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
| Rank | Stock | Value |
|---|---|---|
| 1 |
Microsoft
MSFT
|
+$234M |
| 2 |
iShares Russell 2000 ETF
IWM
|
+$97.5M |
| 3 |
Amazon
AMZN
|
+$96.8M |
| 4 |
iShares Bitcoin Trust
IBIT
|
+$80.6M |
| 5 |
Pinduoduo
PDD
|
+$54.9M |
Top Sells
| Rank | Stock | Value |
|---|---|---|
| 1 |
iShares 20+ Year Treasury Bond ETF
TLT
|
+$129M |
| 2 |
Alphabet (Google) Class A
GOOGL
|
+$92.9M |
| 3 |
Broadcom
AVGO
|
+$82.9M |
| 4 |
Alphabet (Google) Class C
GOOG
|
+$68.4M |
| 5 |
Meta Platforms (Facebook)
META
|
+$59.2M |
Sector Composition
| Rank | Sector | Weight |
|---|---|---|
| 1 | Technology | 0.79% |
| 2 | Consumer Discretionary | 0.3% |
| 3 | Healthcare | 0.25% |
| 4 | Financials | 0.17% |
| 5 | Industrials | 0.09% |
| Name | Market Value | Portfolio Weight | Shares or Principal |
Change in Stake | Capital Flow | |
|---|---|---|---|---|---|---|
5051
CALL
Coca-Cola Femsa
KOF
$22.9B
| $182K | ﹤0.01% |
2,200
+1,900
| +633% | +$164K |
|
5052
GraniteShares ETF Trust GraniteShares 2x Long NVDA Daily ETF
NVDL
$3.15B
| $182K | ﹤0.01% |
+5,862
| New | +$164K |
|
5053
PAR Technology
PAR
$695M
| $182K | ﹤0.01% |
4,619
-5,710
| -55% | -$315K |
|
5054
PUT
Procept Biorobotics
PRCT
$1.02B
| $182K | ﹤0.01% |
5,100
-700
| -12% | -$32K |
|
5055
Verastem
VSTM
$536M
| $182K | ﹤0.01% |
20,704
+18,207
| +729% | +$136K |
|
5056
PUT
Washington Trust Bancorp
WASH
$748M
| $182K | ﹤0.01% |
6,300
+1,400
| +29% | +$40.5K |
|
5057
Atour Lifestyle Holdings
ATAT
$4.66B
| $181K | ﹤0.01% |
4,829
+2,159
| +81% | +$78.9K |
|
5058
CALL
Enanta Pharmaceuticals
ENTA
$378M
| $181K | ﹤0.01% |
15,200
+13,900
| +1,069% | +$111K |
|
5059
PUT
GoPro
GPRO
$124M
| $181K | ﹤0.01% |
85,600
-248,900
| -74% | -$370K |
|
5060
CALL
Madison Square Garden
MSGS
$9.75B
| $181K | ﹤0.01% |
800
+500
| +167% | +$102K |
|
5061
Tenaya Therapeutics
TNYA
$163M
| $181K | ﹤0.01% |
111,932
+103,374
| +1,208% | +$104K |
|
|
TRML
5062
PUT
DELISTED
Tourmaline Bio
TRML
| $181K | ﹤0.01% |
3,800
+3,700
| +3,700% | +$103K |
|
|
WOW
5063
DELISTED
WideOpenWest
WOW
| $181K | ﹤0.01% |
35,166
+19,786
| +129% | +$88.7K |
|
|
NAGE
5064
PUT
Niagen Bioscience
NAGE
$264M
| $181K | ﹤0.01% |
19,500
+6,900
| +55% | +$69.7K |
|
5065
PUT
Clearwater Paper
CLW
$341M
| $180K | ﹤0.01% |
8,700
+8,400
| +2,800% | +$203K |
|
5066
Flotek Industries
FTK
$847M
| $180K | ﹤0.01% |
12,359
+10,895
| +744% | +$138K |
|
5067
CALL
Lexicon Pharmaceuticals
LXRX
$1.04B
| $180K | ﹤0.01% |
133,400
-120,700
| -48% | -$137K |
|
5068
PUT
Suburban Propane Partners
SPH
$1.23B
| $180K | ﹤0.01% |
9,700
+1,800
| +23% | +$33.2K |
|
5069
CALL
Trex
TREX
$4.56B
| $180K | ﹤0.01% |
3,500
-1,400
| -29% | -$85.3K |
|
|
DYNC
5070
Dynamix Corp
DYNC
$240M
| $180K | ﹤0.01% |
+17,329
| New | +$186K |
|
5071
Teucrium Sugar Fund
CANE
$73.9M
| $179K | ﹤0.01% |
16,980
+16,861
| +14,169% | +$182K |
|
5072
Federal Signal
FSS
$7.6B
| $179K | ﹤0.01% |
+1,506
| New | +$181K |
|
5073
Hamilton Insurance Group
HG
$3.54B
| $179K | ﹤0.01% |
7,250
-1,010
| -12% | -$23K |
|
5074
ICICI Bank
IBN
$109B
| $179K | ﹤0.01% |
+5,943
| New | +$194K |
|
5075
PUT
Independent Bank
INDB
$4.02B
| $179K | ﹤0.01% |
2,600
-300
| -10% | -$20.4K |
|
Similar funds
Simplex Trading's Q3 2025 Portfolio in Review
As of Q3 2025, Simplex Trading held 10,358 positions worth $195B, up 12% from $175B the previous quarter. Its ten largest holdings account for 46% of the portfolio.
Simplex Trading's Q3 2025 filing shows 1,743 new, 3,828 increased, 3,250 reduced and 1,308 closed positions. Its largest new stake was Microsoft: 458,309 shares worth $237M. The largest sale was iShares 20+ Year Treasury Bond ETF, an estimated $129M.
By sector, the portfolio is most concentrated in Technology at 0.79% of assets, up from 0.74% a quarter earlier, followed by Consumer Discretionary and Healthcare.
- Simplex Trading's largest Q3 2025 buy was Microsoft: 458,309 shares worth $237M.
- Simplex Trading added most to iShares Russell 2000 ETF in Q3 2025, an estimated $97.5M increase.
- Simplex Trading's biggest Q3 2025 reduction was Alphabet (Google) Class A, cutting an estimated $92.9M.
- Simplex Trading fully exited iShares 20+ Year Treasury Bond ETF in Q3 2025, selling an estimated $129M.
- Simplex Trading's ten largest holdings make up 46% of its $195B portfolio in Q3 2025.
- Simplex Trading opened 1,743 new positions and closed 1,308 in Q3 2025.
- Simplex Trading's portfolio value rose 12% quarter-over-quarter to $195B.
Based on Simplex Trading's 13F filing for Q3 2025, filed 12 Nov 2025.