SEE
| $2.02M | 0.01% |
439
+27
| +7% | +$1.12K |
|
1369
CALL
Fluor
FLR
$7.29B
| $2.02M | 0.01% |
549
+326
| +146% | +$11.9K |
|
1370
CALL
Moody's
MCO
$81.7B
| $2.01M | 0.01% |
111
+48
| +76% | +$7.89K |
|
1371
CALL
Paychex
PAYX
$40.4B
| $2M | 0.01% |
250
-558
| -69% | -$41.1K |
|
1372
Direxion Daily Technology Bull 3x ETF
TECL
$5.14B
| $2M | 0.01% |
+144,330
| New | +$1.61M |
|
1373
PUT
Sempra
SRE
$60.8B
| $1.99M | 0.01% |
316
-148
| -32% | -$8.72K |
|
1374
PUT
Synaptics
SYNA
$4.41B
| $1.99M | 0.01% |
500
+271
| +118% | +$10.7K |
|
1375
AT&T
T
$165B
| $1.99M | 0.01% |
+83,912
| New | +$1.93M |
|
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.