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 |
NVIDIA
NVDA
|
+$216M |
| 2 |
Apple
AAPL
|
+$159M |
| 3 |
Broadcom
AVGO
|
+$128M |
| 4 |
Booking.com
BKNG
|
+$62.2M |
| 5 |
SPDR S&P 500 ETF Trust
SPY
|
+$61.9M |
Top Sells
| 1 |
iShares 20+ Year Treasury Bond ETF
TLT
|
+$141M |
| 2 |
Amazon
AMZN
|
+$53.1M |
| 3 |
TSMC
TSM
|
+$45.7M |
| 4 |
Netflix
NFLX
|
+$45.3M |
| 5 |
Pfizer
PFE
|
+$38.3M |
Sector Composition
| 1 | Technology | 34.74% |
| 2 | Communication Services | 9% |
| 3 | Consumer Discretionary | 8.67% |
| 4 | Healthcare | 8.07% |
| 5 | Financials | 6.4% |
| Name | Market Value | Portfolio Weight | Shares or Principal |
Shares Change % | Capital Flow | |
|---|---|---|---|---|---|---|
701
Sonos
SONO
$1.79B
| $375K | ﹤0.01% |
34,717
+2,814
| +9% | +$30.4K |
|
702
ITT
ITT
$13.6B
| $373K | ﹤0.01% |
+2,381
| New | +$373K |
|
703
Smith & Wesson
SWBI
$384M
| $373K | ﹤0.01% |
+43,019
| New | +$373K |
|
704
TripAdvisor
TRIP
$2.06B
| $372K | ﹤0.01% |
28,571
-152,143
| -84% | -$1.98M |
|
705
Absci
ABSI
$374M
| $371K | ﹤0.01% |
144,523
+55,395
| +62% | +$142K |
|
706
Technology Select Sector SPDR Fund
XLK
$86.4B
| $370K | ﹤0.01% |
1,465
-49,248
| -97% | -$12.4M |
|
707
Legend Biotech
LEGN
$6.18B
| $368K | ﹤0.01% |
10,371
+1,847
| +22% | +$65.5K |
|
708
McKesson
MCK
$87.4B
| $368K | ﹤0.01% |
+503
| New | +$368K |
|
709
PubMatic
PUBM
$370M
| $366K | ﹤0.01% |
29,432
+2,176
| +8% | +$27.1K |
|
710
HealthEquity
HQY
$7.94B
| $363K | ﹤0.01% |
3,466
-2,051
| -37% | -$215K |
|
711
Douglas Emmett
DEI
$2.74B
| $362K | ﹤0.01% |
24,104
+9,252
| +62% | +$139K |
|
712
Sprott Uranium Miners ETF
URNM
$1.77B
| $362K | ﹤0.01% |
7,555
-24,078
| -76% | -$1.15M |
|
713
Immersion
IMMR
$221M
| $361K | ﹤0.01% |
45,881
-27,419
| -37% | -$216K |
|
714
Melco Resorts & Entertainment
MLCO
$3.81B
| $358K | ﹤0.01% |
49,623
-23,726
| -32% | -$171K |
|
715
Replimune Group
REPL
$454M
| $358K | ﹤0.01% |
38,546
+32,900
| +583% | +$306K |
|
716
Healthcare Realty
HR
$6.46B
| $357K | ﹤0.01% |
+22,560
| New | +$357K |
|
717
Xeris Biopharma Holdings
XERS
$1.26B
| $357K | ﹤0.01% |
+76,644
| New | +$357K |
|
718
China Yuchai International
CYD
$1.39B
| $356K | ﹤0.01% |
14,912
-1,049
| -7% | -$25K |
|
719
Rockwell Automation
ROK
$38.3B
| $355K | ﹤0.01% |
+1,071
| New | +$355K |
|
720
Palladyne AI
PDYN
$289M
| $355K | ﹤0.01% |
41,066
+24,515
| +148% | +$212K |
|
721
Doximity
DOCS
$12.9B
| $354K | ﹤0.01% |
+5,786
| New | +$354K |
|
|
KREF
722
KKR Real Estate Finance Trust
KREF
$642M
| $354K | ﹤0.01% |
40,458
+25,682
| +174% | +$225K |
|
|
JNPR
723
DELISTED
Juniper Networks
JNPR
| $351K | ﹤0.01% |
8,794
+7,893
| +876% | +$315K |
|
724
Appian
APPN
$2.32B
| $349K | ﹤0.01% |
11,708
-11,944
| -50% | -$356K |
|
725
Companhia Siderúrgica Nacional
SID
$1.97B
| $349K | ﹤0.01% |
249,365
-49,306
| -17% | -$69K |
|