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 | |
|---|---|---|---|---|---|---|
3426
CALL
Kaspi.kz JSC
KSPI
$16.5B
| $702K | ﹤0.01% |
8,600
+8,000
| +1,333% | +$701K |
|
3427
PUT
TE Connectivity
TEL
$60.8B
| $702K | ﹤0.01% |
3,200
-4,800
| -60% | -$962K |
|
3428
PUT
Ericsson
ERIC
$32.6B
| $699K | ﹤0.01% |
84,600
+8,400
| +11% | +$65.7K |
|
|
JKS
3429
CALL
JinkoSolar
JKS
$783M
| $699K | ﹤0.01% |
29,100
-21,200
| -42% | -$500K |
|
|
SRG
3430
CALL
Seritage Growth Properties
SRG
$131M
| $699K | ﹤0.01% |
164,500
+163,400
| +14,855% | +$571K |
|
3431
CALL
Western Midstream Partners
WES
$19.5B
| $699K | ﹤0.01% |
17,800
-10,300
| -37% | -$402K |
|
3432
PUT
Blend Labs
BLND
$436M
| $698K | ﹤0.01% |
191,500
+189,300
| +8,605% | +$680K |
|
|
ONT
3433
PUT
Onterris Inc
ONT
$739M
| $697K | ﹤0.01% |
25,400
-9,000
| -26% | -$235K |
|
3434
C3.ai
AI
$1.43B
| $696K | ﹤0.01% |
40,180
-161,719
| -80% | -$3.38M |
|
3435
Invesco Mortgage Capital
IVR
$768M
| $696K | ﹤0.01% |
92,188
+56,663
| +160% | +$432K |
|
3436
Larimar Therapeutics
LRMR
$393M
| $695K | ﹤0.01% |
215,462
+75,038
| +53% | +$281K |
|
3437
PUT
Simplify US Equity PLUS Convexity ETF
SPYC
$112M
| $694K | ﹤0.01% |
37,600
+2,900
| +8% | +$121K |
|
3438
PUT
Brookfield Infrastructure Partners
BIP
$19B
| $693K | ﹤0.01% |
21,100
+19,000
| +905% | +$598K |
|
3439
PUT
Helmerich & Payne
HP
$3.29B
| $693K | ﹤0.01% |
31,400
-23,600
| -43% | -$435K |
|
3440
PUT
Century Aluminum
CENX
$4.4B
| $692K | ﹤0.01% |
23,600
-57,400
| -71% | -$1.3M |
|
|
CMPS
3441
Compass Pathways
CMPS
$1.46B
| $692K | ﹤0.01% |
120,888
-62,143
| -34% | -$279K |
|
3442
PUT
Energy Vault
NRGV
$498M
| $691K | ﹤0.01% |
+232,900
| New | +$382K |
|
3443
CALL
EPR Properties
EPR
$4.91B
| $690K | ﹤0.01% |
11,900
-9,400
| -44% | -$528K |
|
3444
PUT
Mineralys Therapeutics
MLYS
$2.36B
| $690K | ﹤0.01% |
+18,200
| New | +$394K |
|
3445
Arqit Quantum
ARQQ
$313M
| $689K | ﹤0.01% |
17,793
+17,492
| +5,811% | +$606K |
|
3446
Eversource Energy
ES
$28.7B
| $689K | ﹤0.01% |
9,691
+1,035
| +12% | +$67.9K |
|
3447
Boston Properties
BXP
$11B
| $688K | ﹤0.01% |
9,257
-3,498
| -27% | -$247K |
|
3448
PUT
ClearPoint Neuro
CLPT
$432M
| $688K | ﹤0.01% |
31,600
+31,300
| +10,433% | +$369K |
|
|
INFA
3449
PUT
DELISTED
Informatica
INFA
| $688K | ﹤0.01% |
27,700
-2,600
| -9% | -$64.1K |
|
3450
CALL
Mattel
MAT
$4.47B
| $688K | ﹤0.01% |
40,900
-19,700
| -33% | -$359K |
|
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.