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 | |
|---|---|---|---|---|---|---|
276
PUT
McDonald's
MCD
$187B
| $67.8M | 0.03% |
252,000
+48,300
| +24% | +$14.7M |
|
277
Iris Energy
IREN
$14.8B
| $67.7M | 0.03% |
1,442,599
+60,473
| +4% | +$1.47M |
|
|
OKLO
278
CALL
Oklo
OKLO
$7.74B
| $67.4M | 0.03% |
603,900
-192,800
| -24% | -$15.1M |
|
279
PUT
GE Aerospace
GE
$354B
| $67.3M | 0.03% |
230,400
-199,000
| -46% | -$54.4M |
|
280
CALL
Delta Air Lines
DAL
$54.9B
| $67.2M | 0.03% |
1,183,800
+453,600
| +62% | +$25.9M |
|
281
CALL
Spotify
SPOT
$97.5B
| $67M | 0.03% |
96,000
+14,100
| +17% | +$9.86M |
|
282
PUT
AutoZone
AZO
$48.5B
| $66.9M | 0.03% |
15,600
+14,600
| +1,460% | +$58.6M |
|
283
PUT
PepsiCo
PEP
$185B
| $66.2M | 0.03% |
555,600
-463,900
| -46% | -$66.2M |
|
|
284
Alphabet (Google) Class A
GOOGL
$4.17T
| $65.9M | 0.03% |
270,975
-443,553
| -62% | -$92.9M |
|
285
PUT
United Parcel Service
UPS
$98.5B
| $65.2M | 0.03% |
780,400
+484,400
| +164% | +$43.9M |
|
286
CALL
Verizon
VZ
$185B
| $64.9M | 0.03% |
1,477,600
-1,326,900
| -47% | -$57.4M |
|
|
BMNR
287
PUT
BitMine Immersion Technologies
BMNR
$10.7B
| $64.8M | 0.03% |
+1,247,300
| New | +$63.2M |
|
288
CALL
CVS Health
CVS
$138B
| $64.5M | 0.03% |
855,200
-469,900
| -35% | -$32.2M |
|
289
PUT
American Airlines Group
AAL
$9.78B
| $63.8M | 0.03% |
5,674,000
-588,500
| -9% | -$7.25M |
|
|
TEM
290
CALL
Tempus AI
TEM
$8.43B
| $63.4M | 0.03% |
785,800
+5,000
| +0.6% | +$350K |
|
291
CALL
Sea Limited
SE
$64.2B
| $63.3M | 0.03% |
354,100
-80,700
| -19% | -$13.8M |
|
292
CALL
Western Digital
WDC
$192B
| $63.2M | 0.03% |
687,800
+197,700
| +40% | +$16.2M |
|
293
CALL
Unity
U
$12.8B
| $63M | 0.03% |
1,574,000
+323,600
| +26% | +$12M |
|
294
CALL
Rocket Companies
RKT
$38B
| $62.6M | 0.03% |
3,230,400
+2,002,400
| +163% | +$34.9M |
|
295
CALL
Bristol-Myers Squibb
BMY
$124B
| $62.5M | 0.03% |
1,386,100
+521,800
| +60% | +$24.4M |
|
296
CALL
GraniteShares Bloomberg Commodity Broad Strategy No K-1 ETF
COMB
$135M
| $62.2M | 0.03% |
946,700
-177,100
| -16% | -$3.76M |
|
297
PUT
Futu Holdings
FUTU
$14.9B
| $62.1M | 0.03% |
357,100
+158,700
| +80% | +$26.4M |
|
298
PUT
ServiceNow
NOW
$98.4B
| $61.8M | 0.03% |
336,000
-25,500
| -7% | -$4.76M |
|
299
CALL
State Street SPDR S&P MIDCAP 400 ETF Trust
MDY
$27B
| $61.7M | 0.03% |
103,500
+43,600
| +73% | +$25.6M |
|
300
CALL
Capital One
COF
$124B
| $61.6M | 0.03% |
289,700
+154,800
| +115% | +$33.9M |
|
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.