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 | |
|---|---|---|---|---|---|---|
2451
PUT
Ametek
AME
$55.5B
| $613K | ﹤0.01% |
74
+71
| +2,367% | +$5.39K |
|
2452
CALL
Chemours
CC
$2.59B
| $613K | ﹤0.01% |
165
+69
| +72% | +$2.51K |
|
2453
Devon Energy
DVN
$51.9B
| $613K | ﹤0.01% |
19,453
-30,972
| -61% | -$865K |
|
2454
MGM Resorts International
MGM
$11.7B
| $613K | ﹤0.01% |
23,919
-56,773
| -70% | -$1.56M |
|
2455
CALL
ScottsMiracle-Gro
SMG
$4.03B
| $612K | ﹤0.01% |
78
-15
| -16% | -$1.13K |
|
2456
CALL
Toro Company
TTC
$8.93B
| $612K | ﹤0.01% |
+89
| New | +$5.65K |
|
2457
PUT
Unum
UNM
$13.8B
| $612K | ﹤0.01% |
181
+98
| +118% | +$3.41K |
|
|
BRSL
2458
PUT
Brightstar Lottery PLC
BRSL
$1.91B
| $611K | ﹤0.01% |
471
-134
| -22% | -$2.06K |
|
2459
PUT
Schwab US Broad Market ETF
SCHB
$42.8B
| $611K | ﹤0.01% |
684
+654
| +2,180% | +$7.14K |
|
|
NRE
2460
CALL
DELISTED
NorthStar Realty Europe Corp.
NRE
| $611K | ﹤0.01% |
352
+347
| +6,940% | +$5.9K |
|
2461
CALL
Element Solutions
ESI
$9.12B
| $610K | ﹤0.01% |
604
+290
| +92% | +$3.21K |
|
2462
PUT
Primerica
PRI
$9.81B
| $610K | ﹤0.01% |
50
+38
| +317% | +$4.38K |
|
2463
PUT
EQT Corp
EQT
$33.2B
| $609K | ﹤0.01% |
299
-66
| -18% | -$1.29K |
|
2464
CALL
MacroGenics
MGNX
$235M
| $609K | ﹤0.01% |
+339
| New | +$5.86K |
|
2465
CALL
Chemed
CHE
$6.78B
| $608K | ﹤0.01% |
19
| – | – |
|
2466
PUT
Invesco
IVZ
$13.3B
| $606K | ﹤0.01% |
314
+135
| +75% | +$2.52K |
|
|
MGLN
2467
CALL
DELISTED
Magellan Health Services, Inc.
MGLN
| $606K | ﹤0.01% |
92
+90
| +4,500% | +$5.78K |
|
2468
Interactive Brokers
IBKR
$40.9B
| $605K | ﹤0.01% |
46,704
+37,348
| +399% | +$491K |
|
2469
CALL
Marcus Corp
MCS
$732M
| $604K | ﹤0.01% |
+151
| New | +$6.25K |
|
2470
MSCI
MSCI
$40B
| $603K | ﹤0.01% |
3,035
-7,825
| -72% | -$1.36M |
|
2471
CALL
Progress Software
PRGS
$1.55B
| $603K | ﹤0.01% |
136
+135
| +13,500% | +$4.94K |
|
2472
Toyota
TM
$210B
| $603K | ﹤0.01% |
5,111
+2,251
| +79% | +$272K |
|
|
STML
2473
PUT
DELISTED
Stemline Therapeutics, Inc.
STML
| $603K | ﹤0.01% |
470
+305
| +185% | +$3.45K |
|
|
RDUS
2474
PUT
DELISTED
Radius Health, Inc.
RDUS
| $602K | ﹤0.01% |
302
+25
| +9% | +$456 |
|
2475
PUT
Viking Therapeutics
VKTX
$4.04B
| $601K | ﹤0.01% |
605
+218
| +56% | +$1.82K |
|
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.