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 | |
|---|---|---|---|---|---|---|
|
DMC
6251
Del Monte Corp
DMC
$1.41B
| $61K | ﹤0.01% |
1,780
+1,519
| +582% | +$53.8K |
|
6252
Microbot Medical
MBOT
$117M
| $61K | ﹤0.01% |
+20,089
| New | +$62.7K |
|
|
NTST
6253
NETSTREIT Corp
NTST
$2.1B
| $61K | ﹤0.01% |
+3,428
| New | +$62K |
|
6254
OneWater Marine
ONEW
$206M
| $61K | ﹤0.01% |
3,853
+3,834
| +20,179% | +$60.6K |
|
6255
CALL
PepGen
PEPG
$123M
| $61K | ﹤0.01% |
+13,300
| New | +$21.4K |
|
6256
Paysafe
PSFE
$434M
| $61K | ﹤0.01% |
4,797
-4,621
| -49% | -$61.8K |
|
6257
PUT
PSQ Holdings
PSQH
$13.9M
| $61K | ﹤0.01% |
2,153
-1,174
| -35% | -$35.8K |
|
6258
Reliance Steel & Aluminium
RS
$20.5B
| $61K | ﹤0.01% |
220
-7
| -3% | -$2.1K |
|
6259
CALL
Ryan Specialty Holdings
RYAN
$5.71B
| $61K | ﹤0.01% |
1,100
| – | – |
|
|
SLI
6260
PUT
Standard Lithium
SLI
$505M
| $61K | ﹤0.01% |
18,300
-53,600
| -75% | -$150K |
|
6261
PUT
1st Source
SRCE
$2.16B
| $61K | ﹤0.01% |
+1,000
| New | +$62.7K |
|
|
TRON
6262
PUT
Tron Inc
TRON
$702M
| $61K | ﹤0.01% |
31,700
+20,100
| +173% | +$119K |
|
6263
PUT
Synaptics
SYNA
$4.25B
| $61K | ﹤0.01% |
900
-700
| -44% | -$47.6K |
|
6264
CALL
Terex
TEX
$7.11B
| $61K | ﹤0.01% |
1,200
-4,800
| -80% | -$244K |
|
6265
CALL
Teleflex
TFX
$5.86B
| $61K | ﹤0.01% |
500
-1,100
| -69% | -$133K |
|
|
BTGD
6266
STKd 100% Bitcoin & 100% Gold ETF
BTGD
$42.4M
| $61K | ﹤0.01% |
+1,441
| New | +$56.7K |
|
|
LUCK
6267
CALL
Lucky Strike Entertainment
LUCK
$959M
| $61K | ﹤0.01% |
6,000
+1,600
| +36% | +$16.1K |
|
6268
CALL
Apogee Enterprises
APOG
$832M
| $60K | ﹤0.01% |
1,400
+1,300
| +1,300% | +$55.8K |
|
6269
Blue Bird Corp
BLBD
$2.36B
| $60K | ﹤0.01% |
+1,059
| New | +$55.3K |
|
6270
GH Research
GHRS
$1.95B
| $60K | ﹤0.01% |
4,209
+4,184
| +16,736% | +$58.5K |
|
6271
CALL
Gogo Inc
GOGO
$559M
| $60K | ﹤0.01% |
7,000
-3,600
| -34% | -$45.6K |
|
6272
CALL
KNOT Offshore Partners
KNOP
$358M
| $60K | ﹤0.01% |
6,900
+6,600
| +2,200% | +$50.5K |
|
6273
PUT
MGP Ingredients
MGPI
$380M
| $60K | ﹤0.01% |
2,500
+600
| +32% | +$17.4K |
|
6274
CALL
Napco Security Technologies
NSSC
$1.3B
| $60K | ﹤0.01% |
1,400
-200
| -13% | -$6.94K |
|
|
OPI
6275
PUT
DELISTED
Office Properties Income Trust
OPI
| $60K | ﹤0.01% |
+87,800
| New | +$26K |
|
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.