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 | |
|---|---|---|---|---|---|---|
826
Builders FirstSource
BLDR
$16.4B
| $111K | ﹤0.01% |
10,235
+5,395
| +111% | +$58.5K |
|
827
Turkcell
TKC
$4.78B
| $111K | ﹤0.01% |
19,915
+13,791
| +225% | +$76.9K |
|
|
TECD
828
DELISTED
Tech Data Corp
TECD
| $111K | ﹤0.01% |
+1,358
| New | +$111K |
|
829
Corbus Pharmaceuticals
CRBP
$118M
| $110K | ﹤0.01% |
632
-149
| -19% | -$25.9K |
|
830
Franklin Electric
FELE
$4.28B
| $110K | ﹤0.01% |
2,570
+1,825
| +245% | +$78.1K |
|
831
SLM Corp
SLM
$6.03B
| $110K | ﹤0.01% |
+13,297
| New | +$110K |
|
832
UFP Industries
UFPI
$6B
| $110K | ﹤0.01% |
+4,265
| New | +$110K |
|
|
AM
833
DELISTED
ANTERO MIDSTREAM PARTNERS LP
AM
| $110K | ﹤0.01% |
+5,166
| New | +$110K |
|
834
AudioCodes
AUDC
$294M
| $108K | ﹤0.01% |
10,957
+4,134
| +61% | +$40.7K |
|
|
MFA
835
MFA Financial
MFA
$1.05B
| $108K | ﹤0.01% |
4,060
+2,273
| +127% | +$60.5K |
|
836
Zscaler
ZS
$45B
| $108K | ﹤0.01% |
2,763
-2,608
| -49% | -$102K |
|
|
SUM
837
DELISTED
Summit Materials, Inc. Class A Common Stock
SUM
| $108K | ﹤0.01% |
8,920
-10,159
| -53% | -$123K |
|
|
SIX
838
DELISTED
Six Flags Entertainment Corp.
SIX
| $108K | ﹤0.01% |
+1,946
| New | +$108K |
|
839
Fate Therapeutics
FATE
$119M
| $107K | ﹤0.01% |
8,394
+8,280
| +7,263% | +$106K |
|
840
nLIGHT
LASR
$1.47B
| $107K | ﹤0.01% |
+6,035
| New | +$107K |
|
841
Owens Corning
OC
$13.1B
| $107K | ﹤0.01% |
2,449
-10,876
| -82% | -$475K |
|
|
MDRX
842
DELISTED
Veradigm Inc. Common Stock
MDRX
| $107K | ﹤0.01% |
11,185
+6,423
| +135% | +$61.4K |
|
|
AVYA
843
DELISTED
Avaya Holdings Corp. Common Stock
AVYA
| $107K | ﹤0.01% |
7,386
+1,681
| +29% | +$24.4K |
|
844
IAMGOLD
IAG
$6.32B
| $105K | ﹤0.01% |
28,601
+27,701
| +3,078% | +$102K |
|
|
HZNP
845
DELISTED
Horizon Therapeutics Public Limited Company Ordinary Shares
HZNP
| $105K | ﹤0.01% |
5,420
+3,680
| +211% | +$71.3K |
|
846
Commercial Metals
CMC
$6.59B
| $104K | ﹤0.01% |
6,531
+3,444
| +112% | +$54.8K |
|
847
Dolby
DLB
$6.89B
| $104K | ﹤0.01% |
1,689
-435
| -20% | -$26.8K |
|
|
AVLR
848
DELISTED
Avalara, Inc.
AVLR
| $104K | ﹤0.01% |
3,360
+3,278
| +3,998% | +$101K |
|
849
Gildan
GIL
$8.22B
| $103K | ﹤0.01% |
+3,416
| New | +$103K |
|
850
Home Depot
HD
$421B
| $103K | ﹤0.01% |
600
-38,779
| -98% | -$6.66M |
|