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 | |
|---|---|---|---|---|---|---|
6351
PUT
Hooker Furnishings Corp
HOFT
$147M
| $55K | ﹤0.01% |
+5,500
| New | +$57.4K |
|
6352
PUT
MarineMax
HZO
$748M
| $55K | ﹤0.01% |
2,200
+1,600
| +267% | +$40.8K |
|
|
TBHC
6353
DELISTED
The Brand House Collective
TBHC
| $55K | ﹤0.01% |
33,971
+22,654
| +200% | +$34.4K |
|
6354
CALL
LCI Industries
LCII
$2.59B
| $55K | ﹤0.01% |
600
-22,700
| -97% | -$2.27M |
|
6355
CALL
Peapack-Gladstone Financial
PGC
$815M
| $55K | ﹤0.01% |
+2,000
| New | +$56.1K |
|
6356
CALL
Progyny
PGNY
$2.46B
| $55K | ﹤0.01% |
2,600
-5,700
| -69% | -$130K |
|
6357
PUT
Pentair
PNR
$10.6B
| $55K | ﹤0.01% |
500
+300
| +150% | +$32K |
|
6358
Talkspace
TALK
$874M
| $55K | ﹤0.01% |
20,159
-30,910
| -61% | -$80.1K |
|
6359
Vuzix
VUZI
$178M
| $55K | ﹤0.01% |
17,859
-30,420
| -63% | -$71.8K |
|
6360
iPath Series B S&P 500 VIX Mid-Term Futures ETN
VXZ
$31.6M
| $55K | ﹤0.01% |
1,001
-1,113
| -53% | -$64.1K |
|
6361
CALL
NCR Voyix
VYX
$1.19B
| $55K | ﹤0.01% |
4,400
+2,000
| +83% | +$26.4K |
|
6362
CALL
Watts Water Technologies
WTS
$11.2B
| $55K | ﹤0.01% |
200
-100
| -33% | -$26.8K |
|
|
LLYX
6363
Defiance Daily Target 2x Long LLY ETF
LLYX
$60.6M
| $55K | ﹤0.01% |
3,978
+1,083
| +37% | +$15K |
|
|
ARX
6364
CALL
Accelerant Holdings
ARX
$2.71B
| $55K | ﹤0.01% |
+3,700
| New | +$86.7K |
|
6365
Atlas Energy Solutions
AESI
$1.27B
| $54K | ﹤0.01% |
4,829
-58,218
| -92% | -$713K |
|
6366
CALL
Arena Group
AREN
$55.2M
| $54K | ﹤0.01% |
10,000
+2,800
| +39% | +$17.4K |
|
6367
Atlas Lithium Corp
ATLX
$75.5M
| $54K | ﹤0.01% |
11,390
+6,354
| +126% | +$31.4K |
|
6368
PUT
Astronics
ATRO
$3.21B
| $54K | ﹤0.01% |
+1,440
| New | +$43.8K |
|
6369
CALL
Bioventus
BVS
$889M
| $54K | ﹤0.01% |
+8,100
| New | +$56.2K |
|
6370
Camden National
CAC
$988M
| $54K | ﹤0.01% |
+1,401
| New | +$56.3K |
|
6371
Invesco S&P 100 Equal Weight ETF
EQWL
$2.69B
| $54K | ﹤0.01% |
473
+407
| +617% | +$45.6K |
|
6372
CALL
Home Bancorp
HBCP
$558M
| $54K | ﹤0.01% |
+1,000
| New | +$54.8K |
|
|
HITI
6373
CALL
High Tide
HITI
$180M
| $54K | ﹤0.01% |
15,000
-305,500
| -95% | -$884K |
|
6374
PUT
Inter&Co
INTR
$2.39B
| $54K | ﹤0.01% |
5,900
-2,100
| -26% | -$16.5K |
|
6375
PUT
Merchants Bancorp
MBIN
$2.49B
| $54K | ﹤0.01% |
1,700
+1,600
| +1,600% | +$52.5K |
|
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.