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 |
Boeing
BA
|
+$49.5M |
| 2 |
Pinduoduo
PDD
|
+$45.3M |
| 3 |
Microsoft
MSFT
|
+$42.5M |
| 4 |
Apple
AAPL
|
+$33.3M |
| 5 |
Direxion Daily Semiconductor Bull 3X Shares
SOXL
|
+$25.4M |
Top Sells
| 1 |
Broadcom
AVGO
|
+$95.4M |
| 2 |
Citigroup
C
|
+$57.9M |
| 3 |
Pfizer
PFE
|
+$55.9M |
| 4 |
TSMC
TSM
|
+$40.4M |
| 5 |
Starbucks
SBUX
|
+$40.4M |
Sector Composition
| 1 | Technology | 23.11% |
| 2 | Consumer Discretionary | 16.53% |
| 3 | Healthcare | 8.58% |
| 4 | Industrials | 7.58% |
| 5 | Financials | 7.29% |
| Name | Market Value | Portfolio Weight | Shares or Principal |
Shares Change % | Capital Flow | |
|---|---|---|---|---|---|---|
551
Exact Sciences
EXAS
$10.4B
| $636K | ﹤0.01% |
9,340
-14,040
| -60% | -$956K |
|
552
ProShares Ultra S&P500
SSO
$7.29B
| $636K | ﹤0.01% |
7,062
+6,503
| +1,163% | +$586K |
|
553
TripAdvisor
TRIP
$2.06B
| $633K | ﹤0.01% |
+43,733
| New | +$633K |
|
554
iShares 3-7 Year Treasury Bond ETF
IEI
$16.9B
| $632K | ﹤0.01% |
5,290
-5,667
| -52% | -$677K |
|
555
Builders FirstSource
BLDR
$15.5B
| $631K | ﹤0.01% |
3,257
+1,792
| +122% | +$347K |
|
556
Aflac
AFL
$57.3B
| $630K | ﹤0.01% |
5,639
+5,446
| +2,822% | +$608K |
|
557
Global X Copper Miners ETF NEW
COPX
$2.17B
| $627K | ﹤0.01% |
13,276
+2,192
| +20% | +$104K |
|
558
Charles River Laboratories
CRL
$7.54B
| $624K | ﹤0.01% |
+3,169
| New | +$624K |
|
559
Repligen
RGEN
$6.76B
| $618K | ﹤0.01% |
4,157
-2,864
| -41% | -$426K |
|
560
TORM
TRMD
$2.21B
| $616K | ﹤0.01% |
+18,017
| New | +$616K |
|
561
DTE Energy
DTE
$28.2B
| $614K | ﹤0.01% |
+4,785
| New | +$614K |
|
562
Ramaco Resources Class A
METC
$1.72B
| $614K | ﹤0.01% |
54,245
+21,268
| +64% | +$241K |
|
563
Comfort Systems
FIX
$26.5B
| $608K | ﹤0.01% |
1,560
+373
| +31% | +$145K |
|
564
Nabors Industries
NBR
$619M
| $608K | ﹤0.01% |
9,434
+8,736
| +1,252% | +$563K |
|
565
Royal Gold
RGLD
$12.3B
| $607K | ﹤0.01% |
4,327
-20,594
| -83% | -$2.89M |
|
|
ALTM
566
DELISTED
Arcadium Lithium plc
ALTM
| $607K | ﹤0.01% |
213,041
+155,244
| +269% | +$442K |
|
567
Douglas Emmett
DEI
$2.75B
| $604K | ﹤0.01% |
34,396
+15,344
| +81% | +$269K |
|
568
Dominion Energy
D
$50.7B
| $600K | ﹤0.01% |
+10,399
| New | +$600K |
|
569
Target Hospitality
TH
$876M
| $600K | ﹤0.01% |
77,172
+8,450
| +12% | +$65.7K |
|
|
NNDM
570
Nano Dimension
NNDM
$311M
| $599K | ﹤0.01% |
244,776
+87,913
| +56% | +$215K |
|
571
Global X Cybersecurity ETF
BUG
$1.12B
| $595K | ﹤0.01% |
19,233
+15,460
| +410% | +$478K |
|
572
Calumet Specialty Products
CLMT
$1.53B
| $593K | ﹤0.01% |
33,324
-93,614
| -74% | -$1.67M |
|
573
Extra Space Storage
EXR
$30.8B
| $593K | ﹤0.01% |
+3,291
| New | +$593K |
|
574
iShares Russell 2000 Value ETF
IWN
$11.8B
| $593K | ﹤0.01% |
3,560
-11,970
| -77% | -$1.99M |
|
575
iShares MSCI South Korea ETF
EWY
$5.38B
| $591K | ﹤0.01% |
9,255
-10,272
| -53% | -$656K |
|