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
|
$29.3M |
| 2 |
Industrial Select Sector SPDR Fund
XLI
|
$23.1M |
| 3 |
iShares Russell 2000 ETF
IWM
|
$18M |
| 4 |
Netflix
NFLX
|
$17.4M |
| 5 |
iShares 20+ Year Treasury Bond ETF
TLT
|
$14M |
Top Sells
| 1 |
Invesco QQQ Trust
QQQ
|
$120M |
| 2 |
SPDR S&P 500 ETF Trust
SPY
|
$41.3M |
| 3 |
Walt Disney
DIS
|
$26.9M |
| 4 |
Alphabet (Google) Class A
GOOGL
|
$13.8M |
| 5 |
Johnson & Johnson
JNJ
|
$11.3M |
Sector Composition
| 1 | Technology | 16.22% |
| 2 | Communication Services | 16.19% |
| 3 | Healthcare | 11.36% |
| 4 | Industrials | 9.74% |
| 5 | Consumer Discretionary | 8.61% |
| Name | Market Value | Portfolio Weight | Shares or Principal |
Shares Change % | Capital Flow | |
|---|---|---|---|---|---|---|
251
Apollo Global Management
APO
$76.9B
| $957K | ﹤0.01% |
27,910
-11,761
| -30% | -$403K |
|
252
SPDR S&P Bank ETF
KBE
$1.62B
| $952K | ﹤0.01% |
21,972
-387
| -2% | -$16.8K |
|
253
Marathon Petroleum
MPC
$55.1B
| $947K | ﹤0.01% |
16,948
+1,790
| +12% | +$100K |
|
254
Banco Santander
SAN
$145B
| $946K | ﹤0.01% |
215,712
+193,259
| +861% | +$848K |
|
255
Bilibili
BILI
$9.31B
| $941K | ﹤0.01% |
57,851
-15,010
| -21% | -$244K |
|
|
SLCA
256
DELISTED
U.S. SILICA HOLDINGS, INC.
SLCA
| $929K | ﹤0.01% |
72,654
+7,937
| +12% | +$101K |
|
257
Vanguard S&P 500 ETF
VOO
$730B
| $927K | ﹤0.01% |
+3,445
| New | +$927K |
|
258
Vanguard Total World Stock ETF
VT
$52.1B
| $925K | ﹤0.01% |
12,319
+9,622
| +357% | +$722K |
|
259
Northrop Grumman
NOC
$83.3B
| $923K | ﹤0.01% |
2,857
-6,253
| -69% | -$2.02M |
|
260
Toyota
TM
$264B
| $920K | ﹤0.01% |
7,420
+2,309
| +45% | +$286K |
|
261
Vanguard FTSE Europe ETF
VGK
$27.1B
| $919K | ﹤0.01% |
+16,752
| New | +$919K |
|
|
GBT
262
DELISTED
Global Blood Therapeutics, Inc.
GBT
| $918K | ﹤0.01% |
17,467
+10,062
| +136% | +$529K |
|
263
Smith & Nephew
SNN
$16.7B
| $917K | ﹤0.01% |
21,076
+13,914
| +194% | +$605K |
|
264
United Parcel Service
UPS
$71.5B
| $901K | ﹤0.01% |
+8,728
| New | +$901K |
|
265
Sony
SONY
$171B
| $897K | ﹤0.01% |
+85,665
| New | +$897K |
|
266
CRA International
CRAI
$1.27B
| $892K | ﹤0.01% |
23,296
+20,590
| +761% | +$788K |
|
267
MaxLinear
MXL
$1.38B
| $892K | ﹤0.01% |
38,069
+35,639
| +1,467% | +$835K |
|
268
Take-Two Interactive
TTWO
$45.9B
| $889K | ﹤0.01% |
7,838
-11,466
| -59% | -$1.3M |
|
269
Acadia Pharmaceuticals
ACAD
$4.28B
| $883K | ﹤0.01% |
33,045
-35,136
| -52% | -$939K |
|
270
Materials Select Sector SPDR Fund
XLB
$5.52B
| $877K | ﹤0.01% |
15,000
-21,770
| -59% | -$1.27M |
|
271
OFG Bancorp
OFG
$1.97B
| $867K | ﹤0.01% |
36,506
+6,149
| +20% | +$146K |
|
272
FibroGen
FGEN
$45.1M
| $866K | ﹤0.01% |
+767
| New | +$866K |
|
|
LM
273
DELISTED
Legg Mason, Inc.
LM
| $863K | ﹤0.01% |
22,569
+1,334
| +6% | +$51K |
|
|
AIFU
274
AIFU Inc. Class A Ordinary Share
AIFU
$86.5M
| $858K | ﹤0.01% |
+1,282
| New | +$858K |
|
275
VanEck Biotech ETF
BBH
$355M
| $857K | ﹤0.01% |
6,645
-360
| -5% | -$46.4K |
|