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 |
Apple
AAPL
|
+$70.1M |
| 2 |
iShares 20+ Year Treasury Bond ETF
TLT
|
+$46.6M |
| 3 |
Alphabet (Google) Class C
GOOG
|
+$37.4M |
| 4 |
Amazon
AMZN
|
+$37M |
| 5 |
Tesla
TSLA
|
+$28M |
Top Sells
| Rank | Stock | Value |
|---|---|---|
| 1 |
Alibaba
BABA
|
+$41M |
| 2 |
Boeing
BA
|
+$27.8M |
| 3 |
Biogen
BIIB
|
+$18.9M |
| 4 |
SPDR Gold Trust
GLD
|
+$18.3M |
| 5 |
State Street SPDR Dow Jones Industrial Average ETF Trust
DIA
|
+$13.6M |
Sector Composition
| Rank | Sector | Weight |
|---|---|---|
| 1 | Miscellaneous | 97.26% |
| 2 | Technology | 0.76% |
| 3 | Consumer Discretionary | 0.58% |
| 4 | Communication Services | 0.34% |
| 5 | Healthcare | 0.32% |
| Name | Market Value | Portfolio Weight | Shares or Principal |
Change in Stake | Capital Flow | |
|---|---|---|---|---|---|---|
451
PUT
Axsome Therapeutics
AXSM
$10.8B
| $10.4M | 0.02% |
1,002
+628
| +168% | +$25.4K |
|
452
PUT
DexCom
DXCM
$33.2B
| $10.3M | 0.02% |
1,892
+1,124
| +146% | +$53.3K |
|
453
CALL
NetEase
NTES
$76.4B
| $10.3M | 0.02% |
1,685
+650
| +63% | +$38.1K |
|
454
PUT
Agilent Technologies
A
$42.5B
| $10.3M | 0.02% |
1,211
-37
| -3% | -$2.91K |
|
455
PUT
Wayfair
W
$13.6B
| $10.3M | 0.02% |
1,143
+7
| +0.6% | +$653 |
|
456
PUT
Qorvo
QRVO
$9.07B
| $10.3M | 0.02% |
888
+522
| +143% | +$50.5K |
|
457
PUT
General Dynamics
GD
$97.2B
| $10.3M | 0.02% |
584
+192
| +49% | +$34.5K |
|
458
PUT
Vanguard FTSE Europe ETF
VGK
$31.1B
| $10.3M | 0.02% |
2,278
+52
| +2% | +$2.91K |
|
|
459
CALL
Wayfair
W
$13.6B
| $10.2M | 0.02% |
1,127
+328
| +41% | +$30.6K |
|
460
CALL
Veeva Systems
VEEV
$44.5B
| $10.1M | 0.02% |
718
+99
| +16% | +$14.5K |
|
461
PUT
Advance Auto Parts
AAP
$2.67B
| $10.1M | 0.02% |
629
+31
| +5% | +$4.97K |
|
462
PUT
Lyft
LYFT
$6.33B
| $10.1M | 0.02% |
2,340
+564
| +32% | +$24.7K |
|
|
PPLC
463
PUT
DELISTED
PortfolioPlus S&P 500 ETF
PPLC
| $10.1M | 0.02% |
2,841
+281
| +11% | +$11.9K |
|
464
PUT
SBA Communications
SBAC
$20.1B
| $10M | 0.02% |
417
+166
| +66% | +$39.4K |
|
465
CALL
Pan American Silver
PAAS
$21.3B
| $10M | 0.02% |
4,228
+2,079
| +97% | +$38.5K |
|
|
ICPT
466
PUT
DELISTED
Intercept Pharmaceuticals, Inc.
ICPT
| $10M | 0.02% |
808
+453
| +128% | +$40.6K |
|
467
PUT
Sherwin-Williams
SHW
$81B
| $9.98M | 0.02% |
513
+51
| +11% | +$9.73K |
|
468
PUT
GE Aerospace
GE
$350B
| $9.96M | 0.02% |
1,790
-592
| -25% | -$30.6K |
|
469
PUT
United States Natural Gas Fund
UNG
$572M
| $9.88M | 0.02% |
1,466
+959
| +189% | +$74.3K |
|
470
CALL
Norfolk Southern
NSC
$74B
| $9.88M | 0.02% |
509
+293
| +136% | +$55K |
|
471
PUT
Ralph Lauren
RL
$20.9B
| $9.86M | 0.02% |
841
+188
| +29% | +$19.8K |
|
472
PUT
Las Vegas Sands
LVS
$28.7B
| $9.76M | 0.02% |
1,414
-689
| -33% | -$43K |
|
473
PUT
Mettler-Toledo International
MTD
$27B
| $9.76M | 0.02% |
123
+25
| +26% | +$18.1K |
|
474
PUT
SAP
SAP
$248B
| $9.73M | 0.02% |
726
-110
| -13% | -$14.5K |
|
475
Fidelity National Information Services
FIS
$21.6B
| $9.72M | 0.02% |
69,878
-9,725
| -12% | -$1.3M |
|
Similar funds
Simplex Trading's Q4 2019 Portfolio in Review
As of Q4 2019, Simplex Trading held 8,523 positions worth $45.7B, up 30% from $35.2B the previous quarter. Its ten largest holdings account for 39% of the portfolio.
Simplex Trading's Q4 2019 filing shows 1,277 new, 3,072 increased, 2,710 reduced and 1,251 closed positions. Its largest new stake was Apple: 1,090,316 shares worth $80M. The largest sale was Alibaba, an estimated $41M.
By sector, the portfolio is most concentrated in Miscellaneous at 97% of assets, down from 98% a quarter earlier, followed by Technology and Consumer Discretionary.
- Simplex Trading's largest Q4 2019 buy was Apple: 1,090,316 shares worth $80M.
- Simplex Trading added most to iShares 20+ Year Treasury Bond ETF in Q4 2019, an estimated $46.6M increase.
- Simplex Trading's biggest Q4 2019 reduction was Alibaba, cutting an estimated $41M.
- Simplex Trading fully exited Boeing in Q4 2019, selling an estimated $27.8M.
- Simplex Trading's ten largest holdings make up 39% of its $45.7B portfolio in Q4 2019.
- Simplex Trading opened 1,277 new positions and closed 1,251 in Q4 2019.
- Simplex Trading's portfolio value rose 30% quarter-over-quarter to $45.7B.
Based on Simplex Trading's 13F filing for Q4 2019, filed 5 Feb 2020.