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 |
Alphabet (Google) Class C
GOOG
|
$54.6M |
| 2 |
iShares Russell 2000 ETF
IWM
|
$52.5M |
| 3 |
SPDR S&P 500 ETF Trust
SPY
|
$40.9M |
| 4 |
Apple
AAPL
|
$16.5M |
| 5 |
Visa
V
|
$12M |
Top Sells
| 1 |
Amazon
AMZN
|
$98.7M |
| 2 |
Meta Platforms (Facebook)
META
|
$70.7M |
| 3 |
Invesco QQQ Trust
QQQ
|
$33.4M |
| 4 |
Goldman Sachs
GS
|
$30.2M |
| 5 |
Boeing
BA
|
$26.5M |
Sector Composition
| 1 | Communication Services | 14.71% |
| 2 | Consumer Discretionary | 14.32% |
| 3 | Technology | 11.86% |
| 4 | Financials | 7.38% |
| 5 | Industrials | 6.44% |
| Name | Market Value | Portfolio Weight | Shares or Principal |
Shares Change % | Capital Flow | |
|---|---|---|---|---|---|---|
251
Magna International
MGA
$12.9B
| $878K | ﹤0.01% |
+19,331
| New | +$878K |
|
|
NATI
252
DELISTED
National Instruments Corp
NATI
| $877K | ﹤0.01% |
19,338
+19,155
| +10,467% | +$869K |
|
|
BLUE
253
DELISTED
bluebird bio
BLUE
| $875K | ﹤0.01% |
+681
| New | +$875K |
|
|
PBCT
254
DELISTED
People's United Financial Inc
PBCT
| $863K | ﹤0.01% |
59,842
+37,340
| +166% | +$538K |
|
255
iShares Select Dividend ETF
DVY
$20.8B
| $862K | ﹤0.01% |
9,658
+6,814
| +240% | +$608K |
|
256
Pultegroup
PHM
$27.7B
| $861K | ﹤0.01% |
+33,137
| New | +$861K |
|
257
Lennar Class A
LEN
$36.7B
| $859K | ﹤0.01% |
+22,682
| New | +$859K |
|
|
SGI
258
Somnigroup International Inc.
SGI
$18.3B
| $844K | ﹤0.01% |
81,596
+28,616
| +54% | +$296K |
|
259
Brunswick
BC
$4.35B
| $831K | ﹤0.01% |
+17,895
| New | +$831K |
|
260
Westlake Corp
WLK
$11.5B
| $831K | ﹤0.01% |
12,562
+7,658
| +156% | +$507K |
|
261
Consolidated Edison
ED
$35.4B
| $825K | ﹤0.01% |
+10,796
| New | +$825K |
|
|
262
Alphabet (Google) Class A
GOOGL
$2.84T
| $819K | ﹤0.01% |
15,680
-229,220
| -94% | -$12M |
|
263
Supernus Pharmaceuticals
SUPN
$2.58B
| $816K | ﹤0.01% |
24,583
+19,577
| +391% | +$650K |
|
264
Dana Inc
DAN
$2.7B
| $813K | ﹤0.01% |
59,688
+19,060
| +47% | +$260K |
|
265
International Flavors & Fragrances
IFF
$16.9B
| $813K | ﹤0.01% |
+6,055
| New | +$813K |
|
266
DocuSign
DOCU
$16.1B
| $806K | ﹤0.01% |
+20,111
| New | +$806K |
|
267
Ventas
VTR
$30.9B
| $805K | ﹤0.01% |
13,750
-2,445
| -15% | -$143K |
|
268
Extreme Networks
EXTR
$2.87B
| $800K | ﹤0.01% |
131,226
+11,009
| +9% | +$67.1K |
|
|
ZAYO
269
DELISTED
Zayo Group Holdings, Inc.
ZAYO
| $795K | ﹤0.01% |
34,846
+23,828
| +216% | +$544K |
|
270
iShares Biotechnology ETF
IBB
$5.8B
| $792K | ﹤0.01% |
+8,221
| New | +$792K |
|
271
Bread Financial
BFH
$3.09B
| $783K | ﹤0.01% |
6,543
+3,408
| +109% | +$408K |
|
272
Johnson Controls International
JCI
$69.5B
| $780K | ﹤0.01% |
26,339
+16,597
| +170% | +$492K |
|
|
BZUN
273
Baozun
BZUN
$223M
| $776K | ﹤0.01% |
26,568
-31,842
| -55% | -$930K |
|
274
Carlyle Group
CG
$23.1B
| $770K | ﹤0.01% |
48,918
+27,465
| +128% | +$432K |
|
275
Dynavax Technologies
DVAX
$1.18B
| $766K | ﹤0.01% |
83,805
-15,835
| -16% | -$145K |
|