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 | |
|---|---|---|---|---|---|---|
|
GOOS
3201
CALL
Canada Goose Holdings
GOOS
$891M
| $867K | ﹤0.01% |
62,900
-105,300
| -63% | -$1.37M |
|
3202
Meritage Homes
MTH
$4.89B
| $867K | ﹤0.01% |
11,975
+11,727
| +4,729% | +$871K |
|
|
BIOA
3203
PUT
BioAge Labs
BIOA
$928M
| $866K | ﹤0.01% |
147,300
+10,600
| +8% | +$49.6K |
|
|
CMBT
3204
CALL
CMB.TECH NV
CMBT
$4.46B
| $862K | ﹤0.01% |
91,900
+85,200
| +1,272% | +$780K |
|
3205
CALL
Insperity
NSP
$1.92B
| $861K | ﹤0.01% |
17,500
+17,400
| +17,400% | +$953K |
|
3206
PUT
Smith & Wesson
SWBI
$666M
| $861K | ﹤0.01% |
87,600
+16,700
| +24% | +$143K |
|
3207
Direxion Daily FTSE China Bear 3X ETF
YANG
$91.7M
| $861K | ﹤0.01% |
40,070
-7,710
| -16% | -$204K |
|
3208
PUT
Virtu Financial
VIRT
$5.12B
| $859K | ﹤0.01% |
24,200
+14,300
| +144% | +$588K |
|
|
AMRZ
3209
CALL
Amrize Ltd
AMRZ
$27.7B
| $858K | ﹤0.01% |
+17,700
| New | +$903K |
|
3210
CALL
Hycroft Mining Holding Corp
HYMC
$1.87B
| $856K | ﹤0.01% |
138,100
+17,900
| +15% | +$79.6K |
|
3211
PUT
Bio-Techne
TECH
$11.2B
| $856K | ﹤0.01% |
15,400
+4,300
| +39% | +$230K |
|
3212
PUT
Farmers National Banc Corp
FMNB
$909M
| $854K | ﹤0.01% |
+59,300
| New | +$850K |
|
3213
CALL
Arcturus Therapeutics
ARCT
$164M
| $853K | ﹤0.01% |
46,300
+25,000
| +117% | +$402K |
|
3214
CALL
Dominari Holdings
DOMH
$56.1M
| $853K | ﹤0.01% |
+120,400
| New | +$703K |
|
3215
CALL
Coty
COTY
$2.39B
| $852K | ﹤0.01% |
211,100
+154,600
| +274% | +$708K |
|
3216
Enphase Energy
ENPH
$5.01B
| $852K | ﹤0.01% |
24,090
+3,677
| +18% | +$137K |
|
3217
Check Point Software Technologies
CHKP
$13.6B
| $850K | ﹤0.01% |
+4,109
| New | +$828K |
|
3218
CALL
Natural Resource Partners
NRP
$1.3B
| $850K | ﹤0.01% |
8,100
+1,200
| +17% | +$122K |
|
3219
Porch Group
PRCH
$1.39B
| $849K | ﹤0.01% |
+50,631
| New | +$777K |
|
3220
Remitly
RELY
$4.77B
| $849K | ﹤0.01% |
52,147
-53,155
| -50% | -$954K |
|
|
SUPV
3221
CALL
Grupo Supervielle
SUPV
$857M
| $849K | ﹤0.01% |
171,600
+138,300
| +415% | +$1.21M |
|
3222
PUT
ODDITY Tech
ODD
$758M
| $847K | ﹤0.01% |
13,600
-2,600
| -16% | -$169K |
|
3223
CALL
CVR Energy
CVI
$3.43B
| $846K | ﹤0.01% |
23,200
+4,400
| +23% | +$132K |
|
3224
PUT
Blue Owl Capital
OBDC
$5.42B
| $844K | ﹤0.01% |
66,100
+50,700
| +329% | +$722K |
|
3225
CALL
Village Farms International
VFF
$247M
| $844K | ﹤0.01% |
269,700
+227,100
| +533% | +$493K |
|
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.