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 | |
|---|---|---|---|---|---|---|
7351
Adecoagro
AGRO
$1.45B
| $19K | ﹤0.01% |
2,511
-71
| -3% | -$623 |
|
|
ALE
7352
PUT
DELISTED
Allete
ALE
| $19K | ﹤0.01% |
+300
| New | +$19.5K |
|
7353
Sphere 3D
ANY
$16.8M
| $19K | ﹤0.01% |
2,622
+1,757
| +203% | +$11K |
|
7354
JPMorgan BetaBuilders Japan ETF
BBJP
$17.1B
| $19K | ﹤0.01% |
+300
| New | +$19.2K |
|
|
CAN
7355
PUT
Canaan Creative
CAN
$178M
| $19K | ﹤0.01% |
22,100
+400
| +2% | +$304 |
|
7356
Celularity
CELU
$22M
| $19K | ﹤0.01% |
9,451
-7,953
| -46% | -$22.3K |
|
7357
PUT
Dimensional US Core Equity Market ETF
DFAU
$12.3B
| $19K | ﹤0.01% |
600
-400
| -40% | -$17.6K |
|
7358
iShares MSCI Poland ETF
EPOL
$674M
| $19K | ﹤0.01% |
611
-2,296
| -79% | -$74.7K |
|
7359
CALL
Evolent Health
EVH
$421M
| $19K | ﹤0.01% |
2,300
-15,700
| -87% | -$152K |
|
7360
CALL
Full House Resorts
FLL
$83.8M
| $19K | ﹤0.01% |
+6,200
| New | +$24.4K |
|
7361
CALL
Invesco CurrencyShares Australian Dollar Trust
FXA
$96.7M
| $19K | ﹤0.01% |
300
+100
| +50% | +$6.48K |
|
7362
GATX Corp
GATX
$6.6B
| $19K | ﹤0.01% |
+111
| New | +$18K |
|
7363
PUT
HCI Group
HCI
$2.29B
| $19K | ﹤0.01% |
100
-400
| -80% | -$63.3K |
|
7364
Intellicheck
IDN
$73.7M
| $19K | ﹤0.01% |
3,736
+2,041
| +120% | +$10.7K |
|
7365
PUT
Independence Realty Trust
IRT
$3.93B
| $19K | ﹤0.01% |
1,200
-100
| -8% | -$1.73K |
|
7366
CALL
Merchants Bancorp
MBIN
$2.24B
| $19K | ﹤0.01% |
600
+500
| +500% | +$16.4K |
|
7367
CALL
MDU Resources
MDU
$4.31B
| $19K | ﹤0.01% |
1,100
+400
| +57% | +$6.68K |
|
|
LITS
7368
Lite Strategy Inc
LITS
$33M
| $19K | ﹤0.01% |
+8,168
| New | +$33.7K |
|
|
MREO
7369
PUT
Mereo BioPharma
MREO
$49.4M
| $19K | ﹤0.01% |
9,400
-15,600
| -62% | -$28.8K |
|
7370
PUT
New Mountain Finance
NMFC
$668M
| $19K | ﹤0.01% |
2,000
| – | – |
|
7371
PUT
Insperity
NSP
$2.01B
| $19K | ﹤0.01% |
400
+300
| +300% | +$16.4K |
|
7372
Navigator Holdings
NVGS
$1.34B
| $19K | ﹤0.01% |
1,254
-3,270
| -72% | -$52.2K |
|
|
NXDT
7373
CALL
NexPoint Diversified Real Estate Trust
NXDT
$276M
| $19K | ﹤0.01% |
5,200
+3,300
| +174% | +$14K |
|
7374
CALL
Nexstar Media Group
NXST
$5.92B
| $19K | ﹤0.01% |
100
-800
| -89% | -$156K |
|
7375
CALL
Outset Medical
OM
$87.5M
| $19K | ﹤0.01% |
1,400
-6,200
| -82% | -$96.7K |
|
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.