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 |
Amazon
AMZN
|
+$84.3M |
| 2 |
Alphabet (Google) Class A
GOOGL
|
+$37M |
| 3 |
Amgen
AMGN
|
+$32.3M |
| 4 |
Micron Technology
MU
|
+$29.4M |
| 5 |
Qualcomm
QCOM
|
+$18M |
Top Sells
| 1 |
SPDR S&P 500 ETF Trust
SPY
|
+$29.8M |
| 2 |
Gilead Sciences
GILD
|
+$29.3M |
| 3 |
Goldman Sachs
GS
|
+$27.7M |
| 4 |
Booking.com
BKNG
|
+$26M |
| 5 |
AT&T
T
|
+$20.8M |
Sector Composition
| 1 | Technology | 20.65% |
| 2 | Communication Services | 17.64% |
| 3 | Consumer Discretionary | 14.77% |
| 4 | Healthcare | 11.1% |
| 5 | Financials | 6.35% |
| Name | Market Value | Portfolio Weight | Shares or Principal |
Shares Change % | Capital Flow | |
|---|---|---|---|---|---|---|
751
Ironwood Pharmaceuticals
IRWD
$187M
| $148K | 0.01% |
9,385
+6,042
| +181% | +$95.3K |
|
752
Regency Centers
REG
$13.1B
| $148K | 0.01% |
2,370
-9,271
| -80% | -$579K |
|
|
DFT
753
DELISTED
DuPont Fabros Technology Inc.
DFT
| $148K | 0.01% |
+2,420
| New | +$148K |
|
754
Corbus Pharmaceuticals
CRBP
$118M
| $147K | 0.01% |
+782
| New | +$147K |
|
|
SXE
755
DELISTED
Southcross Energy Partners, L.P.
SXE
| $147K | 0.01% |
46,556
+18,288
| +65% | +$57.7K |
|
756
Ambarella
AMBA
$3.56B
| $146K | 0.01% |
3,027
-2,108
| -41% | -$102K |
|
757
Patterson-UTI
PTEN
$2.11B
| $146K | 0.01% |
+7,261
| New | +$146K |
|
|
GLOG
758
DELISTED
GASLOG LTD
GLOG
| $146K | 0.01% |
+9,614
| New | +$146K |
|
|
STRP
759
DELISTED
Straight Path Communications Inc.
STRP
| $146K | 0.01% |
815
-27,941
| -97% | -$5.01M |
|
760
Adecoagro
AGRO
$816M
| $145K | 0.01% |
14,515
+11,367
| +361% | +$114K |
|
761
Encore Capital Group
ECPG
$993M
| $145K | 0.01% |
3,628
-11,735
| -76% | -$469K |
|
762
TTEC Holdings
TTEC
$179M
| $145K | 0.01% |
+3,555
| New | +$145K |
|
763
Banco Bradesco
BBD
$33B
| $144K | 0.01% |
+29,838
| New | +$144K |
|
764
iShares MSCI Australia ETF
EWA
$1.54B
| $143K | 0.01% |
6,596
+93
| +1% | +$2.02K |
|
765
LG Display
LPL
$4.33B
| $143K | 0.01% |
8,938
+7,610
| +573% | +$122K |
|
766
Republic Services
RSG
$71.3B
| $143K | 0.01% |
+2,255
| New | +$143K |
|
767
Alkermes
ALKS
$4.45B
| $142K | 0.01% |
2,460
-4,723
| -66% | -$273K |
|
768
Transocean
RIG
$3.06B
| $142K | 0.01% |
17,346
-7,196
| -29% | -$58.9K |
|
769
Cohu
COHU
$976M
| $141K | 0.01% |
+8,959
| New | +$141K |
|
|
KG
770
Kestrel Group, Ltd.
KG
$199M
| $141K | 0.01% |
+637
| New | +$141K |
|
771
iShares MSCI India ETF
INDA
$9.38B
| $140K | 0.01% |
4,387
+1,823
| +71% | +$58.2K |
|
772
STMicroelectronics
STM
$23B
| $140K | 0.01% |
9,743
-31,743
| -77% | -$456K |
|
773
Theravance Biopharma
TBPH
$687M
| $140K | 0.01% |
+3,538
| New | +$140K |
|
|
PRTY
774
DELISTED
Party City Holdco Inc.
PRTY
| $140K | 0.01% |
+8,982
| New | +$140K |
|
775
US Foods
USFD
$17.5B
| $139K | 0.01% |
+5,140
| New | +$139K |
|