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 | |
|---|---|---|---|---|---|---|
|
FITB
1476
PUT
Fifth Third Bancorp
FITB
$52B
| $4.91M | ﹤0.01% |
110,200
+17,500
| +19% | +$766K |
|
1477
Bloom Energy
BE
$52.6B
| $4.91M | ﹤0.01% |
58,043
-90,826
| -61% | -$4.22M |
|
1478
CALL
Scorpio Tankers
STNG
$3.96B
| $4.89M | ﹤0.01% |
87,300
-35,500
| -29% | -$1.75M |
|
1479
CALL
VICI Properties
VICI
$29.4B
| $4.89M | ﹤0.01% |
150,000
+39,100
| +35% | +$1.29M |
|
1480
PUT
Alexandria Real Estate Equities
ARE
$8.88B
| $4.88M | ﹤0.01% |
58,600
+4,100
| +8% | +$328K |
|
1481
CALL
BioNTech
BNTX
$22.6B
| $4.88M | ﹤0.01% |
49,500
+12,700
| +35% | +$1.36M |
|
1482
PUT
Banc of California
BANC
$3.28B
| $4.87M | ﹤0.01% |
294,200
+18,300
| +7% | +$287K |
|
1483
PUT
Vail Resorts
MTN
$5.19B
| $4.86M | ﹤0.01% |
32,500
+19,600
| +152% | +$3.04M |
|
1484
United States Oil Fund
USO
$2.45B
| $4.86M | ﹤0.01% |
+65,893
| New | +$4.95M |
|
1485
Canadian Pacific Kansas City
CP
$82B
| $4.86M | ﹤0.01% |
65,188
+10,711
| +20% | +$818K |
|
1486
PUT
Ares Capital
ARCC
$13.5B
| $4.85M | ﹤0.01% |
237,500
+36,500
| +18% | +$811K |
|
1487
CALL
United States Natural Gas Fund
UNG
$470M
| $4.84M | ﹤0.01% |
370,700
-65,000
| -15% | -$871K |
|
1488
PUT
ACM Research
ACMR
$5.83B
| $4.84M | ﹤0.01% |
123,800
-40,300
| -25% | -$1.2M |
|
1489
CALL
Calumet Specialty Products
CLMT
$3.63B
| $4.84M | ﹤0.01% |
265,100
+52,200
| +25% | +$859K |
|
|
BTC
1490
Grayscale Bitcoin Mini Trust ETF
BTC
$3.4B
| $4.83M | ﹤0.01% |
95,512
+12,824
| +16% | +$650K |
|
|
CIVI
1491
PUT
DELISTED
Civitas Resources
CIVI
| $4.82M | ﹤0.01% |
148,400
-24,300
| -14% | -$778K |
|
1492
CALL
Ionis Pharmaceuticals
IONS
$9.35B
| $4.82M | ﹤0.01% |
73,700
-10,900
| -13% | -$532K |
|
1493
CALL
Illumina
ILMN
$29.4B
| $4.81M | ﹤0.01% |
56,700
-46,500
| -45% | -$4.61M |
|
|
EH
1494
EHang Holdings
EH
$372M
| $4.8M | ﹤0.01% |
258,670
+152,379
| +143% | +$2.67M |
|
1495
Bank of Montreal
BMO
$125B
| $4.8M | ﹤0.01% |
+36,869
| New | +$4.37M |
|
1496
PUT
Samsara
IOT
$19.3B
| $4.8M | ﹤0.01% |
128,900
-178,600
| -58% | -$6.63M |
|
1497
PUT
Copart
CPRT
$25.9B
| $4.79M | ﹤0.01% |
106,600
+19,000
| +22% | +$895K |
|
1498
CALL
W.P. Carey
WPC
$17.1B
| $4.79M | ﹤0.01% |
71,200
+38,200
| +116% | +$2.5M |
|
1499
CALL
Frontline
FRO
$8.75B
| $4.79M | ﹤0.01% |
210,300
-168,100
| -44% | -$3.4M |
|
1500
CALL
Galicia Financial Group
GGAL
$7.92B
| $4.77M | ﹤0.01% |
173,200
+132,300
| +323% | +$5.68M |
|
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.