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 | |
|---|---|---|---|---|---|---|
2526
CALL
McCormick & Company Non-Voting
MKC
$13.4B
| $1.63M | ﹤0.01% |
24,400
-7,500
| -24% | -$525K |
|
|
XRN
2527
PUT
Chiron Real Estate Inc
XRN
$544M
| $1.63M | ﹤0.01% |
48,400
+47,880
| +9,208% | +$1.7M |
|
2528
Kyndryl
KD
$2.66B
| $1.63M | ﹤0.01% |
54,282
-4,516
| -8% | -$155K |
|
|
NVMI
2529
PUT
Nova
NVMI
$13.9B
| $1.63M | ﹤0.01% |
5,100
-6,300
| -55% | -$1.74M |
|
|
CMBT
2530
PUT
CMB.TECH NV
CMBT
$4.57B
| $1.63M | ﹤0.01% |
173,600
+173,400
| +86,700% | +$1.59M |
|
|
ETOR
2531
PUT
eToro Group
ETOR
$2.93B
| $1.63M | ﹤0.01% |
39,500
-5,100
| -11% | -$263K |
|
2532
PUT
Kanzhun
BZ
$6.89B
| $1.63M | ﹤0.01% |
69,600
-3,100
| -4% | -$66.5K |
|
2533
CALL
Cabaletta Bio
CABA
$439M
| $1.62M | ﹤0.01% |
693,700
+338,000
| +95% | +$580K |
|
2534
Cintas
CTAS
$82.4B
| $1.62M | ﹤0.01% |
7,905
+3,569
| +82% | +$762K |
|
2535
CALL
AvePoint
AVPT
$2.6B
| $1.62M | ﹤0.01% |
108,000
+34,600
| +47% | +$581K |
|
2536
PUT
Sunoco
SUN
$14.2B
| $1.62M | ﹤0.01% |
32,400
+27,100
| +511% | +$1.41M |
|
2537
CALL
Elanco Animal Health
ELAN
$12.4B
| $1.62M | ﹤0.01% |
80,400
+1,000
| +1% | +$16.8K |
|
2538
Evolv Technologies
EVLV
$943M
| $1.62M | ﹤0.01% |
214,257
+27,123
| +14% | +$198K |
|
2539
CALL
Guidewire Software
GWRE
$11.5B
| $1.61M | ﹤0.01% |
7,000
-200
| -3% | -$45.5K |
|
2540
PUT
abrdn Physical Palladium Shares ETF
PALL
$603M
| $1.61M | ﹤0.01% |
70,500
-11,000
| -13% | -$235K |
|
2541
CALL
Aaon
AAON
$8.41B
| $1.61M | ﹤0.01% |
17,200
+9,600
| +126% | +$786K |
|
2542
CALL
Labcorp
LH
$24.3B
| $1.61M | ﹤0.01% |
5,600
+4,000
| +250% | +$1.07M |
|
2543
CALL
Merit Medical Systems
MMSI
$4.43B
| $1.61M | ﹤0.01% |
19,300
+14,800
| +329% | +$1.29M |
|
2544
PUT
Kodak
KODK
$806M
| $1.6M | ﹤0.01% |
250,500
-328,400
| -57% | -$2.07M |
|
2545
PUT
Sundial Growers
SNDL
$325M
| $1.6M | ﹤0.01% |
599,000
+45,400
| +8% | +$91.1K |
|
2546
PUT
Sysco
SYY
$39.7B
| $1.6M | ﹤0.01% |
19,500
-3,400
| -15% | -$272K |
|
2547
CALL
AbCellera Biologics
ABCL
$1.62B
| $1.6M | ﹤0.01% |
318,700
-96,100
| -23% | -$424K |
|
2548
CALL
News Corp Class B
NWS
$16.4B
| $1.6M | ﹤0.01% |
52,100
-58,500
| -53% | -$1.98M |
|
2549
PUT
Herbalife
HLF
$1.23B
| $1.6M | ﹤0.01% |
189,900
+131,200
| +224% | +$1.24M |
|
2550
Tenet Healthcare
THC
$20.1B
| $1.6M | ﹤0.01% |
7,890
-7,220
| -48% | -$1.28M |
|
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.