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 | |
|---|---|---|---|---|---|---|
176
PUT
PayPal
PYPL
$49B
| $105M | 0.05% |
1,707,800
+369,300
| +28% | +$26M |
|
177
CALL
Occidental Petroleum
OXY
$57.2B
| $105M | 0.05% |
2,214,100
-178,600
| -7% | -$8.07M |
|
178
PUT
Carnival Corporation Ltd
CCL
$35.7B
| $103M | 0.05% |
3,564,700
+1,188,800
| +50% | +$35.9M |
|
179
State Street SPDR S&P 500 ETF Trust
SPY
$787B
| $103M | 0.05% |
154,283
+54,154
| +54% | +$34.7M |
|
180
CALL
Booking.com
BKNG
$138B
| $103M | 0.05% |
475,000
-667,500
| -58% | -$149M |
|
|
181
Amazon
AMZN
$2.63T
| $102M | 0.05% |
466,774
+427,796
| +1,098% | +$96.8M |
|
182
PUT
iShares MSCI Australia ETF
EWA
$1.35B
| $102M | 0.05% |
2,914,300
-744,000
| -20% | -$19.9M |
|
183
PUT
Direxion Daily S&P Oil & Gas Exp. & Prod. Bull 2X ETF
GUSH
$254M
| $102M | 0.05% |
3,557,900
+962,300
| +37% | +$22.8M |
|
184
PUT
Walt Disney
DIS
$166B
| $102M | 0.05% |
988,600
-112,000
| -10% | -$13.2M |
|
185
CALL
Dell
DELL
$285B
| $102M | 0.05% |
833,600
+321,300
| +63% | +$41.7M |
|
186
PUT
Pfizer
PFE
$142B
| $101M | 0.05% |
3,981,500
-42,900
| -1% | -$1.06M |
|
187
PUT
Freeport-McMoran
FCX
$93.4B
| $101M | 0.05% |
2,584,900
+409,900
| +19% | +$17.8M |
|
188
CALL
Vertiv
VRT
$116B
| $101M | 0.05% |
668,200
-347,400
| -34% | -$46.3M |
|
189
CALL
Marathon Digital Holdings
MARA
$4.73B
| $100M | 0.05% |
5,477,900
+2,960,600
| +118% | +$49.9M |
|
|
190
CALL
Carnival Corporation Ltd
CCL
$35.7B
| $99.5M | 0.05% |
3,443,400
+537,800
| +19% | +$16.2M |
|
191
PUT
IBM
IBM
$194B
| $99.4M | 0.05% |
392,500
-237,800
| -38% | -$62.2M |
|
|
192
iShares Bitcoin Trust
IBIT
$48.4B
| $99.4M | 0.05% |
1,528,615
+1,239,047
| +428% | +$80.6M |
|
193
CALL
Bloom Energy
BE
$62.1B
| $98.2M | 0.05% |
1,405,800
+892,600
| +174% | +$41.5M |
|
194
PUT
JD.com
JD
$40.7B
| $98.1M | 0.05% |
2,803,300
+975,600
| +53% | +$31.8M |
|
195
CALL
Warner Bros
WBD
$64.8B
| $97.3M | 0.05% |
4,981,300
+1,928,500
| +63% | +$26.3M |
|
196
PUT
Applied Materials
AMAT
$440B
| $97.1M | 0.05% |
474,200
+199,600
| +73% | +$36.2M |
|
197
Intel
INTC
$516B
| $94.9M | 0.05% |
2,829,604
+388,152
| +16% | +$9.4M |
|
198
CALL
Roblox
RBLX
$35.5B
| $94.9M | 0.05% |
684,800
-271,700
| -28% | -$33.8M |
|
199
CALL
First Solar
FSLR
$22.4B
| $94.3M | 0.05% |
427,600
-671,200
| -61% | -$129M |
|
200
CALL
Coca-Cola
KO
$354B
| $94M | 0.05% |
1,417,700
+510,600
| +56% | +$35.1M |
|
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.