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 | |
|---|---|---|---|---|---|---|
226
CALL
United Parcel Service
UPS
$98.5B
| $86.5M | 0.04% |
1,035,700
+320,100
| +45% | +$29M |
|
227
PUT
Merck
MRK
$315B
| $86.3M | 0.04% |
1,028,700
+38,700
| +4% | +$3.19M |
|
228
CALL
Johnson & Johnson
JNJ
$615B
| $86.2M | 0.04% |
465,100
-10,400
| -2% | -$1.78M |
|
229
CALL
Caterpillar
CAT
$410B
| $85.4M | 0.04% |
179,000
+52,800
| +42% | +$22.5M |
|
230
PUT
First Solar
FSLR
$22.4B
| $85.1M | 0.04% |
385,900
-63,000
| -14% | -$12.1M |
|
231
CALL
MP Materials
MP
$8.13B
| $84.9M | 0.04% |
1,266,400
+244,300
| +24% | +$15.4M |
|
232
CALL
Starbucks
SBUX
$119B
| $84.2M | 0.04% |
995,200
-164,500
| -14% | -$14.7M |
|
233
PUT
Celestica
CLS
$38.6B
| $84.2M | 0.04% |
341,700
+273,100
| +398% | +$55.1M |
|
234
PUT
Riot Platforms
RIOT
$8.84B
| $83.5M | 0.04% |
4,386,200
+2,392,800
| +120% | +$33.1M |
|
235
PUT
Arista Networks
ANET
$220B
| $82.5M | 0.04% |
629,600
-209,500
| -25% | -$27M |
|
236
CALL
MongoDB
MDB
$24.5B
| $82.3M | 0.04% |
265,200
+39,800
| +18% | +$10.2M |
|
237
CALL
Astera Labs
ALAB
$56.7B
| $82M | 0.04% |
418,700
+93,200
| +29% | +$15.3M |
|
238
CALL
PepsiCo
PEP
$185B
| $81.5M | 0.04% |
580,500
-394,800
| -40% | -$56.4M |
|
239
PUT
Constellation Energy
CEG
$98.2B
| $81.2M | 0.04% |
246,700
-106,200
| -30% | -$34.3M |
|
240
PUT
Texas Instruments
TXN
$268B
| $80.8M | 0.04% |
439,900
+233,600
| +113% | +$45.7M |
|
241
CALL
Energy Transfer Partners
ET
$70.1B
| $80.3M | 0.04% |
4,680,600
+1,677,900
| +56% | +$29.4M |
|
242
CALL
Synopsys
SNPS
$72.3B
| $79.1M | 0.04% |
160,300
+130,400
| +436% | +$73.7M |
|
243
PUT
Western Digital
WDC
$192B
| $78.9M | 0.04% |
799,700
+324,800
| +68% | +$26.5M |
|
244
CALL
Hims & Hers Health
HIMS
$7.33B
| $78.8M | 0.04% |
1,388,600
-230,600
| -14% | -$11.8M |
|
|
245
PUT
MongoDB
MDB
$24.5B
| $78.7M | 0.04% |
253,600
-61,200
| -19% | -$15.7M |
|
246
PUT
Lam Research
LRCX
$399B
| $78.4M | 0.04% |
585,500
-423,700
| -42% | -$44.9M |
|
247
CALL
United Airlines
UAL
$38.1B
| $77.4M | 0.04% |
801,700
-69,200
| -8% | -$6.66M |
|
248
CALL
Xtrackers MSCI Emerging Markets Hedged Equity ETF
DBEM
$108M
| $77.2M | 0.04% |
2,340,000
+228,600
| +11% | +$6.6M |
|
249
CALL
NIO
NIO
$11.7B
| $77M | 0.04% |
10,103,200
+2,954,500
| +41% | +$15.9M |
|
|
B
250
CALL
Barrick Mining
B
$62.8B
| $76.6M | 0.04% |
2,338,900
+218,100
| +10% | +$5.53M |
|
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.