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 | |
|---|---|---|---|---|---|---|
5426
Milestone Pharmaceuticals
MIST
$138M
| $133K | ﹤0.01% |
+66,920
| New | +$118K |
|
|
CALY
5427
PUT
Callaway Golf Company
CALY
$3.32B
| $133K | ﹤0.01% |
14,100
-11,800
| -46% | -$110K |
|
5428
Nurix Therapeutics
NRIX
$2.41B
| $133K | ﹤0.01% |
+14,445
| New | +$150K |
|
|
PINC
5429
CALL
DELISTED
Premier
PINC
| $133K | ﹤0.01% |
4,800
+3,400
| +243% | +$82.1K |
|
5430
PUT
TaskUs
TASK
$556M
| $133K | ﹤0.01% |
7,500
+6,200
| +477% | +$107K |
|
5431
PUT
US Gold Corp
USAU
$214M
| $133K | ﹤0.01% |
8,100
+2,100
| +35% | +$26.8K |
|
5432
PUT
John Wiley & Sons Class A
WLY
$2.65B
| $133K | ﹤0.01% |
3,300
+3,000
| +1,000% | +$121K |
|
|
ARDT
5433
CALL
Ardent Health
ARDT
$1.53B
| $133K | ﹤0.01% |
10,100
+2,000
| +25% | +$25K |
|
5434
CALL
Ambev
ABEV
$48.1B
| $132K | ﹤0.01% |
59,300
-8,500
| -13% | -$19.4K |
|
5435
CALL
American Coastal Insurance
ACIC
$515M
| $132K | ﹤0.01% |
11,600
-11,800
| -50% | -$128K |
|
|
BDN
5436
PUT
Brandywine Realty Trust
BDN
$524M
| $132K | ﹤0.01% |
31,800
+24,200
| +318% | +$102K |
|
5437
CALL
GoodRx Holdings
GDRX
$1.04B
| $132K | ﹤0.01% |
31,300
+19,500
| +165% | +$85.7K |
|
5438
iShares Latin America 40 ETF
ILF
$3.85B
| $132K | ﹤0.01% |
4,581
-2,698
| -37% | -$71.7K |
|
|
ACH
5439
CALL
Accendra Health
ACH
$237M
| $132K | ﹤0.01% |
27,500
+17,200
| +167% | +$109K |
|
5440
Shopify
SHOP
$152B
| $132K | ﹤0.01% |
+894
| New | +$121K |
|
5441
Capital Bancorp
CBNK
$608M
| $131K | ﹤0.01% |
4,114
-4,316
| -51% | -$144K |
|
5442
Choice Hotels
CHH
$5.07B
| $131K | ﹤0.01% |
+1,232
| New | +$150K |
|
5443
PUT
Carlisle Companies
CSL
$14.3B
| $131K | ﹤0.01% |
+400
| New | +$152K |
|
5444
CVRx
CVRX
$137M
| $131K | ﹤0.01% |
16,344
+531
| +3% | +$3.99K |
|
5445
PUT
Jazz Pharmaceuticals
JAZZ
$15.9B
| $131K | ﹤0.01% |
1,000
+200
| +25% | +$24K |
|
5446
PUT
Playtika
PLTK
$1.52B
| $131K | ﹤0.01% |
33,700
-8,100
| -19% | -$33.1K |
|
5447
CALL
Zura Bio
ZURA
$516M
| $131K | ﹤0.01% |
+30,300
| New | +$54.5K |
|
|
TSLG
5448
Leverage Shares 2X Long TSLA Daily ETF
TSLG
$22.1M
| $131K | ﹤0.01% |
12,431
+11,706
| +1,615% | +$79.1K |
|
5449
PUT
Amylyx Pharmaceuticals
AMLX
$2.26B
| $130K | ﹤0.01% |
9,600
+8,000
| +500% | +$75.3K |
|
|
DX
5450
CALL
Dynex Capital
DX
$3.15B
| $130K | ﹤0.01% |
10,600
-5,400
| -34% | -$67.6K |
|
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.