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 | Miscellaneous | 98.09% |
| 2 | Technology | 0.79% |
| 3 | Consumer Discretionary | 0.3% |
| 4 | Healthcare | 0.25% |
| 5 | Financials | 0.17% |
| Name | Market Value | Portfolio Weight | Shares or Principal |
Change in Stake | Capital Flow | |
|---|---|---|---|---|---|---|
1351
PUT
MPLX
MPLX
$60.3B
| $5.71M | ﹤0.01% |
114,300
+10,600
| +10% | +$538K |
|
1352
CALL
SharkNinja
SN
$25.3B
| $5.67M | ﹤0.01% |
55,000
+35,300
| +179% | +$4.03M |
|
|
TSSI
1353
PUT
TSS Inc
TSSI
$244M
| $5.67M | ﹤0.01% |
313,000
+275,900
| +744% | +$5.51M |
|
1354
CALL
Trip.com Group
TCOM
$25.7B
| $5.66M | ﹤0.01% |
75,300
-15,500
| -17% | -$1.04M |
|
1355
Energy Transfer Partners
ET
$73.8B
| $5.66M | ﹤0.01% |
329,885
-721,755
| -69% | -$12.7M |
|
1356
CALL
Cinemark Holdings
CNK
$4.03B
| $5.65M | ﹤0.01% |
201,800
-22,200
| -10% | -$613K |
|
|
CMA
1357
PUT
DELISTED
Comerica
CMA
| $5.65M | ﹤0.01% |
82,500
-24,600
| -23% | -$1.66M |
|
1358
CALL
Five Below
FIVE
$13.6B
| $5.63M | ﹤0.01% |
36,400
-12,300
| -25% | -$1.74M |
|
|
METD
1359
PUT
Direxion Daily META Bear 1X ETF
METD
$8.56M
| $5.63M | ﹤0.01% |
147,100
+28,300
| +24% | +$409K |
|
1360
PUT
AES
AES
$10.6B
| $5.62M | ﹤0.01% |
427,300
-313,000
| -42% | -$4.07M |
|
1361
BorgWarner
BWA
$13.6B
| $5.62M | ﹤0.01% |
127,853
+69,561
| +119% | +$2.78M |
|
1362
PUT
TG Therapeutics
TGTX
$8.52B
| $5.62M | ﹤0.01% |
155,500
+32,900
| +27% | +$1.08M |
|
1363
Starbucks
SBUX
$118B
| $5.61M | ﹤0.01% |
+66,264
| New | +$5.93M |
|
1364
PUT
Evolv Technologies
EVLV
$916M
| $5.6M | ﹤0.01% |
742,300
+306,300
| +70% | +$2.24M |
|
1365
CALL
S&P Global
SPGI
$128B
| $5.6M | ﹤0.01% |
11,500
-11,900
| -51% | -$6.37M |
|
1366
CALL
Royal Gold
RGLD
$22.3B
| $5.6M | ﹤0.01% |
27,900
+11,200
| +67% | +$1.94M |
|
|
VISN
1367
PUT
Vistance Networks Inc
VISN
$1.49B
| $5.59M | ﹤0.01% |
361,300
-195,400
| -35% | -$2.54M |
|
1368
PUT
Chubb
CB
$131B
| $5.59M | ﹤0.01% |
19,800
-10,800
| -35% | -$2.97M |
|
1369
CALL
Core & Main
CNM
$8.16B
| $5.59M | ﹤0.01% |
103,800
+64,600
| +165% | +$3.91M |
|
1370
Applied Digital
APLD
$8.06B
| $5.57M | ﹤0.01% |
242,800
-101,661
| -30% | -$1.51M |
|
1371
CALL
ZIM Integrated Shipping Services
ZIM
$3.58B
| $5.56M | ﹤0.01% |
410,300
-49,500
| -11% | -$751K |
|
1372
CALL
Rockwell Automation
ROK
$47.8B
| $5.56M | ﹤0.01% |
15,900
-600
| -4% | -$207K |
|
|
GPGI
1373
GPGI Inc
GPGI
$4.02B
| $5.55M | ﹤0.01% |
+266,485
| New | +$4.61M |
|
|
1374
AES
AES
$10.6B
| $5.53M | ﹤0.01% |
419,971
-140,605
| -25% | -$1.83M |
|
1375
PUT
Upexi
UPXI
$75.7M
| $5.52M | ﹤0.01% |
956,200
+848,800
| +790% | +$5.16M |
|
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, 3,249 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 Miscellaneous at 98% of assets, down from 98% a quarter earlier, followed by Technology and Consumer Discretionary.
- 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.