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 | |
|---|---|---|---|---|---|---|
|
NUVL
5301
DELISTED
Nuvalent
NUVL
| $147K | ﹤0.01% |
1,709
-16,021
| -90% | -$1.27M |
|
|
ADAM
5302
CALL
Adamas Trust
ADAM
$815M
| $147K | ﹤0.01% |
21,200
+6,700
| +46% | +$46.6K |
|
5303
Sabesp
SBS
$19.1B
| $147K | ﹤0.01% |
30,661
-67,194
| -69% | -$283K |
|
5304
CALL
TD Synnex
SNX
$20.4B
| $147K | ﹤0.01% |
900
+300
| +50% | +$44.2K |
|
|
KLC
5305
KinderCare Learning Companies
KLC
$634M
| $147K | ﹤0.01% |
22,148
-16,018
| -42% | -$134K |
|
5306
CALL
Gain Therapeutics
GANX
$71.7M
| $146K | ﹤0.01% |
+82,700
| New | +$140K |
|
5307
PUT
Glacier Bancorp
GBCI
$6.42B
| $146K | ﹤0.01% |
3,000
+2,900
| +2,900% | +$136K |
|
5308
CALL
Kura Oncology
KURA
$800M
| $146K | ﹤0.01% |
16,600
+15,600
| +1,560% | +$111K |
|
5309
CALL
LifeMD
LFMD
$169M
| $146K | ﹤0.01% |
21,600
-39,600
| -65% | -$327K |
|
5310
National CineMedia
NCMI
$376M
| $146K | ﹤0.01% |
+32,580
| New | +$152K |
|
5311
CALL
Nu Skin
NUS
$252M
| $146K | ﹤0.01% |
12,000
+11,700
| +3,900% | +$123K |
|
|
PVBC
5312
CALL
DELISTED
Provident Bancorp
PVBC
| $146K | ﹤0.01% |
+11,700
| New | +$148K |
|
|
ZEPP
5313
CALL
Zepp Health
ZEPP
$66.4M
| $146K | ﹤0.01% |
+3,200
| New | +$96.9K |
|
|
SLDE
5314
PUT
Slide Insurance Holdings
SLDE
$2.31B
| $146K | ﹤0.01% |
+9,300
| New | +$152K |
|
5315
PUT
Compañía de Minas Buenaventura
BVN
$7.69B
| $145K | ﹤0.01% |
6,000
+5,700
| +1,900% | +$107K |
|
5316
CALL
MYR Group
MYRG
$5.19B
| $145K | ﹤0.01% |
700
+500
| +250% | +$93.3K |
|
5317
Newmark Group
NMRK
$2.66B
| $145K | ﹤0.01% |
7,789
+6,493
| +501% | +$105K |
|
5318
PUT
UDR
UDR
$12.3B
| $145K | ﹤0.01% |
3,900
+3,800
| +3,800% | +$148K |
|
5319
CALL
Alkami Technology
ALKT
$1.94B
| $144K | ﹤0.01% |
+5,800
| New | +$148K |
|
|
EFOR
5320
Everforth Inc
EFOR
$1.17B
| $144K | ﹤0.01% |
3,043
+2,961
| +3,611% | +$151K |
|
5321
CALL
B&G Foods
BGS
$287M
| $144K | ﹤0.01% |
32,600
+2,200
| +7% | +$9.61K |
|
5322
PUT
Clarivate
CLVT
$1.27B
| $144K | ﹤0.01% |
37,800
| – | – |
|
5323
PUT
Vita Coco
COCO
$3.82B
| $144K | ﹤0.01% |
3,400
+2,000
| +143% | +$74.2K |
|
5324
PUT
Fortune Brands Innovations
FBIN
$5.88B
| $144K | ﹤0.01% |
2,700
+1,700
| +170% | +$95.9K |
|
|
GAMB
5325
DELISTED
Gambling.com
GAMB
| $144K | ﹤0.01% |
17,620
+2,326
| +15% | +$22.5K |
|
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.