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 | |
|---|---|---|---|---|---|---|
4276
Thor Industries
THO
$4.06B
| $349K | ﹤0.01% |
+3,373
| New | +$340K |
|
|
VOYG
4277
CALL
Voyager Technologies
VOYG
$1.34B
| $348K | ﹤0.01% |
11,700
-8,600
| -42% | -$297K |
|
|
KLAR
4278
CALL
Klarna Group
KLAR
$7.04B
| $348K | ﹤0.01% |
+9,500
| New | +$407K |
|
4279
Beam Therapeutics
BEAM
$2.68B
| $347K | ﹤0.01% |
14,332
-42,238
| -75% | -$840K |
|
4280
CALL
FNB Corp
FNB
$6.76B
| $347K | ﹤0.01% |
21,600
+6,800
| +46% | +$108K |
|
4281
CALL
Helen of Troy
HELE
$656M
| $347K | ﹤0.01% |
13,800
-4,400
| -24% | -$107K |
|
4282
CALL
Corvus Pharmaceuticals
CRVS
$1.1B
| $346K | ﹤0.01% |
47,000
+19,700
| +72% | +$101K |
|
4283
PUT
Fidelity Enhanced Large Cap Core ETF
FELC
$7.78B
| $346K | ﹤0.01% |
6,000
+5,800
| +2,900% | +$207K |
|
|
IPG
4284
CALL
DELISTED
Interpublic Group of Companies
IPG
| $346K | ﹤0.01% |
12,400
-4,000
| -24% | -$103K |
|
|
TBCH
4285
Turtle Beach Corp
TBCH
$238M
| $346K | ﹤0.01% |
21,769
-17,024
| -44% | -$253K |
|
4286
CALL
Fortrea Holdings
FTRE
$1.93B
| $345K | ﹤0.01% |
41,000
+11,300
| +38% | +$86.5K |
|
4287
Hercules Capital
HTGC
$2.99B
| $345K | ﹤0.01% |
18,276
+680
| +4% | +$13K |
|
4288
CALL
Matsons
MATX
$6.11B
| $345K | ﹤0.01% |
3,500
+1,500
| +75% | +$160K |
|
4289
Tronox
TROX
$967M
| $345K | ﹤0.01% |
85,989
+54,426
| +172% | +$249K |
|
4290
CBRE Group
CBRE
$43.3B
| $344K | ﹤0.01% |
+2,187
| New | +$338K |
|
4291
PUT
Guidewire Software
GWRE
$13.9B
| $344K | ﹤0.01% |
1,500
-2,700
| -64% | -$614K |
|
4292
CALL
Radian Group
RDN
$5.28B
| $344K | ﹤0.01% |
9,500
-300
| -3% | -$10.4K |
|
|
TWO
4293
CALL
Two Harbors Investment
TWO
$1.27B
| $344K | ﹤0.01% |
34,900
-79,800
| -70% | -$804K |
|
4294
Ginkgo Bioworks
DNA
$498M
| $343K | ﹤0.01% |
+23,533
| New | +$282K |
|
4295
CALL
Warrior Met Coal
HCC
$4.17B
| $343K | ﹤0.01% |
5,400
-600
| -10% | -$34.3K |
|
4296
CALL
O-I Glass
OI
$1.18B
| $343K | ﹤0.01% |
26,500
-2,500
| -9% | -$34.1K |
|
4297
PUT
Twist Bioscience
TWST
$5.32B
| $343K | ﹤0.01% |
12,200
+800
| +7% | +$24.2K |
|
|
CNH
4298
PUT
CNH Industrial
CNH
$13.3B
| $343K | ﹤0.01% |
31,700
-90,900
| -74% | -$1.11M |
|
4299
AbCellera Biologics
ABCL
$1.65B
| $342K | ﹤0.01% |
+68,077
| New | +$300K |
|
4300
Knight Transportation
KNX
$11.5B
| $342K | ﹤0.01% |
8,661
+5,924
| +216% | +$257K |
|
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.