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 | |
|---|---|---|---|---|---|---|
4251
Tiptree Inc
TIPT
$694M
| $357K | ﹤0.01% |
18,632
+6,408
| +52% | +$143K |
|
4252
3D Systems Corp
DDD
$405M
| $356K | ﹤0.01% |
+122,956
| New | +$253K |
|
4253
PUT
Hudbay
HBM
$9.76B
| $356K | ﹤0.01% |
23,500
+17,200
| +273% | +$197K |
|
4254
PUT
Pegasystems
PEGA
$5.09B
| $356K | ﹤0.01% |
6,200
-62,800
| -91% | -$3.46M |
|
4255
CAE Inc. Common Shares
CAE
$8.44B
| $355K | ﹤0.01% |
11,982
-1,963
| -14% | -$55.2K |
|
4256
PUT
Chegg
CHGG
$116M
| $355K | ﹤0.01% |
235,400
+203,700
| +643% | +$286K |
|
4257
PUT
Turning Point Brands
TPB
$1.48B
| $355K | ﹤0.01% |
3,600
+3,500
| +3,500% | +$317K |
|
4258
Entergy
ETR
$50.3B
| $354K | ﹤0.01% |
+3,801
| New | +$334K |
|
4259
First Watch Restaurant Group
FWRG
$814M
| $354K | ﹤0.01% |
22,637
+8,630
| +62% | +$150K |
|
4260
PUT
ImmunityBio
IBRX
$7.15B
| $354K | ﹤0.01% |
144,100
-191,700
| -57% | -$494K |
|
4261
PUT
Abeona Therapeutics
ABEO
$355M
| $353K | ﹤0.01% |
66,900
+31,400
| +88% | +$199K |
|
4262
PUT
MINISO
MNSO
$3.88B
| $353K | ﹤0.01% |
15,700
-2,700
| -15% | -$57.7K |
|
4263
CALL
RPM International
RPM
$13.8B
| $353K | ﹤0.01% |
3,000
-4,900
| -62% | -$588K |
|
4264
CALL
Sagimet Biosciences
SGMT
$435M
| $353K | ﹤0.01% |
51,500
-12,800
| -20% | -$104K |
|
4265
Emcor
EME
$29.9B
| $352K | ﹤0.01% |
543
-596
| -52% | -$362K |
|
4266
CALL
EyePoint Inc
EYPT
$999M
| $351K | ﹤0.01% |
24,700
-12,000
| -33% | -$138K |
|
|
XOVR
4267
EntrepreneurShares Series Trust ERShares Private-Public Crossover ETF
XOVR
$1.76B
| $351K | ﹤0.01% |
16,639
+10,524
| +172% | +$210K |
|
4268
iQIYI
IQ
$1.19B
| $350K | ﹤0.01% |
+136,982
| New | +$303K |
|
|
LTC
4269
CALL
LTC Properties
LTC
$2.13B
| $350K | ﹤0.01% |
9,500
+400
| +4% | +$14.3K |
|
4270
CALL
Oshkosh
OSK
$8.91B
| $350K | ﹤0.01% |
2,700
+1,800
| +200% | +$239K |
|
4271
CALL
ARS Pharmaceuticals
SPRY
$579M
| $350K | ﹤0.01% |
34,900
+18,900
| +118% | +$271K |
|
4272
PUT
Ameresco
AMRC
$980M
| $349K | ﹤0.01% |
10,400
-2,300
| -18% | -$52.6K |
|
4273
CALL
Ardelyx
ARDX
$1.24B
| $349K | ﹤0.01% |
63,400
+12,800
| +25% | +$69.5K |
|
4274
PUT
Cooper Companies
COO
$14.2B
| $349K | ﹤0.01% |
5,100
+2,900
| +132% | +$205K |
|
4275
PUT
Cheniere Energy
CQP
$30.5B
| $349K | ﹤0.01% |
6,500
+4,300
| +195% | +$234K |
|
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.