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 | |
|---|---|---|---|---|---|---|
6151
PUT
eHealth
EHTH
$43.8M
| $67K | ﹤0.01% |
+15,700
| New | +$60.3K |
|
6152
CALL
Evercore
EVR
$12.1B
| $67K | ﹤0.01% |
200
-3,100
| -94% | -$971K |
|
6153
Jakks Pacific
JAKK
$302M
| $67K | ﹤0.01% |
+3,626
| New | +$66.6K |
|
6154
CALL
Madison Square Garden
MSGE
$3.73B
| $67K | ﹤0.01% |
1,500
-1,300
| -46% | -$52.7K |
|
|
NEWP
6155
CALL
New Pacific Metals
NEWP
$881M
| $67K | ﹤0.01% |
24,800
+19,400
| +359% | +$36K |
|
6156
SEACOR Marine Holdings
SMHI
$258M
| $67K | ﹤0.01% |
+10,359
| New | +$62.8K |
|
6157
CALL
Tonix Pharmaceuticals
TNXP
$161M
| $67K | ﹤0.01% |
+2,800
| New | +$104K |
|
6158
Vanguard Tax-Exempt Bond Index Fund
VTEB
$45.2B
| $67K | ﹤0.01% |
1,346
-5,324
| -80% | -$262K |
|
|
WIMI
6159
CALL
WiMi Hologram Cloud
WIMI
$22.2M
| $67K | ﹤0.01% |
14,900
-40,100
| -73% | -$156K |
|
6160
CALL
Amtech Systems
ASYS
$259M
| $66K | ﹤0.01% |
7,200
+6,000
| +500% | +$36.7K |
|
6161
PUT
Atlas Lithium Corp
ATLX
$80.2M
| $66K | ﹤0.01% |
13,900
-6,100
| -31% | -$30.1K |
|
6162
CareDx
CDNA
$1.97B
| $66K | ﹤0.01% |
+4,587
| New | +$65.4K |
|
6163
CALL
Clean Energy Fuels
CLNE
$425M
| $66K | ﹤0.01% |
25,700
-1,800
| -7% | -$4.21K |
|
6164
CALL
Daktronics
DAKT
$941M
| $66K | ﹤0.01% |
3,200
+2,200
| +220% | +$39.5K |
|
6165
CALL
Equity Lifestyle Properties
ELS
$12.7B
| $66K | ﹤0.01% |
1,100
+400
| +57% | +$24.3K |
|
6166
CALL
Fidus Investment
FDUS
$755M
| $66K | ﹤0.01% |
3,300
+3,200
| +3,200% | +$67.5K |
|
6167
ProPetro Holding
PUMP
$1.33B
| $66K | ﹤0.01% |
12,614
+9,465
| +301% | +$50.2K |
|
6168
Roper Technologies
ROP
$38.5B
| $66K | ﹤0.01% |
134
-24
| -15% | -$12.8K |
|
6169
PUT
Schrodinger
SDGR
$1.15B
| $66K | ﹤0.01% |
3,300
-300
| -8% | -$6.03K |
|
6170
CALL
iShares 0-5 Year Investment Grade Corporate Bond ETF
SLQD
$2.37B
| $66K | ﹤0.01% |
1,200
+300
| +33% | +$15.2K |
|
6171
Teradata
TDC
$2.88B
| $66K | ﹤0.01% |
+3,108
| New | +$66.9K |
|
|
TMHC
6172
CALL
DELISTED
Taylor Morrison
TMHC
| $66K | ﹤0.01% |
+1,000
| New | +$65.8K |
|
|
TMHC
6173
PUT
DELISTED
Taylor Morrison
TMHC
| $66K | ﹤0.01% |
1,000
-20,900
| -95% | -$1.38M |
|
6174
iShares MSCI World ETF
URTH
$7.98B
| $66K | ﹤0.01% |
364
-1,633
| -82% | -$285K |
|
|
LMBO
6175
DELISTED
Direxion Daily Crypto Industry Bull 2X ETF
LMBO
| $66K | ﹤0.01% |
1,823
-695
| -28% | -$19.9K |
|
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.