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 | |
|---|---|---|---|---|---|---|
376
G-III Apparel Group
GIII
$1.12B
| $493K | ﹤0.01% |
17,694
+14,948
| +544% | +$416K |
|
377
Treehouse Foods
THS
$917M
| $491K | ﹤0.01% |
9,702
-1,719
| -15% | -$87K |
|
|
DCP
378
DELISTED
DCP Midstream, LP
DCP
| $489K | ﹤0.01% |
18,494
+18,028
| +3,869% | +$477K |
|
379
Norwegian Cruise Line
NCLH
$11.6B
| $488K | ﹤0.01% |
11,528
+11,222
| +3,667% | +$475K |
|
|
CASA
380
DELISTED
Casa Systems, Inc. Common Stock
CASA
| $480K | ﹤0.01% |
36,579
-14,662
| -29% | -$192K |
|
381
ProShares Short VIX Short-Term Futures ETF
SVXY
$250M
| $478K | ﹤0.01% |
22,632
+15,062
| +199% | +$318K |
|
382
Olin
OLN
$2.9B
| $476K | ﹤0.01% |
23,702
+7,962
| +51% | +$160K |
|
383
Bilibili
BILI
$9.25B
| $474K | ﹤0.01% |
32,493
+19,055
| +142% | +$278K |
|
|
STMP
384
DELISTED
Stamps.com, Inc.
STMP
| $471K | ﹤0.01% |
+3,027
| New | +$471K |
|
385
TE Connectivity
TEL
$61.7B
| $470K | ﹤0.01% |
6,226
+6,082
| +4,224% | +$459K |
|
386
Progressive
PGR
$143B
| $469K | ﹤0.01% |
+7,788
| New | +$469K |
|
387
Marsh & McLennan
MMC
$100B
| $468K | ﹤0.01% |
5,870
-1,490
| -20% | -$119K |
|
388
Church & Dwight Co
CHD
$23.3B
| $467K | ﹤0.01% |
7,110
-2,071
| -23% | -$136K |
|
|
BKS
389
DELISTED
Barnes & Noble
BKS
| $463K | ﹤0.01% |
65,427
+8,135
| +14% | +$57.6K |
|
390
CF Industries
CF
$13.7B
| $462K | ﹤0.01% |
+10,626
| New | +$462K |
|
391
Sangamo Therapeutics
SGMO
$165M
| $461K | ﹤0.01% |
40,180
+23,220
| +137% | +$266K |
|
392
Synopsys
SNPS
$111B
| $457K | ﹤0.01% |
5,427
-237
| -4% | -$20K |
|
393
Lennox International
LII
$20.3B
| $452K | ﹤0.01% |
2,066
+1,307
| +172% | +$286K |
|
|
AIV
394
Aimco
AIV
$1.11B
| $450K | ﹤0.01% |
+77,065
| New | +$450K |
|
395
Synchrony
SYF
$28.1B
| $450K | ﹤0.01% |
+19,219
| New | +$450K |
|
|
MDSO
396
DELISTED
Medidata Solutions, Inc.
MDSO
| $444K | ﹤0.01% |
6,590
+2,165
| +49% | +$146K |
|
397
Nektar Therapeutics
NKTR
$764M
| $443K | ﹤0.01% |
899
-1,064
| -54% | -$524K |
|
398
Ambac
AMBC
$422M
| $441K | ﹤0.01% |
25,584
-34,614
| -58% | -$597K |
|
399
Verisk Analytics
VRSK
$37.8B
| $438K | ﹤0.01% |
4,018
+2,847
| +243% | +$310K |
|
400
Global X Uranium ETF
URA
$4.17B
| $435K | ﹤0.01% |
37,294
+32,142
| +624% | +$375K |
|