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 | |
|---|---|---|---|---|---|---|
5326
CALL
Genesco
GCO
$425M
| $144K | ﹤0.01% |
5,000
+4,900
| +4,900% | +$135K |
|
5327
Harmonic Inc
HLIT
$1.25B
| $144K | ﹤0.01% |
14,192
+12,531
| +754% | +$118K |
|
5328
SEALSQ Corp
LAES
$526M
| $144K | ﹤0.01% |
+38,702
| New | +$125K |
|
5329
CALL
La-Z-Boy
LZB
$1.58B
| $144K | ﹤0.01% |
4,200
+1,500
| +56% | +$55K |
|
|
NNDM
5330
CALL
Nano Dimension
NNDM
$324M
| $144K | ﹤0.01% |
92,200
+38,300
| +71% | +$55.9K |
|
5331
Quince Therapeutics
QNCX
$22.9M
| $144K | ﹤0.01% |
+443
| New | +$148K |
|
5332
CALL
Regenxbio
RGNX
$620M
| $144K | ﹤0.01% |
15,000
-12,200
| -45% | -$108K |
|
5333
PUT
Teucrium Agricultural Fund
TAGS
$18.8M
| $144K | ﹤0.01% |
17,100
-18,300
| -52% | -$435K |
|
|
WNS
5334
PUT
DELISTED
WNS Holdings
WNS
| $144K | ﹤0.01% |
1,900
-1,700
| -47% | -$127K |
|
5335
PUT
Freshworks
FRSH
$3.14B
| $143K | ﹤0.01% |
12,200
+11,200
| +1,120% | +$151K |
|
|
GDEN
5336
CALL
DELISTED
Golden Entertainment
GDEN
| $143K | ﹤0.01% |
6,100
-22,900
| -79% | -$610K |
|
5337
CALL
Milestone Pharmaceuticals
MIST
$138M
| $143K | ﹤0.01% |
71,800
-55,000
| -43% | -$96.7K |
|
5338
NET Power
NPWR
$126M
| $143K | ﹤0.01% |
47,571
+13,339
| +39% | +$35.6K |
|
|
PMT
5339
CALL
PennyMac Mortgage Investment
PMT
$822M
| $143K | ﹤0.01% |
11,700
-20,500
| -64% | -$253K |
|
5340
PUT
Trinity Industries
TRN
$2.49B
| $143K | ﹤0.01% |
+5,100
| New | +$141K |
|
5341
CALL
Universal Health Services
UHS
$10.2B
| $143K | ﹤0.01% |
700
-9,800
| -93% | -$1.76M |
|
5342
PUT
Usana Health Sciences
USNA
$408M
| $143K | ﹤0.01% |
5,200
+4,900
| +1,633% | +$151K |
|
5343
Vanguard Energy ETF
VDE
$10.1B
| $143K | ﹤0.01% |
+1,138
| New | +$140K |
|
5344
Vicor
VICR
$9.56B
| $143K | ﹤0.01% |
2,894
-3,457
| -54% | -$168K |
|
5345
CALL
Verastem
VSTM
$510M
| $143K | ﹤0.01% |
16,200
-7,900
| -33% | -$58.8K |
|
5346
Coca-Cola Consolidated
COKE
$12.5B
| $142K | ﹤0.01% |
1,216
+1,155
| +1,893% | +$134K |
|
5347
PUT
GrafTech
EAF
$175M
| $142K | ﹤0.01% |
11,100
+10,570
| +1,994% | +$122K |
|
5348
Direxion Daily NYSE FANG+ Bull 2X ETF
FNGG
$121M
| $142K | ﹤0.01% |
586
-3,436
| -85% | -$767K |
|
5349
Invesco
IVZ
$13.1B
| $142K | ﹤0.01% |
6,208
-14,744
| -70% | -$306K |
|
5350
CALL
Lazard
LAZ
$4.13B
| $142K | ﹤0.01% |
2,700
-2,000
| -43% | -$108K |
|
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.