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 | |
|---|---|---|---|---|---|---|
7101
PUT
CGI
GIB
$15B
| $26K | ﹤0.01% |
+300
| New | +$29K |
|
7102
CALL
GrowGeneration
GRWG
$88.3M
| $26K | ﹤0.01% |
14,100
+12,300
| +683% | +$16.9K |
|
7103
CALL
Kforce
KFRC
$1.04B
| $26K | ﹤0.01% |
+900
| New | +$31.9K |
|
7104
CALL
Oric Pharmaceuticals
ORIC
$1.23B
| $26K | ﹤0.01% |
2,200
-1,100
| -33% | -$11.6K |
|
7105
OraSure Technologies
OSUR
$277M
| $26K | ﹤0.01% |
8,203
-407
| -5% | -$1.28K |
|
7106
Purple Innovation
PRPL
$35.7M
| $26K | ﹤0.01% |
1,114
-50
| -4% | -$1.17K |
|
7107
ProShares UltraShort QQQ
QID
$293M
| $26K | ﹤0.01% |
+1,233
| New | +$29.3K |
|
7108
CALL
Quince Therapeutics
QNCX
$18.9M
| $26K | ﹤0.01% |
81
-68
| -46% | -$22.6K |
|
7109
PUT
Radware
RDWR
$1.19B
| $26K | ﹤0.01% |
1,000
| – | – |
|
7110
CALL
Ryman Hospitality Properties
RHP
$8.58B
| $26K | ﹤0.01% |
300
+200
| +200% | +$19.6K |
|
7111
CALL
Similarweb
SMWB
$630M
| $26K | ﹤0.01% |
2,900
-28,200
| -91% | -$252K |
|
7112
PUT
StepStone Group
STEP
$3.67B
| $26K | ﹤0.01% |
400
| – | – |
|
7113
PUT
Teekay
TK
$981M
| $26K | ﹤0.01% |
3,200
-900
| -22% | -$7.16K |
|
7114
Tilly's
TLYS
$118M
| $26K | ﹤0.01% |
12,766
+6,370
| +100% | +$11K |
|
|
YALA
7115
CALL
Yalla Group
YALA
$824M
| $26K | ﹤0.01% |
3,500
-6,300
| -64% | -$48.6K |
|
|
ROI
7116
CALL
DELISTED
WISDOMTREE LARGECAP GROWTH FUND
ROI
| $26K | ﹤0.01% |
300
+200
| +200% | +$17.3K |
|
7117
Alto Ingredients
ALTO
$345M
| $25K | ﹤0.01% |
23,459
+12,628
| +117% | +$14.2K |
|
7118
abrdn Bloomberg All Commodity Strategy K-1 Free ETF
BCI
$2.92B
| $25K | ﹤0.01% |
+1,200
| New | +$25.2K |
|
7119
Beam Global
BEEM
$23.1M
| $25K | ﹤0.01% |
8,737
+6,909
| +378% | +$16.8K |
|
7120
CALL
BioLife Solutions
BLFS
$1.56B
| $25K | ﹤0.01% |
1,000
+900
| +900% | +$21.4K |
|
7121
CALL
Grupo Cibest SA
CIB
$21.1B
| $25K | ﹤0.01% |
500
-800
| -62% | -$38.6K |
|
|
7122
Grupo Cibest SA
CIB
$21.1B
| $25K | ﹤0.01% |
485
-24,764
| -98% | -$1.2M |
|
7123
PUT
Caledonia Mining Corp
CMCL
$361M
| $25K | ﹤0.01% |
700
+600
| +600% | +$15.3K |
|
7124
Center Bancorp
CNOB
$1.66B
| $25K | ﹤0.01% |
+1,037
| New | +$25.6K |
|
7125
First Trust SkyBridge Crypto Industry and Digital Economy ETF
CRPT
$84M
| $25K | ﹤0.01% |
1,126
+930
| +474% | +$20.8K |
|
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.