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
| 1 |
Alibaba
BABA
|
+$48.9M |
| 2 |
Boeing
BA
|
+$25.8M |
| 3 |
SPDR Gold Trust
GLD
|
+$18.2M |
| 4 |
Biogen
BIIB
|
+$15.8M |
| 5 |
FedEx
FDX
|
+$13.6M |
Top Sells
| 1 |
Alphabet (Google) Class C
GOOG
|
+$62.1M |
| 2 |
iShares Russell 2000 ETF
IWM
|
+$36.4M |
| 3 |
Industrial Select Sector SPDR Fund
XLI
|
+$17.5M |
| 4 |
Netflix
NFLX
|
+$16.3M |
| 5 |
iShares 20+ Year Treasury Bond ETF
TLT
|
+$14.6M |
Sector Composition
| 1 | Consumer Discretionary | 16.74% |
| 2 | Technology | 16.32% |
| 3 | Healthcare | 12.17% |
| 4 | Industrials | 12.14% |
| 5 | Communication Services | 7.05% |
| Name | Market Value | Portfolio Weight | Shares or Principal |
Shares Change % | Capital Flow | |
|---|---|---|---|---|---|---|
|
GSKY
376
DELISTED
GreenSky, Inc. Class A Common Stock
GSKY
| $520K | ﹤0.01% |
76,070
+30,392
| +67% | +$208K |
|
|
AMRN
377
Amarin Corp
AMRN
$315M
| $518K | ﹤0.01% |
1,711
-1,846
| -52% | -$559K |
|
378
Cooper Companies
COO
$13.6B
| $511K | ﹤0.01% |
6,884
+2,380
| +53% | +$177K |
|
379
Avis
CAR
$5.56B
| $510K | ﹤0.01% |
18,075
-1,646
| -8% | -$46.4K |
|
|
SAGE
380
DELISTED
Sage Therapeutics
SAGE
| $509K | ﹤0.01% |
3,632
+1,414
| +64% | +$198K |
|
381
Ascendis Pharma
ASND
$12.3B
| $508K | ﹤0.01% |
5,284
+551
| +12% | +$53K |
|
|
GWR
382
DELISTED
Genesee & Wyoming Inc.
GWR
| $508K | ﹤0.01% |
4,601
-588
| -11% | -$64.9K |
|
|
BLUE
383
DELISTED
bluebird bio
BLUE
| $503K | ﹤0.01% |
+424
| New | +$503K |
|
384
HF Sinclair
DINO
$9.81B
| $502K | ﹤0.01% |
+9,369
| New | +$502K |
|
385
Energy Transfer Partners
ET
$58.9B
| $501K | ﹤0.01% |
38,365
-166,737
| -81% | -$2.18M |
|
386
Fox Class A
FOXA
$26.1B
| $498K | ﹤0.01% |
+15,815
| New | +$498K |
|
387
BioMarin Pharmaceuticals
BMRN
$10.7B
| $497K | ﹤0.01% |
+7,375
| New | +$497K |
|
388
Amphenol
APH
$143B
| $495K | ﹤0.01% |
20,540
-11,704
| -36% | -$282K |
|
389
Exponent
EXPO
$3.52B
| $493K | ﹤0.01% |
+7,058
| New | +$493K |
|
390
Direxion Daily S&P Biotech Bear 3X Shares
LABD
$70.4M
| $478K | ﹤0.01% |
944
-836
| -47% | -$423K |
|
391
Crown Holdings
CCK
$11B
| $477K | ﹤0.01% |
7,230
-5,577
| -44% | -$368K |
|
392
Ultragenyx Pharmaceutical
RARE
$3.04B
| $475K | ﹤0.01% |
+11,113
| New | +$475K |
|
393
National Vision
EYE
$1.8B
| $473K | ﹤0.01% |
19,662
+12,906
| +191% | +$310K |
|
394
A.O. Smith
AOS
$10.1B
| $472K | ﹤0.01% |
+9,910
| New | +$472K |
|
395
Celanese
CE
$4.89B
| $471K | ﹤0.01% |
+3,854
| New | +$471K |
|
396
Hartford Financial Services
HIG
$36.8B
| $471K | ﹤0.01% |
+7,785
| New | +$471K |
|
397
KeyCorp
KEY
$20.9B
| $469K | ﹤0.01% |
26,328
+18,065
| +219% | +$322K |
|
398
Vanguard Total World Stock ETF
VT
$52.2B
| $468K | ﹤0.01% |
6,258
-6,061
| -49% | -$453K |
|
399
United Parks & Resorts
PRKS
$2.86B
| $467K | ﹤0.01% |
17,763
-16,369
| -48% | -$430K |
|
400
Marvell Technology
MRVL
$57.6B
| $465K | ﹤0.01% |
18,634
+7,322
| +65% | +$183K |
|