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 |
Alibaba
BABA
|
+$50.3M |
| 2 |
Boeing
BA
|
+$24.3M |
| 3 |
SPDR Gold Trust
GLD
|
+$18.3M |
| 4 |
Biogen
BIIB
|
+$15.9M |
| 5 |
FedEx
FDX
|
+$15.1M |
Top Sells
| Rank | Stock | Value |
|---|---|---|
| 1 |
Alphabet (Google) Class C
GOOG
|
+$60.3M |
| 2 |
iShares Russell 2000 ETF
IWM
|
+$36.4M |
| 3 |
Netflix
NFLX
|
+$19M |
| 4 |
State Street Industrial Select Sector SPDR ETF
XLI
|
+$17.3M |
| 5 |
iShares 20+ Year Treasury Bond ETF
TLT
|
+$14.2M |
Sector Composition
| Rank | Sector | Weight |
|---|---|---|
| 1 | Consumer Discretionary | 0.49% |
| 2 | Technology | 0.48% |
| 3 | Healthcare | 0.35% |
| 4 | Industrials | 0.35% |
| 5 | Communication Services | 0.21% |
| Name | Market Value | Portfolio Weight | Shares or Principal |
Change in Stake | Capital Flow | |
|---|---|---|---|---|---|---|
501
CALL
Allegiant Air
ALGT
$2.54B
| $7.72M | 0.02% |
516
+447
| +648% | +$65.5K |
|
502
CALL
Best Buy
BBY
$17.8B
| $7.72M | 0.02% |
1,119
-279
| -20% | -$19.5K |
|
503
PUT
Intercontinental Exchange
ICE
$81B
| $7.7M | 0.02% |
835
+264
| +46% | +$24.1K |
|
504
CALL
T. Rowe Price
TROW
$24.6B
| $7.7M | 0.02% |
674
+214
| +47% | +$23.8K |
|
505
PUT
Diamondback Energy
FANG
$57.8B
| $7.67M | 0.02% |
853
+214
| +33% | +$21.3K |
|
506
PUT
Sarepta Therapeutics
SRPT
$1.68B
| $7.67M | 0.02% |
1,018
+66
| +7% | +$7.79K |
|
|
EXAS
507
CALL
DELISTED
Exact Sciences
EXAS
| $7.64M | 0.02% |
845
+352
| +71% | +$40.1K |
|
|
DOCU
508
CALL
DocuSign
DOCU
$8.98B
| $7.57M | 0.02% |
1,223
+326
| +36% | +$17.1K |
|
509
CALL
Carnival Corporation Ltd
CCL
$34.6B
| $7.55M | 0.02% |
1,728
-69
| -4% | -$3.18K |
|
|
MLNX
510
PUT
DELISTED
Mellanox Technologies, Ltd.
MLNX
| $7.55M | 0.02% |
689
+436
| +172% | +$48.1K |
|
511
CALL
Rio Tinto
RIO
$149B
| $7.54M | 0.02% |
1,448
-477
| -25% | -$25.9K |
|
512
CALL
Corning
GLW
$134B
| $7.54M | 0.02% |
2,643
+95
| +4% | +$2.84K |
|
513
PUT
GSK
GSK
$102B
| $7.53M | 0.02% |
1,411
+585
| +71% | +$30.1K |
|
514
CALL
Spotify
SPOT
$96.4B
| $7.52M | 0.02% |
660
-668
| -50% | -$94.3K |
|
515
PUT
Chemed
CHE
$6.68B
| $7.52M | 0.02% |
180
+178
| +8,900% | +$72.7K |
|
516
PUT
Cintas
CTAS
$81.3B
| $7.51M | 0.02% |
1,120
+284
| +34% | +$18.2K |
|
517
PUT
PG&E
PCG
$47B
| $7.5M | 0.02% |
7,505
+3,095
| +70% | +$46.8K |
|
518
CALL
Phillips 66
PSX
$83B
| $7.5M | 0.02% |
733
-67
| -8% | -$6.71K |
|
|
TYNS
519
CALL
DELISTED
Direxion Daily 7-10 Year Treasury Bear 1X Shares
TYNS
| $7.47M | 0.02% |
1,908
+338
| +22% | +$8.87K |
|
520
CALL
Hershey
HSY
$34.9B
| $7.47M | 0.02% |
482
-84
| -15% | -$12.7K |
|
521
PUT
Ionis Pharmaceuticals
IONS
$9.23B
| $7.45M | 0.02% |
1,243
+52
| +4% | +$3.39K |
|
|
522
CALL
GSK
GSK
$102B
| $7.42M | 0.02% |
1,390
-29
| -2% | -$1.49K |
|
523
PUT
XPO
XPO
$25.1B
| $7.4M | 0.02% |
2,990
+200
| +7% | +$4.62K |
|
524
PUT
CF Industries
CF
$19.5B
| $7.39M | 0.02% |
1,503
+80
| +6% | +$3.88K |
|
525
PUT
Zoom
ZM
$24.7B
| $7.39M | 0.02% |
970
+36
| +4% | +$3.24K |
|
Similar funds
Simplex Trading's Q3 2019 Portfolio in Review
As of Q3 2019, Simplex Trading held 8,410 positions worth $35.2B, down 4.1% from $36.6B the previous quarter. Its ten largest holdings account for 33% of the portfolio.
Simplex Trading's Q3 2019 filing shows 1,312 new, 3,129 increased, 2,596 reduced and 1,163 closed positions. Its largest new stake was SPDR Gold Trust: 131,281 shares worth $18.2M. The largest sale was Alphabet (Google) Class C, an estimated $60.3M.
By sector, the portfolio is most concentrated in Consumer Discretionary at 0.49% of assets, up from 0.26% a quarter earlier, followed by Technology and Healthcare.
- Simplex Trading's largest Q3 2019 buy was SPDR Gold Trust: 131,281 shares worth $18.2M.
- Simplex Trading added most to Alibaba in Q3 2019, an estimated $50.3M increase.
- Simplex Trading's biggest Q3 2019 reduction was Alphabet (Google) Class C, cutting an estimated $60.3M.
- Simplex Trading fully exited iShares Russell 2000 ETF in Q3 2019, selling an estimated $36.4M.
- Simplex Trading's ten largest holdings make up 33% of its $35.2B portfolio in Q3 2019.
- Simplex Trading opened 1,312 new positions and closed 1,163 in Q3 2019.
- Simplex Trading's portfolio value fell 4.1% quarter-over-quarter to $35.2B.
Based on Simplex Trading's 13F filing for Q3 2019, filed 15 Oct 2019.