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 | |
|---|---|---|---|---|---|---|
|
TVRD
3476
CALL
Tvardi Therapeutics
TVRD
$23.5M
| $674K | ﹤0.01% |
+17,300
| New | +$493K |
|
3477
CALL
Compass Diversified
CODI
$774M
| $673K | ﹤0.01% |
101,800
+5,000
| +5% | +$34.5K |
|
3478
PUT
Acadia Pharmaceuticals
ACAD
$4.44B
| $672K | ﹤0.01% |
31,500
+20,700
| +192% | +$490K |
|
3479
PUT
United States Copper Index Fund
CPER
$743M
| $672K | ﹤0.01% |
22,400
+5,900
| +36% | +$178K |
|
3480
CALL
Krispy Kreme
DNUT
$562M
| $672K | ﹤0.01% |
173,800
+23,700
| +16% | +$81.7K |
|
|
EXK
3481
PUT
Endeavour Silver
EXK
$2.29B
| $671K | ﹤0.01% |
85,700
-28,800
| -25% | -$170K |
|
|
ETHU
3482
2x Ether ETF
ETHU
$756M
| $671K | ﹤0.01% |
5,172
+4,383
| +556% | +$557K |
|
|
LENZ
3483
PUT
LENZ Therapeutics
LENZ
$184M
| $670K | ﹤0.01% |
+14,400
| New | +$530K |
|
|
KYIV
3484
Kyivstar Group
KYIV
$3.13B
| $670K | ﹤0.01% |
+53,670
| New | +$637K |
|
3485
PUT
Bentley Systems
BSY
$10.8B
| $669K | ﹤0.01% |
13,000
-500
| -4% | -$27.4K |
|
3486
CALL
BTCS Inc
BTCS
$51.8M
| $669K | ﹤0.01% |
+138,600
| New | +$634K |
|
3487
PUT
PTC
PTC
$14.8B
| $669K | ﹤0.01% |
3,300
+3,200
| +3,200% | +$652K |
|
3488
CALL
Aspen Aerogels
ASPN
$363M
| $668K | ﹤0.01% |
96,000
-7,700
| -7% | -$54.3K |
|
3489
Vita Coco
COCO
$3.92B
| $668K | ﹤0.01% |
15,734
+14,329
| +1,020% | +$531K |
|
3490
PUT
Sonos
SONO
$1.95B
| $668K | ﹤0.01% |
42,300
+29,700
| +236% | +$381K |
|
3491
PUT
Dover
DOV
$27.3B
| $667K | ﹤0.01% |
4,000
-3,000
| -43% | -$538K |
|
3492
CALL
Broadridge
BR
$18.3B
| $666K | ﹤0.01% |
2,800
+2,000
| +250% | +$498K |
|
3493
PUT
DHT Holdings
DHT
$3B
| $666K | ﹤0.01% |
55,800
+3,900
| +8% | +$45.2K |
|
|
KC
3494
CALL
Kingsoft Cloud Holdings
KC
$3.02B
| $666K | ﹤0.01% |
44,700
-184,300
| -80% | -$2.67M |
|
3495
GraniteShares 2x Long TSLA Daily ETF
TSLR
$57.3M
| $666K | ﹤0.01% |
+19,600
| New | +$426K |
|
3496
CALL
MakeMyTrip
MMYT
$5.03B
| $664K | ﹤0.01% |
7,100
-16,400
| -70% | -$1.59M |
|
3497
A.O. Smith
AOS
$8.79B
| $663K | ﹤0.01% |
+9,032
| New | +$645K |
|
3498
Jack Henry & Associates
JKHY
$11.2B
| $661K | ﹤0.01% |
+4,444
| New | +$738K |
|
3499
CALL
Comfort Systems
FIX
$57.2B
| $660K | ﹤0.01% |
800
-3,200
| -80% | -$2.17M |
|
3500
Real Brokerage
REAX
$373M
| $660K | ﹤0.01% |
158,095
+151,288
| +2,223% | +$683K |
|
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.