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 |
Microsoft
MSFT
|
+$101M |
| 2 |
NVIDIA
NVDA
|
+$66M |
| 3 |
Citigroup
C
|
+$51.8M |
| 4 |
Berkshire Hathaway Class B
BRK.B
|
+$42.7M |
| 5 |
SPDR Gold Trust
GLD
|
+$39.4M |
Top Sells
| 1 |
Apple
AAPL
|
+$411M |
| 2 |
Vanguard S&P 500 ETF
VOO
|
+$64M |
| 3 |
Meta Platforms (Facebook)
META
|
+$39.8M |
| 4 |
iShares Core S&P 500 ETF
IVV
|
+$34.3M |
| 5 |
PayPal
PYPL
|
+$32.9M |
Sector Composition
| 1 | Technology | 17.4% |
| 2 | Financials | 12.04% |
| 3 | Consumer Discretionary | 10.17% |
| 4 | Healthcare | 8.63% |
| 5 | Industrials | 6.03% |
| Name | Market Value | Portfolio Weight | Shares or Principal |
Shares Change % | Capital Flow | |
|---|---|---|---|---|---|---|
901
Solid Power
SLDP
$667M
| $202K | ﹤0.01% |
+38,535
| New | +$202K |
|
902
New Fortress Energy
NFE
$387M
| $201K | ﹤0.01% |
4,611
+3,173
| +221% | +$138K |
|
|
RC
903
Ready Capital
RC
$675M
| $200K | ﹤0.01% |
19,746
-43,547
| -69% | -$441K |
|
|
SWN
904
DELISTED
Southwestern Energy Company
SWN
| $200K | ﹤0.01% |
32,822
-96,378
| -75% | -$587K |
|
905
Glaukos
GKOS
$5.02B
| $199K | ﹤0.01% |
3,738
+3,724
| +26,600% | +$198K |
|
906
iShares S&P GSCI Commodity-Indexed Trust
GSG
$992M
| $199K | ﹤0.01% |
9,707
-53,402
| -85% | -$1.09M |
|
907
Main Street Capital
MAIN
$6.01B
| $199K | ﹤0.01% |
+5,943
| New | +$199K |
|
|
BINI
908
Bollinger Innovations, Inc. Common Stock
BINI
$2.56M
| – | – |
0
| – | -$877K |
|
909
Avita Medical
RCEL
$113M
| $199K | ﹤0.01% |
37,811
-15,472
| -29% | -$81.4K |
|
910
Modine Manufacturing
MOD
$7.95B
| $198K | ﹤0.01% |
+15,319
| New | +$198K |
|
911
TETRA Technologies
TTI
$640M
| $198K | ﹤0.01% |
+55,404
| New | +$198K |
|
|
ARVL
912
DELISTED
Arrival Ordinary Shares
ARVL
| $198K | ﹤0.01% |
4,909
+4,745
| +2,893% | +$191K |
|
|
XYZ
913
Block, Inc.
XYZ
$45.2B
| $197K | ﹤0.01% |
3,600
-165,204
| -98% | -$9.04M |
|
|
NXDR
914
Nextdoor Holdings
NXDR
$771M
| $196K | ﹤0.01% |
70,381
-74,951
| -52% | -$209K |
|
915
Ardelyx
ARDX
$1.6B
| $195K | ﹤0.01% |
164,561
-299,383
| -65% | -$355K |
|
916
Oshkosh
OSK
$8.75B
| $195K | ﹤0.01% |
+2,781
| New | +$195K |
|
917
-1x Short VIX Futures ETF
SVIX
$196M
| $194K | ﹤0.01% |
18,878
+7,506
| +66% | +$77.1K |
|
918
TH International
THCH
$80.5M
| $194K | ﹤0.01% |
+6,492
| New | +$194K |
|
|
SVM
919
Silvercorp Metals
SVM
$1.13B
| $193K | ﹤0.01% |
83,174
+36,214
| +77% | +$84K |
|
920
Vanguard FTSE Europe ETF
VGK
$27.2B
| $193K | ﹤0.01% |
+4,199
| New | +$193K |
|
|
AVID
921
DELISTED
Avid Technology Inc
AVID
| $192K | ﹤0.01% |
8,283
+7,383
| +820% | +$171K |
|
922
Civitas Resources
CIVI
$3.13B
| $191K | ﹤0.01% |
+3,337
| New | +$191K |
|
923
Vanguard Russell 2000 ETF
VTWO
$12.9B
| $190K | ﹤0.01% |
+2,862
| New | +$190K |
|
|
WSR
924
Whitestone REIT
WSR
$656M
| $190K | ﹤0.01% |
22,467
+7,411
| +49% | +$62.7K |
|
|
AAWW
925
DELISTED
Atlas Air Worldwide Holdings, Inc.
AAWW
| $189K | ﹤0.01% |
1,987
-1,869
| -48% | -$178K |
|